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: 1 PID: 32242 Comm: systemd-udevd Not tainted 5.12.0-rc8-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 38 8a b4 0c 00 0f 84 2f 12 00 00 83 3d 37 7a 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 9a 64 00 48 8b RSP: 0018:ffffc9000298f540 EFLAGS: 00010006 RAX: 0000000000000027 RBX: 0000000000000000 RCX: 1ffff92000531ec8 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000138 RBP: ffffc9000298f8d0 R08: dffffc0000000000 R09: 0000000000000000 R10: fffffbfff1c29956 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 FS: 00007ffaa4ef88c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007feba6168000 CR3: 000000007cd30000 CR4: 00000000001506e0 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/0x1e0 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 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ffaa403e270 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:00007ffc6c908cf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007ffaa403e270 RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007ffaa4ef8710 R08: 0000000000000045 R09: 0000000000000018 R10: 0000563461151238 R11: 0000000000000246 R12: 0000000000000000 R13: 0000563461142780 R14: 0000000000000003 R15: 000000000000000e Modules linked in: ---[ end trace 9aefbc4dccabe3fe ]--- 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 38 8a b4 0c 00 0f 84 2f 12 00 00 83 3d 37 7a 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 9a 64 00 48 8b RSP: 0018:ffffc9000298f540 EFLAGS: 00010006 RAX: 0000000000000027 RBX: 0000000000000000 RCX: 1ffff92000531ec8 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000138 RBP: ffffc9000298f8d0 R08: dffffc0000000000 R09: 0000000000000000 R10: fffffbfff1c29956 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 FS: 00007ffaa4ef88c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007feba6168000 CR3: 000000007cd30000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400