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Date
June 26, 2025, 11:12 a.m.

Environment
e850-96
qemu-arm64
qemu-x86_64 

[   40.167440] ==================================================================
[   40.191005] BUG: KASAN: slab-use-after-free in strcmp+0xc0/0xc8
[   40.196903] Read of size 1 at addr ffff0008066bd2d0 by task kunit_try_catch/308
[   40.204196] 
[   40.205681] CPU: 7 UID: 0 PID: 308 Comm: kunit_try_catch Tainted: G    B            N  6.15.4-rc3 #1 PREEMPT 
[   40.205741] Tainted: [B]=BAD_PAGE, [N]=TEST
[   40.205761] Hardware name: WinLink E850-96 board (DT)
[   40.205784] Call trace:
[   40.205799]  show_stack+0x20/0x38 (C)
[   40.205836]  dump_stack_lvl+0x8c/0xd0
[   40.205876]  print_report+0x118/0x608
[   40.205912]  kasan_report+0xdc/0x128
[   40.205944]  __asan_report_load1_noabort+0x20/0x30
[   40.205982]  strcmp+0xc0/0xc8
[   40.206014]  kasan_strings+0x340/0xb00
[   40.206049]  kunit_try_run_case+0x170/0x3f0
[   40.206090]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   40.206132]  kthread+0x328/0x630
[   40.206171]  ret_from_fork+0x10/0x20
[   40.206209] 
[   40.271033] Allocated by task 308:
[   40.274423]  kasan_save_stack+0x3c/0x68
[   40.278238]  kasan_save_track+0x20/0x40
[   40.282057]  kasan_save_alloc_info+0x40/0x58
[   40.286311]  __kasan_kmalloc+0xd4/0xd8
[   40.290045]  __kmalloc_cache_noprof+0x16c/0x3c0
[   40.294557]  kasan_strings+0xc8/0xb00
[   40.298203]  kunit_try_run_case+0x170/0x3f0
[   40.302370]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   40.307838]  kthread+0x328/0x630
[   40.311050]  ret_from_fork+0x10/0x20
[   40.314609] 
[   40.316084] Freed by task 308:
[   40.319125]  kasan_save_stack+0x3c/0x68
[   40.322942]  kasan_save_track+0x20/0x40
[   40.326763]  kasan_save_free_info+0x4c/0x78
[   40.330928]  __kasan_slab_free+0x6c/0x98
[   40.334835]  kfree+0x214/0x3c8
[   40.337873]  kasan_strings+0x24c/0xb00
[   40.341605]  kunit_try_run_case+0x170/0x3f0
[   40.345772]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   40.351241]  kthread+0x328/0x630
[   40.354454]  ret_from_fork+0x10/0x20
[   40.358011] 
[   40.359488] The buggy address belongs to the object at ffff0008066bd2c0
[   40.359488]  which belongs to the cache kmalloc-32 of size 32
[   40.371816] The buggy address is located 16 bytes inside of
[   40.371816]  freed 32-byte region [ffff0008066bd2c0, ffff0008066bd2e0)
[   40.383879] 
[   40.385359] The buggy address belongs to the physical page:
[   40.390914] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8866bd
[   40.398898] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   40.405408] page_type: f5(slab)
[   40.408546] raw: 0bfffe0000000000 ffff000800002780 dead000000000122 0000000000000000
[   40.416264] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   40.423983] page dumped because: kasan: bad access detected
[   40.429539] 
[   40.431015] Memory state around the buggy address:
[   40.435795]  ffff0008066bd180: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   40.442996]  ffff0008066bd200: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   40.450203] >ffff0008066bd280: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   40.457402]                                                  ^
[   40.463222]  ffff0008066bd300: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   40.470426]  ffff0008066bd380: 00 00 00 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   40.477629] ==================================================================
Metadata Full log Test run details 

[   20.294801] ==================================================================
[   20.294883] BUG: KASAN: slab-use-after-free in strcmp+0xc0/0xc8
[   20.294991] Read of size 1 at addr fff00000c5be7090 by task kunit_try_catch/261
[   20.295074] 
[   20.295202] CPU: 1 UID: 0 PID: 261 Comm: kunit_try_catch Tainted: G    B            N  6.15.4-rc3 #1 PREEMPT 
