Re: [syzbot] [bridge?] kernel BUG in __get_vm_area_node
Ido Schimmel <[email protected]> Tue, 12 May 2026 11:47:54 +0300
| Newsgroups | dev.linux.lists.bridge,org.kernel.vger.linux-kernel,org.kernel.vger.netdev |
|---|---|
| Message-ID | <20260512084754.GA181587@shredder> |
On Sat, May 09, 2026 at 12:35:24PM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 9207d47f966b Merge tag 'for-linus' of git://git.kernel.org.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=17e44d06580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d0f0911eedbc130a > dashboard link: https://syzkaller.appspot.com/bug?extid=8b12fc6e0fb139765b58 > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > userspace arch: i386 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-9207d47f.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/6c5e883f31aa/vmlinux-9207d47f.xz > kernel image: https://storage.googleapis.com/syzbot-assets/19f3e863ae5c/bzImage-9207d47f.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: [email protected] > > ------------[ cut here ]------------ > kernel BUG at mm/vmalloc.c:3206! It seems that this bug was fixed by commit 30c19366636f ("mm: fix BUG splat with kvmalloc + GFP_ATOMIC"), but then commit c6307674ed82 ("mm: kvmalloc: add non-blocking support for vmalloc") re-introduced it. Uladzislau, can you please look into it? Note that the bridge is calling rhashtable_lookup_insert_fast() with BH disabled. Thanks > Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI > CPU: 1 UID: 0 PID: 8030 Comm: syz.6.9336 Tainted: G L syzkaller #0 PREEMPT(full) > Tainted: [L]=SOFTLOCKUP > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > RIP: 0010:__get_vm_area_node+0x2d2/0x330 mm/vmalloc.c:3206 > Code: 03 80 3c 11 00 75 5c 48 89 43 08 e9 4b ff ff ff e8 43 a8 a4 ff 48 89 df e8 db 98 05 00 31 db e9 37 ff ff ff e8 2f a8 a4 ff 90 <0f> 0b e8 77 6b 11 00 e9 9e fe ff ff e8 6d 6b 11 00 e9 71 fe ff ff > RSP: 0018:ffffc90006f76860 EFLAGS: 00010246 > RAX: 0000000000080000 RBX: 0000000000000200 RCX: ffffc90034405000 > RDX: 0000000000080000 RSI: ffffffff82633fb1 RDI: ffff8880244b4a00 > RBP: 000000000000000c R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000022 > R13: 0000000000008080 R14: 0000000000000001 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff88809727d000(0063) knlGS:00000000f4f61b40 > CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 > CR2: 00000000f73c4f50 CR3: 0000000055b77000 CR4: 0000000000352ef0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > __vmalloc_node_range_noprof+0x228/0x1630 mm/vmalloc.c:4024 > __kvmalloc_node_noprof+0x3de/0xa00 mm/slub.c:6860 > bucket_table_alloc.isra.0+0x88/0x460 lib/rhashtable.c:186 > rhashtable_insert_rehash lib/rhashtable.c:493 [inline] > rhashtable_try_insert lib/rhashtable.c:661 [inline] > rhashtable_insert_slow+0x16ab/0x1de0 lib/rhashtable.c:674 > __rhashtable_insert_fast include/linux/rhashtable.h:788 [inline] > rhashtable_lookup_insert_fast include/linux/rhashtable.h:965 [inline] > fdb_create+0x13cf/0x1920 net/bridge/br_fdb.c:415 > fdb_add_local net/bridge/br_fdb.c:450 [inline] > fdb_add_local+0x155/0x1c0 net/bridge/br_fdb.c:430 > br_fdb_add_local+0x39/0x60 net/bridge/br_fdb.c:960 > __vlan_add+0x17f3/0x2e10 net/bridge/br_vlan.c:340 > br_vlan_add+0x2dc/0xa00 net/bridge/br_vlan.c:810 > __vlan_add+0xf7c/0x2e10 net/bridge/br_vlan.c:297 > nbp_vlan_add+0x258/0x3e0 net/bridge/br_vlan.c:1348 > br_vlan_info+0x159/0x3d0 net/bridge/br_netlink.c:705 > br_process_vlan_info+0x404/0x8f0 net/bridge/br_netlink.c:768 > br_afspec+0x422/0x650 net/bridge/br_netlink.c:836 > br_setlink+0x376/0x630 net/bridge/br_netlink.c:1135 > rtnl_bridge_setlink+0x56d/0x740 net/core/rtnetlink.c:5571 > rtnetlink_rcv_msg+0x3c9/0xe90 net/core/rtnetlink.c:7004 > netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2550 > netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] > netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1344 > netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894 > sock_sendmsg_nosec net/socket.c:787 [inline] > __sock_sendmsg net/socket.c:802 [inline] > ____sys_sendmsg+0x9e1/0xb70 net/socket.c:2698 > ___sys_sendmsg+0x190/0x1e0 net/socket.c:2752 > __sys_sendmsg+0x170/0x220 net/socket.c:2784 > do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] > __do_fast_syscall_32+0xe7/0x950 arch/x86/entry/syscall_32.c:307 > do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332 > entry_SYSENTER_compat_after_hwframe+0x84/0x8e > RIP: 0023:0xf7f08fcc > Code: d2 74 05 c1 e8 0c 89 02 8b 5d fc 31 c0 c9 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 2e 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 58 b8 > RSP: 002b:00000000f4f6150c EFLAGS: 00000292 ORIG_RAX: 0000000000000172 > RAX: ffffffffffffffda RBX: 000000000000000c RCX: 0000000080000040 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:__get_vm_area_node+0x2d2/0x330 mm/vmalloc.c:3206 > Code: 03 80 3c 11 00 75 5c 48 89 43 08 e9 4b ff ff ff e8 43 a8 a4 ff 48 89 df e8 db 98 05 00 31 db e9 37 ff ff ff e8 2f a8 a4 ff 90 <0f> 0b e8 77 6b 11 00 e9 9e fe ff ff e8 6d 6b 11 00 e9 71 fe ff ff > RSP: 0018:ffffc90006f76860 EFLAGS: 00010246 > RAX: 0000000000080000 RBX: 0000000000000200 RCX: ffffc90034405000 > RDX: 0000000000080000 RSI: ffffffff82633fb1 RDI: ffff8880244b4a00 > RBP: 000000000000000c R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000022 > R13: 0000000000008080 R14: 0000000000000001 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff88809727d000(0063) knlGS:00000000f4f61b40 > CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 > CR2: 00000000f73c4f50 CR3: 0000000055b77000 CR4: 0000000000352ef0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess): > 0: d2 74 05 c1 shlb %cl,-0x3f(%rbp,%rax,1) > 4: e8 0c 89 02 8b call 0x8b028915 > 9: 5d pop %rbp > a: fc cld > b: 31 c0 xor %eax,%eax > d: c9 leave > e: c3 ret > f: 90 nop > 10: 90 nop > 11: 90 nop > 12: 90 nop > 13: 90 nop > 14: 90 nop > 15: 90 nop > 16: 90 nop > 17: 90 nop > 18: 90 nop > 19: 90 nop > 1a: 90 nop > 1b: 90 nop > 1c: 90 nop > 1d: 90 nop > 1e: 0f 1f 00 nopl (%rax) > 21: 51 push %rcx > 22: 52 push %rdx > 23: 55 push %rbp > 24: 89 e5 mov %esp,%ebp > 26: 0f 34 sysenter > 28: cd 80 int $0x80 > * 2a: 5d pop %rbp <-- trapping instruction > 2b: 5a pop %rdx > 2c: 59 pop %rcx > 2d: c3 ret > 2e: 90 nop > 2f: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi > 36: 00 > 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi > 3e: 58 pop %rax > 3f: b8 .byte 0xb8 > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at [email protected]. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup