block nbd0: NBD_DISCONNECT
general protection fault, probably for non-canonical address 0xdffffc0000000027: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000138-0x000000000000013f]
CPU: 0 PID: 7536 Comm: syz-executor.0 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_acquire+0xf2/0x6040 kernel/locking/lockdep.c:4771
Code: 89 bc 24 80 00 00 00 0f 85 fb 26 00 00 83 3d 58 93 b5 0c 00 0f 84 2f 12 00 00 83 3d 87 7e 5d 0b 00 74 39 48 89 f8 48 c1 e8 03 <42> 80 3c 00 00 74 1f 48 8b bc 24 80 00 00 00 e8 aa 9b 64 00 48 8b
RSP: 0018:ffffc90014bf7500 EFLAGS: 00010006
RAX: 0000000000000027 RBX: 0000000000000000 RCX: 1ffff9200297eec0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000138
RBP: ffffc90014bf7890 R08: dffffc0000000000 R09: 0000000000000000
R10: fffffbfff1c2ba3e R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000001abd400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004d120c CR3: 000000002b86d000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5511
 flush_workqueue+0x178/0x1750 kernel/workqueue.c:2786
 nbd_disconnect_and_put+0x126/0x1f0 drivers/block/nbd.c:1983
 nbd_release+0xf1/0x120 drivers/block/nbd.c:1504
 __blkdev_put+0x55c/0x6d0 fs/block_dev.c:1592
 blkdev_put+0x2cd/0x440 fs/block_dev.c:1645
 blkdev_close+0x7a/0xa0 fs/block_dev.c:1653
 __fput+0x352/0x7b0 fs/file_table.c:280
 task_work_run+0x146/0x1c0 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+0x10b/0x200 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x26/0x70 kernel/entry/common.c:301
 do_syscall_64+0x4b/0xb0 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x41940b
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007ffe1577f6f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 000000000041940b
RDX: 00000000005704d0 RSI: 0000000008ebcd2f RDI: 0000000000000007
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b309217f4
R10: 00007ffe1577f7e0 R11: 0000000000000293 R12: 0000000000257c19
R13: 00000000000003e8 R14: 000000000056bf60 R15: 0000000000257b72
Modules linked in:

---[ end trace 4ebc302140c27e71 ]---
RIP: 0010:__lock_acquire+0xf2/0x6040 kernel/locking/lockdep.c:4771
Code: 89 bc 24 80 00 00 00 0f 85 fb 26 00 00 83 3d 58 93 b5 0c 00 0f 84 2f 12 00 00 83 3d 87 7e 5d 0b 00 74 39 48 89 f8 48 c1 e8 03 <42> 80 3c 00 00 74 1f 48 8b bc 24 80 00 00 00 e8 aa 9b 64 00 48 8b
RSP: 0018:ffffc90014bf7500 EFLAGS: 00010006

RAX: 0000000000000027 RBX: 0000000000000000 RCX: 1ffff9200297eec0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000138
RBP: ffffc90014bf7890 R08: dffffc0000000000 R09: 0000000000000000
R10: fffffbfff1c2ba3e R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000001abd400(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004d120c CR3: 000000002b86d000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400