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Date
July 5, 2025, 5:09 p.m.

Environment
qemu-arm64
qemu-x86_64 

[   18.072014] ==================================================================
[   18.072140] BUG: KASAN: use-after-free in kmalloc_large_uaf+0x2cc/0x2f8
[   18.072200] Read of size 1 at addr fff00000c65c0000 by task kunit_try_catch/148
[   18.072247] 
[   18.072278] CPU: 1 UID: 0 PID: 148 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT 
[   18.072441] Tainted: [B]=BAD_PAGE, [N]=TEST
[   18.072468] Hardware name: linux,dummy-virt (DT)
[   18.072543] Call trace:
[   18.072597]  show_stack+0x20/0x38 (C)
[   18.072650]  dump_stack_lvl+0x8c/0xd0
[   18.072700]  print_report+0x118/0x608
[   18.072744]  kasan_report+0xdc/0x128
[   18.072787]  __asan_report_load1_noabort+0x20/0x30
[   18.072835]  kmalloc_large_uaf+0x2cc/0x2f8
[   18.072890]  kunit_try_run_case+0x170/0x3f0
[   18.072936]  kunit_generic_run_threadfn_adapter+0x88/0x100
[   18.072986]  kthread+0x328/0x630
[   18.073025]  ret_from_fork+0x10/0x20
[   18.073261] 
[   18.073289] The buggy address belongs to the physical page:
[   18.073327] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1065c0
[   18.073459] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff)
[   18.073545] raw: 0bfffe0000000000 fff00000da479c40 fff00000da479c40 0000000000000000
[   18.073593] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[   18.073631] page dumped because: kasan: bad access detected
[   18.073709] 
[   18.073728] Memory state around the buggy address:
[   18.073777]  fff00000c65bff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.073818]  fff00000c65bff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   18.073867] >fff00000c65c0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.074055]                    ^
[   18.074180]  fff00000c65c0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.074292]  fff00000c65c0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   18.074342] ==================================================================
Metadata Full log Test run details 

[   11.103567] ==================================================================
[   11.104148] BUG: KASAN: use-after-free in kmalloc_large_uaf+0x2f1/0x340
[   11.104599] Read of size 1 at addr ffff88810390c000 by task kunit_try_catch/166
[   11.105072] 
[   11.105197] CPU: 1 UID: 0 PID: 166 Comm: kunit_try_catch Tainted: G    B            N  6.16.0-rc4 #1 PREEMPT(voluntary) 
[   11.105240] Tainted: [B]=BAD_PAGE, [N]=TEST
[   11.105252] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   11.105272] Call Trace:
[   11.105284]  <TASK>
[   11.105299]  dump_stack_lvl+0x73/0xb0
[   11.105327]  print_report+0xd1/0x650
[   11.105348]  ? __virt_addr_valid+0x1db/0x2d0
[   11.105370]  ? kmalloc_large_uaf+0x2f1/0x340
[   11.105396]  ? kasan_addr_to_slab+0x11/0xa0
[   11.105416]  ? kmalloc_large_uaf+0x2f1/0x340
[   11.105436]  kasan_report+0x141/0x180
[   11.105469]  ? kmalloc_large_uaf+0x2f1/0x340
[   11.105495]  __asan_report_load1_noabort+0x18/0x20
[   11.105518]  kmalloc_large_uaf+0x2f1/0x340
[   11.105538]  ? __pfx_kmalloc_large_uaf+0x10/0x10
[   11.105561]  ? __pfx_kmalloc_large_uaf+0x10/0x10
[   11.105585]  kunit_try_run_case+0x1a5/0x480
[   11.105609]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.105629]  ? _raw_spin_lock_irqsave+0xa1/0x100
[   11.105652]  ? _raw_spin_unlock_irqrestore+0x5f/0x90
[   11.105674]  ? __kthread_parkme+0x82/0x180
[   11.105693]  ? preempt_count_sub+0x50/0x80
[   11.105715]  ? __pfx_kunit_try_run_case+0x10/0x10
[   11.105738]  kunit_generic_run_threadfn_adapter+0x85/0xf0
[   11.105759]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10
[   11.105781]  kthread+0x337/0x6f0
[   11.105799]  ? trace_preempt_on+0x20/0xc0
[   11.105821]  ? __pfx_kthread+0x10/0x10
[   11.105841]  ? _raw_spin_unlock_irq+0x47/0x80
[   11.105861]  ? calculate_sigpending+0x7b/0xa0
[   11.105883]  ? __pfx_kthread+0x10/0x10
[   11.105904]  ret_from_fork+0x116/0x1d0
[   11.105921]  ? __pfx_kthread+0x10/0x10
[   11.105941]  ret_from_fork_asm+0x1a/0x30
[   11.105971]  </TASK>
[   11.105981] 
[   11.116695] The buggy address belongs to the physical page:
[   11.116939] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10390c
[   11.117635] flags: 0x200000000000000(node=0|zone=2)
[   11.118064] raw: 0200000000000000 ffffea00040e5208 ffff88815b139f80 0000000000000000
[   11.118770] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[   11.119094] page dumped because: kasan: bad access detected
[   11.119648] 
[   11.119896] Memory state around the buggy address:
[   11.120121]  ffff88810390bf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.120816]  ffff88810390bf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.121138] >ffff88810390c000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.121959]                    ^
[   11.122161]  ffff88810390c080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.122609]  ffff88810390c100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   11.122909] ==================================================================
Metadata Full log Test run details