Hay
Date
June 16, 2025, 7:07 a.m.

Environment
qemu-arm64
qemu-x86_64

[   19.577949] ==================================================================
[   19.578481] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x168/0x308
[   19.579163] Read of size 1 at addr fff00000c63971c0 by task kunit_try_catch/201
[   19.579551] 
[   19.579910] CPU: 0 UID: 0 PID: 201 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc2-next-20250616 #1 PREEMPT 
[   19.580135] Tainted: [B]=BAD_PAGE, [N]=TEST
[   19.580197] Hardware name: linux,dummy-virt (DT)
[   19.580270] Call trace:
[   19.580323]  show_stack+0x20/0x38 (C)
[   19.580443]  dump_stack_lvl+0x8c/0xd0
[   19.580547]  print_report+0x118/0x608
[   19.580653]  kasan_report+0xdc/0x128
[   19.580752]  __kasan_check_byte+0x54/0x70
[   19.582446]  kfree_sensitive+0x30/0xb0
[   19.582710]  kmalloc_double_kzfree+0x168/0x308
[   19.583102]  kunit_try_run_case+0x170/0x3f0
[   19.583341]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   19.584201]  kthread+0x328/0x630
[   19.584476]  ret_from_fork+0x10/0x20
[   19.584623] 
[   19.584730] Allocated by task 201:
[   19.584893]  kasan_save_stack+0x3c/0x68
[   19.585069]  kasan_save_track+0x20/0x40
[   19.585212]  kasan_save_alloc_info+0x40/0x58
[   19.585307]  __kasan_kmalloc+0xd4/0xd8
[   19.585577]  __kmalloc_cache_noprof+0x16c/0x3c0
[   19.585688]  kmalloc_double_kzfree+0xb8/0x308
[   19.586253]  kunit_try_run_case+0x170/0x3f0
[   19.586399]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   19.586749]  kthread+0x328/0x630
[   19.587141]  ret_from_fork+0x10/0x20
[   19.587278] 
[   19.587326] Freed by task 201:
[   19.587651]  kasan_save_stack+0x3c/0x68
[   19.587779]  kasan_save_track+0x20/0x40
[   19.587878]  kasan_save_free_info+0x4c/0x78
[   19.587972]  __kasan_slab_free+0x6c/0x98
[   19.588059]  kfree+0x214/0x3c8
[   19.588139]  kfree_sensitive+0x80/0xb0
[   19.588223]  kmalloc_double_kzfree+0x11c/0x308
[   19.588317]  kunit_try_run_case+0x170/0x3f0
[   19.588407]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   19.588515]  kthread+0x328/0x630
[   19.588594]  ret_from_fork+0x10/0x20
[   19.588675] 
[   19.588723] The buggy address belongs to the object at fff00000c63971c0
[   19.588723]  which belongs to the cache kmalloc-16 of size 16
[   19.589567] The buggy address is located 0 bytes inside of
[   19.589567]  freed 16-byte region [fff00000c63971c0, fff00000c63971d0)
[   19.589931] 
[   19.590008] The buggy address belongs to the physical page:
[   19.590166] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106397
[   19.590533] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   19.590814] page_type: f5(slab)
[   19.591907] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000
[   19.592124] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000
[   19.592517] page dumped because: kasan: bad access detected
[   19.592868] 
[   19.592932] Memory state around the buggy address:
[   19.593016]  fff00000c6397080: fa fb fc fc fa fb fc fc fa fb fc fc 00 04 fc fc
[   19.593110]  fff00000c6397100: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   19.593213] >fff00000c6397180: fa fb fc fc fa fb fc fc fa fb fc fc fc fc fc fc
[   19.593779]                                            ^
[   19.593989]  fff00000c6397200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   19.594583]  fff00000c6397280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   19.594859] ==================================================================

