Hay
Date
May 15, 2025, 10:38 a.m.

Environment
e850-96

[   40.548846] ==================================================================
[   40.555938] BUG: KASAN: slab-use-after-free in kasan_strings+0x95c/0xb00
[   40.562617] Read of size 1 at addr ffff0008065c9310 by task kunit_try_catch/304
[   40.569909] 
[   40.571393] CPU: 6 UID: 0 PID: 304 Comm: kunit_try_catch Tainted: G    B            N  6.15.0-rc6-next-20250515 #1 PREEMPT 
[   40.571449] Tainted: [B]=BAD_PAGE, [N]=TEST
[   40.571469] Hardware name: WinLink E850-96 board (DT)
[   40.571490] Call trace:
[   40.571504]  show_stack+0x20/0x38 (C)
[   40.571542]  dump_stack_lvl+0x8c/0xd0
[   40.571573]  print_report+0x118/0x608
[   40.571605]  kasan_report+0xdc/0x128
[   40.571635]  __asan_report_load1_noabort+0x20/0x30
[   40.571672]  kasan_strings+0x95c/0xb00
[   40.571700]  kunit_try_run_case+0x170/0x3f0
[   40.571732]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   40.571768]  kthread+0x328/0x630
[   40.571803]  ret_from_fork+0x10/0x20
[   40.571838] 
[   40.635011] Allocated by task 304:
[   40.638399]  kasan_save_stack+0x3c/0x68
[   40.642217]  kasan_save_track+0x20/0x40
[   40.646036]  kasan_save_alloc_info+0x40/0x58
[   40.650289]  __kasan_kmalloc+0xd4/0xd8
[   40.654022]  __kmalloc_cache_noprof+0x15c/0x3c0
[   40.658536]  kasan_strings+0xc8/0xb00
[   40.662181]  kunit_try_run_case+0x170/0x3f0
[   40.666348]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   40.671817]  kthread+0x328/0x630
[   40.675028]  ret_from_fork+0x10/0x20
[   40.678587] 
[   40.680063] Freed by task 304:
[   40.683103]  kasan_save_stack+0x3c/0x68
[   40.686920]  kasan_save_track+0x20/0x40
[   40.690740]  kasan_save_free_info+0x4c/0x78
[   40.694907]  __kasan_slab_free+0x6c/0x98
[   40.698813]  kfree+0x214/0x3c8
[   40.701851]  kasan_strings+0x24c/0xb00
[   40.705583]  kunit_try_run_case+0x170/0x3f0
[   40.709750]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   40.715219]  kthread+0x328/0x630
[   40.718431]  ret_from_fork+0x10/0x20
[   40.721990] 
[   40.723465] The buggy address belongs to the object at ffff0008065c9300
[   40.723465]  which belongs to the cache kmalloc-32 of size 32
[   40.735793] The buggy address is located 16 bytes inside of
[   40.735793]  freed 32-byte region [ffff0008065c9300, ffff0008065c9320)
[   40.747857] 
[   40.749336] The buggy address belongs to the physical page:
[   40.754892] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8865c9
[   40.762874] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   40.769385] page_type: f5(slab)
[   40.772521] raw: 0bfffe0000000000 ffff000800002780 dead000000000122 0000000000000000
[   40.780242] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   40.787962] page dumped because: kasan: bad access detected
[   40.793516] 
[   40.794992] Memory state around the buggy address:
[   40.799772]  ffff0008065c9200: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   40.806975]  ffff0008065c9280: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   40.814181] >ffff0008065c9300: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   40.821380]                          ^
[   40.825117]  ffff0008065c9380: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
[   40.832321]  ffff0008065c9400: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   40.839525] ==================================================================