[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   19.773879] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   23.820519] random: sshd: uninitialized urandom read (32 bytes read)
[   24.209474] random: sshd: uninitialized urandom read (32 bytes read)
[   24.960546] random: sshd: uninitialized urandom read (32 bytes read)
[   25.116878] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts.
[   30.533137] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   30.632587] WARNING: CPU: 1 PID: 4542 at lib/iov_iter.c:857 iov_iter_revert+0x2ee/0xaa0
[   30.640860] Kernel panic - not syncing: panic_on_warn set ...
[   30.640860] 
[   30.648228] CPU: 1 PID: 4542 Comm: syz-executor650 Not tainted 4.17.0-rc4+ #44
[   30.655572] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.664910] Call Trace:
[   30.667482]  dump_stack+0x1b9/0x294
[   30.671097]  ? dump_stack_print_info.cold.2+0x52/0x52
[   30.676285]  ? iov_iter_revert+0x2a0/0xaa0
[   30.680510]  panic+0x22f/0x4de
[   30.683687]  ? add_taint.cold.5+0x16/0x16
[   30.687830]  ? __warn.cold.8+0x148/0x1b3
[   30.691873]  ? __warn.cold.8+0x117/0x1b3
[   30.695915]  ? iov_iter_revert+0x2ee/0xaa0
[   30.700135]  __warn.cold.8+0x163/0x1b3
[   30.704008]  ? iov_iter_revert+0x2ee/0xaa0
[   30.708236]  report_bug+0x252/0x2d0
[   30.711847]  do_error_trap+0x1de/0x490
[   30.715718]  ? math_error+0x420/0x420
[   30.719516]  ? sock_def_error_report+0x2f2/0x710
[   30.724255]  ? sock_def_readable+0x710/0x710
[   30.728649]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   30.733484]  do_invalid_op+0x1b/0x20
[   30.737188]  invalid_op+0x14/0x20
[   30.740631] RIP: 0010:iov_iter_revert+0x2ee/0xaa0
[   30.745450] RSP: 0018:ffff8801ad1bf700 EFLAGS: 00010293
[   30.750794] RAX: ffff8801ac55e6c0 RBX: 00000000ffffffff RCX: ffffffff835104a1
[   30.758060] RDX: 0000000000000000 RSI: ffffffff8351074e RDI: 0000000000000007
[   30.765319] RBP: ffff8801ad1bf760 R08: ffff8801ac55e6c0 R09: ffffed003b5e46c2
[   30.772572] R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000001
[   30.779821] R13: ffff8801ad1bfd60 R14: 0000000000000011 R15: ffff8801ae9ac040
[   30.787090]  ? iov_iter_revert+0x41/0xaa0
[   30.791220]  ? iov_iter_revert+0x2ee/0xaa0
[   30.795445]  tls_sw_sendmsg+0xf1c/0x12d0
[   30.799493]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   30.805029]  ? _copy_from_user+0xdf/0x150
[   30.809183]  ? tls_sw_push_pending_record+0x30/0x30
[   30.814186]  ? import_iovec+0x237/0x420
[   30.818145]  ? dup_iter+0x270/0x270
[   30.821756]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   30.827281]  inet_sendmsg+0x19f/0x690
[   30.831069]  ? copy_msghdr_from_user+0x3bc/0x560
[   30.835809]  ? ipip_gro_receive+0x100/0x100
[   30.840114]  ? move_addr_to_kernel.part.18+0x100/0x100
[   30.845378]  ? security_socket_sendmsg+0x94/0xc0
[   30.850119]  ? ipip_gro_receive+0x100/0x100
[   30.854425]  sock_sendmsg+0xd5/0x120
[   30.858125]  ___sys_sendmsg+0x805/0x940
[   30.862094]  ? lock_release+0xa10/0xa10
[   30.866056]  ? copy_msghdr_from_user+0x560/0x560
[   30.870883]  ? inet_sendmsg+0x1a7/0x690
[   30.874852]  ? __might_sleep+0x95/0x190
[   30.878817]  ? ipip_gro_receive+0x100/0x100
[   30.883130]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   30.888659]  ? __fget_light+0x2ef/0x430
[   30.892617]  ? fget_raw+0x20/0x20
[   30.896061]  ? __sys_sendto+0x475/0x670
[   30.900047]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   30.905574]  ? sockfd_lookup_light+0xc5/0x160
[   30.910055]  __sys_sendmsg+0x115/0x270
[   30.913934]  ? __ia32_sys_shutdown+0x80/0x80
[   30.918335]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   30.923860]  ? kernel_accept+0x310/0x310
[   30.927912]  ? syscall_slow_exit_work+0x4f0/0x4f0
[   30.932741]  __x64_sys_sendmsg+0x78/0xb0
[   30.936788]  do_syscall_64+0x1b1/0x800
[   30.940656]  ? syscall_slow_exit_work+0x4f0/0x4f0
[   30.945482]  ? syscall_return_slowpath+0x5c0/0x5c0
[   30.950393]  ? syscall_return_slowpath+0x30f/0x5c0
[   30.955318]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   30.960678]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   30.965507]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   30.970679] RIP: 0033:0x4403a9
[   30.973848] RSP: 002b:00007ffdcdfbd6c8 EFLAGS: 00000207 ORIG_RAX: 000000000000002e
[   30.981538] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004403a9
[   30.988787] RDX: 0000000000000000 RSI: 0000000020001340 RDI: 0000000000000003
[   30.996041] RBP: 00000000006ca018 R08: 000000000000001c R09: 000000000000001c
[   31.003311] R10: 0000000020000180 R11: 0000000000000207 R12: 0000000000401cd0
[   31.010564] R13: 0000000000401d60 R14: 0000000000000000 R15: 0000000000000000
[   31.018509] Dumping ftrace buffer:
[   31.022152]    (ftrace buffer empty)
[   31.025843] Kernel Offset: disabled
[   31.029453] Rebooting in 86400 seconds..