[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.140' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 35.338830] netlink: 4 bytes leftover after parsing attributes in process `syz-executor564'. [ 35.347557] netlink: 4 bytes leftover after parsing attributes in process `syz-executor564'. [ 35.357097] netlink: 4 bytes leftover after parsing attributes in process `syz-executor564'. [ 35.366193] netlink: 4 bytes leftover after parsing attributes in process `syz-executor564'. [ 35.374774] netlink: 4 bytes leftover after parsing attributes in process `syz-executor564'. executing program executing program [ 35.443538] netlink: 4 bytes leftover after parsing attributes in process `syz-executor564'. [ 35.453100] netlink: 4 bytes leftover after parsing attributes in process `syz-executor564'. [ 35.462292] netlink: 4 bytes leftover after parsing attributes in process `syz-executor564'. [ 35.471180] netlink: 4 bytes leftover after parsing attributes in process `syz-executor564'. [ 35.480243] netlink: 4 bytes leftover after parsing attributes in process `syz-executor564'. [ 35.489213] block nbd0: NBD_DISCONNECT [ 35.493852] kasan: CONFIG_KASAN_INLINE enabled [ 35.497066] nbd: nbd0 already in use [ 35.498428] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 35.498440] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 35.498453] CPU: 1 PID: 8109 Comm: systemd-udevd Not tainted 4.19.211-syzkaller #0 [ 35.523373] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.532713] RIP: 0010:__lock_acquire+0x1eb/0x3ff0 [ 35.537533] 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 [ 35.556423] RSP: 0018:ffff888095537910 EFLAGS: 00010006 [ 35.561762] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 35.569014] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000001 [ 35.576259] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 35.583507] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 35.590766] R13: ffff888095950040 R14: 0000000000000110 R15: 0000000000000001 [ 35.598023] FS: 00007fe6a026a8c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 35.606236] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.612093] CR2: 00007ffcc48f52c8 CR3: 0000000096989000 CR4: 00000000003406e0 [ 35.619353] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.626601] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.633846] Call Trace: [ 35.636419] ? __lock_acquire+0x6de/0x3ff0 [ 35.640635] ? mark_held_locks+0xf0/0xf0 [ 35.644673] ? __lock_acquire+0x6de/0x3ff0 [ 35.648886] ? mark_held_locks+0xf0/0xf0 [ 35.652922] ? __free_object+0xdd/0x1e0 [ 35.656963] ? mark_held_locks+0xf0/0xf0 [ 35.661015] ? mark_held_locks+0xa6/0xf0 [ 35.665072] lock_acquire+0x170/0x3c0 [ 35.669914] ? flush_workqueue+0xe8/0x13e0 [ 35.674219] flush_workqueue+0x117/0x13e0 [ 35.678903] ? flush_workqueue+0xe8/0x13e0 [ 35.683134] ? lock_downgrade+0x720/0x720 [ 35.687276] ? hctx_unlock+0x83/0x140 [ 35.691063] ? check_flush_dependency+0x400/0x400 [ 35.695893] nbd_disconnect_and_put+0x100/0x190 [ 35.700589] nbd_release+0x144/0x170 [ 35.704281] ? nbd_queue_rq+0xe60/0xe60 [ 35.708234] __blkdev_put+0x636/0x870 [ 35.712013] ? fsync_bdev+0xc0/0xc0 [ 35.715617] ? locks_remove_file+0x2cd/0x450 [ 35.720004] ? blkdev_put+0x85/0x520 [ 35.723694] ? blkdev_put+0x520/0x520 [ 35.727497] blkdev_close+0x86/0xb0 [ 35.731112] __fput+0x2ce/0x890 [ 35.734373] task_work_run+0x148/0x1c0 [ 35.738242] exit_to_usermode_loop+0x251/0x2a0 [ 35.742805] do_syscall_64+0x538/0x620 [ 35.746672] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.751842] RIP: 0033:0x7fe69f3b0270 [ 35.755535] 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 [ 35.774501] RSP: 002b:00007fff86ab3ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 35.782185] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fe69f3b0270 [ 35.789433] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 [ 35.796691] RBP: 00007fe6a026a710 R08: 0000000000000045 R09: 0000000000000018 [ 35.804060] R10: 0000562b8df8ec98 R11: 0000000000000246 R12: 0000000000000000 [ 35.811421] R13: 0000562b8df8ed20 R14: 0000000000000003 R15: 000000000000000e [ 35.818689] Modules linked in: [ 35.821874] ---[ end trace 68ff2945ed437ffc ]--- [ 35.826643] RIP: 0010:__lock_acquire+0x1eb/0x3ff0 [ 35.831469] 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 [ 35.850358] RSP: 0018:ffff888095537910 EFLAGS: 00010006 [ 35.855764] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 35.863019] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000001 [ 35.870275] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 35.877529] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 35.884835] R13: ffff888095950040 R14: 0000000000000110 R15: 0000000000000001 [ 35.892123] FS: 00007fe6a026a8c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 35.900329] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.906202] CR2: 00007ffcc48f52c8 CR3: 0000000096989000 CR4: 00000000003406e0 [ 35.913452] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.920705] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.927960] Kernel panic - not syncing: Fatal exception [ 35.933688] Kernel Offset: disabled [ 35.937345] Rebooting in 86400 seconds..