Date
July 22, 2025, 5:13 a.m.
| Environment | |
|---|---|
| qemu-arm64 | |
| qemu-x86_64 |
[ 31.366773] ================================================================== [ 31.366887] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x388/0x468 [ 31.366975] Read of size 1 at addr fff00000c9234000 by task kunit_try_catch/244 [ 31.367037] [ 31.367091] CPU: 1 UID: 0 PID: 244 Comm: kunit_try_catch Tainted: G B W N 6.16.0-rc7-next-20250722 #1 PREEMPT [ 31.367185] Tainted: [B]=BAD_PAGE, [W]=WARN, [N]=TEST [ 31.367214] Hardware name: linux,dummy-virt (DT) [ 31.367258] Call trace: [ 31.367285] show_stack+0x20/0x38 (C) [ 31.367339] dump_stack_lvl+0x8c/0xd0 [ 31.367390] print_report+0x118/0x5e8 [ 31.367434] kasan_report+0xdc/0x128 [ 31.367718] __asan_report_load1_noabort+0x20/0x30 [ 31.368158] kmem_cache_rcu_uaf+0x388/0x468 [ 31.368247] kunit_try_run_case+0x170/0x3f0 [ 31.369107] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.369169] kthread+0x328/0x630 [ 31.369215] ret_from_fork+0x10/0x20 [ 31.371840] [ 31.371869] Allocated by task 244: [ 31.371903] kasan_save_stack+0x3c/0x68 [ 31.371952] kasan_save_track+0x20/0x40 [ 31.371987] kasan_save_alloc_info+0x40/0x58 [ 31.372026] __kasan_slab_alloc+0xa8/0xb0 [ 31.372060] kmem_cache_alloc_noprof+0x10c/0x398 [ 31.372102] kmem_cache_rcu_uaf+0x12c/0x468 [ 31.372141] kunit_try_run_case+0x170/0x3f0 [ 31.372178] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.372221] kthread+0x328/0x630 [ 31.372254] ret_from_fork+0x10/0x20 [ 31.372291] [ 31.372309] Freed by task 0: [ 31.372337] kasan_save_stack+0x3c/0x68 [ 31.372373] kasan_save_track+0x20/0x40 [ 31.372407] kasan_save_free_info+0x4c/0x78 [ 31.372445] __kasan_slab_free+0x6c/0x98 [ 31.372478] slab_free_after_rcu_debug+0xd4/0x2f8 [ 31.372520] rcu_core+0x9f4/0x1e58 [ 31.372558] rcu_core_si+0x18/0x30 [ 31.372593] handle_softirqs+0x374/0xb28 [ 31.372633] __do_softirq+0x1c/0x28 [ 31.372667] [ 31.372686] Last potentially related work creation: [ 31.372712] kasan_save_stack+0x3c/0x68 [ 31.372748] kasan_record_aux_stack+0xb4/0xc8 [ 31.372786] kmem_cache_free+0x120/0x468 [ 31.372834] kmem_cache_rcu_uaf+0x16c/0x468 [ 31.372883] kunit_try_run_case+0x170/0x3f0 [ 31.372996] kunit_generic_run_threadfn_adapter+0x88/0x100 [ 31.373040] kthread+0x328/0x630 [ 31.373072] ret_from_fork+0x10/0x20 [ 31.373301] [ 31.373322] The buggy address belongs to the object at fff00000c9234000 [ 31.373322] which belongs to the cache test_cache of size 200 [ 31.373384] The buggy address is located 0 bytes inside of [ 31.373384] freed 200-byte region [fff00000c9234000, fff00000c92340c8) [ 31.373444] [ 31.373466] The buggy address belongs to the physical page: [ 31.373595] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x109234 [ 31.373750] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) [ 31.373903] page_type: f5(slab) [ 31.374003] raw: 0bfffe0000000000 fff00000c3f36b40 dead000000000122 0000000000000000 [ 31.374055] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000 [ 31.374141] page dumped because: kasan: bad access detected [ 31.374295] [ 31.374319] Memory state around the buggy address: [ 31.374353] fff00000c9233f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 31.374690] fff00000c9233f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 31.374735] >fff00000c9234000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.374773] ^ [ 31.374801] fff00000c9234080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc [ 31.374852] fff00000c9234100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.374931] ==================================================================
[ 25.891809] ================================================================== [ 25.892313] BUG: KASAN: slab-use-after-free in kmem_cache_rcu_uaf+0x3e3/0x510 [ 25.892661] Read of size 1 at addr ffff8881058a0000 by task kunit_try_catch/261 [ 25.892964] [ 25.893057] CPU: 1 UID: 0 PID: 261 Comm: kunit_try_catch Tainted: G B N 6.16.0-rc7-next-20250722 #1 PREEMPT(voluntary) [ 25.893109] Tainted: [B]=BAD_PAGE, [N]=TEST [ 25.893122] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 25.893146] Call Trace: [ 25.893160] <TASK> [ 25.893177] dump_stack_lvl+0x73/0xb0 [ 25.893209] print_report+0xd1/0x640 [ 25.893232] ? __virt_addr_valid+0x1db/0x2d0 [ 25.893258] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 25.893281] ? kasan_complete_mode_report_info+0x64/0x200 [ 25.893307] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 25.893331] kasan_report+0x141/0x180 [ 25.893353] ? kmem_cache_rcu_uaf+0x3e3/0x510 [ 25.893381] __asan_report_load1_noabort+0x18/0x20 [ 25.893406] kmem_cache_rcu_uaf+0x3e3/0x510 [ 25.893429] ? __pfx_kmem_cache_rcu_uaf+0x10/0x10 [ 25.893452] ? finish_task_switch.isra.0+0x153/0x700 [ 25.893475] ? __switch_to+0x47/0xf80 [ 25.893505] ? __pfx_read_tsc+0x10/0x10 [ 25.893527] ? ktime_get_ts64+0x86/0x230 [ 25.893554] kunit_try_run_case+0x1a5/0x480 [ 25.893580] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.893603] ? _raw_spin_lock_irqsave+0xa1/0x100 [ 25.893630] ? _raw_spin_unlock_irqrestore+0x5f/0x90 [ 25.893655] ? __kthread_parkme+0x82/0x180 [ 25.893676] ? preempt_count_sub+0x50/0x80 [ 25.893699] ? __pfx_kunit_try_run_case+0x10/0x10 [ 25.893723] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.893747] ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [ 25.893771] kthread+0x337/0x6f0 [ 25.893791] ? trace_preempt_on+0x20/0xc0 [ 25.893817] ? __pfx_kthread+0x10/0x10 [ 25.893880] ? _raw_spin_unlock_irq+0x47/0x80 [ 25.893906] ? calculate_sigpending+0x7b/0xa0 [ 25.893931] ? __pfx_kthread+0x10/0x10 [ 25.893978] ret_from_fork+0x116/0x1d0 [ 25.893999] ? __pfx_kthread+0x10/0x10 [ 25.894020] ret_from_fork_asm+0x1a/0x30 [ 25.894052] </TASK> [ 25.894064] [ 25.902925] Allocated by task 261: [ 25.903328] kasan_save_stack+0x45/0x70 [ 25.903606] kasan_save_track+0x18/0x40 [ 25.903753] kasan_save_alloc_info+0x3b/0x50 [ 25.903969] __kasan_slab_alloc+0x91/0xa0 [ 25.904170] kmem_cache_alloc_noprof+0x123/0x3f0 [ 25.904548] kmem_cache_rcu_uaf+0x155/0x510 [ 25.904755] kunit_try_run_case+0x1a5/0x480 [ 25.904989] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.905219] kthread+0x337/0x6f0 [ 25.905388] ret_from_fork+0x116/0x1d0 [ 25.905599] ret_from_fork_asm+0x1a/0x30 [ 25.905742] [ 25.905810] Freed by task 0: [ 25.905954] kasan_save_stack+0x45/0x70 [ 25.906146] kasan_save_track+0x18/0x40 [ 25.906490] kasan_save_free_info+0x3f/0x60 [ 25.906673] __kasan_slab_free+0x56/0x70 [ 25.906813] slab_free_after_rcu_debug+0xe4/0x310 [ 25.907048] rcu_core+0x66f/0x1c40 [ 25.907435] rcu_core_si+0x12/0x20 [ 25.907723] handle_softirqs+0x209/0x730 [ 25.907895] __irq_exit_rcu+0xc9/0x110 [ 25.908106] irq_exit_rcu+0x12/0x20 [ 25.908341] sysvec_apic_timer_interrupt+0x81/0x90 [ 25.908599] asm_sysvec_apic_timer_interrupt+0x1f/0x30 [ 25.908915] [ 25.909013] Last potentially related work creation: [ 25.909260] kasan_save_stack+0x45/0x70 [ 25.909447] kasan_record_aux_stack+0xb2/0xc0 [ 25.909647] kmem_cache_free+0x131/0x420 [ 25.909787] kmem_cache_rcu_uaf+0x194/0x510 [ 25.910024] kunit_try_run_case+0x1a5/0x480 [ 25.910229] kunit_generic_run_threadfn_adapter+0x85/0xf0 [ 25.910562] kthread+0x337/0x6f0 [ 25.910824] ret_from_fork+0x116/0x1d0 [ 25.911027] ret_from_fork_asm+0x1a/0x30 [ 25.911723] [ 25.911827] The buggy address belongs to the object at ffff8881058a0000 [ 25.911827] which belongs to the cache test_cache of size 200 [ 25.912808] The buggy address is located 0 bytes inside of [ 25.912808] freed 200-byte region [ffff8881058a0000, ffff8881058a00c8) [ 25.913689] [ 25.913814] The buggy address belongs to the physical page: [ 25.914057] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1058a0 [ 25.915158] flags: 0x200000000000000(node=0|zone=2) [ 25.915560] page_type: f5(slab) [ 25.915734] raw: 0200000000000000 ffff888101d72640 dead000000000122 0000000000000000 [ 25.916058] raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000 [ 25.916857] page dumped because: kasan: bad access detected [ 25.917320] [ 25.917413] Memory state around the buggy address: [ 25.917905] ffff88810589ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 25.918454] ffff88810589ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 25.919156] >ffff8881058a0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.919725] ^ [ 25.919998] ffff8881058a0080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc [ 25.920687] ffff8881058a0100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.921004] ==================================================================