[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   28.132759] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   31.874362] random: sshd: uninitialized urandom read (32 bytes read)
[   32.195727] random: sshd: uninitialized urandom read (32 bytes read)
[   33.359546] random: sshd: uninitialized urandom read (32 bytes read)
[   33.599843] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts.
[   39.116713] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   39.224429] WARNING: CPU: 1 PID: 4470 at lib/iov_iter.c:863 iov_iter_revert+0x63b/0x1230
[   39.232685] Kernel panic - not syncing: panic_on_warn set ...
[   39.232685] 
[   39.240052] CPU: 1 PID: 4470 Comm: syz-executor147 Not tainted 4.17.0+ #5
[   39.246967] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.256311] Call Trace:
[   39.258907]  dump_stack+0x185/0x1d0
[   39.262545]  panic+0x3d0/0x990
[   39.265746]  ? disable_trace_on_warning+0x18/0xd0
[   39.270587]  __warn+0x40f/0x580
[   39.273860]  ? iov_iter_revert+0x63b/0x1230
[   39.278187]  report_bug+0x72a/0x880
[   39.281822]  ? iov_iter_revert+0x63b/0x1230
[   39.286147]  ? iov_iter_revert+0x63b/0x1230
[   39.290475]  do_error_trap+0x1c1/0x620
[   39.294388]  ? __msan_metadata_ptr_for_store_1+0x13/0x20
[   39.299847]  ? kmsan_set_origin_inline+0x6b/0x120
[   39.304710]  do_invalid_op+0x46/0x50
[   39.308433]  invalid_op+0x14/0x20
[   39.311883] RIP: 0010:iov_iter_revert+0x63b/0x1230
[   39.316799] RSP: 0018:ffff88019756f810 EFLAGS: 00010293
[   39.322168] RAX: ffffffff83fcdc0b RBX: 00000000fffffeee RCX: ffff8801cdec0000
[   39.329435] RDX: 0000000000000000 RSI: 00000000fffffeee RDI: ffff88019756fbe0
[   39.336693] RBP: ffff88019756f8f8 R08: 0000000000000095 R09: 0000000000000002
[   39.343958] R10: 0000000000000000 R11: ffffffff87d630f0 R12: 0000000000000000
[   39.351233] R13: ffff8801cdec08d8 R14: ffff8801cdec08d8 R15: 0000000000000000
[   39.358515]  ? sock_def_write_space+0x370/0x370
[   39.363190]  ? iov_iter_revert+0x63b/0x1230
[   39.367524]  tls_sw_sendmsg+0xe85/0x20e0
[   39.371608]  ? __atime_needs_update+0x949/0xfa0
[   39.376315]  ? tls_write_space+0x460/0x460
[   39.380554]  inet_sendmsg+0x3fc/0x760
[   39.384370]  ? __msan_metadata_ptr_for_load_8+0x10/0x20
[   39.389744]  ? inet_getname+0x4a0/0x4a0
[   39.393723]  sock_write_iter+0x3bc/0x470
[   39.397792]  ? sock_read_iter+0x480/0x480
[   39.401932]  __vfs_write+0x808/0x9f0
[   39.405653]  vfs_write+0x467/0x8c0
[   39.409207]  __x64_sys_write+0x1bf/0x3e0
[   39.413263]  ? ksys_write+0x360/0x360
[   39.417061]  do_syscall_64+0x15b/0x230
[   39.420945]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   39.426131] RIP: 0033:0x440a69
[   39.429320] RSP: 002b:00007ffc08defcd8 EFLAGS: 00000207 ORIG_RAX: 0000000000000001
[   39.437042] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440a69
[   39.444308] RDX: 0000000000000478 RSI: 0000000020000740 RDI: 0000000000000003
[   39.451570] RBP: 00000000006cb018 R08: 65732f636f72702f R09: 65732f636f72702f
[   39.458829] R10: 000000000000000f R11: 0000000000000207 R12: 00000000004022f0
[   39.466089] R13: 0000000000402380 R14: 0000000000000000 R15: 0000000000000000
[   39.473764] Dumping ftrace buffer:
[   39.477289]    (ftrace buffer empty)
[   39.480981] Kernel Offset: disabled
[   39.484600] Rebooting in 86400 seconds..