general protection fault, probably for non-canonical address 0xdffffc0000000027: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000138-0x000000000000013f]
CPU: 1 PID: 10543 Comm: systemd-udevd Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:__lock_acquire+0xcfe/0x54c0 kernel/locking/lockdep.c:4770
Code: 0b 0e 41 bf 01 00 00 00 0f 86 8c 00 00 00 89 05 78 ef 0b 0e e9 81 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 5b 31 00 00 49 81 3e 80 03 3a 8f 0f 84 d0 f3 ff
RSP: 0018:ffffc9002108f938 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000027 RSI: 1ffff92004211f38 RDI: 0000000000000138
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888013e79bc0
R13: 0000000000000000 R14: 0000000000000138 R15: 0000000000000000
FS:  00007f368cf868c0(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f54f6db0 CR3: 000000004ccf2000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire kernel/locking/lockdep.c:5510 [inline]
 lock_acquire+0x1ab/0x730 kernel/locking/lockdep.c:5475
 flush_workqueue+0x110/0x13e0 kernel/workqueue.c:2786
 nbd_disconnect_and_put+0x94/0x120 drivers/block/nbd.c:1983
 nbd_release+0x165/0x1a0 drivers/block/nbd.c:1504
 __blkdev_put+0x54e/0x800 fs/block_dev.c:1579
 blkdev_put+0x92/0x580 fs/block_dev.c:1632
 blkdev_close+0x8c/0xb0 fs/block_dev.c:1640
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f368c0cc270
Code: 73 01 c3 48 8b 0d 38 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 59 c1 20 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24
RSP: 002b:00007fffbc2e90c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f368c0cc270
RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007f368cf86710 R08: 0000000000000045 R09: 0000000000000018
R10: 000055bfa3f58d58 R11: 0000000000000246 R12: 0000000000000000
R13: 000055bfa3f5a020 R14: 0000000000000003 R15: 000000000000000e
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 6c6671bd1ccac061 ]---
RIP: 0010:__lock_acquire+0xcfe/0x54c0 kernel/locking/lockdep.c:4770
Code: 0b 0e 41 bf 01 00 00 00 0f 86 8c 00 00 00 89 05 78 ef 0b 0e e9 81 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 5b 31 00 00 49 81 3e 80 03 3a 8f 0f 84 d0 f3 ff
RSP: 0018:ffffc9002108f938 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000027 RSI: 1ffff92004211f38 RDI: 0000000000000138
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888013e79bc0
R13: 0000000000000000 R14: 0000000000000138 R15: 0000000000000000
FS:  00007f368cf868c0(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f54f6db0 CR3: 000000004ccf2000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400