[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.440252] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.980752] random: sshd: uninitialized urandom read (32 bytes read) [ 23.331898] random: sshd: uninitialized urandom read (32 bytes read) [ 24.048891] random: sshd: uninitialized urandom read (32 bytes read) [ 24.205999] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. [ 29.648928] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.739509] WARNING: CPU: 1 PID: 4534 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.747888] Kernel panic - not syncing: panic_on_warn set ... [ 29.747888] [ 29.755235] CPU: 1 PID: 4534 Comm: syz-executor750 Not tainted 4.17.0-rc2+ #31 [ 29.762572] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.771908] Call Trace: [ 29.774478] dump_stack+0x1b9/0x294 [ 29.778091] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.783280] ? smc_unhash_sk+0x2f0/0x4a0 [ 29.787320] panic+0x22f/0x4de [ 29.790490] ? add_taint.cold.5+0x16/0x16 [ 29.794620] ? __warn.cold.8+0x148/0x1b3 [ 29.798660] ? __warn.cold.8+0x117/0x1b3 [ 29.802699] ? smc_unhash_sk+0x345/0x4a0 [ 29.806737] __warn.cold.8+0x163/0x1b3 [ 29.810605] ? smc_unhash_sk+0x345/0x4a0 [ 29.814658] report_bug+0x252/0x2d0 [ 29.818274] do_error_trap+0x1de/0x490 [ 29.822142] ? graph_lock+0x170/0x170 [ 29.825920] ? math_error+0x420/0x420 [ 29.829711] ? lock_acquire+0x1dc/0x520 [ 29.833665] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.838493] do_invalid_op+0x1b/0x20 [ 29.842199] invalid_op+0x14/0x20 [ 29.845630] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.850273] RSP: 0018:ffff8801b179f488 EFLAGS: 00010293 [ 29.855616] RAX: ffff8801d9646280 RBX: ffff8801d97c07c0 RCX: ffffffff873fce9e [ 29.862865] RDX: 0000000000000000 RSI: ffffffff873fcf55 RDI: 0000000000000005 [ 29.870113] RBP: ffff8801b179f570 R08: ffff8801d9646280 R09: ffffed003b2f8108 [ 29.877363] R10: ffffed003b2f8108 R11: ffff8801d97c0843 R12: 1ffff100362f3e95 [ 29.884624] R13: ffff8801b179f548 R14: ffffffff8970e060 R15: ffff8801d97c0840 [ 29.891885] ? smc_unhash_sk+0x28e/0x4a0 [ 29.895928] ? smc_unhash_sk+0x345/0x4a0 [ 29.899975] ? smc_unhash_sk+0x345/0x4a0 [ 29.904025] ? smc_hash_sk+0x2f0/0x2f0 [ 29.907914] ? release_sock+0x1e2/0x2b0 [ 29.911871] ? __local_bh_enable_ip+0x161/0x230 [ 29.916520] ? __release_sock+0x3a0/0x3a0 [ 29.920656] ? smc_release+0x269/0x610 [ 29.924524] ? trace_hardirqs_on+0xd/0x10 [ 29.928653] ? __local_bh_enable_ip+0x161/0x230 [ 29.933302] smc_release+0x36e/0x610 [ 29.936998] sock_release+0x96/0x1b0 [ 29.940701] ? sock_alloc_file+0x4e0/0x4e0 [ 29.944917] sock_close+0x16/0x20 [ 29.948359] __fput+0x34d/0x890 [ 29.951621] ? fput+0x1a0/0x1a0 [ 29.954878] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.959356] ____fput+0x15/0x20 [ 29.962621] task_work_run+0x1e4/0x290 [ 29.966487] ? task_work_cancel+0x240/0x240 [ 29.970799] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.976318] ? switch_task_namespaces+0xa2/0xd0 [ 29.980975] do_exit+0x1aee/0x2730 [ 29.984497] ? mm_update_next_owner+0x980/0x980 [ 29.989156] ? find_held_lock+0x36/0x1c0 [ 29.993199] ? lock_downgrade+0x8e0/0x8e0 [ 29.997323] ? lock_downgrade+0x8e0/0x8e0 [ 30.001462] ? kasan_check_read+0x11/0x20 [ 30.005590] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.009978] ? __local_bh_enable_ip+0x161/0x230 [ 30.014626] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.019621] ? release_sock+0x1e2/0x2b0 [ 30.023580] ? trace_hardirqs_on+0xd/0x10 [ 30.027715] ? __local_bh_enable_ip+0x161/0x230 [ 30.032365] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.036753] ? release_sock+0x1e2/0x2b0 [ 30.040706] ? __release_sock+0x3a0/0x3a0 [ 30.044836] ? __local_bh_enable_ip+0x161/0x230 [ 30.049485] ? lock_sock_nested+0xe7/0x120 [ 30.053701] ? smc_sendmsg+0x2d5/0x370 [ 30.057567] ? smc_recvmsg+0x300/0x300 [ 30.061435] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.066949] ? sock_sendmsg+0x5a/0x120 [ 30.070816] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.076331] ? __sys_sendto+0x475/0x670 [ 30.080936] ? __ia32_sys_getpeername+0xb0/0xb0 [ 30.085589] ? lock_downgrade+0x8e0/0x8e0 [ 30.089725] ? handle_mm_fault+0x8c0/0xc70 [ 30.093939] ? handle_mm_fault+0x55a/0xc70 [ 30.098162] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.103681] do_group_exit+0x16f/0x430 [ 30.107547] ? mm_fault_error+0x380/0x380 [ 30.111674] ? __ia32_sys_exit+0x50/0x50 [ 30.115717] ? do_syscall_64+0x92/0x800 [ 30.119672] __x64_sys_exit_group+0x3e/0x50 [ 30.123971] do_syscall_64+0x1b1/0x800 [ 30.127836] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 30.132657] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.137567] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.142480] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.147827] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.152651] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.157818] RIP: 0033:0x43e918 [ 30.160987] RSP: 002b:00007ffd6d6dd778 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.168682] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e918 [ 30.175930] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.183189] RBP: 00000000004be2c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.190437] R10: 0000000020000090 R11: 0000000000000246 R12: 0000000000000001 [ 30.197685] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.205484] Dumping ftrace buffer: [ 30.209262] (ftrace buffer empty) [ 30.212947] Kernel Offset: disabled [ 30.216555] Rebooting in 86400 seconds..