[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   16.371969] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   22.651208] random: sshd: uninitialized urandom read (32 bytes read)
[   22.973127] random: sshd: uninitialized urandom read (32 bytes read)
[   23.736370] random: sshd: uninitialized urandom read (32 bytes read)
[   23.871571] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts.
[   29.369237] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   29.449564] WARNING: CPU: 0 PID: 4468 at include/net/sock.h:660 smc_unhash_sk+0x357/0x4b0
[   29.457897] Kernel panic - not syncing: panic_on_warn set ...
[   29.457897] 
[   29.465247] CPU: 0 PID: 4468 Comm: syz-executor696 Not tainted 4.18.0-rc3+ #131
[   29.473016] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.482356] Call Trace:
[   29.484938]  dump_stack+0x1c9/0x2b4
[   29.488557]  ? dump_stack_print_info.cold.2+0x52/0x52
[   29.493727]  panic+0x238/0x4e7
[   29.496991]  ? add_taint.cold.5+0x16/0x16
[   29.501115]  ? __warn.cold.8+0x148/0x1ba
[   29.505154]  ? __warn.cold.8+0x117/0x1ba
[   29.509200]  ? smc_unhash_sk+0x357/0x4b0
[   29.513241]  __warn.cold.8+0x163/0x1ba
[   29.517191]  ? smc_unhash_sk+0x357/0x4b0
[   29.521232]  report_bug+0x252/0x2d0
[   29.524849]  do_error_trap+0x1fc/0x4d0
[   29.528713]  ? math_error+0x3e0/0x3e0
[   29.532506]  ? kasan_check_write+0x14/0x20
[   29.536731]  ? do_raw_spin_lock+0xc1/0x200
[   29.540948]  ? lock_acquire+0x1e4/0x540
[   29.544901]  ? smc_unhash_sk+0xd7/0x4b0
[   29.548857]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   29.553935]  do_invalid_op+0x1b/0x20
[   29.557631]  invalid_op+0x14/0x20
[   29.561062] RIP: 0010:smc_unhash_sk+0x357/0x4b0
[   29.565703] Code: 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 88 00 00 00 48 81 c4 c0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 f9 16 18 fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 d3 ef 55 fa 
[   29.584824] RSP: 0018:ffff8801ad60f480 EFLAGS: 00010293
[   29.590164] RAX: ffff8801ac9102c0 RBX: ffff8801ac42d140 RCX: ffffffff8763f416
[   29.597411] RDX: 0000000000000000 RSI: ffffffff8763f4d7 RDI: 0000000000000005
[   29.604657] RBP: ffff8801ad60f568 R08: ffff8801ac9102c0 R09: ffffed0035885a38
[   29.611903] R10: ffffed0035885a38 R11: ffff8801ac42d1c3 R12: 1ffff10035ac1e94
[   29.619163] R13: ffff8801ad60f540 R14: ffffffff89938700 R15: ffff8801ac42d1c0
[   29.626435]  ? smc_unhash_sk+0x296/0x4b0
[   29.630473]  ? smc_unhash_sk+0x357/0x4b0
[   29.634516]  ? smc_rx_data_available+0x120/0x120
[   29.639249]  ? release_sock+0x1ec/0x2c0
[   29.643206]  ? do_raw_write_trylock+0x1c0/0x1c0
[   29.648136]  ? __release_sock+0x3a0/0x3a0
[   29.652263]  ? smc_release+0x2cb/0x680
[   29.656141]  ? trace_hardirqs_on+0xd/0x10
[   29.660266]  ? __local_bh_enable_ip+0x161/0x230
[   29.664921]  smc_release+0x3d1/0x680
[   29.668623]  __sock_release+0xd7/0x260
[   29.672500]  ? __sock_release+0x260/0x260
[   29.676625]  sock_close+0x19/0x20
[   29.680065]  __fput+0x355/0x8b0
[   29.683335]  ? fput+0x1a0/0x1a0
[   29.686604]  ? kasan_check_write+0x14/0x20
[   29.690833]  ? do_raw_spin_lock+0xc1/0x200
