[   11.923184] ==================================================================
[   11.924253] BUG: KASAN: slab-use-after-free in kmalloc_uaf2+0x4a8/0x520
[   11.924682] Read of size 1 at addr ffff8881027cbfa8 by task kunit_try_catch/205
[   11.925428] 
[   11.925799] CPU: 1 UID: 0 PID: 205 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   11.925850] Tainted: [B]=BAD_PAGE, [N]=TEST
[   11.925862] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   11.925883] Call Trace:
[   11.925895]  <TASK>
[   11.925914]  dump_stack_lvl+0x73/0xb0
[   11.925945]  print_report+0xd1/0x650
[   11.925968]  ? __virt_addr_valid+0x1db/0x2d0
[   11.925992]  ? kmalloc_uaf2+0x4a8/0x520
[   11.926011]  ? kasan_complete_mode_report_info+0x64/0x200
[   11.926046]  ? kmalloc_uaf2+0x4a8/0x520
[   11.926065]  kasan_report+0x141/0x180
[   11.926086]  ? kmalloc_uaf2+0x4a8/0x520
[   11.926109]  __asan_report_load1_noabort+0x18/0x20
[   11.926132]  kmalloc_uaf2+0x4a8/0x520
[   11.926151]  ? __pfx_kmalloc_uaf2+0x10/0x10
[   11.926169]  ? finish_task_switch.isra.0+0x153/0x700
[   11.926191]  ? __switch_to+0x47/0xf50
[   11.926218]  ? __schedule+0x10cc/0x2b60
[   11.926239]  ? __pfx_read_tsc+0x10/0x10
[   11.926260]  ? ktime_get_ts64+0x86/0x230
[   11.926283]  kunit_try_run_case+0x1a5/0x480
[   11.926306]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.926328]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   11.926350]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   11.926371]  ? __kthread_parkme+0x82/0x180
[   11.926391]  ? preempt_count_sub+0x50/0x80
[   11.926412]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.926434]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.926456]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   11.926477]  kthread+0x337/0x6f0
[   11.926495]  ? trace_preempt_on+0x20/0xc0
[   11.926518]  ? __pfx_kthread+0x10/0x10
[   11.926537]  ? _raw_spin_unlock_irq+0x47/0x80
[   11.926556]  ? calculate_sigpending+0x7b/0xa0
[   11.926579]  ? __pfx_kthread+0x10/0x10
[   11.926599]  ret_from_fork+0x116/0x1d0
[   11.926616]  ? __pfx_kthread+0x10/0x10
[   11.926636]  ret_from_fork_asm+0x1a/0x30
[   11.926666]  </TASK>
[   11.926678] 
[   11.941155] Allocated by task 205:
[   11.941352]  kasan_save_stack+0x45/0x70
[   11.941504]  kasan_save_track+0x18/0x40
[   11.941682]  kasan_save_alloc_info+0x3b/0x50
[   11.942099]  __kasan_kmalloc+0xb7/0xc0
[   11.942446]  __kmalloc_cache_noprof+0x189/0x420
[   11.942941]  kmalloc_uaf2+0xc6/0x520
[   11.943288]  kunit_try_run_case+0x1a5/0x480
[   11.943823]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.944018]  kthread+0x337/0x6f0
[   11.944162]  ret_from_fork+0x116/0x1d0
[   11.944294]  ret_from_fork_asm+0x1a/0x30
[   11.944433] 
[   11.944503] Freed by task 205:
[   11.944614]  kasan_save_stack+0x45/0x70
[   11.945299]  kasan_save_track+0x18/0x40
[   11.945691]  kasan_save_free_info+0x3f/0x60
[   11.946180]  __kasan_slab_free+0x56/0x70
[   11.946530]  kfree+0x222/0x3f0
[   11.946850]  kmalloc_uaf2+0x14c/0x520
[   11.947250]  kunit_try_run_case+0x1a5/0x480
[   11.947787]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.948290]  kthread+0x337/0x6f0
[   11.948596]  ret_from_fork+0x116/0x1d0
[   11.949061]  ret_from_fork_asm+0x1a/0x30
[   11.949410] 
[   11.949482] The buggy address belongs to the object at ffff8881027cbf80
[   11.949482]  which belongs to the cache kmalloc-64 of size 64
[   11.949941] The buggy address is located 40 bytes inside of
[   11.949941]  freed 64-byte region [ffff8881027cbf80, ffff8881027cbfc0)
[   11.951167] 
[   11.951333] The buggy address belongs to the physical page:
[   11.951847] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1027cb
[   11.952668] flags: 0x200000000000000(node=0|zone=2)
[   11.952976] page_type: f5(slab)
[   11.953117] raw: 0200000000000000 ffff8881000418c0 dead000000000122 0000000000000000
[   11.953350] raw: 0000000000000000 0000000000200020 00000000f5000000 0000000000000000
[   11.953577] page dumped because: kasan: bad access detected
[   11.954087] 
[   11.954245] Memory state around the buggy address:
[   11.954719]  ffff8881027cbe80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   11.955327]  ffff8881027cbf00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   11.956260] >ffff8881027cbf80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[   11.956482]                                   ^
[   11.956696]  ffff8881027cc000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   11.957479]  ffff8881027cc080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   11.958306] ==================================================================