[   11.793971] ==================================================================
[   11.794413] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350
[   11.794640] Read of size 1 at addr ffff888102225de0 by task kunit_try_catch/217
[   11.794844] 
[   11.794926] CPU: 0 UID: 0 PID: 217 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc2-next-20250616 #1 PREEMPT(voluntary) 
[   11.794987] Tainted: [B]=BAD_PAGE, [N]=TEST
[   11.794998] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   11.795018] Call Trace:
[   11.795029]  <TASK>
[   11.795047]  dump_stack_lvl+0x73/0xb0
[   11.795075]  print_report+0xd1/0x650
[   11.795096]  ? __virt_addr_valid+0x1db/0x2d0
[   11.795118]  ? kmalloc_double_kzfree+0x19c/0x350
[   11.795139]  ? kasan_complete_mode_report_info+0x64/0x200
[   11.795160]  ? kmalloc_double_kzfree+0x19c/0x350
[   11.795182]  kasan_report+0x141/0x180
[   11.795202]  ? kmalloc_double_kzfree+0x19c/0x350
[   11.795226]  ? kmalloc_double_kzfree+0x19c/0x350
[   11.795247]  __kasan_check_byte+0x3d/0x50
[   11.795267]  kfree_sensitive+0x22/0x90
[   11.795289]  kmalloc_double_kzfree+0x19c/0x350
[   11.795309]  ? __pfx_kmalloc_double_kzfree+0x10/0x10
[   11.795332]  ? __schedule+0x10cc/0x2b60
[   11.795352]  ? __pfx_read_tsc+0x10/0x10
[   11.795372]  ? ktime_get_ts64+0x86/0x230
[   11.795396]  kunit_try_run_case+0x1a5/0x480
[   11.795419]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.795439]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   11.795460]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   11.795481]  ? __kthread_parkme+0x82/0x180
[   11.795502]  ? preempt_count_sub+0x50/0x80
[   11.795524]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.795547]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.795568]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   11.795589]  kthread+0x337/0x6f0
[   11.795608]  ? trace_preempt_on+0x20/0xc0
[   11.795631]  ? __pfx_kthread+0x10/0x10
[   11.795651]  ? _raw_spin_unlock_irq+0x47/0x80
[   11.795670]  ? calculate_sigpending+0x7b/0xa0
[   11.795693]  ? __pfx_kthread+0x10/0x10
[   11.795713]  ret_from_fork+0x116/0x1d0
[   11.795731]  ? __pfx_kthread+0x10/0x10
[   11.795751]  ret_from_fork_asm+0x1a/0x30
[   11.795780]  </TASK>
[   11.795790] 
[   11.816159] Allocated by task 217:
[   11.816303]  kasan_save_stack+0x45/0x70
[   11.816458]  kasan_save_track+0x18/0x40
[   11.816587]  kasan_save_alloc_info+0x3b/0x50
[   11.816727]  __kasan_kmalloc+0xb7/0xc0
[   11.816850]  __kmalloc_cache_noprof+0x189/0x420
[   11.817043]  kmalloc_double_kzfree+0xa9/0x350
[   11.817252]  kunit_try_run_case+0x1a5/0x480
[   11.817534]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.817981]  kthread+0x337/0x6f0
[   11.818160]  ret_from_fork+0x116/0x1d0
[   11.818336]  ret_from_fork_asm+0x1a/0x30
[   11.818682] 
[   11.818781] Freed by task 217:
[   11.818941]  kasan_save_stack+0x45/0x70
[   11.819176]  kasan_save_track+0x18/0x40
[   11.819531]  kasan_save_free_info+0x3f/0x60
[   11.819709]  __kasan_slab_free+0x56/0x70
[   11.819862]  kfree+0x222/0x3f0
[   11.820209]  kfree_sensitive+0x67/0x90
[   11.820515]  kmalloc_double_kzfree+0x12b/0x350
[   11.820867]  kunit_try_run_case+0x1a5/0x480
[   11.821021]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.821228]  kthread+0x337/0x6f0
[   11.821815]  ret_from_fork+0x116/0x1d0
[   11.822028]  ret_from_fork_asm+0x1a/0x30
[   11.822302] 
[   11.822395] The buggy address belongs to the object at ffff888102225de0
[   11.822395]  which belongs to the cache kmalloc-16 of size 16
[   11.822999] The buggy address is located 0 bytes inside of
[   11.822999]  freed 16-byte region [ffff888102225de0, ffff888102225df0)
[   11.823671] 
[   11.823783] The buggy address belongs to the physical page:
[   11.824089] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102225
[   11.824534] flags: 0x200000000000000(node=0|zone=2)
[   11.824836] page_type: f5(slab)
[   11.824976] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000
[   11.825311] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000
[   11.825756] page dumped because: kasan: bad access detected
[   11.826020] 
[   11.826158] Memory state around the buggy address:
[   11.826696]  ffff888102225c80: 00 02 fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   11.826997]  ffff888102225d00: 00 05 fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   11.827331] >ffff888102225d80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   11.827692]                                                        ^
[   11.827990]  ffff888102225e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   11.828366]  ffff888102225e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   11.828788] ==================================================================