BUG: kernel NULL pointer dereference, address: 0000000000000008
#PF: supervisor read access in kernel mode
#PF: error_code(0x0001) - permissions violation
PGD 8000000039dfb067 P4D 8000000039dfb067 PUD 28952067 PMD 28951067 PTE 405b4067
Oops: Oops: 0001 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 8442 Comm: syz.0.530 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline]
RIP: 0010:qlist_move_cache+0x95/0xe0 mm/kasan/quarantine.c:303
Code: a1 05 47 ff 48 c1 e8 0c 48 c1 e0 06 48 03 05 02 66 af 0b 48 8b 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 80 78 33 f5 49 0f 45 c4 <48> 8b 40 08 8b 50 30 48 39 c5 75 9a 48 83 3b 00 74 33 48 8b 43 08
RSP: 0018:ffffc90004817c88 EFLAGS: 00010006
RAX: 0000000000000000 RBX: ffffc90004817cc0 RCX: ffffffffffffffff
RDX: 0000000000000000 RSI: ffffffff816e55d8 RDI: 0000000000000007
RBP: ffff88805b4d3500 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88802f4f66b0 R12: 0000000000000000
R13: ffff888029b20001 R14: ffffffff9ac41be0 R15: 0000000000000000
FS: 0000555566738500(0000) GS:ffff8881249fc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 00000000223c2000 CR4: 00000000003526f0
Call Trace:
<TASK>
kasan_quarantine_remove_cache+0x10a/0x180 mm/kasan/quarantine.c:370
kmem_cache_destroy mm/slab_common.c:527 [inline]
kmem_cache_destroy+0x6f/0x180 mm/slab_common.c:487
mon_text_release+0x267/0x3d0 drivers/usb/mon/mon_text.c:677
full_proxy_release+0xc0/0x140 fs/debugfs/file.c:427
__fput+0x402/0xb70 fs/file_table.c:468
task_work_run+0x150/0x240 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
exit_to_user_mode_loop+0xfb/0x540 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f63cb18f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd76767b08 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f63cb3e7da0 RCX: 00007f63cb18f7c9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f63cb3e7da0 R08: 0000000000000000 R09: 0000001e76767dff
R10: 000000000003fcac R11: 0000000000000246 R12: 0000000000042527
R13: 00007f63cb3e6540 R14: ffffffffffffffff R15: 00007ffd76767c20
</TASK>
Modules linked in:
CR2: 0000000000000008
---[ end trace 0000000000000000 ]---
RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline]
RIP: 0010:qlist_move_cache+0x95/0xe0 mm/kasan/quarantine.c:303
Code: a1 05 47 ff 48 c1 e8 0c 48 c1 e0 06 48 03 05 02 66 af 0b 48 8b 50 08 48 8d 4a ff 83 e2 01 48 0f 45 c1 80 78 33 f5 49 0f 45 c4 <48> 8b 40 08 8b 50 30 48 39 c5 75 9a 48 83 3b 00 74 33 48 8b 43 08
RSP: 0018:ffffc90004817c88 EFLAGS: 00010006
RAX: 0000000000000000 RBX: ffffc90004817cc0 RCX: ffffffffffffffff
RDX: 0000000000000000 RSI: ffffffff816e55d8 RDI: 0000000000000007
RBP: ffff88805b4d3500 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88802f4f66b0 R12: 0000000000000000
R13: ffff888029b20001 R14: ffffffff9ac41be0 R15: 0000000000000000
FS: 0000555566738500(0000) GS:ffff8881249fc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 00000000223c2000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: a1 05 47 ff 48 c1 e8 movabs 0x480ce8c148ff4705,%eax
7: 0c 48
9: c1 e0 06 shl $0x6,%eax
c: 48 03 05 02 66 af 0b add 0xbaf6602(%rip),%rax # 0xbaf6615
13: 48 8b 50 08 mov 0x8(%rax),%rdx
17: 48 8d 4a ff lea -0x1(%rdx),%rcx
1b: 83 e2 01 and $0x1,%edx
1e: 48 0f 45 c1 cmovne %rcx,%rax
22: 80 78 33 f5 cmpb $0xf5,0x33(%rax)
26: 49 0f 45 c4 cmovne %r12,%rax
* 2a: 48 8b 40 08 mov 0x8(%rax),%rax <-- trapping instruction
2e: 8b 50 30 mov 0x30(%rax),%edx
31: 48 39 c5 cmp %rax,%rbp
34: 75 9a jne 0xffffffd0
36: 48 83 3b 00 cmpq $0x0,(%rbx)
3a: 74 33 je 0x6f
3c: 48 8b 43 08 mov 0x8(%rbx),%rax