[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.502897] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 19.724926] random: sshd: uninitialized urandom read (32 bytes read) [ 20.208241] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.951866] random: sshd: uninitialized urandom read (32 bytes read) [ 21.108826] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. [ 26.606978] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.698666] WARNING: CPU: 0 PID: 4524 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 26.707057] Kernel panic - not syncing: panic_on_warn set ... [ 26.707057] [ 26.714405] CPU: 0 PID: 4524 Comm: syz-executor302 Not tainted 4.17.0-rc3+ #33 [ 26.721739] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.731079] Call Trace: [ 26.733648] dump_stack+0x1b9/0x294 [ 26.737257] ? dump_stack_print_info.cold.2+0x52/0x52 [ 26.742441] ? smc_unhash_sk+0x270/0x4a0 [ 26.746488] panic+0x22f/0x4de [ 26.749660] ? add_taint.cold.5+0x16/0x16 [ 26.753790] ? __warn.cold.8+0x148/0x1b3 [ 26.757829] ? __warn.cold.8+0x117/0x1b3 [ 26.761870] ? smc_unhash_sk+0x345/0x4a0 [ 26.765909] __warn.cold.8+0x163/0x1b3 [ 26.769776] ? smc_unhash_sk+0x345/0x4a0 [ 26.773817] report_bug+0x252/0x2d0 [ 26.777424] do_error_trap+0x1de/0x490 [ 26.781295] ? graph_lock+0x170/0x170 [ 26.785075] ? math_error+0x420/0x420 [ 26.788859] ? lock_acquire+0x1dc/0x520 [ 26.792814] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.797638] do_invalid_op+0x1b/0x20 [ 26.801331] invalid_op+0x14/0x20 [ 26.804763] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 26.809406] RSP: 0018:ffff8801adf9f488 EFLAGS: 00010293 [ 26.814749] RAX: ffff8801d92041c0 RBX: ffff8801ac3cb7c0 RCX: ffffffff873fe71e [ 26.821996] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 26.829251] RBP: ffff8801adf9f570 R08: ffff8801d92041c0 R09: ffffed0035879708 [ 26.836500] R10: ffffed0035879708 R11: ffff8801ac3cb843 R12: 1ffff10035bf3e95 [ 26.843751] R13: ffff8801adf9f548 R14: ffffffff8970e4e0 R15: ffff8801ac3cb840 [ 26.851014] ? smc_unhash_sk+0x28e/0x4a0 [ 26.855061] ? smc_unhash_sk+0x345/0x4a0 [ 26.859105] ? smc_unhash_sk+0x345/0x4a0 [ 26.863149] ? smc_rx_data_available+0x100/0x100 [ 26.867887] ? release_sock+0x1e2/0x2b0 [ 26.871843] ? __local_bh_enable_ip+0x161/0x230 [ 26.876494] ? __release_sock+0x3a0/0x3a0 [ 26.880624] ? smc_release+0x269/0x610 [ 26.884491] ? trace_hardirqs_on+0xd/0x10 [ 26.888620] ? __local_bh_enable_ip+0x161/0x230 [ 26.893270] smc_release+0x36e/0x610 [ 26.896969] sock_release+0x96/0x1b0 [ 26.900662] ? sock_alloc_file+0x4e0/0x4e0 [ 26.904877] sock_close+0x16/0x20 [ 26.908317] __fput+0x34d/0x890 [ 26.911579] ? fput+0x1a0/0x1a0 [ 26.914840] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.919324] ____fput+0x15/0x20 [ 26.922584] task_work_run+0x1e4/0x290 [ 26.926452] ? task_work_cancel+0x240/0x240 [ 26.930759] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 26.936278] ? switch_task_namespaces+0xa2/0xd0 [ 26.940929] do_exit+0x1aee/0x2730 [ 26.944453] ? mm_update_next_owner+0x980/0x980 [ 26.949121] ? find_held_lock+0x36/0x1c0 [ 26.953171] ? lock_downgrade+0x8e0/0x8e0 [ 26.957297] ? lock_downgrade+0x8e0/0x8e0 [ 26.961429] ? kasan_check_read+0x11/0x20 [ 26.965569] ? do_raw_spin_unlock+0x9e/0x2e0 [ 26.969972] ? __local_bh_enable_ip+0x161/0x230 [ 26.974624] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.979621] ? release_sock+0x1e2/0x2b0 [ 26.984025] ? trace_hardirqs_on+0xd/0x10 [ 26.988171] ? __local_bh_enable_ip+0x161/0x230 [ 26.992836] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.997226] ? release_sock+0x1e2/0x2b0 [ 27.001180] ? __release_sock+0x3a0/0x3a0 [ 27.005311] ? __local_bh_enable_ip+0x161/0x230 [ 27.009959] ? lock_sock_nested+0xe7/0x120 [ 27.014176] ? smc_sendmsg+0x2d5/0x370 [ 27.018043] ? smc_sendpage+0x1a0/0x1a0 [ 27.022001] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.027526] ? sock_sendmsg+0x5a/0x120 [ 27.031398] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.036916] ? __sys_sendto+0x475/0x670 [ 27.040871] ? __ia32_sys_getpeername+0xb0/0xb0 [ 27.045523] ? lock_downgrade+0x8e0/0x8e0 [ 27.049653] ? handle_mm_fault+0x8c0/0xc70 [ 27.053869] ? handle_mm_fault+0x55a/0xc70 [ 27.058095] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.063624] do_group_exit+0x16f/0x430 [ 27.067494] ? __ia32_sys_exit+0x50/0x50 [ 27.071544] ? do_syscall_64+0x92/0x800 [ 27.075505] __x64_sys_exit_group+0x3e/0x50 [ 27.079805] do_syscall_64+0x1b1/0x800 [ 27.083674] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.088584] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.093504] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 27.098849] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.103674] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.108843] RIP: 0033:0x43e958 [ 27.112020] RSP: 002b:00007fff68b7acb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 27.119713] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e958 [ 27.127063] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 27.134314] RBP: 00000000004be300 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 27.141563] R10: 0000000020000001 R11: 0000000000000246 R12: 0000000000000001 [ 27.148816] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 27.156679] Dumping ftrace buffer: [ 27.160304] (ftrace buffer empty) [ 27.163993] Kernel Offset: disabled [ 27.167601] Rebooting in 86400 seconds..