[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.335585] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.978498] random: sshd: uninitialized urandom read (32 bytes read) [ 23.210015] random: sshd: uninitialized urandom read (32 bytes read) [ 23.956738] random: sshd: uninitialized urandom read (32 bytes read) [ 24.119000] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 29.524414] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.617816] WARNING: CPU: 1 PID: 4548 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.626229] Kernel panic - not syncing: panic_on_warn set ... [ 29.626229] [ 29.633584] CPU: 1 PID: 4548 Comm: syz-executor530 Not tainted 4.17.0-rc6+ #58 [ 29.640923] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.650269] Call Trace: [ 29.652846] dump_stack+0x1b9/0x294 [ 29.656464] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.661644] ? smc_unhash_sk+0x270/0x4a0 [ 29.665688] panic+0x22f/0x4de [ 29.668860] ? add_taint.cold.5+0x16/0x16 [ 29.672990] ? __warn.cold.8+0x148/0x1b3 [ 29.677043] ? __warn.cold.8+0x117/0x1b3 [ 29.681099] ? smc_unhash_sk+0x345/0x4a0 [ 29.685142] __warn.cold.8+0x163/0x1b3 [ 29.689030] ? smc_unhash_sk+0x345/0x4a0 [ 29.693091] report_bug+0x252/0x2d0 [ 29.696707] do_error_trap+0x1de/0x490 [ 29.700575] ? graph_lock+0x170/0x170 [ 29.704359] ? math_error+0x420/0x420 [ 29.708145] ? lock_acquire+0x1dc/0x520 [ 29.712108] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.716933] do_invalid_op+0x1b/0x20 [ 29.720631] invalid_op+0x14/0x20 [ 29.724068] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.728712] RSP: 0018:ffff8801acf07488 EFLAGS: 00010293 [ 29.734058] RAX: ffff8801ac484680 RBX: ffff8801ac6f77c0 RCX: ffffffff8741441e [ 29.741313] RDX: 0000000000000000 RSI: ffffffff874144d5 RDI: 0000000000000005 [ 29.748566] RBP: ffff8801acf07570 R08: ffff8801ac484680 R09: ffffed00358def08 [ 29.755818] R10: ffffed00358def08 R11: ffff8801ac6f7843 R12: 1ffff100359e0e95 [ 29.763071] R13: ffff8801acf07548 R14: ffffffff8970da60 R15: ffff8801ac6f7840 [ 29.770348] ? smc_unhash_sk+0x28e/0x4a0 [ 29.774392] ? smc_unhash_sk+0x345/0x4a0 [ 29.778436] ? smc_unhash_sk+0x345/0x4a0 [ 29.782484] ? smc_rx_data_available+0x100/0x100 [ 29.787230] ? release_sock+0x1e2/0x2b0 [ 29.791192] ? __local_bh_enable_ip+0x161/0x230 [ 29.795841] ? __release_sock+0x3a0/0x3a0 [ 29.799981] ? smc_release+0x269/0x610 [ 29.803854] ? trace_hardirqs_on+0xd/0x10 [ 29.807984] ? __local_bh_enable_ip+0x161/0x230 [ 29.812648] smc_release+0x36e/0x610 [ 29.816359] sock_release+0x96/0x1b0 [ 29.820055] ? sock_alloc_file+0x4e0/0x4e0 [ 29.824271] sock_close+0x16/0x20 [ 29.827711] __fput+0x34d/0x890 [ 29.830983] ? fput+0x1a0/0x1a0 [ 29.834253] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.838735] ____fput+0x15/0x20 [ 29.842000] task_work_run+0x1e4/0x290 [ 29.845870] ? task_work_cancel+0x240/0x240 [ 29.850176] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.855703] ? switch_task_namespaces+0xa2/0xd0 [ 29.860365] do_exit+0x1aee/0x2730 [ 29.863889] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.868295] ? mm_update_next_owner+0x980/0x980 [ 29.872951] ? ___sys_sendmsg+0x31a/0x940 [ 29.877093] ? rcu_read_lock_sched_held+0x108/0x120 [ 29.882096] ? kfree+0x1e9/0x260 [ 29.885453] ? ___sys_sendmsg+0x31f/0x940 [ 29.889587] ? copy_msghdr_from_user+0x560/0x560 [ 29.894328] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.899325] ? graph_lock+0x170/0x170 [ 29.903110] ? pud_val+0x80/0xf0 [ 29.906478] ? pmd_val+0xf0/0xf0 [ 29.909831] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.915356] ? __fget_light+0x2ef/0x430 [ 29.919326] ? __handle_mm_fault+0x93a/0x4310 [ 29.923818] ? fget_raw+0x20/0x20 [ 29.927277] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 29.932039] ? graph_lock+0x170/0x170 [ 29.935856] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 29.941390] ? sockfd_lookup_light+0xc5/0x160 [ 29.945870] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.951396] ? __sys_sendmmsg+0x4b3/0x6f0 [ 29.955528] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 29.959838] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.965359] ? __handle_mm_fault+0x4310/0x4310 [ 29.969935] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.975453] ? __do_page_fault+0x441/0xe40 [ 29.979686] do_group_exit+0x16f/0x430 [ 29.983555] ? mm_fault_error+0x380/0x380 [ 29.987693] ? __ia32_sys_exit+0x50/0x50 [ 29.991740] ? do_syscall_64+0x92/0x800 [ 29.995696] __x64_sys_exit_group+0x3e/0x50 [ 29.999996] do_syscall_64+0x1b1/0x800 [ 30.003868] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.008780] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.013695] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.019040] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.023869] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.029047] RIP: 0033:0x43edd8 [ 30.032227] RSP: 002b:00007fff405c53a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.039932] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043edd8 [ 30.047182] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.054444] RBP: 00000000004be780 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.061706] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 30.068965] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.076879] Dumping ftrace buffer: [ 30.080586] (ftrace buffer empty) [ 30.084284] Kernel Offset: disabled [ 30.087899] Rebooting in 86400 seconds..