[   25.460373] ==================================================================
[   25.461166] BUG: KASAN: slab-use-after-free in kmalloc_double_kzfree+0x19c/0x350
[   25.461517] Read of size 1 at addr ffff888104919c60 by task kunit_try_catch/240
[   25.461979] 
[   25.462109] CPU: 0 UID: 0 PID: 240 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc7-next-20250722 #1 PREEMPT(voluntary) 
[   25.462172] Tainted: [B]=BAD_PAGE, [N]=TEST
[   25.462184] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   25.462206] Call Trace:
[   25.462219]  <TASK>
[   25.462233]  dump_stack_lvl+0x73/0xb0
[   25.462275]  print_report+0xd1/0x640
[   25.462300]  ? __virt_addr_valid+0x1db/0x2d0
[   25.462323]  ? kmalloc_double_kzfree+0x19c/0x350
[   25.462346]  ? kasan_complete_mode_report_info+0x64/0x200
[   25.462372]  ? kmalloc_double_kzfree+0x19c/0x350
[   25.462418]  kasan_report+0x141/0x180
[   25.462441]  ? kmalloc_double_kzfree+0x19c/0x350
[   25.462467]  ? kmalloc_double_kzfree+0x19c/0x350
[   25.462490]  __kasan_check_byte+0x3d/0x50
[   25.462512]  kfree_sensitive+0x22/0x90
[   25.462551]  kmalloc_double_kzfree+0x19c/0x350
[   25.462575]  ? __pfx_kmalloc_double_kzfree+0x10/0x10
[   25.462599]  ? __schedule+0x10da/0x2b60
[   25.462625]  ? __pfx_read_tsc+0x10/0x10
[   25.462647]  ? ktime_get_ts64+0x86/0x230
[   25.462671]  kunit_try_run_case+0x1a5/0x480
[   25.462696]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.462718]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   25.462743]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   25.462769]  ? __kthread_parkme+0x82/0x180
[   25.462789]  ? preempt_count_sub+0x50/0x80
[   25.462812]  ? __pfx_kunit_try_run_case+0x10/0x10
[   25.462846]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.462871]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   25.462894]  kthread+0x337/0x6f0
[   25.462914]  ? trace_preempt_on+0x20/0xc0
[   25.462937]  ? __pfx_kthread+0x10/0x10
[   25.462958]  ? _raw_spin_unlock_irq+0x47/0x80
[   25.462981]  ? calculate_sigpending+0x7b/0xa0
[   25.463005]  ? __pfx_kthread+0x10/0x10
[   25.463026]  ret_from_fork+0x116/0x1d0
[   25.463046]  ? __pfx_kthread+0x10/0x10
[   25.463066]  ret_from_fork_asm+0x1a/0x30
[   25.463097]  </TASK>
[   25.463109] 
[   25.472013] Allocated by task 240:
[   25.472149]  kasan_save_stack+0x45/0x70
[   25.472354]  kasan_save_track+0x18/0x40
[   25.472725]  kasan_save_alloc_info+0x3b/0x50
[   25.472939]  __kasan_kmalloc+0xb7/0xc0
[   25.473075]  __kmalloc_cache_noprof+0x189/0x420
[   25.473273]  kmalloc_double_kzfree+0xa9/0x350
[   25.473484]  kunit_try_run_case+0x1a5/0x480
[   25.473897]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.474116]  kthread+0x337/0x6f0
[   25.474240]  ret_from_fork+0x116/0x1d0
[   25.474375]  ret_from_fork_asm+0x1a/0x30
[   25.474687] 
[   25.474825] Freed by task 240:
[   25.475025]  kasan_save_stack+0x45/0x70
[   25.475280]  kasan_save_track+0x18/0x40
[   25.475561]  kasan_save_free_info+0x3f/0x60
[   25.475797]  __kasan_slab_free+0x56/0x70
[   25.475949]  kfree+0x222/0x3f0
[   25.476074]  kfree_sensitive+0x67/0x90
[   25.476390]  kmalloc_double_kzfree+0x12b/0x350
[   25.476984]  kunit_try_run_case+0x1a5/0x480
[   25.477273]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   25.477645]  kthread+0x337/0x6f0
[   25.477775]  ret_from_fork+0x116/0x1d0
[   25.477924]  ret_from_fork_asm+0x1a/0x30
[   25.478065] 
[   25.478154] The buggy address belongs to the object at ffff888104919c60
[   25.478154]  which belongs to the cache kmalloc-16 of size 16
[   25.479102] The buggy address is located 0 bytes inside of
[   25.479102]  freed 16-byte region [ffff888104919c60, ffff888104919c70)
[   25.479677] 
[   25.479752] The buggy address belongs to the physical page:
[   25.480160] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104919
[   25.480670] flags: 0x200000000000000(node=0|zone=2)
[   25.480936] page_type: f5(slab)
[   25.481102] raw: 0200000000000000 ffff888100041640 dead000000000122 0000000000000000
[   25.481659] raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000
[   25.481970] page dumped because: kasan: bad access detected
[   25.482157] 
[   25.482259] Memory state around the buggy address:
[   25.482546]  ffff888104919b00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   25.482883]  ffff888104919b80: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   25.483136] >ffff888104919c00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
[   25.483369]                                                        ^
[   25.483772]  ffff888104919c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.484017]  ffff888104919d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   25.484505] ==================================================================