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: 18850 Comm: systemd-udevd Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0xcfe/0x54c0 kernel/locking/lockdep.c:4771 Code: 0e 0e 41 bf 01 00 00 00 0f 86 8c 00 00 00 89 05 68 14 0e 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 c0 c3 3c 8f 0f 84 d0 f3 ff RSP: 0018:ffffc90003197938 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000027 RSI: 1ffff92000632f38 RDI: 0000000000000138 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888053221c40 R13: 0000000000000000 R14: 0000000000000138 R15: 0000000000000000 FS: 00007ff0bf2198c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000541198 CR3: 0000000073eb7000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5511 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476 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:1592 blkdev_put+0x92/0x580 fs/block_dev.c:1645 blkdev_close+0x8c/0xb0 fs/block_dev.c:1653 __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+0x19/0x60 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ff0be35f270 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:00007ffcedfcecd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007ff0be35f270 RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007ff0bf219710 R08: 0000000000000045 R09: 0000000000000018 R10: 000056530ffbc878 R11: 0000000000000246 R12: 0000000000000000 R13: 000056530ffbf920 R14: 0000000000000003 R15: 000000000000000e Modules linked in: ---[ end trace 11c9823920685149 ]--- RIP: 0010:__lock_acquire+0xcfe/0x54c0 kernel/locking/lockdep.c:4771 Code: 0e 0e 41 bf 01 00 00 00 0f 86 8c 00 00 00 89 05 68 14 0e 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 c0 c3 3c 8f 0f 84 d0 f3 ff RSP: 0018:ffffc90003197938 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000027 RSI: 1ffff92000632f38 RDI: 0000000000000138 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888053221c40 R13: 0000000000000000 R14: 0000000000000138 R15: 0000000000000000 FS: 00007ff0bf2198c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000541198 CR3: 0000000073eb7000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400