[....] Starting OpenBSD Secure Shell server: sshd[ 19.599289] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.657828] random: sshd: uninitialized urandom read (32 bytes read) [ 21.891836] sshd (4475) used greatest stack depth: 17144 bytes left [ 21.913132] random: sshd: uninitialized urandom read (32 bytes read) [ 22.644562] random: sshd: uninitialized urandom read (32 bytes read) [ 37.083051] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. [ 42.532500] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 42.625035] WARNING: CPU: 0 PID: 4494 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 42.633437] Kernel panic - not syncing: panic_on_warn set ... [ 42.633437] [ 42.640785] CPU: 0 PID: 4494 Comm: syz-executor925 Not tainted 4.17.0-rc3+ #33 [ 42.648122] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.657462] Call Trace: [ 42.660036] dump_stack+0x1b9/0x294 [ 42.663644] ? dump_stack_print_info.cold.2+0x52/0x52 [ 42.668815] ? smc_unhash_sk+0x270/0x4a0 [ 42.672856] panic+0x22f/0x4de [ 42.676035] ? add_taint.cold.5+0x16/0x16 [ 42.680163] ? __warn.cold.8+0x148/0x1b3 [ 42.684200] ? __warn.cold.8+0x117/0x1b3 [ 42.688243] ? smc_unhash_sk+0x345/0x4a0 [ 42.692283] __warn.cold.8+0x163/0x1b3 [ 42.696147] ? smc_unhash_sk+0x345/0x4a0 [ 42.700185] report_bug+0x252/0x2d0 [ 42.703802] do_error_trap+0x1de/0x490 [ 42.707669] ? graph_lock+0x170/0x170 [ 42.711457] ? math_error+0x420/0x420 [ 42.715241] ? lock_acquire+0x1dc/0x520 [ 42.719196] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.724017] do_invalid_op+0x1b/0x20 [ 42.727712] invalid_op+0x14/0x20 [ 42.731147] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 42.735802] RSP: 0018:ffff8801b0767488 EFLAGS: 00010293 [ 42.741145] RAX: ffff8801afc8a740 RBX: ffff8801b073e7c0 RCX: ffffffff873fe71e [ 42.748391] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 42.755646] RBP: ffff8801b0767570 R08: ffff8801afc8a740 R09: ffffed00360e7d08 [ 42.762892] R10: ffffed00360e7d08 R11: ffff8801b073e843 R12: 1ffff100360ece95 [ 42.770142] R13: ffff8801b0767548 R14: ffffffff8970e4e0 R15: ffff8801b073e840 [ 42.777407] ? smc_unhash_sk+0x28e/0x4a0 [ 42.781445] ? smc_unhash_sk+0x345/0x4a0 [ 42.785485] ? smc_unhash_sk+0x345/0x4a0 [ 42.789526] ? smc_rx_data_available+0x100/0x100 [ 42.794262] ? release_sock+0x1e2/0x2b0 [ 42.798235] ? __local_bh_enable_ip+0x161/0x230 [ 42.802891] ? __release_sock+0x3a0/0x3a0 [ 42.807024] ? smc_release+0x269/0x610 [ 42.810904] ? trace_hardirqs_on+0xd/0x10 [ 42.815044] ? __local_bh_enable_ip+0x161/0x230 [ 42.819701] smc_release+0x36e/0x610 [ 42.823402] sock_release+0x96/0x1b0 [ 42.827093] ? sock_alloc_file+0x4e0/0x4e0 [ 42.831305] sock_close+0x16/0x20 [ 42.834742] __fput+0x34d/0x890 [ 42.838004] ? fput+0x1a0/0x1a0 [ 42.841268] ? _raw_spin_unlock_irq+0x27/0x70 [ 42.845743] ____fput+0x15/0x20 [ 42.849002] task_work_run+0x1e4/0x290 [ 42.852871] ? task_work_cancel+0x240/0x240 [ 42.857175] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 42.862700] ? switch_task_namespaces+0xa2/0xd0 [ 42.867354] do_exit+0x1aee/0x2730 [ 42.870873] ? _raw_spin_unlock_bh+0x30/0x40 [ 42.875266] ? mm_update_next_owner+0x980/0x980 [ 42.879916] ? ___sys_sendmsg+0x31a/0x940 [ 42.884042] ? rcu_read_lock_sched_held+0x108/0x120 [ 42.889038] ? kfree+0x1e9/0x260 [ 42.892383] ? ___sys_sendmsg+0x31f/0x940 [ 42.896510] ? copy_msghdr_from_user+0x560/0x560 [ 42.901242] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 42.906243] ? graph_lock+0x170/0x170 [ 42.910025] ? pud_val+0x80/0xf0 [ 42.913378] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.918908] ? __fget_light+0x2ef/0x430 [ 42.922867] ? __handle_mm_fault+0x93a/0x4310 [ 42.927352] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 42.932102] ? graph_lock+0x170/0x170 [ 42.935927] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.941467] ? sockfd_lookup_light+0xc5/0x160 [ 42.945954] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.951473] ? __sys_sendmmsg+0x4b3/0x6f0 [ 42.955606] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 42.959909] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 42.965482] ? __handle_mm_fault+0x4310/0x4310 [ 42.970051] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.975569] ? __do_page_fault+0x441/0xe40 [ 42.979790] do_group_exit+0x16f/0x430 [ 42.983656] ? mm_fault_error+0x380/0x380 [ 42.987783] ? __ia32_sys_exit+0x50/0x50 [ 42.991826] ? do_syscall_64+0x92/0x800 [ 42.995781] __x64_sys_exit_group+0x3e/0x50 [ 43.000080] do_syscall_64+0x1b1/0x800 [ 43.003945] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 43.008771] ? syscall_return_slowpath+0x5c0/0x5c0 [ 43.013680] ? syscall_return_slowpath+0x30f/0x5c0 [ 43.018596] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 43.023953] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.028779] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.033949] RIP: 0033:0x43f298 [ 43.037130] RSP: 002b:00007ffd81cb13c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 43.044818] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f298 [ 43.052066] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 43.059325] RBP: 00000000004bed00 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 43.066591] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 43.073849] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 43.081696] Dumping ftrace buffer: [ 43.085326] (ftrace buffer empty) [ 43.089027] Kernel Offset: disabled [ 43.092638] Rebooting in 86400 seconds..