Re: [moderation/CI] Re: zram: fix early release of global cdict/ddict in per-CPU error path
Aleksandr Nogikh <[email protected]> Wed, 29 Jul 2026 14:11:34 +0200
| Newsgroups | dev.linux.lists.syzbot |
|---|---|
| Message-ID | <CANp29Y4Rn9RqcbzdTsk5ZaFqOHijkVGXuwd7ecCCPgxfKucdTA@mail.gmail.com> |
No, not related. #syz invalid On Wed, Jul 29, 2026 at 12:58=E2=80=AFPM syzbot ci <[email protected]> wrote: > > syzbot ci has tested the following series > > [v2] zram: fix early release of global cdict/ddict in per-CPU error path > https://lore.kernel.org/all/[email protected] > * [PATCH v2 1/5] zram: fix early release of global cdict/ddict in per-CPU= error path > * [PATCH v2 2/5] zram: make dict update in comp_params_store() atomic > * [PATCH v2 3/5] zstd: move ZSTD_MAX_CLEVEL to zstd_lib.h > * [PATCH v2 4/5] zram: add per-backend caps and validate parameters early > * [PATCH v2 5/5] zram: reset per-priority params when changing algorithm = before init > > and found the following issue: > KASAN: slab-use-after-free Read in event_handler > > Full report is available here: > https://ci.syzbot.org/series/e2672818-2e9a-4685-8cee-6e5202cb0372 > > *** > > KASAN: slab-use-after-free Read in event_handler > > tree: axboe > URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/axboe= /linux.git > base: 923b1b5a3a5cc642172d8cf8c6097ad1169b6217 > arch: amd64 > compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~e= xp1~20260613092250.77), Debian LLD 22.1.8 > config: https://ci.syzbot.org/builds/444dc77b-c272-46a7-ac65-9b594a954= b56/config > syz repro: https://ci.syzbot.org/findings/6c520622-cfcc-490d-88c4-b7f2828= 8e76c/syz_repro > > vhci_hcd vhci_hcd.0: release socket > vhci_hcd vhci_hcd.0: disconnect device > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/= spinlock_api_smp.h:132 [inline] > BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x40/0x60 kerne= l/locking/spinlock.c:166 > Read of size 1 at addr ffff88816d3a8478 by task kworker/u8:5/5796 > > CPU: 1 UID: 0 PID: 5796 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEM= PT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.= 16.2-1 04/01/2014 > Workqueue: usbip_event event_handler > Call Trace: > <TASK> > dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 > print_address_description+0x55/0x1e0 mm/kasan/report.c:378 > print_report+0x58/0x70 mm/kasan/report.c:482 > kasan_report+0x117/0x150 mm/kasan/report.c:595 > __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574 > kasan_check_byte include/linux/kasan.h:402 [inline] > lock_acquire+0x84/0x350 kernel/locking/lockdep.c:5842 > __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline] > _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166 > unset_event drivers/usb/usbip/usbip_event.c:35 [inline] > event_handler+0x2b0/0x4b0 drivers/usb/usbip/usbip_event.c:80 > process_one_work kernel/workqueue.c:3322 [inline] > process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 > worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 > kthread+0x388/0x470 kernel/kthread.c:436 > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > </TASK> > > Allocated by task 1: > kasan_save_stack mm/kasan/common.c:57 [inline] > kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 > poison_kmalloc_redzone mm/kasan/common.c:398 [inline] > __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 > kasan_kmalloc include/linux/kasan.h:263 [inline] > __do_kmalloc_node mm/slub.c:5362 [inline] > __kmalloc_noprof+0x375/0x720 mm/slub.c:5387 > _kmalloc_noprof include/linux/slab.h:973 [inline] > _kzalloc_noprof include/linux/slab.h:1290 [inline] > __usb_create_hcd+0x67/0x900 drivers/usb/core/hcd.c:2566 > vhci_hcd_probe+0x104/0x3e0 drivers/usb/usbip/vhci_hcd.c:1378 > platform_probe+0xf9/0x190 drivers/base/platform.c:1439 > call_driver_probe drivers/base/dd.c:-1 [inline] > really_probe+0x254/0xae0 drivers/base/dd.c:706 > __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 > driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 > __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 > bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 > __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 > device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 > bus_probe_device+0x12a/0x220 drivers/base/bus.c:620 > device_add+0x7d7/0xb80 drivers/base/core.c:3772 > platform_device_add+0x4bd/0x860 drivers/base/platform.c:762 > platform_device_register_full+0x62d/0x710 drivers/base/platform.c:902 > vhci_hcd_init+0x227/0x360 drivers/usb/usbip/vhci_hcd.c:1557 > do_one_initcall+0x250/0x870 init/main.c:1347 > do_initcall_level+0x10a/0x1a0 init/main.c:1409 > do_initcalls+0x59/0xa0 init/main.c:1425 > kernel_init_freeable+0x29d/0x3e0 init/main.c:1658 > kernel_init+0x1d/0x1d0 init/main.c:1548 > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > Freed by task 5870: > kasan_save_stack mm/kasan/common.c:57 [inline] > kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 > kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 > poison_slab_object mm/kasan/common.c:253 [inline] > __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 > kasan_slab_free include/linux/kasan.h:235 [inline] > slab_free_hook mm/slub.c:2705 [inline] > slab_free mm/slub.c:6405 [inline] > kfree+0x1c5/0x640 mm/slub.c:6720 > vhci_hcd_remove+0xe4/0x110 drivers/usb/usbip/vhci_hcd.c:1434 > device_remove drivers/base/dd.c:616 [inline] > __device_release_driver drivers/base/dd.c:1349 [inline] > device_release_driver_internal+0x48b/0x880 drivers/base/dd.c:1372 > unbind_store+0x1a1/0x1d0 drivers/base/bus.c:244 > kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345 > new_sync_write fs/read_write.c:595 [inline] > vfs_write+0x612/0xba0 fs/read_write.c:687 > ksys_write+0x150/0x270 fs/read_write.c:739 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Last potentially related work creation: > kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 > kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 > insert_work+0x3d/0x330 kernel/workqueue.c:2226 > __queue_work+0xcd8/0x10a0 kernel/workqueue.c:2401 > queue_work_on+0x106/0x1d0 kernel/workqueue.c:2452 > usb_rh_urb_dequeue drivers/usb/core/hcd.c:845 [inline] > unlink1+0x344/0x3e0 drivers/usb/core/hcd.c:1580 > usb_hcd_unlink_urb+0xe6/0x1e0 drivers/usb/core/hcd.c:1617 > usb_kill_urb+0x10b/0x2f0 drivers/usb/core/urb.c:716 > hub_quiesce+0x211/0x330 drivers/usb/core/hub.c:1412 > hub_suspend+0x904/0xad0 drivers/usb/core/hub.c:4008 > usb_suspend_interface drivers/usb/core/driver.c:1323 [inline] > usb_suspend_both+0x285/0x1040 drivers/usb/core/driver.c:1446 > usb_runtime_suspend+0x58/0x110 drivers/usb/core/driver.c:2000 > __rpm_callback+0x2c7/0x950 drivers/base/power/runtime.c:406 > rpm_callback drivers/base/power/runtime.c:460 [inline] > rpm_suspend+0x8a0/0x17b0 drivers/base/power/runtime.c:698 > __pm_runtime_suspend+0x12f/0x1a0 drivers/base/power/runtime.c:1167 > pm_runtime_put_sync_autosuspend include/linux/pm_runtime.h:740 [inline] > usb_new_device+0xadf/0x1620 drivers/usb/core/hub.c:2727 > register_root_hub+0x250/0x5c0 drivers/usb/core/hcd.c:990 > usb_add_hcd+0xac7/0xf80 drivers/usb/core/hcd.c:2987 > vhci_hcd_probe+0x141/0x3e0 drivers/usb/usbip/vhci_hcd.c:1388 > platform_probe+0xf9/0x190 drivers/base/platform.c:1439 > call_driver_probe drivers/base/dd.c:-1 [inline] > really_probe+0x254/0xae0 drivers/base/dd.c:706 > __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 > driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 > __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 > bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 > __device_attach+0x2c4/0x450 drivers/base/dd.c:1098 > device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 > bus_probe_device+0x12a/0x220 drivers/base/bus.c:620 > device_add+0x7d7/0xb80 drivers/base/core.c:3772 > platform_device_add+0x4bd/0x860 drivers/base/platform.c:762 > platform_device_register_full+0x62d/0x710 drivers/base/platform.c:902 > vhci_hcd_init+0x227/0x360 drivers/usb/usbip/vhci_hcd.c:1557 > do_one_initcall+0x250/0x870 init/main.c:1347 > do_initcall_level+0x10a/0x1a0 init/main.c:1409 > do_initcalls+0x59/0xa0 init/main.c:1425 > kernel_init_freeable+0x29d/0x3e0 init/main.c:1658 > kernel_init+0x1d/0x1d0 init/main.c:1548 > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > Second to last potentially related work creation: > kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 > kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 > insert_work+0x3d/0x330 kernel/workqueue.c:2226 > __queue_work+0xcd8/0x10a0 kernel/workqueue.c:2401 > queue_work_on+0x106/0x1d0 kernel/workqueue.c:2452 > rh_call_control drivers/usb/core/hcd.c:706 [inline] > rh_urb_enqueue drivers/usb/core/hcd.c:817 [inline] > usb_hcd_submit_urb+0xa3b/0x1b60 drivers/usb/core/hcd.c:1538 > usb_start_wait_urb+0x13f/0x5b0 drivers/usb/core/message.c:62 > usb_internal_control_msg drivers/usb/core/message.c:117 [inline] > usb_control_msg+0x234/0x3e0 drivers/usb/core/message.c:167 > get_port_status drivers/usb/core/hub.c:607 [inline] > hub_ext_port_status+0x114/0x810 drivers/usb/core/hub.c:624 > usb_hub_port_status drivers/usb/core/hub.c:674 [inline] > hub_activate+0x740/0x1b20 drivers/usb/core/hub.c:1185 > process_one_work kernel/workqueue.c:3322 [inline] > process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 > worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 > kthread+0x388/0x470 kernel/kthread.c:436 > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > The buggy address belongs to the object at ffff88816d3a8000 > which belongs to the cache kmalloc-8k of size 8192 > The buggy address is located 1144 bytes inside of > freed 8192-byte region [ffff88816d3a8000, ffff88816d3aa000) > > The buggy address belongs to the physical page: > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16d3= a8 > head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 > flags: 0x57ff00000000040(head|node=3D1|zone=3D2|lastcpupid=3D0x7ff) > page_type: f5(slab) > raw: 057ff00000000040 ffff888100042280 dead000000000122 0000000000000000 > raw: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000 > head: 057ff00000000040 ffff888100042280 dead000000000122 0000000000000000 > head: 0000000000000000 0000000800020002 00000000f5000000 0000000000000000 > head: 057ff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff > head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 > page dumped because: kasan: bad access detected > page_owner tracks the page as allocated > page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(= __GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), = pid 1, tgid 1 (swapper/0), ts 15263763575, free_ts 0 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 > prep_new_page mm/page_alloc.c:1867 [inline] > get_page_from_freelist+0x21fa/0x2270 mm/page_alloc.c:3946 > __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 > alloc_slab_page mm/slub.c:3294 [inline] > allocate_slab+0x79/0x5e0 mm/slub.c:3408 > new_slab mm/slub.c:3454 [inline] > refill_objects+0x2d5/0x350 mm/slub.c:7338 > refill_sheaf mm/slub.c:2832 [inline] > __pcs_replace_empty_main+0x2bf/0x6b0 mm/slub.c:4703 > alloc_from_pcs mm/slub.c:4801 [inline] > slab_alloc_node mm/slub.c:4933 [inline] > __kmalloc_cache_noprof+0x3a7/0x660 mm/slub.c:5511 > _kmalloc_noprof include/linux/slab.h:969 [inline] > _kzalloc_noprof include/linux/slab.h:1290 [inline] > dummy_hcd_init+0x3e2/0xd00 drivers/usb/gadget/udc/dummy_hcd.c:2836 > do_one_initcall+0x250/0x870 init/main.c:1347 > do_initcall_level+0x10a/0x1a0 init/main.c:1409 > do_initcalls+0x59/0xa0 init/main.c:1425 > kernel_init_freeable+0x29d/0x3e0 init/main.c:1658 > kernel_init+0x1d/0x1d0 init/main.c:1548 > ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > page_owner free stack trace missing > > Memory state around the buggy address: > ffff88816d3a8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88816d3a8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > >ffff88816d3a8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff88816d3a8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88816d3a8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > *** > > 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] haoqinhuang7@= gmail.com [email protected] [email protected] linux-kernel@= vger.kernel.org [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/6a69dcda.d9e86bb5.297b12.0063.GAE%40google.com.