[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.315645] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.228466] random: sshd: uninitialized urandom read (32 bytes read) [ 23.478572] random: sshd: uninitialized urandom read (32 bytes read) [ 24.227122] random: sshd: uninitialized urandom read (32 bytes read) [ 24.382201] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. [ 29.790159] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.882505] WARNING: CPU: 1 PID: 4518 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.890914] Kernel panic - not syncing: panic_on_warn set ... [ 29.890914] [ 29.898263] CPU: 1 PID: 4518 Comm: syz-executor506 Not tainted 4.17.0-rc4+ #54 [ 29.905600] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.914938] Call Trace: [ 29.917529] dump_stack+0x1b9/0x294 [ 29.921157] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.926341] ? smc_unhash_sk+0x260/0x4a0 [ 29.930393] panic+0x22f/0x4de [ 29.933577] ? add_taint.cold.5+0x16/0x16 [ 29.937724] ? __warn.cold.8+0x148/0x1b3 [ 29.941769] ? __warn.cold.8+0x117/0x1b3 [ 29.945817] ? smc_unhash_sk+0x345/0x4a0 [ 29.949863] __warn.cold.8+0x163/0x1b3 [ 29.953743] ? smc_unhash_sk+0x345/0x4a0 [ 29.957788] report_bug+0x252/0x2d0 [ 29.962107] do_error_trap+0x1de/0x490 [ 29.965990] ? graph_lock+0x170/0x170 [ 29.969785] ? math_error+0x420/0x420 [ 29.973579] ? lock_acquire+0x1dc/0x520 [ 29.977558] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.982394] do_invalid_op+0x1b/0x20 [ 29.986099] invalid_op+0x14/0x20 [ 29.989540] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.994186] RSP: 0018:ffff8801b4e17488 EFLAGS: 00010293 [ 29.999531] RAX: ffff8801a9544680 RBX: ffff8801adee37c0 RCX: ffffffff8740fb2e [ 30.006780] RDX: 0000000000000000 RSI: ffffffff8740fbe5 RDI: 0000000000000005 [ 30.014039] RBP: ffff8801b4e17570 R08: ffff8801a9544680 R09: ffffed0035bdc708 [ 30.021299] R10: ffffed0035bdc708 R11: ffff8801adee3843 R12: 1ffff100369c2e95 [ 30.028550] R13: ffff8801b4e17548 R14: ffffffff8970dc60 R15: ffff8801adee3840 [ 30.035812] ? smc_unhash_sk+0x28e/0x4a0 [ 30.039865] ? smc_unhash_sk+0x345/0x4a0 [ 30.043911] ? smc_unhash_sk+0x345/0x4a0 [ 30.047958] ? smc_rx_data_available+0x100/0x100 [ 30.052696] ? release_sock+0x1e2/0x2b0 [ 30.056657] ? __local_bh_enable_ip+0x161/0x230 [ 30.061318] ? __release_sock+0x3a0/0x3a0 [ 30.065449] ? smc_release+0x269/0x610 [ 30.069323] ? trace_hardirqs_on+0xd/0x10 [ 30.073464] ? __local_bh_enable_ip+0x161/0x230 [ 30.078129] smc_release+0x36e/0x610 [ 30.081831] sock_release+0x96/0x1b0 [ 30.085530] ? sock_alloc_file+0x4e0/0x4e0 [ 30.089749] sock_close+0x16/0x20 [ 30.093198] __fput+0x34d/0x890 [ 30.096460] ? fput+0x1a0/0x1a0 [ 30.099724] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.104203] ____fput+0x15/0x20 [ 30.107465] task_work_run+0x1e4/0x290 [ 30.111337] ? task_work_cancel+0x240/0x240 [ 30.115642] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.121159] ? switch_task_namespaces+0xa2/0xd0 [ 30.125810] do_exit+0x1aee/0x2730 [ 30.129335] ? mm_update_next_owner+0x980/0x980 [ 30.133988] ? kasan_check_read+0x11/0x20 [ 30.138122] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.142515] ? __local_bh_enable_ip+0x161/0x230 [ 30.147171] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.152168] ? release_sock+0x1e2/0x2b0 [ 30.156122] ? trace_hardirqs_on+0xd/0x10 [ 30.160252] ? __local_bh_enable_ip+0x161/0x230 [ 30.164903] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.169308] ? kasan_check_read+0x11/0x20 [ 30.173435] ? rcu_is_watching+0x85/0x140 [ 30.177577] ? rcu_pm_notify+0xc0/0xc0 [ 30.181453] ? ___sys_sendmsg+0x31a/0x940 [ 30.185602] ? kfree+0x1e9/0x260 [ 30.188951] ? ___sys_sendmsg+0x31f/0x940 [ 30.193089] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.198613] ? __handle_mm_fault+0x93a/0x4310 [ 30.203103] ? copy_msghdr_from_user+0x560/0x560 [ 30.207841] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 30.212588] ? graph_lock+0x170/0x170 [ 30.216385] ? find_held_lock+0x36/0x1c0 [ 30.220430] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.225951] ? __fget_light+0x2ef/0x430 [ 30.229917] ? fget_raw+0x20/0x20 [ 30.233364] ? find_held_lock+0x36/0x1c0 [ 30.237410] ? lock_downgrade+0x8e0/0x8e0 [ 30.241541] ? handle_mm_fault+0x8c0/0xc70 [ 30.245775] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.251311] ? sockfd_lookup_light+0xc5/0x160 [ 30.255802] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.261331] ? __sys_sendmsg+0x1aa/0x270 [ 30.265375] ? __ia32_sys_shutdown+0x80/0x80 [ 30.269769] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.275301] ? __do_page_fault+0x441/0xe40 [ 30.279521] do_group_exit+0x16f/0x430 [ 30.283392] ? __ia32_sys_exit+0x50/0x50 [ 30.287445] ? do_syscall_64+0x92/0x800 [ 30.291413] __x64_sys_exit_group+0x3e/0x50 [ 30.295717] do_syscall_64+0x1b1/0x800 [ 30.299590] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.304510] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.309429] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.314778] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.319608] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.324780] RIP: 0033:0x43ead8 [ 30.327971] RSP: 002b:00007ffc344557b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.335663] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ead8 [ 30.342913] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.350166] RBP: 00000000004be480 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.357420] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 30.364675] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.372609] Dumping ftrace buffer: [ 30.376240] (ftrace buffer empty) [ 30.379929] Kernel Offset: disabled [ 30.383538] Rebooting in 86400 seconds..