[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   18.623825] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.604565] random: sshd: uninitialized urandom read (32 bytes read)
[   23.926596] random: sshd: uninitialized urandom read (32 bytes read)
[   24.646733] random: sshd: uninitialized urandom read (32 bytes read)
[   24.817741] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts.
[   30.409646] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   30.505836] EXT4-fs error (device loop0): ext4_iget:4756: inode #2: comm syz-executor909: root inode unallocated
[   30.517294] Kernel panic - not syncing: EXT4-fs (device loop0): panic forced after error
[   30.517294] 
[   30.527007] CPU: 1 PID: 4451 Comm: syz-executor909 Not tainted 4.17.0-rc3+ #34
[   30.534350] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.543785] Call Trace:
[   30.546359]  dump_stack+0x1b9/0x294
[   30.549973]  ? dump_stack_print_info.cold.2+0x52/0x52
[   30.555149]  ? __might_sleep+0x95/0x190
[   30.559110]  panic+0x22f/0x4de
[   30.562285]  ? add_taint.cold.5+0x16/0x16
[   30.566422]  ? ext4_handle_error.part.120+0x176/0x340
[   30.571611]  ext4_handle_error.part.120.cold.128+0x1d/0x1d
[   30.577220]  __ext4_error_inode+0x351/0x730
[   30.581548]  ? __ext4_error+0x560/0x560
[   30.585508]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   30.591026]  ? __ext4_get_inode_loc+0x538/0x14a0
[   30.595775]  ? do_raw_spin_trylock+0x1b0/0x1b0
[   30.600353]  ? ext4_journalled_set_page_dirty+0x20/0x20
[   30.605700]  ? iget_locked+0x18c/0x560
[   30.609575]  ? iget5_locked+0x570/0x570
[   30.613536]  ? workqueue_sysfs_register+0x3f0/0x3f0
[   30.618548]  ext4_iget+0xe82/0x3dd0
[   30.622159]  ? __might_sleep+0x95/0x190
[   30.626119]  ? ext4_get_projid+0x190/0x190
[   30.630338]  ? __lock_is_held+0xb5/0x140
[   30.634387]  ? free_unref_page+0x9d0/0x9d0
[   30.638604]  ? rcu_note_context_switch+0x710/0x710
[   30.643518]  ? check_same_owner+0x320/0x320
[   30.647826]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   30.653346]  ? free_pages+0x50/0x90
[   30.656959]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   30.662482]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   30.668002]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   30.673524]  ext4_fill_super+0x733c/0xd810
[   30.677757]  ? ext4_calculate_overhead+0x11c0/0x11c0
[   30.682844]  ? string+0x21d/0x2c0
[   30.686288]  ? widen_string+0x2d0/0x2d0
[   30.690242]  ? sget_userns+0x2dd/0xf00
[   30.694110]  ? find_held_lock+0x13f/0x1c0
[   30.698240]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   30.703756]  ? bdev_name.isra.7+0x1a1/0x1f0
[   30.708061]  ? pointer+0x1b0/0xa20
[   30.711584]  ? netdev_bits+0xb0/0xb0
[   30.715276]  ? format_decode+0x1a9/0xae0
[   30.719319]  ? set_precision+0xe0/0xe0
[   30.723191]  ? __sanitizer_cov_trace_switch+0x53/0x90
[   30.728365]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   30.733885]  ? vsnprintf+0x242/0x1b40
[   30.737675]  ? pointer+0xa20/0xa20
[   30.741201]  ? snprintf+0xa5/0xd0
[   30.744636]  ? vsprintf+0x40/0x40
[   30.748077]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
[   30.753075]  ? set_blocksize+0x2c4/0x350
[   30.757122]  mount_bdev+0x30c/0x3e0
[   30.760733]  ? ext4_calculate_overhead+0x11c0/0x11c0
[   30.765818]  ? mount_bdev+0x30c/0x3e0
[   30.769614]  ? ext4_calculate_overhead+0x11c0/0x11c0
[   30.774711]  ext4_mount+0x34/0x40
[   30.778149]  mount_fs+0xae/0x328
[   30.781511]  vfs_kern_mount.part.34+0xd4/0x4d0
[   30.786078]  ? may_umount+0xb0/0xb0
[   30.789698]  ? _raw_read_unlock+0x22/0x30
[   30.793838]  ? __get_fs_type+0x97/0xc0
[   30.797712]  do_mount+0x564/0x3070
[   30.801234]  ? copy_mount_string+0x40/0x40
[   30.805451]  ? rcu_pm_notify+0xc0/0xc0
[   30.809326]  ? copy_mount_options+0x5f/0x380
[   30.813742]  ? rcu_read_lock_sched_held+0x108/0x120
[   30.818744]  ? kmem_cache_alloc_trace+0x616/0x780
[   30.823584]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   30.829107]  ? _copy_from_user+0xdf/0x150
[   30.833240]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   30.838759]  ? copy_mount_options+0x285/0x380
[   30.843238]  ksys_mount+0x12d/0x140
[   30.846847]  __x64_sys_mount+0xbe/0x150
[   30.850811]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   30.855814]  do_syscall_64+0x1b1/0x800
[   30.859693]  ? syscall_return_slowpath+0x5c0/0x5c0
[   30.864616]  ? syscall_return_slowpath+0x30f/0x5c0
[   30.869534]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   30.874968]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   30.879795]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   30.884964] RIP: 0033:0x442dda
[   30.888131] RSP: 002b:00007ffdadaf1e38 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5
[   30.895820] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442dda
[   30.903070] RDX: 0000000020000480 RSI: 0000000020000100 RDI: 00007ffdadaf1e40
[   30.910405] RBP: 0000000000000004 R08: 0000000020000440 R09: 000000000000000a
[   30.917658] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000401c40
[   30.924909] R13: 0000000000401cd0 R14: 0000000000000000 R15: 0000000000000000
[   30.932713] Dumping ftrace buffer:
[   30.936362]    (ftrace buffer empty)
[   30.940577] Kernel Offset: disabled
[   30.944198] Rebooting in 86400 seconds..