[   11.855953] ==================================================================
[   11.856481] BUG: KASAN: slab-use-after-free in kmalloc_uaf+0x320/0x380
[   11.856977] Read of size 1 at addr ffff8881021d56e8 by task kunit_try_catch/201
[   11.857371] 
[   11.857472] CPU: 0 UID: 0 PID: 201 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   11.857856] Tainted: [B]=BAD_PAGE, [N]=TEST
[   11.857871] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   11.857892] Call Trace:
[   11.857906]  <TASK>
[   11.857925]  dump_stack_lvl+0x73/0xb0
[   11.857957]  print_report+0xd1/0x650
[   11.857979]  ? __virt_addr_valid+0x1db/0x2d0
[   11.858002]  ? kmalloc_uaf+0x320/0x380
[   11.858035]  ? kasan_complete_mode_report_info+0x64/0x200
[   11.858056]  ? kmalloc_uaf+0x320/0x380
[   11.858075]  kasan_report+0x141/0x180
[   11.858096]  ? kmalloc_uaf+0x320/0x380
[   11.858119]  __asan_report_load1_noabort+0x18/0x20
[   11.858142]  kmalloc_uaf+0x320/0x380
[   11.858160]  ? __pfx_kmalloc_uaf+0x10/0x10
[   11.858179]  ? __schedule+0x10cc/0x2b60
[   11.858201]  ? __pfx_read_tsc+0x10/0x10
[   11.858222]  ? ktime_get_ts64+0x86/0x230
[   11.858245]  kunit_try_run_case+0x1a5/0x480
[   11.858268]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.858289]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   11.858311]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   11.858332]  ? __kthread_parkme+0x82/0x180
[   11.858351]  ? preempt_count_sub+0x50/0x80
[   11.858374]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.858396]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.858417]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   11.858439]  kthread+0x337/0x6f0
[   11.858456]  ? trace_preempt_on+0x20/0xc0
[   11.858479]  ? __pfx_kthread+0x10/0x10
[   11.858499]  ? _raw_spin_unlock_irq+0x47/0x80
[   11.858518]  ? calculate_sigpending+0x7b/0xa0
[   11.858540]  ? __pfx_kthread+0x10/0x10
[   11.858560]  ret_from_fork+0x116/0x1d0
[   11.858577]  ? __pfx_kthread+0x10/0x10
[   11.858597]  ret_from_fork_asm+0x1a/0x30
[   11.858627]  </TASK>
[   11.858801] 
[   11.867875] Allocated by task 201:
[   11.868203]  kasan_save_stack+0x45/0x70
[   11.868405]  kasan_save_track+0x18/0x40
[   11.868579]  kasan_save_alloc_info+0x3b/0x50
[   11.868963]  __kasan_kmalloc+0xb7/0xc0
[   11.869160]  __kmalloc_cache_noprof+0x189/0x420
[   11.869490]  kmalloc_uaf+0xaa/0x380
[   11.869677]  kunit_try_run_case+0x1a5/0x480
[   11.869955]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.870295]  kthread+0x337/0x6f0
[   11.870463]  ret_from_fork+0x116/0x1d0
[   11.870634]  ret_from_fork_asm+0x1a/0x30
[   11.870805] 
[   11.870903] Freed by task 201:
[   11.871283]  kasan_save_stack+0x45/0x70
[   11.871510]  kasan_save_track+0x18/0x40
[   11.871819]  kasan_save_free_info+0x3f/0x60
[   11.872019]  __kasan_slab_free+0x56/0x70
[   11.872348]  kfree+0x222/0x3f0
[   11.872518]  kmalloc_uaf+0x12c/0x380
[   11.872778]  kunit_try_run_case+0x1a5/0x480
[   11.873045]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.873280]  kthread+0x337/0x6f0
[   11.873433]  ret_from_fork+0x116/0x1d0
[   11.873604]  ret_from_fork_asm+0x1a/0x30
[   11.874046] 
[   11.874138] The buggy address belongs to the object at ffff8881021d56e0
[   11.874138]  which belongs to the cache kmalloc-16 of size 16
[   11.874788] The buggy address is located 8 bytes inside of
[   11.874788]  freed 16-byte region [ffff8881021d56e0, ffff8881021d56f0)
[   11.875387] 
[   11.875627] The buggy address belongs to the physical page:
[   11.875912] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1021d5
[   11.876329] flags: 0x200000000000000(node=0|zone=2)
[   11.876617] page_type: f5(slab)
[   11.876758] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000
[   11.877089] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000
[   11.877410] page dumped because: kasan: bad access detected
[   11.877641] 
[   11.877740] Memory state around the buggy address:
[   11.878250]  ffff8881021d5580: 00 00 fc fc 00 02 fc fc 00 02 fc fc 00 06 fc fc
[   11.878625]  ffff8881021d5600: 00 06 fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   11.878983] >ffff8881021d5680: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   11.879381]                                                           ^
[   11.879787]  ffff8881021d5700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   11.880088]  ffff8881021d5780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   11.880522] ==================================================================