[   20.295310] Tainted: [B]=BAD_PAGE, [N]=TEST
[   20.295350] Hardware name: linux,dummy-virt (DT)
[   20.295449] Call trace:
[   20.295474]  show_stack+0x20/0x38 (C)
[   20.295562]  dump_stack_lvl+0x8c/0xd0
[   20.295614]  print_report+0x118/0x608
[   20.295793]  kasan_report+0xdc/0x128
[   20.295866]  __asan_report_load1_noabort+0x20/0x30
[   20.296230]  strcmp+0xc0/0xc8
[   20.296296]  kasan_strings+0x340/0xb00
[   20.296549]  kunit_try_run_case+0x170/0x3f0
[   20.296606]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   20.296700]  kthread+0x328/0x630
[   20.296748]  ret_from_fork+0x10/0x20
[   20.297681] 
[   20.297939] Allocated by task 261:
[   20.298180]  kasan_save_stack+0x3c/0x68
[   20.298377]  kasan_save_track+0x20/0x40
[   20.298706]  kasan_save_alloc_info+0x40/0x58
[   20.298873]  __kasan_kmalloc+0xd4/0xd8
[   20.299071]  __kmalloc_cache_noprof+0x16c/0x3c0
[   20.299768]  kasan_strings+0xc8/0xb00
[   20.299949]  kunit_try_run_case+0x170/0x3f0
[   20.300057]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   20.300348]  kthread+0x328/0x630
[   20.300388]  ret_from_fork+0x10/0x20
[   20.300960] 
[   20.301027] Freed by task 261:
[   20.301334]  kasan_save_stack+0x3c/0x68
[   20.301604]  kasan_save_track+0x20/0x40
[   20.301711]  kasan_save_free_info+0x4c/0x78
[   20.301771]  __kasan_slab_free+0x6c/0x98
[   20.302262]  kfree+0x214/0x3c8
[   20.302446]  kasan_strings+0x24c/0xb00
[   20.302621]  kunit_try_run_case+0x170/0x3f0
[   20.302779]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   20.303041]  kthread+0x328/0x630
[   20.303113]  ret_from_fork+0x10/0x20
[   20.303186] 
[   20.303593] The buggy address belongs to the object at fff00000c5be7080
[   20.303593]  which belongs to the cache kmalloc-32 of size 32
[   20.303687] The buggy address is located 16 bytes inside of
[   20.303687]  freed 32-byte region [fff00000c5be7080, fff00000c5be70a0)
[   20.304068] 
[   20.304162] The buggy address belongs to the physical page:
[   20.304211] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105be7
[   20.304296] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   20.304474] page_type: f5(slab)
[   20.304883] raw: 0bfffe0000000000 fff00000c0001780 dead000000000122 0000000000000000
[   20.304962] raw: 0000000000000000 0000000080400040 00000000f5000000 0000000000000000
[   20.305299] page dumped because: kasan: bad access detected
[   20.305382] 
[   20.305525] Memory state around the buggy address:
[   20.305592]  fff00000c5be6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[   20.305973]  fff00000c5be7000: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc
[   20.306167] >fff00000c5be7080: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   20.306214]                          ^
[   20.306529]  fff00000c5be7100: fa fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
[   20.306813]  fff00000c5be7180: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   20.306928] ==================================================================
Metadata Full log Test run details 

[   12.830590] ==================================================================
[   12.831615] BUG: KASAN: slab-use-after-free in strcmp+0xb0/0xc0
[   12.832081] Read of size 1 at addr ffff888102a07fd0 by task kunit_try_catch/278
[   12.832368] 
[   12.832488] CPU: 0 UID: 0 PID: 278 Comm: kunit_try_catch Tainted: G    B            N  6.15.4-rc3 #1 PREEMPT(voluntary) 
[   12.832538] Tainted: [B]=BAD_PAGE, [N]=TEST
[   12.832553] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   12.832576] Call Trace:
[   12.832588]  <TASK>
[   12.832608]  dump_stack_lvl+0x73/0xb0
[   12.832634]  print_report+0xd1/0x650
[   12.832659]  ? __virt_addr_valid+0x1db/0x2d0
[   12.832682]  ? strcmp+0xb0/0xc0
[   12.832699]  ? kasan_complete_mode_report_info+0x64/0x200
[   12.832722]  ? strcmp+0xb0/0xc0
[   12.832741]  kasan_report+0x141/0x180
[   12.832763]  ? strcmp+0xb0/0xc0
