BUG: kernel NULL pointer dereference, address: 0000000000000134
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 8ca98067 P4D 8ca98067 PUD a8c9d067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 25947 Comm: udevd Not tainted 5.6.0-rc6-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+0x28/0x140 mm/kasan/quarantine.c:167
Code: d6 90 41 57 41 56 41 55 41 54 55 53 48 8b 1f 48 85 db 0f 84 08 01 00 00 48 89 f5 49 89 fd 48 85 ed 49 89 ee 0f 84 8b 00 00 00 <49> 63 86 34 01 00 00 4c 8b 23 48 29 c3 48 83 3d 4b ce c4 07 00 0f
RSP: 0018:ffffc90006a87cc0 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: ffff888000000000 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffffffff813345aa RDI: 0000000000000007
RBP: 0000000000000000 R08: ffff888078d145c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000000000
R13: ffffc90006a87cf8 R14: 0000000000000000 R15: 0000000000000286
FS:  00007f227fa7e7a0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000134 CR3: 0000000064800000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 quarantine_reduce+0x159/0x190 mm/kasan/quarantine.c:260
 __kasan_kmalloc.constprop.0+0x97/0xd0 mm/kasan/common.c:496
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x11b/0x730 mm/slab.c:3484
 getname_flags fs/namei.c:138 [inline]
 getname_flags+0xd2/0x5b0 fs/namei.c:128
 user_path_at_empty+0x2a/0x50 fs/namei.c:2746
 user_path_at include/linux/namei.h:58 [inline]
 inotify_find_inode+0x2e/0x110 fs/notify/inotify/inotify_user.c:340
 __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:745 [inline]
 __se_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:698 [inline]
 __x64_sys_inotify_add_watch+0x1f1/0x350 fs/notify/inotify/inotify_user.c:698
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f227f192a07
Code: f0 ff ff 73 01 c3 48 8b 0d 2e 84 2a 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 b8 fe 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 01 84 2a 00 31 d2 48 29 c2 64
RSP: 002b:00007ffeef9ca418 EFLAGS: 00000206 ORIG_RAX: 00000000000000fe
RAX: ffffffffffffffda RBX: 0000000001931250 RCX: 00007f227f192a07
RDX: 0000000000000008 RSI: 000000000194a510 RDI: 0000000000000006
RBP: 0000000001949e80 R08: 00007f227fa7e7a0 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000206 R12: 0000000000000001
R13: 0000000001936f10 R14: 0000000001931250 R15: 000000000000000b
Modules linked in:
CR2: 0000000000000134
---[ end trace 152b243fed2891fa ]---
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+0x28/0x140 mm/kasan/quarantine.c:167
Code: d6 90 41 57 41 56 41 55 41 54 55 53 48 8b 1f 48 85 db 0f 84 08 01 00 00 48 89 f5 49 89 fd 48 85 ed 49 89 ee 0f 84 8b 00 00 00 <49> 63 86 34 01 00 00 4c 8b 23 48 29 c3 48 83 3d 4b ce c4 07 00 0f
RSP: 0018:ffffc90006a87cc0 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: ffff888000000000 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffffffff813345aa RDI: 0000000000000007
RBP: 0000000000000000 R08: ffff888078d145c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000000000
R13: ffffc90006a87cf8 R14: 0000000000000000 R15: 0000000000000286
FS:  00007f227fa7e7a0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 0000000064800000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600