Date
July 23, 2025, 3:10 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.510717] ================================================================== [ 31.510809] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x480/0x4a8 [ 31.510880] Read of size 8 at addr fff00000c9a6bf80 by task kunit_try_catch/233 [ 31.510945] [ 31.510989] CPU: 0 UID: 0 PID: 233 Comm: kunit_try_catch Tainted: G B W N 6.16.0-rc7-next-20250723 #1 PREEMPT [ 31.511082] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 31.511111] Hardware name: linux,dummy-virt (DT) [ 31.511143] Call trace: [ 31.511170] show_stack+0x20/0x38 (C) [ 31.511222] dump_stack_lvl+0x8c/0xd0 [ 31.511269] print_report+0x118/0x5e8 [ 31.511415] kasan_report+0xdc/0x128 [ 31.511563] __asan_report_load8_noabort+0x20/0x30 [ 31.512030] workqueue_uaf+0x480/0x4a8 [ 31.512090] kunit_try_run_case+0x170/0x3f0 [ 31.512247] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.512411] kthread+0x328/0x630 [ 31.512504] ret_from_fork+0x10/0x20 [ 31.512558] [ 31.512577] Allocated by task 233: [ 31.512607] kasan_save_stack+0x3c/0x68 [ 31.512648] kasan_save_track+0x20/0x40 [ 31.512683] kasan_save_alloc_info+0x40/0x58 [ 31.512722] __kasan_kmalloc+0xd4/0xd8 [ 31.513085] __kmalloc_cache_noprof+0x16c/0x3c0 [ 31.513131] workqueue_uaf+0x13c/0x4a8 [ 31.513202] kunit_try_run_case+0x170/0x3f0 [ 31.513249] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.513292] kthread+0x328/0x630 [ 31.513326] ret_from_fork+0x10/0x20 [ 31.513438] [ 31.513459] Freed by task 9: [ 31.513535] kasan_save_stack+0x3c/0x68 [ 31.513574] kasan_save_track+0x20/0x40 [ 31.513609] kasan_save_free_info+0x4c/0x78 [ 31.513646] __kasan_slab_free+0x6c/0x98 [ 31.513682] kfree+0x214/0x3c8 [ 31.513716] workqueue_uaf_work+0x18/0x30 [ 31.513752] process_one_work+0x530/0xf88 [ 31.513792] worker_thread+0x618/0xf38 [ 31.513862] kthread+0x328/0x630 [ 31.513906] ret_from_fork+0x10/0x20 [ 31.513948] [ 31.513966] Last potentially related work creation: [ 31.513993] kasan_save_stack+0x3c/0x68 [ 31.514029] kasan_record_aux_stack+0xb4/0xc8 [ 31.514068] __queue_work+0x65c/0xfe0 [ 31.514105] queue_work_on+0xbc/0xf8 [ 31.514406] workqueue_uaf+0x210/0x4a8 [ 31.514501] kunit_try_run_case+0x170/0x3f0 [ 31.514555] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.514648] kthread+0x328/0x630 [ 31.514681] ret_from_fork+0x10/0x20 [ 31.514717] [ 31.514735] The buggy address belongs to the object at fff00000c9a6bf80 [ 31.514735] which belongs to the cache kmalloc-32 of size 32 [ 31.514967] The buggy address is located 0 bytes inside of [ 31.514967] freed 32-byte region [fff00000c9a6bf80, fff00000c9a6bfa0) [ 31.515176] [ 31.515199] The buggy address belongs to the physical page: [ 31.515238] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109a6b [ 31.515296] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.515574] page_type: f5(slab) [ 31.515691] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000 [ 31.515808] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 31.515894] page dumped because: kasan: bad access detected [ 31.516007] [ 31.516064] Memory state around the buggy address: [ 31.516126] fff00000c9a6be80: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 31.516177] fff00000c9a6bf00: 00 00 00 fc fc fc fc fc 00 00 00 07 fc fc fc fc [ 31.516277] >fff00000c9a6bf80: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc [ 31.516449] ^ [ 31.516490] fff00000c9a6c000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 31.516583] fff00000c9a6c080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 31.516622] ==================================================================
