[?25l[?1c7[ ok 8[?25h[?0c. [ 31.613222] random: sshd: uninitialized urandom read (32 bytes read) [ 31.900892] kauditd_printk_skb: 10 callbacks suppressed [ 31.900899] audit: type=1400 audit(1572353036.618:35): avc: denied { map } for pid=6931 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 31.956932] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 32.535682] random: sshd: uninitialized urandom read (32 bytes read) [ 325.192906] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.1.56' (ECDSA) to the list of known hosts. [ 330.744327] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 330.867877] audit: type=1400 audit(1572353335.578:36): avc: denied { map } for pid=6945 comm="syz-executor225" path="/root/syz-executor225508502" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 331.044633] block nbd0: Device being setup by another task [ 331.166871] block nbd0: shutting down sockets [ 571.350236] INFO: task syz-executor225:6946 blocked for more than 140 seconds. [ 571.357725] Not tainted 4.14.151 #0 [ 571.361939] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 571.369917] syz-executor225 D28048 6946 6943 0x00000004 [ 571.375626] Call Trace: [ 571.378374] __schedule+0x7b8/0x1cd0 [ 571.382203] ? pci_mmcfg_check_reserved+0x150/0x150 [ 571.387248] schedule+0x92/0x1c0 [ 571.390700] schedule_timeout+0x93b/0xe10 [ 571.394850] ? wait_for_completion+0x274/0x420 [ 571.399482] ? find_held_lock+0x35/0x130 [ 571.403700] ? usleep_range+0x130/0x130 [ 571.407838] ? wait_for_completion+0x274/0x420 [ 571.412519] ? _raw_spin_unlock_irq+0x28/0x90 [ 571.417016] ? trace_hardirqs_on_caller+0x400/0x590 [ 571.422099] wait_for_completion+0x27c/0x420 [ 571.426609] ? wait_for_completion_interruptible+0x490/0x490 [ 571.432461] ? wake_up_q+0xf0/0xf0 [ 571.436006] flush_workqueue+0x3d1/0x1400 [ 571.440207] ? uevent_store+0x70/0x70 [ 571.444008] ? flush_work+0x730/0x730 [ 571.447796] ? wait_for_completion+0x420/0x420 [ 571.452549] ? sock_shutdown+0x1d9/0x250 [ 571.456740] nbd_ioctl+0x9c4/0xb30 [ 571.460367] ? nbd_ioctl+0x9c4/0xb30 [ 571.464129] ? nbd_add_socket+0x5e0/0x5e0 [ 571.468270] ? finish_wait+0x260/0x260 [ 571.472382] ? do_futex+0x152/0x19e0 [ 571.476103] ? nbd_add_socket+0x5e0/0x5e0 [ 571.480318] blkdev_ioctl+0x96b/0x1860 [ 571.484228] ? blkpg_ioctl+0x980/0x980 [ 571.488109] ? __might_sleep+0x93/0xb0 [ 571.492090] ? __fget+0x210/0x370 [ 571.495544] block_ioctl+0xde/0x120 [ 571.499152] ? blkdev_fallocate+0x3b0/0x3b0 [ 571.503522] do_vfs_ioctl+0x7ae/0x1060 [ 571.507580] ? selinux_file_mprotect+0x5d0/0x5d0 [ 571.512398] ? lock_downgrade+0x740/0x740 [ 571.516548] ? ioctl_preallocate+0x1c0/0x1c0 [ 571.521071] ? __fget+0x237/0x370 [ 571.524538] ? security_file_ioctl+0x7d/0xb0 [ 571.528953] ? security_file_ioctl+0x89/0xb0 [ 571.533560] SyS_ioctl+0x8f/0xc0 [ 571.536930] ? do_vfs_ioctl+0x1060/0x1060 [ 571.541140] do_syscall_64+0x1e8/0x640 [ 571.545049] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 571.549996] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 571.555452] RIP: 0033:0x4496c9 [ 571.558639] RSP: 002b:00007f7d0091ece8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 571.566412] RAX: ffffffffffffffda RBX: 00000000006dac48 RCX: 00000000004496c9 [ 571.573891] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005 [ 571.581401] RBP: 00000000006dac40 R08: 0000000000000000 R09: 0000000000000000 [ 571.588674] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac4c [ 571.596044] R13: 00007ffc7862b8bf R14: 00007f7d0091f9c0 R15: 20c49ba5e353f7cf [ 571.603442] [ 571.603442] Showing all locks held in the system: [ 571.609754] 1 lock held by khungtaskd/1016: [ 571.614204] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7f/0x21f [ 571.623360] 2 locks held by kworker/u5:0/1144: [ 571.628027] #0: ("knbd%d-recv"nbd->index){+.+.}, at: [] process_one_work+0x76e/0x1600 [ 571.637880] #1: ((&args->work)){+.+.}, at: [] process_one_work+0x7ab/0x1600 [ 571.646850] 1 lock held by rsyslogd/6798: [ 571.651124] #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0xab/0xd0 [ 571.659383] 2 locks held by getty/6920: [ 571.663476] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 571.672327] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 571.681653] 2 locks held by getty/6921: [ 571.685620] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 571.694390] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 571.703722] 2 locks held by getty/6922: [ 571.707673] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 571.716393] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 571.725721] 2 locks held by getty/6923: [ 571.729677] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 571.738412] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 571.747749] 2 locks held by getty/6924: [ 571.751759] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 571.760474] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 571.769775] 2 locks held by getty/6925: [ 571.773840] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 571.782572] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 571.791912] 2 locks held by getty/6926: [ 571.795900] #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x33/0x40 [ 571.804661] #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e6/0x17b0 [ 571.814006] [ 571.815616] ============================================= [ 571.815616] [ 571.822668] NMI backtrace for cpu 1 [ 571.826310] CPU: 1 PID: 1016 Comm: khungtaskd Not tainted 4.14.151 #0 [ 571.832871] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 571.842469] Call Trace: [ 571.845114] dump_stack+0x138/0x197 [ 571.848730] nmi_cpu_backtrace.cold+0x57/0x94 [ 571.853204] ? irq_force_complete_move.cold+0x7d/0x7d [ 571.858389] nmi_trigger_cpumask_backtrace+0x141/0x189 [ 571.863654] arch_trigger_cpumask_backtrace+0x14/0x20 [ 571.868835] watchdog+0x5e7/0xb90 [ 571.872456] kthread+0x319/0x430 [ 571.875820] ? hungtask_pm_notify+0x50/0x50 [ 571.880123] ? kthread_create_on_node+0xd0/0xd0 [ 571.884804] ret_from_fork+0x24/0x30 [ 571.888614] Sending NMI from CPU 1 to CPUs 0: [ 571.893201] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff861c3b5e [ 571.894152] Kernel panic - not syncing: hung_task: blocked tasks [ 571.907792] CPU: 1 PID: 1016 Comm: khungtaskd Not tainted 4.14.151 #0 [ 571.914368] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 571.923705] Call Trace: [ 571.926286] dump_stack+0x138/0x197 [ 571.929908] panic+0x1f9/0x42d [ 571.933097] ? add_taint.cold+0x16/0x16 [ 571.937058] ? irq_force_complete_move.cold+0x7d/0x7d [ 571.943380] watchdog+0x5f8/0xb90 [ 571.946816] kthread+0x319/0x430 [ 571.950161] ? hungtask_pm_notify+0x50/0x50 [ 571.954459] ? kthread_create_on_node+0xd0/0xd0 [ 571.959113] ret_from_fork+0x24/0x30 [ 571.964484] Kernel Offset: disabled [ 571.968121] Rebooting in 86400 seconds..