[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.237075] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 19.370286] random: sshd: uninitialized urandom read (32 bytes read) [ 19.692279] random: sshd: uninitialized urandom read (32 bytes read) [ 20.442094] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.600081] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. [ 26.086926] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.182262] WARNING: CPU: 1 PID: 4453 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 26.190674] Kernel panic - not syncing: panic_on_warn set ... [ 26.190674] [ 26.198024] CPU: 1 PID: 4453 Comm: syz-executor822 Not tainted 4.17.0-rc4+ #41 [ 26.205363] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.214694] Call Trace: [ 26.217264] dump_stack+0x1b9/0x294 [ 26.220870] ? dump_stack_print_info.cold.2+0x52/0x52 [ 26.226048] ? smc_unhash_sk+0x2d0/0x4a0 [ 26.230090] panic+0x22f/0x4de [ 26.233273] ? add_taint.cold.5+0x16/0x16 [ 26.237404] ? __warn.cold.8+0x148/0x1b3 [ 26.241453] ? __warn.cold.8+0x117/0x1b3 [ 26.245493] ? smc_unhash_sk+0x345/0x4a0 [ 26.249535] __warn.cold.8+0x163/0x1b3 [ 26.253401] ? smc_unhash_sk+0x345/0x4a0 [ 26.257444] report_bug+0x252/0x2d0 [ 26.261063] do_error_trap+0x1de/0x490 [ 26.264930] ? graph_lock+0x170/0x170 [ 26.268711] ? math_error+0x420/0x420 [ 26.272493] ? lock_acquire+0x1dc/0x520 [ 26.276449] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.281278] do_invalid_op+0x1b/0x20 [ 26.284985] invalid_op+0x14/0x20 [ 26.288424] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 26.293067] RSP: 0018:ffff8801b4727488 EFLAGS: 00010293 [ 26.298411] RAX: ffff8801b46c8200 RBX: ffff8801b40b57c0 RCX: ffffffff87404cbe [ 26.305659] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 26.312909] RBP: ffff8801b4727570 R08: ffff8801b46c8200 R09: ffffed0036816b08 [ 26.320168] R10: ffffed0036816b08 R11: ffff8801b40b5843 R12: 1ffff100368e4e95 [ 26.327419] R13: ffff8801b4727548 R14: ffffffff8970cc20 R15: ffff8801b40b5840 [ 26.334683] ? smc_unhash_sk+0x28e/0x4a0 [ 26.338726] ? smc_unhash_sk+0x345/0x4a0 [ 26.342770] ? smc_unhash_sk+0x345/0x4a0 [ 26.346810] ? smc_rx_data_available+0x100/0x100 [ 26.351545] ? release_sock+0x1e2/0x2b0 [ 26.355510] ? __local_bh_enable_ip+0x161/0x230 [ 26.360168] ? __release_sock+0x3a0/0x3a0 [ 26.364299] ? smc_release+0x269/0x610 [ 26.368166] ? trace_hardirqs_on+0xd/0x10 [ 26.372295] ? __local_bh_enable_ip+0x161/0x230 [ 26.376942] smc_release+0x36e/0x610 [ 26.380657] sock_release+0x96/0x1b0 [ 26.384352] ? sock_alloc_file+0x4e0/0x4e0 [ 26.388569] sock_close+0x16/0x20 [ 26.392012] __fput+0x34d/0x890 [ 26.395297] ? fput+0x1a0/0x1a0 [ 26.398569] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.403054] ____fput+0x15/0x20 [ 26.406325] task_work_run+0x1e4/0x290 [ 26.410205] ? task_work_cancel+0x240/0x240 [ 26.414514] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 26.420036] ? switch_task_namespaces+0xa2/0xd0 [ 26.424685] do_exit+0x1aee/0x2730 [ 26.428219] ? mm_update_next_owner+0x980/0x980 [ 26.432871] ? find_held_lock+0x36/0x1c0 [ 26.437266] ? lock_downgrade+0x8e0/0x8e0 [ 26.441391] ? lock_downgrade+0x8e0/0x8e0 [ 26.445529] ? kasan_check_read+0x11/0x20 [ 26.449656] ? do_raw_spin_unlock+0x9e/0x2e0 [ 26.454047] ? __local_bh_enable_ip+0x161/0x230 [ 26.458694] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.463690] ? release_sock+0x1e2/0x2b0 [ 26.467642] ? trace_hardirqs_on+0xd/0x10 [ 26.471770] ? __local_bh_enable_ip+0x161/0x230 [ 26.476420] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.480808] ? release_sock+0x1e2/0x2b0 [ 26.484762] ? __release_sock+0x3a0/0x3a0 [ 26.488886] ? __local_bh_enable_ip+0x161/0x230 [ 26.493534] ? lock_sock_nested+0xe7/0x120 [ 26.497751] ? smc_sendmsg+0x2d5/0x370 [ 26.501618] ? smc_sendpage+0x1a0/0x1a0 [ 26.505572] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.511086] ? sock_sendmsg+0x5a/0x120 [ 26.514958] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.520472] ? __sys_sendto+0x475/0x670 [ 26.524428] ? __ia32_sys_getpeername+0xb0/0xb0 [ 26.529075] ? __fd_install+0x2de/0x880 [ 26.533034] ? get_unused_fd_flags+0x190/0x190 [ 26.537596] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.543112] ? alloc_file+0x44/0x3e0 [ 26.546806] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 26.552323] ? sock_alloc_file+0x2a4/0x4e0 [ 26.556555] ? __alloc_fd+0x700/0x700 [ 26.560357] ? fd_install+0x4d/0x60 [ 26.563966] do_group_exit+0x16f/0x430 [ 26.567834] ? __ia32_sys_exit+0x50/0x50 [ 26.571877] ? do_syscall_64+0x92/0x800 [ 26.575831] __x64_sys_exit_group+0x3e/0x50 [ 26.580130] do_syscall_64+0x1b1/0x800 [ 26.584010] ? syscall_return_slowpath+0x5c0/0x5c0 [ 26.588934] ? syscall_return_slowpath+0x30f/0x5c0 [ 26.593847] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 26.599189] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.604041] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 26.609210] RIP: 0033:0x43e8b8 [ 26.612383] RSP: 002b:00007ffc8de26268 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 26.620074] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 26.627328] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 26.634579] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 26.641825] R10: 0008000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 26.649071] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 26.656925] Dumping ftrace buffer: [ 26.660541] (ftrace buffer empty) [ 26.664227] Kernel Offset: disabled [ 26.667834] Rebooting in 86400 seconds..