BUG: kernel NULL pointer dereference, address: 0000000000000008
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: Oops: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5191 Comm: udevd Tainted: G I L syzkaller #0 PREEMPT(full)
Tainted: [I]=FIRMWARE_WORKAROUND, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline]
RIP: 0010:qlist_free_all+0x8d/0xf0 mm/kasan/quarantine.c:176
Code: 48 89 c2 48 c1 e2 06 48 03 15 37 a4 aa 0b 48 8b 42 08 48 89 c1 83 e1 01 48 83 e9 01 48 09 c8 48 21 d0 80 78 33 f5 49 0f 45 c5 <48> 8b 68 08 eb 88 48 83 7d 40 00 75 9b 66 f7 45 08 04 02 75 93 8b
RSP: 0018:ffffc90003607d00 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888085580001 RCX: ffffffffffffffff
RDX: ffffea0002156000 RSI: 0000000000040002 RDI: ffff888085580001
RBP: 0000000000000000 R08: ffff888029c38000 R09: 0000000800040002
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888085580001
R13: 0000000000000000 R14: ffffc90003607d30 R15: 00000000000000c0
FS: 00007f094a3a3880(0000) GS:ffff888124310000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 000000007ca10000 CR4: 00000000003526f0
Call Trace:
<TASK>
kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4569 [inline]
slab_alloc_node mm/slub.c:4898 [inline]
kmem_cache_alloc_noprof+0x241/0x6e0 mm/slub.c:4905
alloc_filename fs/namei.c:142 [inline]
do_getname+0x35/0x390 fs/namei.c:182
class_filename_flags_constructor include/linux/fs.h:2562 [inline]
do_readlinkat+0xa9/0x370 fs/stat.c:569
__do_sys_readlink fs/stat.c:605 [inline]
__se_sys_readlink fs/stat.c:602 [inline]
__x64_sys_readlink+0x78/0xc0 fs/stat.c:602
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0949d153a7
Code: 00 00 90 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 00 31 c9 e8 8a 20 f9 ff 48 83 c4 18 c3 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 21 ba 0d 00 f7 d8 64 89 02 48
RSP: 002b:00007ffdf6215c58 EFLAGS: 00000202 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007ffdf6215e60 RCX: 00007f0949d153a7
RDX: 0000000000000200 RSI: 00007ffdf6215c60 RDI: 00007ffdf6215e60
RBP: 000055dd6932c910 R08: 0000000000000064 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffdf6215c60
R13: 000055dd4b04f100 R14: 0000000000000001 R15: 00007ffdf6216480
</TASK>
Modules linked in:
CR2: 0000000000000008
---[ end trace 0000000000000000 ]---
RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline]
RIP: 0010:qlist_free_all+0x8d/0xf0 mm/kasan/quarantine.c:176
Code: 48 89 c2 48 c1 e2 06 48 03 15 37 a4 aa 0b 48 8b 42 08 48 89 c1 83 e1 01 48 83 e9 01 48 09 c8 48 21 d0 80 78 33 f5 49 0f 45 c5 <48> 8b 68 08 eb 88 48 83 7d 40 00 75 9b 66 f7 45 08 04 02 75 93 8b
RSP: 0018:ffffc90003607d00 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888085580001 RCX: ffffffffffffffff
RDX: ffffea0002156000 RSI: 0000000000040002 RDI: ffff888085580001
RBP: 0000000000000000 R08: ffff888029c38000 R09: 0000000800040002
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888085580001
R13: 0000000000000000 R14: ffffc90003607d30 R15: 00000000000000c0
FS: 00007f094a3a3880(0000) GS:ffff888124310000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 000000007ca10000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 48 89 c2 mov %rax,%rdx
3: 48 c1 e2 06 shl $0x6,%rdx
7: 48 03 15 37 a4 aa 0b add 0xbaaa437(%rip),%rdx # 0xbaaa445
e: 48 8b 42 08 mov 0x8(%rdx),%rax
12: 48 89 c1 mov %rax,%rcx
15: 83 e1 01 and $0x1,%ecx
18: 48 83 e9 01 sub $0x1,%rcx
1c: 48 09 c8 or %rcx,%rax
1f: 48 21 d0 and %rdx,%rax
22: 80 78 33 f5 cmpb $0xf5,0x33(%rax)
26: 49 0f 45 c5 cmovne %r13,%rax
* 2a: 48 8b 68 08 mov 0x8(%rax),%rbp <-- trapping instruction
2e: eb 88 jmp 0xffffffb8
30: 48 83 7d 40 00 cmpq $0x0,0x40(%rbp)
35: 75 9b jne 0xffffffd2
37: 66 f7 45 08 04 02 testw $0x204,0x8(%rbp)
3d: 75 93 jne 0xffffffd2
3f: 8b .byte 0x8b