[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   17.781365] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   19.941357] random: sshd: uninitialized urandom read (32 bytes read)
[   20.215447] random: sshd: uninitialized urandom read (32 bytes read)
[   20.959186] random: sshd: uninitialized urandom read (32 bytes read)
[   21.099953] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.15.199' (ECDSA) to the list of known hosts.
[   26.558553] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   26.641734] WARNING: CPU: 0 PID: 4463 at mm/slab_common.c:1031 kmalloc_slab+0x56/0x70
[   26.649855] Kernel panic - not syncing: panic_on_warn set ...
[   26.649855] 
[   26.657218] CPU: 0 PID: 4463 Comm: syz-executor437 Not tainted 4.18.0-rc4-next-20180710+ #3
[   26.665692] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   26.675044] Call Trace:
[   26.677637]  dump_stack+0x1c9/0x2b4
[   26.681255]  ? dump_stack_print_info.cold.2+0x52/0x52
[   26.686437]  panic+0x238/0x4e7
[   26.689625]  ? add_taint.cold.5+0x16/0x16
[   26.693773]  ? __warn.cold.8+0x148/0x1ba
[   26.697837]  ? __warn.cold.8+0x117/0x1ba
[   26.701903]  ? kmalloc_slab+0x56/0x70
[   26.705686]  __warn.cold.8+0x163/0x1ba
[   26.709556]  ? kmalloc_slab+0x56/0x70
[   26.713341]  report_bug+0x252/0x2d0
[   26.716955]  do_error_trap+0x1fc/0x4d0
[   26.720833]  ? p9_client_xattrwalk+0xe0/0x6b0
[   26.725309]  ? math_error+0x3e0/0x3e0
[   26.729090]  ? p9_client_zc_rpc.constprop.11+0x1560/0x1560
[   26.734698]  ? save_stack+0xa9/0xd0
[   26.738309]  ? p9_client_clunk+0xde/0x180
[   26.742440]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   26.747279]  do_invalid_op+0x1b/0x20
[   26.750991]  invalid_op+0x14/0x20
[   26.754433] RIP: 0010:kmalloc_slab+0x56/0x70
[   26.758827] Code: c5 c0 0a d2 88 5d c3 b8 10 00 00 00 48 85 ff 74 f4 83 ef 01 c1 ef 03 0f b6 87 e0 09 d2 88 eb d8 31 c0 81 e6 00 02 00 00 75 db <0f> 0b 5d c3 48 8b 04 c5 00 0a d2 88 5d c3 66 90 66 2e 0f 1f 84 00 
[   26.778055] RSP: 0018:ffff8801ac9bfa30 EFLAGS: 00010246
[   26.783425] RAX: 0000000000000000 RBX: 0000000700000000 RCX: ffffffff82b10c44
[   26.790703] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000700000000
[   26.797986] RBP: ffff8801ac9bfa30 R08: ffff8801ace58100 R09: fffffbfff12569a8
[   26.805264] R10: fffffbfff12569a8 R11: ffffffff892b4d43 R12: fffffffffffffff4
[   26.812520] R13: ffff8801b30e5b80 R14: ffff8801b30e5b80 R15: 0000000000608040
[   26.819821]  ? __v9fs_get_acl+0x34/0x170
[   26.823882]  __kmalloc+0x25/0x760
[   26.827322]  ? trace_hardirqs_off+0xd/0x10
[   26.831546]  ? quarantine_put+0x10d/0x1b0
[   26.835677]  ? __v9fs_get_acl+0xc5/0x170
[   26.839731]  __v9fs_get_acl+0xc5/0x170
[   26.843600]  v9fs_get_acl+0xe5/0x2a0
[   26.847309]  v9fs_mount+0x64b/0x900
[   26.850921]  ? v9fs_drop_inode+0x150/0x150
[   26.855145]  legacy_get_tree+0x118/0x440
[   26.859202]  vfs_get_tree+0x1cb/0x5c0
[   26.862985]  do_mount+0x6c1/0x1fb0
[   26.866538]  ? check_same_owner+0x340/0x340
[   26.870864]  ? lock_release+0xa30/0xa30
[   26.874821]  ? copy_mount_string+0x40/0x40
[   26.879040]  ? kasan_kmalloc+0xc4/0xe0
[   26.882912]  ? kmem_cache_alloc_trace+0x318/0x780
[   26.887736]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   26.893261]  ? _copy_from_user+0xdf/0x150
[   26.897393]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   26.902950]  ? copy_mount_options+0x285/0x380
[   26.907449]  ksys_mount+0x12d/0x140
[   26.911069]  __x64_sys_mount+0xbe/0x150
[   26.915034]  do_syscall_64+0x1b9/0x820
[   26.918921]  ? syscall_slow_exit_work+0x500/0x500
[   26.923770]  ? syscall_return_slowpath+0x5e0/0x5e0
[   26.928689]  ? syscall_return_slowpath+0x31d/0x5e0
[   26.933610]  ? prepare_exit_to_usermode+0x291/0x3b0
[   26.938623]  ? perf_trace_sys_enter+0xb10/0xb10
[   26.943282]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   26.948128]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   26.953325] RIP: 0033:0x4404a9
[   26.956505] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 
[   26.975644] RSP: 002b:00007fffabc5f1b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
[   26.983350] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00000000004404a9
[   26.990614] RDX: 0000000020000900 RSI: 0000000020000000 RDI: 0000000000000000
[   26.997883] RBP: 64663d736e617274 R08: 0000000020000540 R09: 00007fffabc5f338
[   27.005152] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000401d30
[   27.012432] R13: 0000000000401dc0 R14: 0000000000000000 R15: 0000000000000000
[   27.020296] Dumping ftrace buffer:
[   27.023830]    (ftrace buffer empty)
[   27.027532] Kernel Offset: disabled
[   27.031161] Rebooting in 86400 seconds..