Hay
Date
July 3, 2025, 6:13 p.m.

Environment
qemu-arm64
qemu-x86_64

[   16.998877] ==================================================================
[   16.999147] BUG: KASAN: double-free in kfree_sensitive+0x3c/0xb0
[   16.999206] Free of addr fff00000c3fbdda0 by task kunit_try_catch/192
[   16.999249] 
[   16.999301] CPU: 0 UID: 0 PID: 192 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT 
[   16.999384] Tainted: [B]=BAD_PAGE, [N]=TEST
[   16.999415] Hardware name: linux,dummy-virt (DT)
[   16.999445] Call trace:
[   16.999465]  show_stack+0x20/0x38 (C)
[   16.999511]  dump_stack_lvl+0x8c/0xd0
[   16.999556]  print_report+0x118/0x608
[   16.999602]  kasan_report_invalid_free+0xc0/0xe8
[   16.999658]  check_slab_allocation+0xd4/0x108
[   16.999706]  __kasan_slab_pre_free+0x2c/0x48
[   16.999753]  kfree+0xe8/0x3c8
[   16.999802]  kfree_sensitive+0x3c/0xb0
[   16.999849]  kmalloc_double_kzfree+0x168/0x308
[   16.999894]  kunit_try_run_case+0x170/0x3f0
[   16.999941]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   16.999992]  kthread+0x328/0x630
[   17.000045]  ret_from_fork+0x10/0x20
[   17.000101] 
[   17.000120] Allocated by task 192:
[   17.000147]  kasan_save_stack+0x3c/0x68
[   17.000185]  kasan_save_track+0x20/0x40
[   17.000235]  kasan_save_alloc_info+0x40/0x58
[   17.000278]  __kasan_kmalloc+0xd4/0xd8
[   17.000315]  __kmalloc_cache_noprof+0x16c/0x3c0
[   17.000363]  kmalloc_double_kzfree+0xb8/0x308
[   17.000407]  kunit_try_run_case+0x170/0x3f0
[   17.000457]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   17.000506]  kthread+0x328/0x630
[   17.000697]  ret_from_fork+0x10/0x20
[   17.000867] 
[   17.001140] Freed by task 192:
[   17.001490]  kasan_save_stack+0x3c/0x68
[   17.001560]  kasan_save_track+0x20/0x40
[   17.001620]  kasan_save_free_info+0x4c/0x78
[   17.001830]  __kasan_slab_free+0x6c/0x98
[   17.002280]  kfree+0x214/0x3c8
[   17.002356]  kfree_sensitive+0x80/0xb0
[   17.002493]  kmalloc_double_kzfree+0x11c/0x308
[   17.002881]  kunit_try_run_case+0x170/0x3f0
[   17.002971]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   17.003225]  kthread+0x328/0x630
[   17.003436]  ret_from_fork+0x10/0x20
[   17.003519] 
[   17.003539] The buggy address belongs to the object at fff00000c3fbdda0
[   17.003539]  which belongs to the cache kmalloc-16 of size 16
[   17.003850] The buggy address is located 0 bytes inside of
[   17.003850]  16-byte region [fff00000c3fbdda0, fff00000c3fbddb0)
[   17.003930] 
[   17.004043] The buggy address belongs to the physical page:
[   17.004096] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103fbd
[   17.004332] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   17.004544] page_type: f5(slab)
[   17.004948] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000
[   17.005153] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000
[   17.005286] page dumped because: kasan: bad access detected
[   17.005326] 
[   17.005343] Memory state around the buggy address:
[   17.005681]  fff00000c3fbdc80: fa fb fc fc fa fb fc fc fa fb fc fc 00 04 fc fc
[   17.005734]  fff00000c3fbdd00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   17.005977] >fff00000c3fbdd80: fa fb fc fc fa fb fc fc fc fc fc fc fc fc fc fc
[   17.006188]                                ^
[   17.006399]  fff00000c3fbde00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   17.006445]  fff00000c3fbde80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   17.006652] ==================================================================

