Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.83' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 33.628122] netlink: 4 bytes leftover after parsing attributes in process `syz-executor608'. executing program executing program [ 33.691489] netlink: 4 bytes leftover after parsing attributes in process `syz-executor608'. executing program [ 33.741062] netlink: 4 bytes leftover after parsing attributes in process `syz-executor608'. executing program [ 33.789137] netlink: 4 bytes leftover after parsing attributes in process `syz-executor608'. executing program [ 33.829870] netlink: 4 bytes leftover after parsing attributes in process `syz-executor608'. executing program [ 33.879606] netlink: 4 bytes leftover after parsing attributes in process `syz-executor608'. [ 33.919010] netlink: 4 bytes leftover after parsing attributes in process `syz-executor608'. executing program executing program [ 33.970000] netlink: 4 bytes leftover after parsing attributes in process `syz-executor608'. executing program [ 34.020604] netlink: 4 bytes leftover after parsing attributes in process `syz-executor608'. executing program [ 34.070003] netlink: 4 bytes leftover after parsing attributes in process `syz-executor608'. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.334725] block nbd0: NBD_DISCONNECT [ 35.341921] kasan: CONFIG_KASAN_INLINE enabled [ 35.346647] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 35.354004] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 35.360217] CPU: 0 PID: 8368 Comm: systemd-udevd Not tainted 4.19.191-syzkaller #0 [ 35.367987] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.377329] RIP: 0010:__lock_acquire+0x1eb/0x3ff0 [ 35.382147] 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 b2 66 8c 0f 84 65 ff ff [ 35.401026] RSP: 0018:ffff8880af2cf910 EFLAGS: 00010006 [ 35.406367] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 35.413622] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000001 [ 35.420878] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 35.428135] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 35.435548] R13: ffff888093ce6180 R14: 0000000000000110 R15: 0000000000000001 [ 35.442807] FS: 00007fb34b4a38c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 35.451031] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.456918] CR2: 00007fb34a322f60 CR3: 000000009e3b5000 CR4: 00000000001406f0 [ 35.464172] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.471440] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.478697] Call Trace: [ 35.481272] ? __lock_acquire+0x6de/0x3ff0 [ 35.485602] ? mark_held_locks+0xf0/0xf0 [ 35.489640] ? __lock_acquire+0x6de/0x3ff0 [ 35.493862] ? mark_held_locks+0xf0/0xf0 [ 35.498082] ? __free_object+0xdd/0x1e0 [ 35.502099] ? mark_held_locks+0xf0/0xf0 [ 35.506150] ? mark_held_locks+0xa6/0xf0 [ 35.510193] lock_acquire+0x170/0x3c0 [ 35.513975] ? flush_workqueue+0xe8/0x13e0 [ 35.518191] flush_workqueue+0x117/0x13e0 [ 35.522319] ? flush_workqueue+0xe8/0x13e0 [ 35.526540] ? lock_downgrade+0x720/0x720 [ 35.530672] ? hctx_unlock+0x83/0x140 [ 35.534455] ? check_flush_dependency+0x400/0x400 [ 35.539282] nbd_disconnect_and_put+0x100/0x190 [ 35.543932] nbd_release+0x144/0x170 [ 35.547623] ? nbd_queue_rq+0xe60/0xe60 [ 35.551669] __blkdev_put+0x636/0x870 [ 35.555449] ? fsync_bdev+0xc0/0xc0 [ 35.559054] ? locks_remove_file+0x2cd/0x450 [ 35.563447] ? blkdev_put+0x85/0x520 [ 35.567151] ? blkdev_put+0x520/0x520 [ 35.571036] blkdev_close+0x86/0xb0 [ 35.574646] __fput+0x2ce/0x890 [ 35.577907] task_work_run+0x148/0x1c0 [ 35.581775] exit_to_usermode_loop+0x251/0x2a0 [ 35.586342] do_syscall_64+0x538/0x620 [ 35.590214] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.595397] RIP: 0033:0x7fb34a5e9270 [ 35.599122] 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 [ 35.618110] RSP: 002b:00007ffc14eb5948 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 35.625802] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fb34a5e9270 [ 35.633058] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 [ 35.640315] RBP: 00007fb34b4a3710 R08: 0000000000000045 R09: 0000000000000018 [ 35.647564] R10: 000055f5333541b8 R11: 0000000000000246 R12: 0000000000000000 [ 35.654812] R13: 000055f533355040 R14: 0000000000000003 R15: 000000000000000e [ 35.662102] Modules linked in: [ 35.665317] ---[ end trace d6bada1cfce31e2f ]--- [ 35.670070] RIP: 0010:__lock_acquire+0x1eb/0x3ff0 [ 35.674900] 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 b2 66 8c 0f 84 65 ff ff [ 35.693784] RSP: 0018:ffff8880af2cf910 EFLAGS: 00010006 [ 35.699124] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 35.706375] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000001 [ 35.713625] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 35.720892] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 35.728145] R13: ffff888093ce6180 R14: 0000000000000110 R15: 0000000000000001 [ 35.735537] FS: 00007fb34b4a38c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 35.743760] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.749646] CR2: 00007fb34a322f60 CR3: 000000009e3b5000 CR4: 00000000001406f0 [ 35.756898] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.764162] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.771411] Kernel panic - not syncing: Fatal exception [ 35.776806] Kernel Offset: disabled [ 35.780430] Rebooting in 86400 seconds..