[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   20.118915] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   24.499163] random: sshd: uninitialized urandom read (32 bytes read)
[   24.777161] random: sshd: uninitialized urandom read (32 bytes read)
[   25.533232] random: sshd: uninitialized urandom read (32 bytes read)
[   42.072323] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.36' (ECDSA) to the list of known hosts.
[   47.648964] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   47.744053] WARNING: CPU: 1 PID: 4499 at lib/iov_iter.c:857 iov_iter_revert+0x2ee/0xaa0
[   47.752259] Kernel panic - not syncing: panic_on_warn set ...
[   47.752259] 
[   47.759603] CPU: 1 PID: 4499 Comm: syz-executor095 Not tainted 4.17.0-rc4+ #41
[   47.766942] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.776270] Call Trace:
[   47.778842]  dump_stack+0x1b9/0x294
[   47.782449]  ? dump_stack_print_info.cold.2+0x52/0x52
[   47.787619]  ? iov_iter_revert+0x220/0xaa0
[   47.791832]  panic+0x22f/0x4de
[   47.795002]  ? add_taint.cold.5+0x16/0x16
[   47.799127]  ? __warn.cold.8+0x148/0x1b3
[   47.803164]  ? __warn.cold.8+0x117/0x1b3
[   47.807202]  ? iov_iter_revert+0x2ee/0xaa0
[   47.811412]  __warn.cold.8+0x163/0x1b3
[   47.815278]  ? iov_iter_revert+0x2ee/0xaa0
[   47.819491]  report_bug+0x252/0x2d0
[   47.823103]  do_error_trap+0x1de/0x490
[   47.826970]  ? math_error+0x420/0x420
[   47.830751]  ? sock_def_error_report+0x2f2/0x710
[   47.835486]  ? sock_def_readable+0x710/0x710
[   47.839872]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   47.844691]  do_invalid_op+0x1b/0x20
[   47.848414]  invalid_op+0x14/0x20
[   47.851857] RIP: 0010:iov_iter_revert+0x2ee/0xaa0
[   47.857293] RSP: 0018:ffff8801a97f7700 EFLAGS: 00010293
[   47.862643] RAX: ffff8801ad718600 RBX: 00000000ffffffff RCX: ffffffff8350ee21
[   47.869892] RDX: 0000000000000000 RSI: ffffffff8350f0ce RDI: 0000000000000007
[   47.877146] RBP: ffff8801a97f7760 R08: ffff8801ad718600 R09: ffffed003b5e46c2
[   47.884405] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000001
[   47.891654] R13: ffff8801a97f7d60 R14: 0000000000000011 R15: ffff8801aff22040
[   47.898922]  ? iov_iter_revert+0x41/0xaa0
[   47.903060]  ? iov_iter_revert+0x2ee/0xaa0
[   47.907284]  tls_sw_sendmsg+0xefc/0x12b0
[   47.911332]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   47.916851]  ? _copy_from_user+0xdf/0x150
[   47.920997]  ? tls_sw_push_pending_record+0x30/0x30
[   47.926009]  ? import_iovec+0x1b7/0x420
[   47.929980]  ? dup_iter+0x270/0x270
[   47.933609]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   47.939145]  inet_sendmsg+0x19f/0x690
[   47.942944]  ? copy_msghdr_from_user+0x3bc/0x560
[   47.947699]  ? ipip_gro_receive+0x100/0x100
[   47.952017]  ? move_addr_to_kernel.part.18+0x100/0x100
[   47.957304]  ? security_socket_sendmsg+0x94/0xc0
[   47.962062]  ? ipip_gro_receive+0x100/0x100
[   47.966379]  sock_sendmsg+0xd5/0x120
[   47.970088]  ___sys_sendmsg+0x805/0x940
[   47.974057]  ? lock_release+0xa10/0xa10
[   47.978024]  ? copy_msghdr_from_user+0x560/0x560
[   47.982776]  ? inet_sendmsg+0x1a7/0x690
[   47.986762]  ? __might_sleep+0x95/0x190
[   47.990729]  ? ipip_gro_receive+0x100/0x100
[   47.995045]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   48.000577]  ? __fget_light+0x2ef/0x430
[   48.004545]  ? fget_raw+0x20/0x20
[   48.007989]  ? __sys_sendto+0x475/0x670
[   48.011965]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   48.017497]  ? sockfd_lookup_light+0xc5/0x160
[   48.021987]  __sys_sendmsg+0x115/0x270
[   48.025872]  ? __ia32_sys_shutdown+0x80/0x80
[   48.030274]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   48.035809]  ? kernel_accept+0x310/0x310
[   48.039868]  ? syscall_slow_exit_work+0x4f0/0x4f0
[   48.044705]  __x64_sys_sendmsg+0x78/0xb0
[   48.048758]  do_syscall_64+0x1b1/0x800
[   48.052641]  ? syscall_return_slowpath+0x5c0/0x5c0
[   48.057563]  ? syscall_return_slowpath+0x30f/0x5c0
[   48.062507]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   48.067868]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   48.072706]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   48.077884] RIP: 0033:0x4403a9
[   48.081060] RSP: 002b:00007fffe6a8a078 EFLAGS: 00000207 ORIG_RAX: 000000000000002e
[   48.088758] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004403a9
[   48.096019] RDX: 0000000000000000 RSI: 0000000020001340 RDI: 0000000000000003
[   48.103290] RBP: 00000000006ca018 R08: 000000000000001c R09: 000000000000001c
[   48.110559] R10: 0000000020000180 R11: 0000000000000207 R12: 0000000000401cd0
[   48.117818] R13: 0000000000401d60 R14: 0000000000000000 R15: 0000000000000000
[   48.125714] Dumping ftrace buffer:
[   48.129507]    (ftrace buffer empty)
[   48.133222] Kernel Offset: disabled
[   48.136849] Rebooting in 86400 seconds..