[   50.226141] ==================================================================
[   50.227131] BUG: KASAN: slab-use-after-free in strchr+0x18/0x60
[   50.227825] Read of size 1 at addr ffff8881028cedd0 by task kunit_try_catch/222
[   50.228475] 
[   50.229902] CPU: 1 PID: 222 Comm: kunit_try_catch Tainted: G    B            N 6.6.76-rc1 #1
[   50.231280] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   50.231941] Call Trace:
[   50.232272]  <TASK>
[   50.233333]  dump_stack_lvl+0x4e/0x90
[   50.234045]  print_report+0xd2/0x660
[   50.234613]  ? __virt_addr_valid+0x156/0x1e0
[   50.235474]  ? kasan_complete_mode_report_info+0x64/0x200
[   50.236334]  kasan_report+0xff/0x140
[   50.236814]  ? strchr+0x18/0x60
[   50.237543]  ? strchr+0x18/0x60
[   50.237958]  __asan_load1+0x66/0x70
[   50.238572]  strchr+0x18/0x60
[   50.239169]  kasan_strings+0xdf/0x510
[   50.240011]  ? __pfx_kasan_strings+0x10/0x10
[   50.240617]  ? __schedule+0x70b/0x1190
[   50.241359]  ? ktime_get_ts64+0x118/0x140
[   50.242098]  kunit_try_run_case+0x126/0x290
[   50.243037]  ? __pfx_kunit_try_run_case+0x10/0x10
[   50.243595]  ? __kasan_check_write+0x18/0x20
[   50.244476]  ? trace_preempt_on+0x20/0xa0
[   50.245203]  ? __kthread_parkme+0x4f/0xd0
[   50.245763]  ? preempt_count_sub+0x50/0x80
[   50.246362]  ? __pfx_kunit_try_run_case+0x10/0x10
[   50.247065]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   50.247972]  kunit_generic_run_threadfn_adapter+0x33/0x50
[   50.249077]  kthread+0x19e/0x1e0
[   50.249633]  ? __pfx_kthread+0x10/0x10
[   50.250404]  ret_from_fork+0x41/0x70
[   50.251171]  ? __pfx_kthread+0x10/0x10
[   50.251904]  ret_from_fork_asm+0x1b/0x30
[   50.252576]  </TASK>
[   50.252904] 
[   50.253660] Allocated by task 222:
[   50.254349]  kasan_save_stack+0x3c/0x60
[   50.255129]  kasan_set_track+0x29/0x40
[   50.255614]  kasan_save_alloc_info+0x22/0x30
[   50.256328]  __kasan_kmalloc+0xb7/0xc0
[   50.256923]  kmalloc_trace+0x4c/0xb0
[   50.257706]  kasan_strings+0x9f/0x510
[   50.258810]  kunit_try_run_case+0x126/0x290
[   50.259626]  kunit_generic_run_threadfn_adapter+0x33/0x50
[   50.260543]  kthread+0x19e/0x1e0
[   50.261119]  ret_from_fork+0x41/0x70
[   50.262364]  ret_from_fork_asm+0x1b/0x30
[   50.263053] 
[   50.263361] Freed by task 222:
[   50.264243]  kasan_save_stack+0x3c/0x60
[   50.264960]  kasan_set_track+0x29/0x40
[   50.265438]  kasan_save_free_info+0x2f/0x50
[   50.266374]  ____kasan_slab_free+0x172/0x1d0
[   50.266869]  __kasan_slab_free+0x16/0x20
[   50.267509]  __kmem_cache_free+0x190/0x310
[   50.268110]  kfree+0x7c/0x120
[   50.268569]  kasan_strings+0xc3/0x510
[   50.269034]  kunit_try_run_case+0x126/0x290
[   50.269619]  kunit_generic_run_threadfn_adapter+0x33/0x50
[   50.271392]  kthread+0x19e/0x1e0
[   50.271797]  ret_from_fork+0x41/0x70
[   50.272322]  ret_from_fork_asm+0x1b/0x30
[   50.272906] 
[   50.273315] The buggy address belongs to the object at ffff8881028cedc0
[   50.273315]  which belongs to the cache kmalloc-32 of size 32
[   50.274576] The buggy address is located 16 bytes inside of
[   50.274576]  freed 32-byte region [ffff8881028cedc0, ffff8881028cede0)
[   50.276530] 
[   50.276847] The buggy address belongs to the physical page:
[   50.277340] page:(____ptrval____) refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1028ce
[   50.278661] flags: 0x200000000000800(slab|node=0|zone=2)
[   50.279404] page_type: 0xffffffff()
[   50.280467] raw: 0200000000000800 ffff888100041500 dead000000000122 0000000000000000
[   50.281268] raw: 0000000000000000 0000000080400040 00000001ffffffff 0000000000000000
[   50.282068] page dumped because: kasan: bad access detected
[   50.282446] 
[   50.282710] Memory state around the buggy address:
[   50.283473]  ffff8881028cec80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   50.284534]  ffff8881028ced00: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   50.285459] >ffff8881028ced80: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   50.286213]                                                  ^
[   50.286803]  ffff8881028cee00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   50.287671]  ffff8881028cee80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   50.288580] ==================================================================