Re: [moderation/CI] Re: ipv6: anycast: insert aca into global hash under idev->lock
Aleksandr Nogikh <[email protected]>
| Newsgroups | dev.linux.lists.syzbot |
|---|---|
| Message-ID | <CANp29Y6tD7cHt16uTswREHNktFxNhRue8Rtp2+knxG55coycPg@mail.gmail.com> |
#syz upstream On Fri, May 29, 2026 at 10:18 AM syzbot ci <[email protected]> wrote: > > syzbot ci has tested the following series > > [v1] ipv6: anycast: insert aca into global hash under idev->lock > https://lore.kernel.org/all/[email protected] > * [PATCH net] ipv6: anycast: insert aca into global hash under idev->lock > > and found the following issues: > * possible deadlock in __ipv6_dev_ac_dec > * possible deadlock in addrconf_rs_timer > > Full report is available here: > https://ci.syzbot.org/series/00cb20f0-c599-468e-b3de-b109499c1db5 > > *** > > possible deadlock in __ipv6_dev_ac_dec > > tree: net > URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net.git > base: ab4ac5a93b1b76aa6b12cadcba30450868d21a6f > arch: amd64 > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > config: https://ci.syzbot.org/builds/9ba0a1a3-43c2-4334-8f26-942c72690313/config > syz repro: https://ci.syzbot.org/findings/54a509b9-82dc-4a61-a5c4-701533f277d6/syz_repro > > ======================================================== > WARNING: possible irq lock inversion dependency detected > syzkaller #0 Not tainted > -------------------------------------------------------- > syz.2.19/5872 just changed the state of lock: > ffffffff8fef3d98 (acaddr_hash_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:342 [inline] > ffffffff8fef3d98 (acaddr_hash_lock){+.+.}-{3:3}, at: ipv6_del_acaddr_hash net/ipv6/anycast.c:253 [inline] > ffffffff8fef3d98 (acaddr_hash_lock){+.+.}-{3:3}, at: __ipv6_dev_ac_dec+0x459/0x690 net/ipv6/anycast.c:419 > but this lock was taken by another, SOFTIRQ-safe lock in the past: > (&ndev->lock){++--}-{3:3} > > > and interrupts could create inverse lock ordering between them. > > > other info that might help us debug this: > Possible interrupt unsafe locking scenario: > > CPU0 CPU1 > ---- ---- > lock(acaddr_hash_lock > ); > local_irq_disable(); > lock(&ndev->lock); > lock(acaddr_hash_lock); > <Interrupt> > lock(&ndev->lock); > > *** DEADLOCK *** > > 1 lock held by syz.2.19/5872: > #0: ffff8881b52abe40 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4} > , at: inode_lock include/linux/fs.h:1029 [inline] > , at: __sock_release net/socket.c:721 [inline] > , at: sock_close+0x9b/0x240 net/socket.c:1514 > > the shortest dependencies between 2nd lock and 1st lock: > -> (&ndev->lock){++--}-{3:3} { > HARDIRQ-ON-W at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_write_lock_bh include/linux/rwlock_api_smp.h:221 [inline] > _raw_write_lock_bh+0x36/0x50 kernel/locking/spinlock.c:338 > addrconf_permanent_addr+0x16a/0xa20 net/ipv6/addrconf.c:3627 > addrconf_notify+0x864/0x1050 net/ipv6/addrconf.c:3706 > notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85 > call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] > call_netdevice_notifiers net/core/dev.c:2301 [inline] > __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9797 > netif_change_flags+0xe8/0x1a0 net/core/dev.c:9826 > dev_change_flags+0x130/0x270 net/core/dev_api.c:68 > devinet_ioctl+0x9f2/0x1b30 net/ipv4/devinet.c:1199 > inet_ioctl+0x42a/0x560 net/ipv4/af_inet.c:1011 > sock_do_ioctl+0x101/0x320 net/socket.c:1313 > sock_ioctl+0x5c6/0x7f0 net/socket.c:1434 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:597 [inline] > __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > HARDIRQ-ON-R at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_read_lock_bh include/linux/rwlock_api_smp.h:192 [inline] > _raw_read_lock_bh+0x3e/0x50 kernel/locking/spinlock.c:256 > inet6_fill_ifla6_attrs+0x1117/0x25e0 net/ipv6/addrconf.c:5858 > inet6_fill_link_af+0x9b/0x120 net/ipv6/addrconf.c:5893 > rtnl_fill_link_af+0x1c8/0x440 net/core/rtnetlink.c:1919 > rtnl_fill_ifinfo+0x1e08/0x20f0 net/core/rtnetlink.c:2190 > rtmsg_ifinfo_build_skb+0x17d/0x260 net/core/rtnetlink.c:4454 > rtmsg_ifinfo_event net/core/rtnetlink.c:4487 [inline] > rtmsg_ifinfo+0x8c/0x1a0 net/core/rtnetlink.c:4496 > register_netdevice+0x1aca/0x1ec0 net/core/dev.c:11475 > register_netdev+0x40/0x60 net/core/dev.c:11539 > vti6_init_net+0x238/0x370 net/ipv6/ip6_vti.c:1167 > ops_init+0x35c/0x5c0 net/core/net_namespace.c:137 > __register_pernet_operations net/core/net_namespace.c:1318 [inline] > register_pernet_operations+0x343/0x830 net/core/net_namespace.c:1395 > register_pernet_device+0x2a/0x80 net/core/net_namespace.c:1482 > vti6_tunnel_init+0x13/0x170 net/ipv6/ip6_vti.c:1251 > do_one_initcall+0x250/0x870 init/main.c:1392 > do_initcall_level+0x104/0x190 