[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.67' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 37.979840] netlink: 4 bytes leftover after parsing attributes in process `syz-executor810'. [ 37.988557] netlink: 4 bytes leftover after parsing attributes in process `syz-executor810'. [ 37.997690] netlink: 4 bytes leftover after parsing attributes in process `syz-executor810'. [ 38.006690] netlink: 4 bytes leftover after parsing attributes in process `syz-executor810'. [ 38.015533] netlink: 4 bytes leftover after parsing attributes in process `syz-executor810'. executing program executing program [ 38.084028] netlink: 4 bytes leftover after parsing attributes in process `syz-executor810'. [ 38.092849] netlink: 4 bytes leftover after parsing attributes in process `syz-executor810'. [ 38.101541] netlink: 4 bytes leftover after parsing attributes in process `syz-executor810'. [ 38.110222] netlink: 4 bytes leftover after parsing attributes in process `syz-executor810'. [ 38.118946] netlink: 4 bytes leftover after parsing attributes in process `syz-executor810'. [ 38.128514] block nbd0: NBD_DISCONNECT [ 38.133085] kasan: CONFIG_KASAN_INLINE enabled [ 38.135101] nbd: nbd0 already in use [ 38.137676] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.137689] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.137700] CPU: 0 PID: 8121 Comm: systemd-udevd Not tainted 4.19.211-syzkaller #0 [ 38.137706] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.137724] RIP: 0010:__lock_acquire+0x1eb/0x3ff0 [ 38.137734] Code: 2b 29 00 00 48 81 c4 98 01 00 00 44 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 b3 2a 00 00 49 81 3e 20 f2 66 8c 0f 84 65 ff ff [ 38.137744] RSP: 0018:ffff88809532f910 EFLAGS: 00010006 [ 38.201436] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 38.208687] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000001 [ 38.215942] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 38.223192] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 38.230442] R13: ffff8880b298c080 R14: 0000000000000110 R15: 0000000000000001 [ 38.237689] FS: 00007f6ab0e158c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 38.245888] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.251748] CR2: 00007ffd51bba02c CR3: 00000000b018d000 CR4: 00000000003406f0 [ 38.258996] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.266243] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.273569] Call Trace: [ 38.276321] ? __lock_acquire+0x6de/0x3ff0 [ 38.280549] ? mark_held_locks+0xf0/0xf0 [ 38.284589] ? __lock_acquire+0x6de/0x3ff0 [ 38.288803] ? mark_held_locks+0xf0/0xf0 [ 38.292915] ? __free_object+0xdd/0x1e0 [ 38.296880] ? mark_held_locks+0xf0/0xf0 [ 38.300943] ? mark_held_locks+0xa6/0xf0 [ 38.304986] lock_acquire+0x170/0x3c0 [ 38.308770] ? flush_workqueue+0xe8/0x13e0 [ 38.312998] flush_workqueue+0x117/0x13e0 [ 38.317127] ? flush_workqueue+0xe8/0x13e0 [ 38.321340] ? lock_downgrade+0x720/0x720 [ 38.325466] ? hctx_unlock+0x83/0x140 [ 38.329253] ? check_flush_dependency+0x400/0x400 [ 38.334076] nbd_disconnect_and_put+0x100/0x190 [ 38.338724] nbd_release+0x144/0x170 [ 38.342415] ? nbd_queue_rq+0xe60/0xe60 [ 38.346366] __blkdev_put+0x636/0x870 [ 38.350143] ? fsync_bdev+0xc0/0xc0 [ 38.353747] ? locks_remove_file+0x2cd/0x450 [ 38.358134] ? blkdev_put+0x85/0x520 [ 38.361826] ? blkdev_put+0x520/0x520 [ 38.365606] blkdev_close+0x86/0xb0 [ 38.369216] __fput+0x2ce/0x890 [ 38.372475] task_work_run+0x148/0x1c0 [ 38.376482] exit_to_usermode_loop+0x251/0x2a0 [ 38.381047] do_syscall_64+0x538/0x620 [ 38.384917] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.390108] RIP: 0033:0x7f6aaff5b270 [ 38.393803] 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 [ 38.412682] RSP: 002b:00007ffc3020ff28 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 38.420451] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f6aaff5b270 [ 38.427696] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 [ 38.434945] RBP: 00007f6ab0e15710 R08: 0000000000000045 R09: 0000000000000018 [ 38.442193] R10: 00005598e50f3c48 R11: 0000000000000246 R12: 0000000000000000 [ 38.449440] R13: 00005598e50f3cd0 R14: 0000000000000003 R15: 000000000000000e [ 38.456949] Modules linked in: [ 38.460125] ---[ end trace b6b0abfd031c2af8 ]--- [ 38.464861] RIP: 0010:__lock_acquire+0x1eb/0x3ff0 [ 38.469686] Code: 2b 29 00 00 48 81 c4 98 01 00 00 44 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 b3 2a 00 00 49 81 3e 20 f2 66 8c 0f 84 65 ff ff [ 38.488562] RSP: 0018:ffff88809532f910 EFLAGS: 00010006 [ 38.493901] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 38.501157] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000001 [ 38.508422] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 38.515689] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 38.522934] R13: ffff8880b298c080 R14: 0000000000000110 R15: 0000000000000001 [ 38.530180] FS: 00007f6ab0e158c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 38.538393] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.544250] CR2: 00007ffd51bba02c CR3: 00000000b018d000 CR4: 00000000003406f0 [ 38.551499] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.558744] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.565992] Kernel panic - not syncing: Fatal exception [ 38.571635] Kernel Offset: disabled [ 38.575329] Rebooting in 86400 seconds..