[   12.832785]  __asan_report_load1_noabort+0x18/0x20
[   12.832805]  strcmp+0xb0/0xc0
[   12.832824]  kasan_strings+0x431/0xe80
[   12.832844]  ? trace_hardirqs_on+0x37/0xe0
[   12.832867]  ? __pfx_kasan_strings+0x10/0x10
[   12.832888]  ? finish_task_switch.isra.0+0x153/0x700
[   12.832912]  ? __switch_to+0x5d9/0xf60
[   12.832944]  ? dequeue_task_fair+0x156/0x4e0
[   12.832968]  ? __schedule+0x10cc/0x2b60
[   12.832991]  ? __pfx_read_tsc+0x10/0x10
[   12.833011]  ? ktime_get_ts64+0x86/0x230
[   12.833035]  kunit_try_run_case+0x1a5/0x480
[   12.833061]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.833083]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   12.833107]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   12.833129]  ? __kthread_parkme+0x82/0x180
[   12.833152]  ? preempt_count_sub+0x50/0x80
[   12.833177]  ? __pfx_kunit_try_run_case+0x10/0x10
[   12.833199]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.833222]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   12.833245]  kthread+0x337/0x6f0
[   12.833261]  ? trace_preempt_on+0x20/0xc0
[   12.833283]  ? __pfx_kthread+0x10/0x10
[   12.833300]  ? _raw_spin_unlock_irq+0x47/0x80
[   12.833322]  ? calculate_sigpending+0x7b/0xa0
[   12.833343]  ? __pfx_kthread+0x10/0x10
[   12.833361]  ret_from_fork+0x41/0x80
[   12.833382]  ? __pfx_kthread+0x10/0x10
[   12.833399]  ret_from_fork_asm+0x1a/0x30
[   12.833430]  </TASK>
[   12.833441] 
[   12.841678] Allocated by task 278:
[   12.841953]  kasan_save_stack+0x45/0x70
[   12.842329]  kasan_save_track+0x18/0x40
[   12.842501]  kasan_save_alloc_info+0x3b/0x50
[   12.842647]  __kasan_kmalloc+0xb7/0xc0
[   12.842779]  __kmalloc_cache_noprof+0x189/0x420
[   12.842942]  kasan_strings+0xc0/0xe80
[   12.843074]  kunit_try_run_case+0x1a5/0x480
[   12.843461]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.843799]  kthread+0x337/0x6f0
[   12.843975]  ret_from_fork+0x41/0x80
[   12.844157]  ret_from_fork_asm+0x1a/0x30
[   12.844381] 
[   12.844468] Freed by task 278:
[   12.844593]  kasan_save_stack+0x45/0x70
[   12.844834]  kasan_save_track+0x18/0x40
[   12.845041]  kasan_save_free_info+0x3f/0x60
[   12.845308]  __kasan_slab_free+0x56/0x70
[   12.845444]  kfree+0x222/0x3f0
[   12.845593]  kasan_strings+0x2aa/0xe80
[   12.845780]  kunit_try_run_case+0x1a5/0x480
[   12.845997]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   12.846198]  kthread+0x337/0x6f0
[   12.846346]  ret_from_fork+0x41/0x80
[   12.846533]  ret_from_fork_asm+0x1a/0x30
[   12.846764] 
[   12.846834] The buggy address belongs to the object at ffff888102a07fc0
[   12.846834]  which belongs to the cache kmalloc-32 of size 32
[   12.847509] The buggy address is located 16 bytes inside of
[   12.847509]  freed 32-byte region [ffff888102a07fc0, ffff888102a07fe0)
[   12.848072] 
[   12.848145] The buggy address belongs to the physical page:
[   12.848329] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102a07
[   12.848579] flags: 0x200000000000000(node=0|zone=2)
[   12.848751] page_type: f5(slab)
[   12.848906] raw: 0200000000000000 ffff888100041780 dead000000000122 0000000000000000
[   12.849269] raw: 0000000000000000 0000000000400040 00000000f5000000 0000000000000000
[   12.849621] page dumped because: kasan: bad access detected
[   12.850183] 
[   12.850277] Memory state around the buggy address:
[   12.850721]  ffff888102a07e80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
[   12.850951]  ffff888102a07f00: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc
[   12.851412] >ffff888102a07f80: 00 00 07 fc fc fc fc fc fa fb fb fb fc fc fc fc
[   12.851778]                                                  ^
[   12.852027]  ffff888102a08000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   12.852252]  ffff888102a08080: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
[   12.852466] ==================================================================
Metadata Full log Test run details