init/main.c:1454 > do_initcalls+0x59/0xa0 init/main.c:1470 > kernel_init_freeable+0x2a6/0x3e0 init/main.c:1703 > kernel_init+0x1d/0x1d0 init/main.c:1593 > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > IN-SOFTIRQ-W at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_write_lock include/linux/rwlock_api_smp.h:229 [inline] > _raw_write_lock+0x2e/0x40 kernel/locking/spinlock.c:304 > addrconf_rs_timer+0xc8/0x6d0 net/ipv6/addrconf.c:4033 > call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748 > expire_timers kernel/time/timer.c:1799 [inline] > __run_timers kernel/time/timer.c:2374 [inline] > __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386 > run_timer_base kernel/time/timer.c:2395 [inline] > run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405 > handle_softirqs+0x22a/0x840 kernel/softirq.c:622 > __do_softirq kernel/softirq.c:656 [inline] > invoke_softirq kernel/softirq.c:496 [inline] > __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 > irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 > instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] > sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061 > asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 > native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] > pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:62 > arch_safe_halt arch/x86/kernel/process.c:766 [inline] > default_idle+0x9/0x20 arch/x86/kernel/process.c:767 > default_idle_call+0x72/0xb0 kernel/sched/idle.c:122 > cpuidle_idle_call kernel/sched/idle.c:199 [inline] > do_idle+0x36a/0x5f0 kernel/sched/idle.c:352 > cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:451 > start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312 > common_startup_64+0x13e/0x147 > IN-SOFTIRQ-R at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_read_lock_bh include/linux/rwlock_api_smp.h:192 [inline] > _raw_read_lock_bh+0x3e/0x50 kernel/locking/spinlock.c:256 > ipv6_get_lladdr+0x15d/0x3f0 net/ipv6/addrconf.c:1940 > addrconf_rs_timer+0x337/0x6d0 net/ipv6/addrconf.c:4048 > call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748 > expire_timers kernel/time/timer.c:1799 [inline] > __run_timers kernel/time/timer.c:2374 [inline] > __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386 > run_timer_base kernel/time/timer.c:2395 [inline] > run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405 > handle_softirqs+0x22a/0x840 kernel/softirq.c:622 > __do_softirq kernel/softirq.c:656 [inline] > invoke_softirq kernel/softirq.c:496 [inline] > __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 > irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 > instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] > sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061 > asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 > native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] > pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:62 > arch_safe_halt arch/x86/kernel/process.c:766 [inline] > default_idle+0x9/0x20 arch/x86/kernel/process.c:767 > default_idle_call+0x72/0xb0 kernel/sched/idle.c:122 > cpuidle_idle_call kernel/sched/idle.c:199 [inline] > do_idle+0x36a/0x5f0 kernel/sched/idle.c:352 > cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:451 > start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312 > common_startup_64+0x13e/0x147 > INITIAL USE at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_write_lock_bh include/linux/rwlock_api_smp.h:221 [inline] > _raw_write_lock_bh+0x36/0x50 kernel/locking/spinlock.c:338 > addrconf_permanent_addr+0x16a/0xa20 net/ipv6/addrconf.c:3627 > addrconf_notify+0x864/0x1050 net/ipv6/addrconf.c:3706 > notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85 > call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] > call_netdevice_notifiers net/core/dev.c:2301 [inline] > __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9797 > netif_change_flags+0xe8/0x1a0 net/core/dev.c:9826 > dev_change_flags+0x130/0x270 net/core/dev_api.c:68 > devinet_ioctl+0x9f2/0x1b30 net/ipv4/devinet.c:1199 > inet_ioctl+0x42a/0x560 net/ipv4/af_inet.c:1011 > sock_do_ioctl+0x101/0x320 net/socket.c:1313 > sock_ioctl+0x5c6/0x7f0 net/socket.c:1434 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:597 [inline] > __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > INITIAL READ USE at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_read_lock_bh include/linux/rwlock_api_smp.h:192 [inline] > _raw_read_lock_bh+0x3e/0x50 kernel/locking/spinlock.c:256 > inet6_fill_ifla6_attrs+0x1117/0x25e0 net/ipv6/addrconf.c:5858 > inet6_fill_link_af+0x9b/0x120 net/ipv6/addrconf.c:5893 > rtnl_fill_link_af+0x1c8/0x440 