[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.322312] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.247612] random: sshd: uninitialized urandom read (32 bytes read) [ 25.741064] random: sshd: uninitialized urandom read (32 bytes read) [ 26.431469] random: sshd: uninitialized urandom read (32 bytes read) [ 26.588284] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 32.104393] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.194881] WARNING: CPU: 1 PID: 4496 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.203255] Kernel panic - not syncing: panic_on_warn set ... [ 32.203255] [ 32.210603] CPU: 1 PID: 4496 Comm: syz-executor070 Not tainted 4.17.0-rc3+ #35 [ 32.217940] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.227271] Call Trace: [ 32.229841] dump_stack+0x1b9/0x294 [ 32.233463] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.238637] ? smc_unhash_sk+0x310/0x4a0 [ 32.242676] panic+0x22f/0x4de [ 32.245852] ? add_taint.cold.5+0x16/0x16 [ 32.249988] ? __warn.cold.8+0x148/0x1b3 [ 32.254048] ? __warn.cold.8+0x117/0x1b3 [ 32.258098] ? smc_unhash_sk+0x345/0x4a0 [ 32.262139] __warn.cold.8+0x163/0x1b3 [ 32.266012] ? smc_unhash_sk+0x345/0x4a0 [ 32.270070] report_bug+0x252/0x2d0 [ 32.273681] do_error_trap+0x1de/0x490 [ 32.277550] ? graph_lock+0x170/0x170 [ 32.281330] ? math_error+0x420/0x420 [ 32.285115] ? lock_acquire+0x1dc/0x520 [ 32.289072] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.293896] do_invalid_op+0x1b/0x20 [ 32.297591] invalid_op+0x14/0x20 [ 32.301031] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.305679] RSP: 0018:ffff8801b172f488 EFLAGS: 00010293 [ 32.311030] RAX: ffff8801ad484280 RBX: ffff8801adf8a7c0 RCX: ffffffff87402b7e [ 32.318283] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005 [ 32.325532] RBP: ffff8801b172f570 R08: ffff8801ad484280 R09: ffffed0035bf1508 [ 32.332784] R10: ffffed0035bf1508 R11: ffff8801adf8a843 R12: 1ffff100362e5e95 [ 32.340040] R13: ffff8801b172f548 R14: ffffffff8970e840 R15: ffff8801adf8a840 [ 32.347296] ? smc_unhash_sk+0x28e/0x4a0 [ 32.351337] ? smc_unhash_sk+0x345/0x4a0 [ 32.355379] ? smc_unhash_sk+0x345/0x4a0 [ 32.359423] ? smc_rx_data_available+0x100/0x100 [ 32.364160] ? release_sock+0x1e2/0x2b0 [ 32.368118] ? __local_bh_enable_ip+0x161/0x230 [ 32.372771] ? __release_sock+0x3a0/0x3a0 [ 32.376901] ? smc_release+0x269/0x610 [ 32.380769] ? trace_hardirqs_on+0xd/0x10 [ 32.384898] ? __local_bh_enable_ip+0x161/0x230 [ 32.389549] smc_release+0x36e/0x610 [ 32.393250] sock_release+0x96/0x1b0 [ 32.396946] ? sock_alloc_file+0x4e0/0x4e0 [ 32.401161] sock_close+0x16/0x20 [ 32.404602] __fput+0x34d/0x890 [ 32.407873] ? fput+0x1a0/0x1a0 [ 32.411138] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.415615] ____fput+0x15/0x20 [ 32.418881] task_work_run+0x1e4/0x290 [ 32.422751] ? task_work_cancel+0x240/0x240 [ 32.427057] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.432573] ? switch_task_namespaces+0xa2/0xd0 [ 32.437225] do_exit+0x1aee/0x2730 [ 32.440749] ? mm_update_next_owner+0x980/0x980 [ 32.445416] ? find_held_lock+0x36/0x1c0 [ 32.449471] ? lock_downgrade+0x8e0/0x8e0 [ 32.453600] ? lock_downgrade+0x8e0/0x8e0 [ 32.457735] ? kasan_check_read+0x11/0x20 [ 32.461864] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.466257] ? __local_bh_enable_ip+0x161/0x230 [ 32.470914] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.475918] ? release_sock+0x1e2/0x2b0 [ 32.479875] ? trace_hardirqs_on+0xd/0x10 [ 32.484014] ? __local_bh_enable_ip+0x161/0x230 [ 32.488670] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.493063] ? release_sock+0x1e2/0x2b0 [ 32.497029] ? __release_sock+0x3a0/0x3a0 [ 32.501163] ? __local_bh_enable_ip+0x161/0x230 [ 32.505811] ? lock_sock_nested+0xe7/0x120 [ 32.510037] ? smc_sendmsg+0x2d5/0x370 [ 32.513913] ? smc_sendpage+0x1a0/0x1a0 [ 32.517866] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.523381] ? sock_sendmsg+0x5a/0x120 [ 32.527255] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.532772] ? __sys_sendto+0x475/0x670 [ 32.536728] ? __ia32_sys_getpeername+0xb0/0xb0 [ 32.541378] ? lock_downgrade+0x8e0/0x8e0 [ 32.545509] ? handle_mm_fault+0x8c0/0xc70 [ 32.549727] ? handle_mm_fault+0x55a/0xc70 [ 32.553952] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.559479] do_group_exit+0x16f/0x430 [ 32.563346] ? mm_fault_error+0x380/0x380 [ 32.567476] ? __ia32_sys_exit+0x50/0x50 [ 32.571521] ? do_syscall_64+0x92/0x800 [ 32.575474] __x64_sys_exit_group+0x3e/0x50 [ 32.579773] do_syscall_64+0x1b1/0x800 [ 32.583637] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.588460] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.593369] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.598281] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.603625] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.608464] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.613639] RIP: 0033:0x43e918 [ 32.616808] RSP: 002b:00007ffd398e4118 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.624493] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e918 [ 32.631746] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.638993] RBP: 00000000004be2c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.646242] R10: 0000000020000010 R11: 0000000000000246 R12: 0000000000000001 [ 32.653487] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.661304] Dumping ftrace buffer: [ 32.664904] (ftrace buffer empty) [ 32.668591] Kernel Offset: disabled [ 32.672195] Rebooting in 86400 seconds..