[ 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 '10.128.1.47' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 30.598598] block nbd0: NBD_DISCONNECT [ 30.602705] kasan: CONFIG_KASAN_INLINE enabled [ 30.607267] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 30.614603] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.621417] Modules linked in: [ 30.624606] CPU: 1 PID: 7980 Comm: syz-executor210 Not tainted 4.14.290-syzkaller #0 [ 30.632493] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 30.641862] task: ffff8880a9352640 task.stack: ffff8880a5760000 [ 30.647900] RIP: 0010:__lock_acquire+0x1cc/0x3f20 [ 30.652723] RSP: 0018:ffff8880a57673b0 EFLAGS: 00010006 [ 30.658063] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 30.665335] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000110 [ 30.672596] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 30.679843] R10: 0000000000000001 R11: ffff8880a9352640 R12: 0000000000000110 [ 30.687088] R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8beccd80 [ 30.694356] FS: 00005555562b5300(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 30.702556] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.708412] CR2: 0000000020000040 CR3: 00000000b1a0d000 CR4: 00000000003406e0 [ 30.715659] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.722909] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.730170] Call Trace: [ 30.732763] ? vprintk_emit+0x170/0x620 [ 30.736726] ? dev_vprintk_emit+0x1da/0x440 [ 30.741021] ? trace_hardirqs_on+0x10/0x10 [ 30.745228] ? dev_driver_string+0x160/0x160 [ 30.750774] ? trace_hardirqs_on+0x10/0x10 [ 30.755764] lock_acquire+0x170/0x3f0 [ 30.759537] ? flush_workqueue+0xcb/0x1310 [ 30.763751] flush_workqueue+0xfa/0x1310 [ 30.767809] ? flush_workqueue+0xcb/0x1310 [ 30.772022] ? nbd_disconnect_and_put+0x99/0x140 [ 30.776752] ? lock_downgrade+0x740/0x740 [ 30.780876] ? check_flush_dependency+0x2a0/0x2a0 [ 30.785705] nbd_disconnect_and_put+0xc3/0x140 [ 30.790266] nbd_genl_disconnect+0x1fa/0x320 [ 30.794650] genl_family_rcv_msg+0x572/0xb20 [ 30.799050] ? genl_rcv+0x40/0x40 [ 30.802479] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 30.807908] ? __kmalloc_node_track_caller+0x4c/0x70 [ 30.812989] ? trace_hardirqs_on+0x10/0x10 [ 30.817213] genl_rcv_msg+0xaf/0x140 [ 30.820902] netlink_rcv_skb+0x125/0x390 [ 30.824954] ? genl_family_rcv_msg+0xb20/0xb20 [ 30.829510] ? netlink_ack+0x9a0/0x9a0 [ 30.833370] ? lock_acquire+0x170/0x3f0 [ 30.837336] genl_rcv+0x24/0x40 [ 30.840587] netlink_unicast+0x437/0x610 [ 30.844620] ? netlink_sendskb+0xd0/0xd0 [ 30.848658] ? __check_object_size+0x179/0x230 [ 30.853216] netlink_sendmsg+0x648/0xbc0 [ 30.857250] ? nlmsg_notify+0x1b0/0x1b0 [ 30.861211] ? kernel_recvmsg+0x210/0x210 [ 30.865331] ? security_socket_sendmsg+0x83/0xb0 [ 30.870060] ? nlmsg_notify+0x1b0/0x1b0 [ 30.874008] sock_sendmsg+0xb5/0x100 [ 30.877697] ___sys_sendmsg+0x6c8/0x800 [ 30.881651] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 30.886379] ? netlink_dump+0xb90/0xb90 [ 30.890324] ? nlmsg_notify+0x1b0/0x1b0 [ 30.894270] ? security_socket_recvmsg+0x8b/0xc0 [ 30.898998] ? SyS_recvfrom+0x27f/0x340 [ 30.902942] ? SyS_send+0x40/0x40 [ 30.906369] ? __fdget+0x167/0x1f0 [ 30.909882] ? sockfd_lookup_light+0xb2/0x160 [ 30.914348] __sys_sendmsg+0xa3/0x120 [ 30.918121] ? SyS_shutdown+0x160/0x160 [ 30.922068] ? move_addr_to_kernel+0x60/0x60 [ 30.926447] ? __do_page_fault+0x159/0xad0 [ 30.930657] SyS_sendmsg+0x27/0x40 [ 30.934169] ? __sys_sendmsg+0x120/0x120 [ 30.938218] do_syscall_64+0x1d5/0x640 [ 30.942087] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 30.947259] RIP: 0033:0x7f8e894441a9 [ 30.950946] RSP: 002b:00007ffecdc0bb18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 30.958638] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8e894441a9 [ 30.965881] RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000004 [ 30.973128] RBP: 00007f8e894037d0 R08: 0000000000000000 R09: 0000000000000000 [ 30.980371] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8e89403860 [ 30.987640] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 30.994899] Code: 18 00 00 00 00 48 81 c4 80 01 00 00 44 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 67 2a 00 00 49 81 3c 24 e0 87 2f 8b 0f 84 5f [ 31.013959] RIP: __lock_acquire+0x1cc/0x3f20 RSP: ffff8880a57673b0 [ 31.020254] ---[ end trace 5fa6acf5cb8b1695 ]--- [ 31.024981] Kernel panic - not syncing: Fatal exception [ 31.030557] Kernel Offset: disabled [ 31.034269] Rebooting in 86400 seconds..