net/core/rtnetlink.c:1919 > rtnl_fill_ifinfo+0x1e08/0x20f0 net/core/rtnetlink.c:2190 > rtmsg_ifinfo_build_skb+0x17d/0x260 net/core/rtnetlink.c:4454 > rtmsg_ifinfo_event net/core/rtnetlink.c:4487 [inline] > rtmsg_ifinfo+0x8c/0x1a0 net/core/rtnetlink.c:4496 > register_netdevice+0x1aca/0x1ec0 net/core/dev.c:11475 > register_netdev+0x40/0x60 net/core/dev.c:11539 > vti6_init_net+0x238/0x370 net/ipv6/ip6_vti.c:1167 > ops_init+0x35c/0x5c0 net/core/net_namespace.c:137 > __register_pernet_operations net/core/net_namespace.c:1318 [inline] > register_pernet_operations+0x343/0x830 net/core/net_namespace.c:1395 > register_pernet_device+0x2a/0x80 net/core/net_namespace.c:1482 > vti6_tunnel_init+0x13/0x170 net/ipv6/ip6_vti.c:1251 > do_one_initcall+0x250/0x870 init/main.c:1392 > do_initcall_level+0x104/0x190 init/main.c:1454 > do_initcalls+0x59/0xa0 init/main.c:1470 > kernel_init_freeable+0x2a6/0x3e0 init/main.c:1703 > kernel_init+0x1d/0x1d0 init/main.c:1593 > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > } > ... key at: [<ffffffff9a982fe0>] ipv6_add_dev.__key+0x0/0x20 > ... acquired at: > __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] > _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 > spin_lock include/linux/spinlock.h:342 [inline] > ipv6_add_acaddr_hash net/ipv6/anycast.c:246 [inline] > __ipv6_dev_ac_inc+0x6c8/0xb10 net/ipv6/anycast.c:374 > ipv6_sock_ac_join+0x6a8/0x880 net/ipv6/anycast.c:153 > do_ipv6_setsockopt+0x203a/0x3150 net/ipv6/ipv6_sockglue.c:893 > ipv6_setsockopt+0x59/0x170 net/ipv6/ipv6_sockglue.c:965 > do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2381 > __sys_setsockopt net/socket.c:2406 [inline] > __do_sys_setsockopt net/socket.c:2412 [inline] > __se_sys_setsockopt net/socket.c:2409 [inline] > __x64_sys_setsockopt+0x13d/0x1b0 net/socket.c:2409 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > -> (acaddr_hash_lock){+.+.}-{3:3} { > HARDIRQ-ON-W at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] > _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 > spin_lock include/linux/spinlock.h:342 [inline] > ipv6_add_acaddr_hash net/ipv6/anycast.c:246 [inline] > __ipv6_dev_ac_inc+0x6c8/0xb10 net/ipv6/anycast.c:374 > ipv6_sock_ac_join+0x6a8/0x880 net/ipv6/anycast.c:153 > do_ipv6_setsockopt+0x203a/0x3150 net/ipv6/ipv6_sockglue.c:893 > ipv6_setsockopt+0x59/0x170 net/ipv6/ipv6_sockglue.c:965 > do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2381 > __sys_setsockopt net/socket.c:2406 [inline] > __do_sys_setsockopt net/socket.c:2412 [inline] > __se_sys_setsockopt net/socket.c:2409 [inline] > __x64_sys_setsockopt+0x13d/0x1b0 net/socket.c:2409 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > SOFTIRQ-ON-W at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] > _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 > spin_lock include/linux/spinlock.h:342 [inline] > ipv6_del_acaddr_hash net/ipv6/anycast.c:253 [inline] > __ipv6_dev_ac_dec+0x459/0x690 net/ipv6/anycast.c:419 > ipv6_dev_ac_dec net/ipv6/anycast.c:438 [inline] > __ipv6_sock_ac_close+0x24e/0x430 net/ipv6/anycast.c:224 > inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:470 > __sock_release net/socket.c:722 [inline] > sock_close+0xc3/0x240 net/socket.c:1514 > __fput+0x44f/0xa60 fs/file_table.c:510 > task_work_run+0x1d9/0x270 kernel/task_work.c:233 > resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] > __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] > exit_to_user_mode_loop+0xf3/0x4d0 kernel/entry/common.c:98 > __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] > syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] > syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] > do_syscall_64+0x33e/0x560 arch/x86/entry/syscall_64.c:100 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > INITIAL USE at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] > _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 > spin_lock include/linux/spinlock.h:342 [inline] > ipv6_add_acaddr_hash net/ipv6/anycast.c:246 [inline] > __ipv6_dev_ac_inc+0x6c8/0xb10 net/ipv6/anycast.c:374 > ipv6_sock_ac_join+0x6a8/0x880 net/ipv6/anycast.c:153 > do_ipv6_setsockopt+0x203a/0x3150 net/ipv6/ipv6_sockglue.c:893 > ipv6_setsockopt+0x59/0x170 net/ipv6/ipv6_sockglue.c:965 > do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2381 > __sys_setsockopt net/socket.c:2406 [inline] > __do_sys_setsockopt net/socket.c:2412 [inline] > __se_sys_setsockopt net/socket.c:2409 [inline] > __x64_sys_setsockopt+0x13d/0x1b0 net/socket.c:2409 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > } > ... key at: [<ffffffff8fef3d98>] acaddr_hash_lock+0x18/0x60 anycast.c:-1 > ... acquired at: > mark_lock+0x115/0x190 kernel/locking/lockdep.c:4753 > mark_usage kernel/locking/lockdep.c:-1 [inline] > __lock_acquire+0x9f9/0x2cf0 kernel/locking/lockdep.c:5191 > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] > _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 > spin_lock include/linux/spinlock.h:342 [inline] > ipv6_del_acaddr_hash net/ipv6/anycast.c:253 [inline] > __ipv6_dev_ac_dec+0x459/0x690 net/ipv6/anycast.c:419 > ipv6_dev_ac_dec net/ipv6/anycast.c:438 [inline] > __ipv6_sock_ac_close+0x24e/0x430 net/ipv6/anycast.c:224 > inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:470 > __sock_release net/socket.c:722 [inline] > sock_close+0xc3/0x240 net/socket.c:1514 > __fput+0x44f/0xa60 fs/file_table.c:510 > task_work_run+0x1d9/0x270 kernel/task_work.c:233 > resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] > __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] > exit_to_user_mode_loop+0xf3/0x4d0 kernel/entry/common.c:98 > __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] > syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] > syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] > do_syscall_64+0x33e/0x560 arch/x86/entry/syscall_64.c:100 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > stack backtrace: > CPU: 1 UID: 0 PID: 5872 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > Call Trace: > <TASK> > dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 > print_irq_inversion_bug+0x1d2/0x1e0 kernel/locking/lockdep.c:4125 > mark_lock_irq+0x3d2/0x420 kernel/locking/lockdep.c:-1 > mark_lock+0x115/0x190 kernel/locking/lockdep.c:4753 > mark_usage kernel/locking/lockdep.c:-1 [inline] > __lock_acquire+0x9f9/0x2cf0 kernel/locking/lockdep.c:5191 > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] > _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 > spin_lock include/linux/spinlock.h:342 [inline] > ipv6_del_acaddr_hash net/ipv6/anycast.c:253 [inline] > __ipv6_dev_ac_dec+0x459/0x690 net/ipv6/anycast.c:419 > ipv6_dev_ac_dec net/ipv6/anycast.c:438 [inline] > __ipv6_sock_ac_close+0x24e/0x430 net/ipv6/anycast.c:224 > inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:470 > __sock_release net/socket.c:722 [inline] > sock_close+0xc3/0x240 net/socket.c:1514 > __fput+0x44f/0xa60 fs/file_table.c:510 > task_work_run+0x1d9/0x270 kernel/task_work.c:233 > resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] > __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] > exit_to_user_mode_loop+0xf3/0x4d0 kernel/entry/common.c:98 > __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] > syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] > syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] > do_syscall_64+0x33e/0x560 arch/x86/entry/syscall_64.c:100 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f2cd559ce59 > Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffe5c3cd978 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 > RAX: 0000000000000000 RBX: 00007ffe5c3cda60 RCX: 00007f2cd559ce59 > RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 > RBP: 000000000000fd56 R08: 0000000000000001 R09: 0000000000000000 > R10: 0000001b32c20000 R11: 0000000000000246 R12: 00007ffe5c3cdaa0 > R13: 00007f2cd5815fac R14: 000000000000fd8b R15: 00007f2cd5815fa0 > </TASK> > > > *** > > possible deadlock in addrconf_rs_timer > > tree: net > URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net.git > base: ab4ac5a93b1b76aa6b12cadcba30450868d21a6f > arch: amd64 > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > config: https://ci.syzbot.org/builds/9ba0a1a3-43c2-4334-8f26-942c72690313/config > syz repro: https://ci.syzbot.org/findings/e48c441f-1967-4acb-8d02-6ec4625160de/syz_repro > > ======================================================== > WARNING: possible irq lock inversion dependency detected > syzkaller #0 Not tainted > -------------------------------------------------------- > syz-executor/5739 just changed the state of lock: > ffff888114e00578 (&ndev->lock){++-.}-{3:3}, at: addrconf_rs_timer+0xc8/0x6d0 net/ipv6/addrconf.c:4033 > but this lock took another, SOFTIRQ-unsafe lock in the past: > (acaddr_hash_lock){+.+.}-{3:3} > > > and interrupts could create inverse lock ordering between them. > > > other info that might help us debug this: > Possible interrupt unsafe locking scenario: > > CPU0 CPU1 > ---- ---- > lock(acaddr_hash_lock); > local_irq_disable(); > lock(&ndev->lock); > lock(acaddr_hash_lock); > <Interrupt> > lock(&ndev->lock); > > *** DEADLOCK *** > > 2 locks held by syz-executor/5739: > #0: ffff88816c92cce0 (&xt[i].mutex){+.+.}-{4:4}, at: xt_find_table_lock+0x51/0x3f0 net/netfilter/x_tables.c:1336 > #1: ffffc90000007cc0 ((&ndev->rs_timer)){+.-.