[....] Starting OpenBSD Secure Shell server: sshd[ 20.067707] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.973608] random: sshd: uninitialized urandom read (32 bytes read) [ 25.465560] random: sshd: uninitialized urandom read (32 bytes read) [ 26.203740] sshd (4477) used greatest stack depth: 16584 bytes left [ 26.224252] random: sshd: uninitialized urandom read (32 bytes read) [ 26.384638] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 31.836976] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.928697] WARNING: CPU: 0 PID: 4491 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.937091] Kernel panic - not syncing: panic_on_warn set ... [ 31.937091] [ 31.944435] CPU: 0 PID: 4491 Comm: syz-executor694 Not tainted 4.17.0-rc4+ #45 [ 31.951773] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.961105] Call Trace: [ 31.963683] dump_stack+0x1b9/0x294 [ 31.967293] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.972472] ? smc_unhash_sk+0x330/0x4a0 [ 31.976514] panic+0x22f/0x4de [ 31.979688] ? add_taint.cold.5+0x16/0x16 [ 31.983818] ? __warn.cold.8+0x148/0x1b3 [ 31.987859] ? __warn.cold.8+0x117/0x1b3 [ 31.991907] ? smc_unhash_sk+0x345/0x4a0 [ 31.995948] __warn.cold.8+0x163/0x1b3 [ 31.999823] ? smc_unhash_sk+0x345/0x4a0 [ 32.003866] report_bug+0x252/0x2d0 [ 32.007476] do_error_trap+0x1de/0x490 [ 32.011355] ? graph_lock+0x170/0x170 [ 32.015138] ? math_error+0x420/0x420 [ 32.018924] ? lock_acquire+0x1dc/0x520 [ 32.022886] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.027714] do_invalid_op+0x1b/0x20 [ 32.031412] invalid_op+0x14/0x20 [ 32.034851] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.039498] RSP: 0018:ffff8801ace27488 EFLAGS: 00010293 [ 32.044845] RAX: ffff8801d96ec280 RBX: ffff8801ad3977c0 RCX: ffffffff8740565e [ 32.052100] RDX: 0000000000000000 RSI: ffffffff87405715 RDI: 0000000000000005 [ 32.059355] RBP: ffff8801ace27570 R08: ffff8801d96ec280 R09: ffffed0035a72f08 [ 32.066611] R10: ffffed0035a72f08 R11: ffff8801ad397843 R12: 1ffff100359c4e95 [ 32.073867] R13: ffff8801ace27548 R14: ffffffff8970cba0 R15: ffff8801ad397840 [ 32.081133] ? smc_unhash_sk+0x28e/0x4a0 [ 32.085177] ? smc_unhash_sk+0x345/0x4a0 [ 32.089219] ? smc_unhash_sk+0x345/0x4a0 [ 32.093262] ? smc_rx_data_available+0x100/0x100 [ 32.098001] ? release_sock+0x1e2/0x2b0 [ 32.101960] ? __local_bh_enable_ip+0x161/0x230 [ 32.106619] ? __release_sock+0x3a0/0x3a0 [ 32.110748] ? smc_release+0x269/0x610 [ 32.114617] ? trace_hardirqs_on+0xd/0x10 [ 32.118758] ? __local_bh_enable_ip+0x161/0x230 [ 32.123410] smc_release+0x36e/0x610 [ 32.127120] sock_release+0x96/0x1b0 [ 32.130815] ? sock_alloc_file+0x4e0/0x4e0 [ 32.135037] sock_close+0x16/0x20 [ 32.138481] __fput+0x34d/0x890 [ 32.141747] ? fput+0x1a0/0x1a0 [ 32.145011] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.149494] ____fput+0x15/0x20 [ 32.152757] task_work_run+0x1e4/0x290 [ 32.156626] ? task_work_cancel+0x240/0x240 [ 32.160936] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.166456] ? switch_task_namespaces+0xa2/0xd0 [ 32.171110] do_exit+0x1aee/0x2730 [ 32.174633] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.179028] ? mm_update_next_owner+0x980/0x980 [ 32.183687] ? ___sys_sendmsg+0x31a/0x940 [ 32.187819] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.192820] ? kfree+0x1e9/0x260 [ 32.196168] ? ___sys_sendmsg+0x31f/0x940 [ 32.200299] ? copy_msghdr_from_user+0x560/0x560 [ 32.205040] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.210040] ? graph_lock+0x170/0x170 [ 32.213822] ? pud_val+0x80/0xf0 [ 32.217176] ? __handle_mm_fault+0x93a/0x4310 [ 32.221687] ? fget_raw+0x20/0x20 [ 32.225124] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 32.229860] ? graph_lock+0x170/0x170 [ 32.233652] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.239180] ? sockfd_lookup_light+0xc5/0x160 [ 32.243668] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.249186] ? __sys_sendmmsg+0x4b3/0x6f0 [ 32.253319] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 32.257630] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.263156] ? __handle_mm_fault+0x4310/0x4310 [ 32.267730] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.273249] ? __do_page_fault+0x441/0xe40 [ 32.277472] do_group_exit+0x16f/0x430 [ 32.281345] ? mm_fault_error+0x380/0x380 [ 32.285476] ? __ia32_sys_exit+0x50/0x50 [ 32.289525] ? do_syscall_64+0x92/0x800 [ 32.293486] __x64_sys_exit_group+0x3e/0x50 [ 32.297791] do_syscall_64+0x1b1/0x800 [ 32.301665] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.306580] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.311500] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.316850] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.321681] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.326854] RIP: 0033:0x43ed18 [ 32.330025] RSP: 002b:00007fff5b871ab8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.337715] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed18 [ 32.344967] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.352220] RBP: 00000000004be6c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.359474] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 32.366735] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.374618] Dumping ftrace buffer: [ 32.378270] (ftrace buffer empty) [ 32.381960] Kernel Offset: disabled [ 32.385573] Rebooting in 86400 seconds..