[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.294593] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.251366] random: sshd: uninitialized urandom read (32 bytes read) [ 24.672415] random: sshd: uninitialized urandom read (32 bytes read) [ 25.449427] random: sshd: uninitialized urandom read (32 bytes read) [ 25.617642] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 31.072813] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.162821] WARNING: CPU: 0 PID: 4482 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.171198] Kernel panic - not syncing: panic_on_warn set ... [ 31.171198] [ 31.178542] CPU: 0 PID: 4482 Comm: syz-executor125 Not tainted 4.17.0-rc4+ #41 [ 31.185881] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.195211] Call Trace: [ 31.197780] dump_stack+0x1b9/0x294 [ 31.201388] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.206559] ? smc_unhash_sk+0x2d0/0x4a0 [ 31.210600] panic+0x22f/0x4de [ 31.213770] ? add_taint.cold.5+0x16/0x16 [ 31.217898] ? __warn.cold.8+0x148/0x1b3 [ 31.221940] ? __warn.cold.8+0x117/0x1b3 [ 31.225979] ? smc_unhash_sk+0x345/0x4a0 [ 31.230025] __warn.cold.8+0x163/0x1b3 [ 31.233893] ? smc_unhash_sk+0x345/0x4a0 [ 31.237932] report_bug+0x252/0x2d0 [ 31.241542] do_error_trap+0x1de/0x490 [ 31.245405] ? graph_lock+0x170/0x170 [ 31.249184] ? math_error+0x420/0x420 [ 31.252974] ? lock_acquire+0x1dc/0x520 [ 31.256927] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.261749] do_invalid_op+0x1b/0x20 [ 31.265441] invalid_op+0x14/0x20 [ 31.268871] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.273515] RSP: 0018:ffff8801afa3f488 EFLAGS: 00010293 [ 31.278857] RAX: ffff8801afaca480 RBX: ffff8801b1a417c0 RCX: ffffffff87404cbe [ 31.286102] RDX: 0000000000000000 RSI: ffffffff87404d75 RDI: 0000000000000005 [ 31.293350] RBP: ffff8801afa3f570 R08: ffff8801afaca480 R09: ffffed0036348308 [ 31.300594] R10: ffffed0036348308 R11: ffff8801b1a41843 R12: 1ffff10035f47e95 [ 31.307839] R13: ffff8801afa3f548 R14: ffffffff8970cc20 R15: ffff8801b1a41840 [ 31.315094] ? smc_unhash_sk+0x28e/0x4a0 [ 31.319157] ? smc_unhash_sk+0x345/0x4a0 [ 31.323197] ? smc_unhash_sk+0x345/0x4a0 [ 31.327235] ? smc_rx_data_available+0x100/0x100 [ 31.331980] ? release_sock+0x1e2/0x2b0 [ 31.335942] ? __local_bh_enable_ip+0x161/0x230 [ 31.340592] ? __release_sock+0x3a0/0x3a0 [ 31.344721] ? smc_release+0x269/0x610 [ 31.348587] ? trace_hardirqs_on+0xd/0x10 [ 31.352714] ? __local_bh_enable_ip+0x161/0x230 [ 31.357362] smc_release+0x36e/0x610 [ 31.361061] sock_release+0x96/0x1b0 [ 31.364752] ? sock_alloc_file+0x4e0/0x4e0 [ 31.368963] sock_close+0x16/0x20 [ 31.372395] __fput+0x34d/0x890 [ 31.375655] ? fput+0x1a0/0x1a0 [ 31.378917] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.383393] ____fput+0x15/0x20 [ 31.386652] task_work_run+0x1e4/0x290 [ 31.390523] ? task_work_cancel+0x240/0x240 [ 31.394824] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.400340] ? switch_task_namespaces+0xa2/0xd0 [ 31.404997] do_exit+0x1aee/0x2730 [ 31.408530] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.412919] ? mm_update_next_owner+0x980/0x980 [ 31.417569] ? ___sys_sendmsg+0x31a/0x940 [ 31.421698] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.426691] ? kfree+0x1e9/0x260 [ 31.430038] ? ___sys_sendmsg+0x31f/0x940 [ 31.434171] ? copy_msghdr_from_user+0x560/0x560 [ 31.438904] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.443896] ? graph_lock+0x170/0x170 [ 31.447686] ? pud_val+0x80/0xf0 [ 31.451037] ? pmd_val+0xf0/0xf0 [ 31.454388] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.459903] ? __fget_light+0x2ef/0x430 [ 31.463855] ? __handle_mm_fault+0x93a/0x4310 [ 31.468329] ? fget_raw+0x20/0x20 [ 31.471762] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 31.476502] ? graph_lock+0x170/0x170 [ 31.480290] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.485816] ? sockfd_lookup_light+0xc5/0x160 [ 31.490290] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.495805] ? __sys_sendmmsg+0x4b3/0x6f0 [ 31.499934] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 31.504244] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.509761] ? __handle_mm_fault+0x4310/0x4310 [ 31.514325] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.519841] ? __do_page_fault+0x441/0xe40 [ 31.524058] do_group_exit+0x16f/0x430 [ 31.527925] ? mm_fault_error+0x380/0x380 [ 31.532051] ? __ia32_sys_exit+0x50/0x50 [ 31.536092] ? do_syscall_64+0x92/0x800 [ 31.540047] __x64_sys_exit_group+0x3e/0x50 [ 31.544354] do_syscall_64+0x1b1/0x800 [ 31.548230] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.553144] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.558057] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.563401] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.568224] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.573391] RIP: 0033:0x43efb8 [ 31.576559] RSP: 002b:00007fffb29adcc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.584260] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043efb8 [ 31.591505] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.598751] RBP: 00000000004be960 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.606000] R10: 0000000020000800 R11: 0000000000000246 R12: 0000000000000001 [ 31.613254] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.621067] Dumping ftrace buffer: [ 31.624685] (ftrace buffer empty) [ 31.628373] Kernel Offset: disabled [ 31.631979] Rebooting in 86400 seconds..