}-{0:0}, at: call_timer_fn+0xd4/0x5e0 kernel/time/timer.c:1745 > > the shortest dependencies between 2nd lock and 1st lock: > -> (acaddr_hash_lock){+.+.}-{3:3} { > HARDIRQ-ON-W at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] > _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 > spin_lock include/linux/spinlock.h:342 [inline] > ipv6_add_acaddr_hash net/ipv6/anycast.c:246 [inline] > __ipv6_dev_ac_inc+0x6c8/0xb10 net/ipv6/anycast.c:374 > ipv6_sock_ac_join+0x6a8/0x880 net/ipv6/anycast.c:153 > do_ipv6_setsockopt+0x203a/0x3150 net/ipv6/ipv6_sockglue.c:893 > ipv6_setsockopt+0x59/0x170 net/ipv6/ipv6_sockglue.c:965 > do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2381 > __sys_setsockopt net/socket.c:2406 [inline] > __do_sys_setsockopt net/socket.c:2412 [inline] > __se_sys_setsockopt net/socket.c:2409 [inline] > __x64_sys_setsockopt+0x13d/0x1b0 net/socket.c:2409 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > SOFTIRQ-ON-W at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] > _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 > spin_lock include/linux/spinlock.h:342 [inline] > ipv6_del_acaddr_hash net/ipv6/anycast.c:253 [inline] > __ipv6_dev_ac_dec+0x459/0x690 net/ipv6/anycast.c:419 > ipv6_dev_ac_dec net/ipv6/anycast.c:438 [inline] > __ipv6_sock_ac_close+0x24e/0x430 net/ipv6/anycast.c:224 > inet6_release+0x4f/0x70 net/ipv6/af_inet6.c:470 > __sock_release net/socket.c:722 [inline] > sock_close+0xc3/0x240 net/socket.c:1514 > __fput+0x44f/0xa60 fs/file_table.c:510 > task_work_run+0x1d9/0x270 kernel/task_work.c:233 > resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] > __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] > exit_to_user_mode_loop+0xf3/0x4d0 kernel/entry/common.c:98 > __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] > syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] > syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] > do_syscall_64+0x33e/0x560 arch/x86/entry/syscall_64.c:100 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > INITIAL USE at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] > _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 > spin_lock include/linux/spinlock.h:342 [inline] > ipv6_add_acaddr_hash net/ipv6/anycast.c:246 [inline] > __ipv6_dev_ac_inc+0x6c8/0xb10 net/ipv6/anycast.c:374 > ipv6_sock_ac_join+0x6a8/0x880 net/ipv6/anycast.c:153 > do_ipv6_setsockopt+0x203a/0x3150 net/ipv6/ipv6_sockglue.c:893 > ipv6_setsockopt+0x59/0x170 net/ipv6/ipv6_sockglue.c:965 > do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2381 > __sys_setsockopt net/socket.c:2406 [inline] > __do_sys_setsockopt net/socket.c:2412 [inline] > __se_sys_setsockopt net/socket.c:2409 [inline] > __x64_sys_setsockopt+0x13d/0x1b0 net/socket.c:2409 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > } > ... key at: [<ffffffff8fef3d98>] acaddr_hash_lock+0x18/0x60 anycast.c:-1 > ... acquired at: > __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline] > _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158 > spin_lock include/linux/spinlock.h:342 [inline] > ipv6_add_acaddr_hash net/ipv6/anycast.c:246 [inline] > __ipv6_dev_ac_inc+0x6c8/0xb10 net/ipv6/anycast.c:374 > ipv6_sock_ac_join+0x6a8/0x880 net/ipv6/anycast.c:153 > do_ipv6_setsockopt+0x203a/0x3150 net/ipv6/ipv6_sockglue.c:893 > ipv6_setsockopt+0x59/0x170 net/ipv6/ipv6_sockglue.c:965 > do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2381 > __sys_setsockopt net/socket.c:2406 [inline] > __do_sys_setsockopt net/socket.c:2412 [inline] > __se_sys_setsockopt net/socket.c:2409 [inline] > __x64_sys_setsockopt+0x13d/0x1b0 net/socket.c:2409 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > -> (&ndev->lock){++-.}-{3:3} { > HARDIRQ-ON-W at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_write_lock_bh include/linux/rwlock_api_smp.h:221 [inline] > _raw_write_lock_bh+0x36/0x50 kernel/locking/spinlock.c:338 > addrconf_permanent_addr+0x16a/0xa20 net/ipv6/addrconf.c:3627 > addrconf_notify+0x864/0x1050 net/ipv6/addrconf.c:3706 > notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85 > call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] > call_netdevice_notifiers net/core/dev.c:2301 [inline] > __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9797 > netif_change_flags+0xe8/0x1a0 net/core/dev.c:9826 > dev_change_flags+0x130/0x270 net/core/dev_api.c:68 > devinet_ioctl+0x9f2/0x1b30 net/ipv4/devinet.c:1199 > inet_ioctl+0x42a/0x560 net/ipv4/af_inet.c:1011 > sock_do_ioctl+0x101/0x320 net/socket.c:1313 > sock_ioctl+0x5c6/0x7f0 net/socket.c:1434 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:597 [inline] > __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > HARDIRQ-ON-R at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_read_lock_bh