[....] Starting OpenBSD Secure Shell server: sshd[ 19.003657] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.870218] random: sshd: uninitialized urandom read (32 bytes read) [ 25.074918] sshd (4469) used greatest stack depth: 16648 bytes left [ 25.096366] random: sshd: uninitialized urandom read (32 bytes read) [ 25.837384] random: sshd: uninitialized urandom read (32 bytes read) [ 25.997918] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 31.481162] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.574244] WARNING: CPU: 1 PID: 4485 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.582645] Kernel panic - not syncing: panic_on_warn set ... [ 31.582645] [ 31.589997] CPU: 1 PID: 4485 Comm: syz-executor669 Not tainted 4.17.0-rc3+ #34 [ 31.597357] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.606696] Call Trace: [ 31.609271] dump_stack+0x1b9/0x294 [ 31.612882] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.618066] ? smc_unhash_sk+0x310/0x4a0 [ 31.622130] panic+0x22f/0x4de [ 31.625308] ? add_taint.cold.5+0x16/0x16 [ 31.629450] ? __warn.cold.8+0x148/0x1b3 [ 31.633501] ? __warn.cold.8+0x117/0x1b3 [ 31.637558] ? smc_unhash_sk+0x345/0x4a0 [ 31.641605] __warn.cold.8+0x163/0x1b3 [ 31.645476] ? smc_unhash_sk+0x345/0x4a0 [ 31.649542] report_bug+0x252/0x2d0 [ 31.653152] do_error_trap+0x1de/0x490 [ 31.657020] ? graph_lock+0x170/0x170 [ 31.660812] ? math_error+0x420/0x420 [ 31.664599] ? lock_acquire+0x1dc/0x520 [ 31.668571] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.673412] do_invalid_op+0x1b/0x20 [ 31.677115] invalid_op+0x14/0x20 [ 31.680554] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.685208] RSP: 0018:ffff8801ad26f488 EFLAGS: 00010293 [ 31.690555] RAX: ffff8801cec78680 RBX: ffff8801ad4e77c0 RCX: ffffffff87402b7e [ 31.697810] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005 [ 31.705074] RBP: ffff8801ad26f570 R08: ffff8801cec78680 R09: ffffed0035a9cf08 [ 31.712333] R10: ffffed0035a9cf08 R11: ffff8801ad4e7843 R12: 1ffff10035a4de95 [ 31.719603] R13: ffff8801ad26f548 R14: ffffffff8970e8a0 R15: ffff8801ad4e7840 [ 31.726897] ? smc_unhash_sk+0x28e/0x4a0 [ 31.730960] ? smc_unhash_sk+0x345/0x4a0 [ 31.735018] ? smc_unhash_sk+0x345/0x4a0 [ 31.739092] ? smc_rx_data_available+0x100/0x100 [ 31.743846] ? release_sock+0x1e2/0x2b0 [ 31.747802] ? __local_bh_enable_ip+0x161/0x230 [ 31.752468] ? __release_sock+0x3a0/0x3a0 [ 31.756614] ? smc_release+0x269/0x610 [ 31.760487] ? trace_hardirqs_on+0xd/0x10 [ 31.764627] ? __local_bh_enable_ip+0x161/0x230 [ 31.769282] smc_release+0x36e/0x610 [ 31.772981] sock_release+0x96/0x1b0 [ 31.776678] ? sock_alloc_file+0x4e0/0x4e0 [ 31.780894] sock_close+0x16/0x20 [ 31.784330] __fput+0x34d/0x890 [ 31.787594] ? fput+0x1a0/0x1a0 [ 31.790855] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.795341] ____fput+0x15/0x20 [ 31.798608] task_work_run+0x1e4/0x290 [ 31.802485] ? task_work_cancel+0x240/0x240 [ 31.806795] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.812318] ? switch_task_namespaces+0xa2/0xd0 [ 31.816975] do_exit+0x1aee/0x2730 [ 31.820506] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.824912] ? mm_update_next_owner+0x980/0x980 [ 31.829568] ? ___sys_sendmsg+0x31a/0x940 [ 31.833701] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.838699] ? kfree+0x1e9/0x260 [ 31.842060] ? ___sys_sendmsg+0x31f/0x940 [ 31.846202] ? copy_msghdr_from_user+0x560/0x560 [ 31.850940] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.855941] ? graph_lock+0x170/0x170 [ 31.859728] ? pud_val+0x80/0xf0 [ 31.863099] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.868622] ? __fget_light+0x2ef/0x430 [ 31.872578] ? __handle_mm_fault+0x93a/0x4310 [ 31.877059] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 31.881797] ? graph_lock+0x170/0x170 [ 31.885604] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.891137] ? sockfd_lookup_light+0xc5/0x160 [ 31.895618] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.901141] ? __sys_sendmmsg+0x4b3/0x6f0 [ 31.905276] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 31.909583] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.915213] ? __handle_mm_fault+0x4310/0x4310 [ 31.919782] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.925300] ? __do_page_fault+0x441/0xe40 [ 31.929524] do_group_exit+0x16f/0x430 [ 31.933392] ? mm_fault_error+0x380/0x380 [ 31.937522] ? __ia32_sys_exit+0x50/0x50 [ 31.941569] ? do_syscall_64+0x92/0x800 [ 31.945529] __x64_sys_exit_group+0x3e/0x50 [ 31.949833] do_syscall_64+0x1b1/0x800 [ 31.953715] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.958625] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.963540] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.968888] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.973716] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.978886] RIP: 0033:0x43ee28 [ 31.982055] RSP: 002b:00007ffe7c4e1738 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.989747] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee28 [ 31.996998] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.004249] RBP: 00000000004be880 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.011499] R10: 0000000020004045 R11: 0000000000000246 R12: 0000000000000001 [ 32.018756] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.026750] Dumping ftrace buffer: [ 32.030375] (ftrace buffer empty) [ 32.034065] Kernel Offset: disabled [ 32.037676] Rebooting in 86400 seconds..