[ 25.811447] ================================================================== [ 25.812532] BUG: KASAN: slab-use-after-free in workqueue_uaf+0x4d6/0x560 [ 25.812777] Read of size 8 at addr ffff888106110ac0 by task kunit_try_catch/249 [ 25.813020] [ 25.813110] CPU: 0 UID: 0 PID: 249 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7-next-20250723 #1 PREEMPT(voluntary) [ 25.813172] Tainted: [B]=BAD_PAGE, [N]=TEST [ 25.813229] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 25.813252] Call Trace: [ 25.813290] <TASK> [ 25.813350] dump_stack_lvl+0x73/0xb0 [ 25.813383] print_report+0xd1/0x640 [ 25.813419] ? __virt_addr_valid+0x1db/0x2d0 [ 25.813445] ? workqueue_uaf+0x4d6/0x560 [ 25.813466] ? kasan_complete_mode_report_info+0x64/0x200 [ 25.813492] ? workqueue_uaf+0x4d6/0x560 [ 25.813513] kasan_report+0x141/0x180 [ 25.813534] ? workqueue_uaf+0x4d6/0x560 [ 25.813560] __asan_report_load8_noabort+0x18/0x20 [ 25.813584] workqueue_uaf+0x4d6/0x560 [ 25.813606] ? __pfx_workqueue_uaf+0x10/0x10 [ 25.813628] ? __schedule+0x10da/0x2b60 [ 25.813654] ? __pfx_read_tsc+0x10/0x10 [ 25.813676] ? ktime_get_ts64+0x86/0x230 [ 25.813702] kunit_try_run_case+0x1a5/0x480 [ 25.813729] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.813785] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 25.813825] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 25.813875] ? __kthread_parkme+0x82/0x180 [ 25.813896] ? preempt_count_sub+0x50/0x80 [ 25.813920] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.813965] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.813989] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 25.814012] kthread+0x337/0x6f0 [ 25.814032] ? trace_preempt_on+0x20/0xc0 [ 25.814057] ? __pfx_kthread+0x10/0x10 [ 25.814078] ? _raw_spin_unlock_irq+0x47/0x80 [ 25.814101] ? calculate_sigpending+0x7b/0xa0 [ 25.814126] ? __pfx_kthread+0x10/0x10 [ 25.814156] ret_from_fork+0x116/0x1d0 [ 25.814176] ? __pfx_kthread+0x10/0x10 [ 25.814197] ret_from_fork_asm+0x1a/0x30 [ 25.814229] </TASK> [ 25.814241] [ 25.825110] Allocated by task 249: [ 25.825307] kasan_save_stack+0x45/0x70 [ 25.825894] kasan_save_track+0x18/0x40 [ 25.826100] kasan_save_alloc_info+0x3b/0x50 [ 25.826424] __kasan_kmalloc+0xb7/0xc0 [ 25.826717] __kmalloc_cache_noprof+0x189/0x420 [ 25.827038] workqueue_uaf+0x152/0x560 [ 25.827340] kunit_try_run_case+0x1a5/0x480 [ 25.827895] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.828309] kthread+0x337/0x6f0 [ 25.828628] ret_from_fork+0x116/0x1d0 [ 25.828822] ret_from_fork_asm+0x1a/0x30 [ 25.829031] [ 25.829484] Freed by task 9: [ 25.829619] kasan_save_stack+0x45/0x70 [ 25.829845] kasan_save_track+0x18/0x40 [ 25.830082] kasan_save_free_info+0x3f/0x60 [ 25.830597] __kasan_slab_free+0x56/0x70 [ 25.830764] kfree+0x222/0x3f0 [ 25.831089] workqueue_uaf_work+0x12/0x20 [ 25.831401] process_one_work+0x5ee/0xf60 [ 25.831794] worker_thread+0x758/0x1220 [ 25.832192] kthread+0x337/0x6f0 [ 25.832664] ret_from_fork+0x116/0x1d0 [ 25.832853] ret_from_fork_asm+0x1a/0x30 [ 25.833251] [ 25.833333] Last potentially related work creation: [ 25.833767] kasan_save_stack+0x45/0x70 [ 25.834129] kasan_record_aux_stack+0xb2/0xc0 [ 25.834557] __queue_work+0x61a/0xe70 [ 25.834857] queue_work_on+0xb6/0xc0 [ 25.835162] workqueue_uaf+0x26d/0x560 [ 25.835355] kunit_try_run_case+0x1a5/0x480 [ 25.835662] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.835914] kthread+0x337/0x6f0 [ 25.836310] ret_from_fork+0x116/0x1d0 [ 25.836461] ret_from_fork_asm+0x1a/0x30 [ 25.836824] [ 25.836923] The buggy address belongs to the object at ffff888106110ac0 [ 25.836923] which belongs to the cache kmalloc-32 of size 32 [ 25.837958] The buggy address is located 0 bytes inside of [ 25.837958] freed 32-byte region [ffff888106110ac0, ffff888106110ae0) [ 25.838580] [ 25.838712] The buggy address belongs to the physical page: [ 25.839223] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106110 [ 25.839772] flags: 0x200000000000000(node=0|zone=2) [ 25.840053] page_type: f5(slab) [ 25.840457] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000 [ 25.840858] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000 [ 25.841324] page dumped because: kasan: bad access detected [ 25.841704] [ 25.841805] Memory state around the buggy address: [ 25.842065] ffff888106110980: 00 00 07 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 25.842342] ffff888106110a00: 00 00 03 fc fc fc fc fc 00 00 07 fc fc fc fc fc [ 25.843312] >ffff888106110a80: 00 00 00 07 fc fc fc fc fa fb fb fb fc fc fc fc [ 25.843647] ^ [ 25.844105] ffff888106110b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.844511] ffff888106110b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.845014] ==================================================================