include/linux/rwlock_api_smp.h:192 [inline] > _raw_read_lock_bh+0x3e/0x50 kernel/locking/spinlock.c:256 > inet6_fill_ifla6_attrs+0x1117/0x25e0 net/ipv6/addrconf.c:5858 > inet6_fill_link_af+0x9b/0x120 net/ipv6/addrconf.c:5893 > rtnl_fill_link_af+0x1c8/0x440 net/core/rtnetlink.c:1919 > rtnl_fill_ifinfo+0x1e08/0x20f0 net/core/rtnetlink.c:2190 > rtmsg_ifinfo_build_skb+0x17d/0x260 net/core/rtnetlink.c:4454 > rtmsg_ifinfo_event net/core/rtnetlink.c:4487 [inline] > rtmsg_ifinfo+0x8c/0x1a0 net/core/rtnetlink.c:4496 > register_netdevice+0x1aca/0x1ec0 net/core/dev.c:11475 > register_netdev+0x40/0x60 net/core/dev.c:11539 > vti6_init_net+0x238/0x370 net/ipv6/ip6_vti.c:1167 > ops_init+0x35c/0x5c0 net/core/net_namespace.c:137 > __register_pernet_operations net/core/net_namespace.c:1318 [inline] > register_pernet_operations+0x343/0x830 net/core/net_namespace.c:1395 > register_pernet_device+0x2a/0x80 net/core/net_namespace.c:1482 > vti6_tunnel_init+0x13/0x170 net/ipv6/ip6_vti.c:1251 > do_one_initcall+0x250/0x870 init/main.c:1392 > do_initcall_level+0x104/0x190 init/main.c:1454 > do_initcalls+0x59/0xa0 init/main.c:1470 > kernel_init_freeable+0x2a6/0x3e0 init/main.c:1703 > kernel_init+0x1d/0x1d0 init/main.c:1593 > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > IN-SOFTIRQ-W at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_write_lock include/linux/rwlock_api_smp.h:229 [inline] > _raw_write_lock+0x2e/0x40 kernel/locking/spinlock.c:304 > addrconf_rs_timer+0xc8/0x6d0 net/ipv6/addrconf.c:4033 > call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748 > expire_timers kernel/time/timer.c:1799 [inline] > __run_timers kernel/time/timer.c:2374 [inline] > __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386 > run_timer_base kernel/time/timer.c:2395 [inline] > run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405 > handle_softirqs+0x22a/0x840 kernel/softirq.c:622 > __do_softirq kernel/softirq.c:656 [inline] > invoke_softirq kernel/softirq.c:496 [inline] > __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 > irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 > instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] > sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061 > asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 > zone_watermark_fast+0xf7/0x230 mm/page_alloc.c:3686 > get_page_from_freelist+0x537/0x2610 mm/page_alloc.c:3885 > __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5221 > __alloc_pages_noprof+0x10/0x100 mm/page_alloc.c:5255 > alloc_pages_bulk_noprof+0x5ff/0x7c0 mm/page_alloc.c:5175 > alloc_pages_bulk_mempolicy_noprof+0x34e/0x1680 mm/mempolicy.c:2798 > vm_area_alloc_pages mm/vmalloc.c:3700 [inline] > __vmalloc_area_node mm/vmalloc.c:3878 [inline] > __vmalloc_node_range_noprof+0xad1/0x1750 mm/vmalloc.c:4064 > __vmalloc_node_noprof mm/vmalloc.c:4124 [inline] > vzalloc_noprof+0xb2/0xe0 mm/vmalloc.c:4202 > alloc_counters+0x64/0x5d0 net/ipv4/netfilter/ip_tables.c:799 > copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline] > get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline] > do_ip6t_get_ctl+0xabd/0x1230 net/ipv6/netfilter/ip6_tables.c:1677 > nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116 > ipv6_getsockopt+0x1fd/0x2b0 net/ipv6/ipv6_sockglue.c:1464 > do_sock_getsockopt+0x51d/0x7e0 net/socket.c:2487 > __sys_getsockopt net/socket.c:2518 [inline] > __do_sys_getsockopt net/socket.c:2525 [inline] > __se_sys_getsockopt net/socket.c:2522 [inline] > __x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2522 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > INITIAL USE at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_write_lock_bh include/linux/rwlock_api_smp.h:221 [inline] > _raw_write_lock_bh+0x36/0x50 kernel/locking/spinlock.c:338 > addrconf_permanent_addr+0x16a/0xa20 net/ipv6/addrconf.c:3627 > addrconf_notify+0x864/0x1050 net/ipv6/addrconf.c:3706 > notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85 > call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] > call_netdevice_notifiers net/core/dev.c:2301 [inline] > __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9797 > netif_change_flags+0xe8/0x1a0 net/core/dev.c:9826 > dev_change_flags+0x130/0x270 net/core/dev_api.c:68 > devinet_ioctl+0x9f2/0x1b30 net/ipv4/devinet.c:1199 > inet_ioctl+0x42a/0x560 net/ipv4/af_inet.c:1011 > sock_do_ioctl+0x101/0x320 net/socket.c:1313 > sock_ioctl+0x5c6/0x7f0 net/socket.c:1434 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:597 [inline] > __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > INITIAL READ USE at: > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_read_lock_bh include/linux/rwlock_api_smp.h:192 [inline] > _raw_read_lock_bh+0x3e/0x50 kernel/locking/spinlock.c:256 > inet6_fill_ifla6_attrs+0x1117/0x25e0 net/ipv6/addrconf.c:5858 > inet6_fill_link_af+0x9b/0x120 net/ipv6/addrconf.c:5893 > rtnl_fill_link_af+0x1c8/0x440 net/core/rtnetlink.c:1919 > rtnl_fill_ifinfo+0x1e08/0x20f0 net/core/rtnetlink.c:2190 > rtmsg_ifinfo_build_skb+0x17d/0x260 net/core/rtnetlink.c:4454 > rtmsg_ifinfo_event net/core/rtnetlink.c:4487 [inline] > rtmsg_ifinfo+0x8c/0x1a0 net/core/rtnetlink.c:4496 > register_netdevice+0x1aca/0x1ec0 net/core/dev.c:11475 > register_netdev+0x40/0x60 net/core/dev.c:11539 > vti6_init_net+0x238/0x370 net/ipv6/ip6_vti.c:1167 > ops_init+0x35c/0x5c0 net/core/net_namespace.c:137 > __register_pernet_operations net/core/net_namespace.c:1318 [inline] > register_pernet_operations+0x343/0x830 net/core/net_namespace.c:1395 > register_pernet_device+0x2a/0x80 net/core/net_namespace.c:1482 > vti6_tunnel_init+0x13/0x170 net/ipv6/ip6_vti.c:1251 > do_one_initcall+0x250/0x870 init/main.c:1392 > do_initcall_level+0x104/0x190 init/main.c:1454 > do_initcalls+0x59/0xa0 init/main.c:1470 > kernel_init_freeable+0x2a6/0x3e0 init/main.c:1703 > kernel_init+0x1d/0x1d0 init/main.c:1593 > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > } > ... key at: [<ffffffff9a982fe0>] ipv6_add_dev.__key+0x0/0x20 > ... acquired at: > mark_lock+0x115/0x190 kernel/locking/lockdep.c:4753 > mark_usage kernel/locking/lockdep.c:-1 [inline] > __lock_acquire+0x689/0x2cf0 kernel/locking/lockdep.c:5191 > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_write_lock include/linux/rwlock_api_smp.h:229 [inline] > _raw_write_lock+0x2e/0x40 kernel/locking/spinlock.c:304 > addrconf_rs_timer+0xc8/0x6d0 net/ipv6/addrconf.c:4033 > call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748 > expire_timers kernel/time/timer.c:1799 [inline] > __run_timers kernel/time/timer.c:2374 [inline] > __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386 > run_timer_base kernel/time/timer.c:2395 [inline] > run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405 > handle_softirqs+0x22a/0x840 kernel/softirq.c:622 > __do_softirq kernel/softirq.c:656 [inline] > invoke_softirq kernel/softirq.c:496 [inline] > __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 > irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 > instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] > sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061 > asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 > zone_watermark_fast+0xf7/0x230 mm/page_alloc.c:3686 > get_page_from_freelist+0x537/0x2610 mm/page_alloc.c:3885 > __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5221 > __alloc_pages_noprof+0x10/0x100 mm/page_alloc.c:5255 > alloc_pages_bulk_noprof+0x5ff/0x7c0 mm/page_alloc.c:5175 > alloc_pages_bulk_mempolicy_noprof+0x34e/0x1680 mm/mempolicy.c:2798 > vm_area_alloc_pages mm/vmalloc.c:3700 [inline] > __vmalloc_area_node mm/vmalloc.c:3878 [inline] > __vmalloc_node_range_noprof+0xad1/0x1750 mm/vmalloc.c:4064 > __vmalloc_node_noprof mm/vmalloc.c:4124 [inline] > vzalloc_noprof+0xb2/0xe0 mm/vmalloc.c:4202 > alloc_counters+0x64/0x5d0 net/ipv4/netfilter/ip_tables.c:799 > copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline] > get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline] > do_ip6t_get_ctl+0xabd/0x1230 net/ipv6/netfilter/ip6_tables.c:1677 > nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116 > ipv6_getsockopt+0x1fd/0x2b0 net/ipv6/ipv6_sockglue.c:1464 > do_sock_getsockopt+0x51d/0x7e0 net/socket.c:2487 > __sys_getsockopt net/socket.c:2518 [inline] > __do_sys_getsockopt net/socket.c:2525 [inline] > __se_sys_getsockopt net/socket.c:2522 [inline] > __x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2522 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > stack backtrace: > CPU: 0 UID: 0 PID: 5739 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > Call Trace: > <IRQ> > dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 > print_irq_inversion_bug+0x1d2/0x1e0 kernel/locking/lockdep.c:4125 > mark_lock_irq+0x3d2/0x420 kernel/locking/lockdep.c:-1 > mark_lock+0x115/0x190 kernel/locking/lockdep.c:4753 > mark_usage kernel/locking/lockdep.c:-1 [inline] > __lock_acquire+0x689/0x2cf0 kernel/locking/lockdep.c:5191 > lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 > __raw_write_lock include/linux/rwlock_api_smp.h:229 [inline] > _raw_write_lock+0x2e/0x40 kernel/locking/spinlock.c:304 > addrconf_rs_timer+0xc8/0x6d0 net/ipv6/addrconf.c:4033 > call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748 > expire_timers kernel/time/timer.c:1799 [inline] > __run_timers kernel/time/timer.c:2374 [inline] > __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386 > run_timer_base