[   29.695054]  ____fput+0x15/0x20
[   29.698328]  task_work_run+0x1ec/0x2a0
[   29.702195]  ? task_work_cancel+0x250/0x250
[   29.706500]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   29.712018]  ? switch_task_namespaces+0xa2/0xd0
[   29.716667]  do_exit+0x1b08/0x2750
[   29.720184]  ? do_raw_spin_trylock+0x1c0/0x1c0
[   29.724754]  ? mm_update_next_owner+0x9a0/0x9a0
[   29.729409]  ? release_sock+0x1ec/0x2c0
[   29.733361]  ? lock_downgrade+0x8f0/0x8f0
[   29.737486]  ? lock_downgrade+0x8f0/0x8f0
[   29.741614]  ? kasan_check_read+0x11/0x20
[   29.745740]  ? do_raw_spin_unlock+0xa7/0x2f0
[   29.750133]  ? release_sock+0x1ec/0x2c0
[   29.754094]  ? lock_downgrade+0x8f0/0x8f0
[   29.758220]  ? lock_downgrade+0x8f0/0x8f0
[   29.762353]  ? kasan_check_read+0x11/0x20
[   29.766569]  ? do_raw_spin_unlock+0xa7/0x2f0
[   29.770956]  ? do_raw_spin_trylock+0x1c0/0x1c0
[   29.775529]  ? release_sock+0x1ec/0x2c0
[   29.779483]  ? trace_hardirqs_on+0xd/0x10
[   29.783610]  ? __local_bh_enable_ip+0x161/0x230
[   29.788258]  ? _raw_spin_unlock_bh+0x30/0x40
[   29.792642]  ? release_sock+0x1ec/0x2c0
[   29.796590]  ? __release_sock+0x3a0/0x3a0
[   29.800727]  ? __local_bh_enable_ip+0x161/0x230
[   29.805394]  ? smc_sendmsg+0x2d5/0x370
[   29.809259]  ? smc_sendpage+0x1a0/0x1a0
[   29.813218]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   29.818734]  ? sock_sendmsg+0x5a/0x120
[   29.822598]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   29.828112]  ? __sys_sendto+0x475/0x670
[   29.832066]  ? __ia32_sys_getpeername+0xb0/0xb0
[   29.836715]  ? mem_cgroup_from_task+0xcb/0x1f0
[   29.841287]  ? __do_page_fault+0x664/0xe50
[   29.845901]  ? lock_downgrade+0x8f0/0x8f0
[   29.850038]  ? handle_mm_fault+0x55d/0xc80
[   29.854263]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   29.860002]  do_group_exit+0x177/0x440
[   29.863989]  ? mm_fault_error+0x380/0x380
[   29.868119]  ? __ia32_sys_exit+0x50/0x50
[   29.872180]  __x64_sys_exit_group+0x3e/0x50
[   29.876487]  do_syscall_64+0x1b9/0x820
[   29.880369]  ? syscall_return_slowpath+0x5e0/0x5e0
[   29.885291]  ? syscall_return_slowpath+0x31d/0x5e0
[   29.890211]  ? prepare_exit_to_usermode+0x3b0/0x3b0
[   29.895258]  ? prepare_exit_to_usermode+0x291/0x3b0
[   29.900279]  ? perf_trace_sys_enter+0xb10/0xb10
[   29.904929]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   29.910189]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   29.915368] RIP: 0033:0x43ecc8
[   29.918540] Code: Bad RIP value.
[   29.921894] RSP: 002b:00007ffe993ca018 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   29.929580] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ecc8
[   29.936826] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[   29.944082] RBP: 00000000004be588 R08: 00000000000000e7 R09: ffffffffffffffd0
[   29.951351] R10: 0000000020000010 R11: 0000000000000246 R12: 0000000000000001
[   29.958602] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000
[   29.966285] Dumping ftrace buffer:
[   29.969798]    (ftrace buffer empty)
[   29.973757] Kernel Offset: disabled
[   29.977369] Rebooting in 86400 seconds..