[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.67' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 70.636265][ T8414] netlink: 4 bytes leftover after parsing attributes in process `syz-executor828'. executing program executing program [ 70.744357][ T8419] netlink: 4 bytes leftover after parsing attributes in process `syz-executor828'. executing program [ 70.829227][ T8424] netlink: 4 bytes leftover after parsing attributes in process `syz-executor828'. executing program [ 70.899313][ T8429] netlink: 4 bytes leftover after parsing attributes in process `syz-executor828'. executing program [ 70.979561][ T8434] netlink: 4 bytes leftover after parsing attributes in process `syz-executor828'. executing program [ 71.049294][ T8439] netlink: 4 bytes leftover after parsing attributes in process `syz-executor828'. executing program [ 71.128884][ T8444] netlink: 4 bytes leftover after parsing attributes in process `syz-executor828'. executing program [ 71.218582][ T8449] netlink: 4 bytes leftover after parsing attributes in process `syz-executor828'. executing program [ 71.309069][ T8454] netlink: 4 bytes leftover after parsing attributes in process `syz-executor828'. executing program [ 71.378713][ T8459] netlink: 4 bytes leftover after parsing attributes in process `syz-executor828'. 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 executing program executing program executing program executing program executing program [ 73.937553][ T8669] block nbd0: NBD_DISCONNECT [ 73.950527][ T8669] general protection fault, probably for non-canonical address 0xdffffc0000000027: 0000 [#1] PREEMPT SMP KASAN [ 73.962264][ T8669] KASAN: null-ptr-deref in range [0x0000000000000138-0x000000000000013f] [ 73.970676][ T8669] CPU: 1 PID: 8669 Comm: systemd-udevd Not tainted 5.12.0-rc6-syzkaller #0 [ 73.979267][ T8669] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.989325][ T8669] RIP: 0010:__lock_acquire+0xcfe/0x54c0 [ 73.994904][ T8669] Code: 09 0e 41 bf 01 00 00 00 0f 86 8c 00 00 00 89 05 48 99 09 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 43 38 8f 0f 84 d0 f3 ff [ 74.014698][ T8669] RSP: 0018:ffffc90001b3f938 EFLAGS: 00010006 [ 74.020780][ T8669] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 74.029807][ T8669] RDX: 0000000000000027 RSI: 1ffff92000367f38 RDI: 0000000000000138 [ 74.038167][ T8669] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 74.047715][ T8669] R10: 0000000000000001 R11: 0000000000000000 R12: ffff888028683880 [ 74.057713][ T8669] R13: 0000000000000000 R14: 0000000000000138 R15: 0000000000000000 [ 74.065694][ T8669] FS: 00007fa3d99718c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 74.074632][ T8669] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.081239][ T8669] CR2: 00007ffd5c84efb8 CR3: 0000000020a8c000 CR4: 00000000001506e0 [ 74.089214][ T8669] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 74.097187][ T8669] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 74.105165][ T8669] Call Trace: [ 74.108451][ T8669] ? __lock_acquire+0xb43/0x54c0 [ 74.113401][ T8669] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 74.119582][ T8669] lock_acquire+0x1ab/0x740 [ 74.124123][ T8669] ? flush_workqueue+0xe1/0x13e0 [ 74.129066][ T8669] ? lock_release+0x720/0x720 [ 74.133748][ T8669] ? lockdep_init_map_type+0x2c3/0x7b0 [ 74.139208][ T8669] ? hctx_unlock+0xb9/0x170 [ 74.143717][ T8669] ? lockdep_init_map_type+0x2c3/0x7b0 [ 74.149211][ T8669] flush_workqueue+0x110/0x13e0 [ 74.154073][ T8669] ? flush_workqueue+0xe1/0x13e0 [ 74.159542][ T8669] ? lock_downgrade+0x6e0/0x6e0 [ 74.164408][ T8669] ? hctx_unlock+0xe4/0x170 [ 74.168924][ T8669] ? check_flush_dependency+0x400/0x400 [ 74.174487][ T8669] nbd_disconnect_and_put+0x94/0x120 [ 74.179779][ T8669] nbd_release+0x165/0x1a0 [ 74.184214][ T8669] ? nbd_genl_disconnect+0x540/0x540 [ 74.189504][ T8669] __blkdev_put+0x54e/0x800 [ 74.194019][ T8669] ? __mutex_unlock_slowpath+0xe2/0x610 [ 74.199588][ T8669] ? freeze_bdev+0x250/0x250 [ 74.204188][ T8669] ? wait_for_completion_io+0x270/0x270 [ 74.209853][ T8669] ? _raw_spin_unlock+0x24/0x40 [ 74.214833][ T8669] ? locks_remove_file+0x312/0x560 [ 74.219958][ T8669] blkdev_put+0x92/0x580 [ 74.224218][ T8669] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 74.230470][ T8669] blkdev_close+0x8c/0xb0 [ 74.234832][ T8669] __fput+0x288/0x920 [ 74.238935][ T8669] ? blkdev_put+0x580/0x580 [ 74.243463][ T8669] task_work_run+0xdd/0x1a0 [ 74.248243][ T8669] exit_to_user_mode_prepare+0x249/0x250 [ 74.254758][ T8669] syscall_exit_to_user_mode+0x19/0x60 [ 74.260222][ T8669] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 74.266131][ T8669] RIP: 0033:0x7fa3d8ab7270 [ 74.270568][ T8669] 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 [ 74.290213][ T8669] RSP: 002b:00007ffd5c856ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 74.298634][ T8669] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fa3d8ab7270 [ 74.306661][ T8669] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 [ 74.314633][ T8669] RBP: 00007fa3d9971710 R08: 0000000000000045 R09: 0000000000000018 [ 74.322792][ T8669] R10: 000055827e5a1018 R11: 0000000000000246 R12: 0000000000000000 [ 74.330761][ T8669] R13: 000055827e5a0500 R14: 0000000000000003 R15: 000000000000000e [ 74.338739][ T8669] Modules linked in: [ 74.342637][ T8669] ---[ end trace c92821ac92dd0915 ]--- [ 74.348094][ T8669] RIP: 0010:__lock_acquire+0xcfe/0x54c0 [ 74.353653][ T8669] Code: 09 0e 41 bf 01 00 00 00 0f 86 8c 00 00 00 89 05 48 99 09 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 43 38 8f 0f 84 d0 f3 ff [ 74.373292][ T8669] RSP: 0018:ffffc90001b3f938 EFLAGS: 00010006 [ 74.379384][ T8669] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 74.387363][ T8669] RDX: 0000000000000027 RSI: 1ffff92000367f38 RDI: 0000000000000138 [ 74.395336][ T8669] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 74.403305][ T8669] R10: 0000000000000001 R11: 0000000000000000 R12: ffff888028683880 [ 74.413284][ T8669] R13: 0000000000000000 R14: 0000000000000138 R15: 0000000000000000 [ 74.421285][ T8669] FS: 00007fa3d99718c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 74.430515][ T8669] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.437124][ T8669] CR2: 00007ffd5c84efb8 CR3: 0000000020a8c000 CR4: 00000000001506e0 [ 74.445105][ T8669] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 74.453264][ T8669] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 74.461416][ T8669] Kernel panic - not syncing: Fatal exception [ 74.467954][ T8669] Kernel Offset: disabled [ 74.472371][ T8669] Rebooting in 86400 seconds..