[   11.829023] ==================================================================
[   11.829844] BUG: KASAN: double-free in kfree_sensitive+0x2e/0x90
[   11.830425] Free of addr ffff888101745ec0 by task kunit_try_catch/210
[   11.830741] 
[   11.830836] CPU: 1 UID: 0 PID: 210 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   11.830877] Tainted: [B]=BAD_PAGE, [N]=TEST
[   11.830889] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   11.830909] Call Trace:
[   11.830923]  <TASK>
[   11.830939]  dump_stack_lvl+0x73/0xb0
[   11.832581]  print_report+0xd1/0x650
[   11.832623]  ? __virt_addr_valid+0x1db/0x2d0
[   11.832648]  ? kasan_complete_mode_report_info+0x64/0x200
[   11.832670]  ? kfree_sensitive+0x2e/0x90
[   11.832692]  kasan_report_invalid_free+0x10a/0x130
[   11.832717]  ? kfree_sensitive+0x2e/0x90
[   11.832738]  ? kfree_sensitive+0x2e/0x90
[   11.832756]  check_slab_allocation+0x101/0x130
[   11.832777]  __kasan_slab_pre_free+0x28/0x40
[   11.832798]  kfree+0xf0/0x3f0
[   11.832820]  ? kfree_sensitive+0x2e/0x90
[   11.832841]  kfree_sensitive+0x2e/0x90
[   11.832860]  kmalloc_double_kzfree+0x19c/0x350
[   11.832883]  ? __pfx_kmalloc_double_kzfree+0x10/0x10
[   11.832906]  ? __schedule+0x10cc/0x2b60
[   11.832927]  ? __pfx_read_tsc+0x10/0x10
[   11.832948]  ? ktime_get_ts64+0x86/0x230
[   11.832971]  kunit_try_run_case+0x1a5/0x480
[   11.832995]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.833016]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   11.833039]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   11.833061]  ? __kthread_parkme+0x82/0x180
[   11.833079]  ? preempt_count_sub+0x50/0x80
[   11.833126]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.833149]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.833341]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   11.833364]  kthread+0x337/0x6f0
[   11.833383]  ? trace_preempt_on+0x20/0xc0
[   11.833406]  ? __pfx_kthread+0x10/0x10
[   11.833427]  ? _raw_spin_unlock_irq+0x47/0x80
[   11.833447]  ? calculate_sigpending+0x7b/0xa0
[   11.833470]  ? __pfx_kthread+0x10/0x10
[   11.833490]  ret_from_fork+0x116/0x1d0
[   11.833508]  ? __pfx_kthread+0x10/0x10
[   11.833527]  ret_from_fork_asm+0x1a/0x30
[   11.833557]  </TASK>
[   11.833569] 
[   11.841055] Allocated by task 210:
[   11.841411]  kasan_save_stack+0x45/0x70
[   11.841620]  kasan_save_track+0x18/0x40
[   11.841817]  kasan_save_alloc_info+0x3b/0x50
[   11.842017]  __kasan_kmalloc+0xb7/0xc0
[   11.842348]  __kmalloc_cache_noprof+0x189/0x420
[   11.842591]  kmalloc_double_kzfree+0xa9/0x350
[   11.842786]  kunit_try_run_case+0x1a5/0x480
[   11.842932]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.843122]  kthread+0x337/0x6f0
[   11.843301]  ret_from_fork+0x116/0x1d0
[   11.843491]  ret_from_fork_asm+0x1a/0x30
[   11.843863] 
[   11.844016] Freed by task 210:
[   11.844183]  kasan_save_stack+0x45/0x70
[   11.844451]  kasan_save_track+0x18/0x40
[   11.844622]  kasan_save_free_info+0x3f/0x60
[   11.844809]  __kasan_slab_free+0x56/0x70
[   11.845000]  kfree+0x222/0x3f0
[   11.845149]  kfree_sensitive+0x67/0x90
[   11.845282]  kmalloc_double_kzfree+0x12b/0x350
[   11.845434]  kunit_try_run_case+0x1a5/0x480
[   11.845579]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.845792]  kthread+0x337/0x6f0
[   11.845957]  ret_from_fork+0x116/0x1d0
[   11.846143]  ret_from_fork_asm+0x1a/0x30
[   11.846342] 
[   11.846586] The buggy address belongs to the object at ffff888101745ec0
[   11.846586]  which belongs to the cache kmalloc-16 of size 16
[   11.847066] The buggy address is located 0 bytes inside of
[   11.847066]  16-byte region [ffff888101745ec0, ffff888101745ed0)
[   11.847840] 
[   11.847925] The buggy address belongs to the physical page:
[   11.848235] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101745
[   11.848553] flags: 0x200000000000000(node=0|zone=2)
[   11.848721] page_type: f5(slab)
[   11.848842] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000
[   11.849142] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000
[   11.849705] page dumped because: kasan: bad access detected
[   11.849969] 
[   11.850061] Memory state around the buggy address:
[   11.850576]  ffff888101745d80: 00 01 fc fc 00 04 fc fc 00 04 fc fc 00 05 fc fc
[   11.850903]  ffff888101745e00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   11.851152] >ffff888101745e80: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc
[   11.851488]                                            ^
[   11.851766]  ffff888101745f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   11.851984]  ffff888101745f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   11.852571] ==================================================================