kernel/time/timer.c:2395 [inline] > run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405 > handle_softirqs+0x22a/0x840 kernel/softirq.c:622 > __do_softirq kernel/softirq.c:656 [inline] > invoke_softirq kernel/softirq.c:496 [inline] > __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 > irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 > instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] > sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061 > </IRQ> > <TASK> > asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 > RIP: 0010:zone_watermark_fast+0xf7/0x230 mm/page_alloc.c:3687 > Code: 00 00 fc ff df 80 3c 08 00 74 08 48 89 ef e8 d0 01 0e 00 48 8b 45 00 31 c9 48 85 c0 48 0f 4f c8 49 01 cd 4c 39 eb 4c 0f 4c eb <49> 8d 46 38 48 63 2c 24 83 fd 05 0f 83 08 01 00 00 49 89 df 4d 29 > RSP: 0018:ffffc900045cf018 EFLAGS: 00000202 > RAX: 0000000000000000 RBX: 0000000000001a43 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88815fffc810 > RBP: ffff88815fffc810 R08: ffff88815fffc817 R09: 1ffff1102bfff902 > R10: dffffc0000000000 R11: ffffed102bfff903 R12: 0000000000000000 > R13: 0000000000000000 R14: ffff88815fffc100 R15: 0000000000000901 > get_page_from_freelist+0x537/0x2610 mm/page_alloc.c:3885 > __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5221 > __alloc_pages_noprof+0x10/0x100 mm/page_alloc.c:5255 > alloc_pages_bulk_noprof+0x5ff/0x7c0 mm/page_alloc.c:5175 > alloc_pages_bulk_mempolicy_noprof+0x34e/0x1680 mm/mempolicy.c:2798 > vm_area_alloc_pages mm/vmalloc.c:3700 [inline] > __vmalloc_area_node mm/vmalloc.c:3878 [inline] > __vmalloc_node_range_noprof+0xad1/0x1750 mm/vmalloc.c:4064 > __vmalloc_node_noprof mm/vmalloc.c:4124 [inline] > vzalloc_noprof+0xb2/0xe0 mm/vmalloc.c:4202 > alloc_counters+0x64/0x5d0 net/ipv4/netfilter/ip_tables.c:799 > copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline] > get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline] > do_ip6t_get_ctl+0xabd/0x1230 net/ipv6/netfilter/ip6_tables.c:1677 > nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116 > ipv6_getsockopt+0x1fd/0x2b0 net/ipv6/ipv6_sockglue.c:1464 > do_sock_getsockopt+0x51d/0x7e0 net/socket.c:2487 > __sys_getsockopt net/socket.c:2518 [inline] > __do_sys_getsockopt net/socket.c:2525 [inline] > __se_sys_getsockopt net/socket.c:2522 [inline] > __x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2522 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fb03e19e62a > Code: 48 83 ec 10 89 d2 48 63 ff 45 31 c9 6a 2a 45 31 c0 31 c9 e8 d8 99 fb ff 48 83 c4 18 c3 0f 1f 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff f7 > RSP: 002b:00007ffc25639248 EFLAGS: 00000212 ORIG_RAX: 0000000000000037 > RAX: ffffffffffffffda RBX: 00007ffc256392d0 RCX: 00007fb03e19e62a > RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003 > RBP: 0000000000000003 R08: 00007ffc2563926c R09: ffffffffff000000 > R10: 00007ffc256392d0 R11: 0000000000000212 R12: 00007fb03e3ea240 > R13: 00007ffc2563926c R14: 0000000000000000 R15: 00007fb03e3eafc0 > </TASK> > ---------------- > Code disassembly (best guess), 4 bytes skipped: > 0: df 80 3c 08 00 74 filds 0x7400083c(%rax) > 6: 08 48 89 or %cl,-0x77(%rax) > 9: ef out %eax,(%dx) > a: e8 d0 01 0e 00 call 0xe01df > f: 48 8b 45 00 mov 0x0(%rbp),%rax > 13: 31 c9 xor %ecx,%ecx > 15: 48 85 c0 test %rax,%rax > 18: 48 0f 4f c8 cmovg %rax,%rcx > 1c: 49 01 cd add %rcx,%r13 > 1f: 4c 39 eb cmp %r13,%rbx > 22: 4c 0f 4c eb cmovl %rbx,%r13 > * 26: 49 8d 46 38 lea 0x38(%r14),%rax <-- trapping instruction > 2a: 48 63 2c 24 movslq (%rsp),%rbp > 2e: 83 fd 05 cmp $0x5,%ebp > 31: 0f 83 08 01 00 00 jae 0x13f > 37: 49 89 df mov %rbx,%r15 > 3a: 4d rex.WRB > 3b: 29 .byte 0x29 > > > *** > > If these findings have caused you to resend the series or submit a > separate fix, please add the following tag to your commit message: > Tested-by: [email protected] > > --- > This report is generated by a bot. It may contain errors. > syzbot ci engineers can be reached at [email protected]. > > To test a patch for this bug, please reply with `#syz test` > (should be on a separate line). > > The patch should be attached to the email. > Note: arguments like custom git repos and branches are not supported. > > The email will later be sent to: > [[email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected]] > > If the report looks fine to you, reply with: > #syz upstream > > If the report is a false positive, reply with > #syz invalid > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-upstream-moderation" group. > To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. > To view this discussion visit https://groups.google.com/d/msgid/syzkaller-upstream-moderation/6a194bea.b111c304.35cd64.0011.GAE%40google.com.