BUG: kernel NULL pointer dereference, address: 0000000000000080
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 19216 Comm: systemd-udevd Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:137 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:142 [inline]
RIP: 0010:qlist_free_all+0x36/0x160 mm/kasan/quarantine.c:168
Code: 53 48 83 ec 08 48 8b 37 48 85 f6 0f 84 24 01 00 00 48 85 ed 49 89 fd 49 89 ef 49 be 00 00 00 00 00 fc ff df 0f 84 98 00 00 00 <49> 63 87 80 00 00 00 4c 8b 26 48 29 c6 48 83 3d 35 f8 01 08 00 0f
RSP: 0018:ffffc900151afbb0 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: 0000000000000286 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffff888000000000 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000000000
R13: ffffc900151afbf0 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f053e67f8c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 000000021afce000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 quarantine_reduce+0x17e/0x200 mm/kasan/quarantine.c:261
 __kasan_kmalloc.constprop.0+0x9e/0xd0 mm/kasan/common.c:442
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc mm/slab.c:3312 [inline]
 kmem_cache_alloc+0x138/0x3a0 mm/slab.c:3482
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
 getname_flags fs/namei.c:2646 [inline]
 user_path_at_empty+0xa1/0x100 fs/namei.c:2646
 user_path_at include/linux/namei.h:59 [inline]
 vfs_statx+0x14e/0x390 fs/stat.c:202
 vfs_lstat include/linux/fs.h:3165 [inline]
 __do_sys_newlstat+0x91/0x110 fs/stat.c:374
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f053d4f2335
Code: 69 db 2b 00 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 06 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 8b 15 31 db 2b 00 f7 d8 64 89
RSP: 002b:00007ffd310a98b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 00005636b99d9660 RCX: 00007f053d4f2335
RDX: 00007ffd310a98f0 RSI: 00007ffd310a98f0 RDI: 00005636b99d8660
RBP: 00007ffd310a99b0 R08: 00007f053d7b11b8 R09: 0000000000001010
R10: 0000000000000020 R11: 0000000000000246 R12: 00005636b99d8660
R13: 00005636b99d8674 R14: 00005636b99d52ed R15: 00005636b99d52f4
Modules linked in:
CR2: 0000000000000080
---[ end trace 235b079ec1368247 ]---
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:137 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:142 [inline]
RIP: 0010:qlist_free_all+0x36/0x160 mm/kasan/quarantine.c:168
Code: 53 48 83 ec 08 48 8b 37 48 85 f6 0f 84 24 01 00 00 48 85 ed 49 89 fd 49 89 ef 49 be 00 00 00 00 00 fc ff df 0f 84 98 00 00 00 <49> 63 87 80 00 00 00 4c 8b 26 48 29 c6 48 83 3d 35 f8 01 08 00 0f
RSP: 0018:ffffc900151afbb0 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: 0000000000000286 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffff888000000000 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000000000
R13: ffffc900151afbf0 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f053e67f8c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002ec22000 CR3: 000000021afce000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400