[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.206430] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.149515] random: sshd: uninitialized urandom read (32 bytes read) [ 25.455992] random: sshd: uninitialized urandom read (32 bytes read) [ 26.184585] random: sshd: uninitialized urandom read (32 bytes read) [ 26.345920] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.36' (ECDSA) to the list of known hosts. [ 31.926243] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.020961] WARNING: CPU: 0 PID: 4543 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.029377] Kernel panic - not syncing: panic_on_warn set ... [ 32.029377] [ 32.036737] CPU: 0 PID: 4543 Comm: syz-executor994 Not tainted 4.17.0-rc3+ #34 [ 32.044112] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.053709] Call Trace: [ 32.056302] dump_stack+0x1b9/0x294 [ 32.060012] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.065196] ? smc_unhash_sk+0x310/0x4a0 [ 32.069247] panic+0x22f/0x4de [ 32.072424] ? add_taint.cold.5+0x16/0x16 [ 32.076577] ? __warn.cold.8+0x148/0x1b3 [ 32.080638] ? __warn.cold.8+0x117/0x1b3 [ 32.084688] ? smc_unhash_sk+0x345/0x4a0 [ 32.088731] __warn.cold.8+0x163/0x1b3 [ 32.092602] ? smc_unhash_sk+0x345/0x4a0 [ 32.096649] report_bug+0x252/0x2d0 [ 32.100260] do_error_trap+0x1de/0x490 [ 32.104131] ? graph_lock+0x170/0x170 [ 32.107932] ? math_error+0x420/0x420 [ 32.111722] ? lock_acquire+0x1dc/0x520 [ 32.115682] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.120510] do_invalid_op+0x1b/0x20 [ 32.124207] invalid_op+0x14/0x20 [ 32.127641] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.132308] RSP: 0018:ffff8801d9377488 EFLAGS: 00010293 [ 32.137652] RAX: ffff8801ad5ee700 RBX: ffff8801d96e67c0 RCX: ffffffff87402b7e [ 32.144905] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005 [ 32.152182] RBP: ffff8801d9377570 R08: ffff8801ad5ee700 R09: ffffed003b2dcd08 [ 32.159531] R10: ffffed003b2dcd08 R11: ffff8801d96e6843 R12: 1ffff1003b26ee95 [ 32.166810] R13: ffff8801d9377548 R14: ffffffff8970e8a0 R15: ffff8801d96e6840 [ 32.174083] ? smc_unhash_sk+0x28e/0x4a0 [ 32.178133] ? smc_unhash_sk+0x345/0x4a0 [ 32.182717] ? smc_unhash_sk+0x345/0x4a0 [ 32.186775] ? smc_rx_data_available+0x100/0x100 [ 32.191517] ? release_sock+0x1e2/0x2b0 [ 32.195508] ? __local_bh_enable_ip+0x161/0x230 [ 32.200167] ? __release_sock+0x3a0/0x3a0 [ 32.204295] ? smc_release+0x269/0x610 [ 32.208165] ? trace_hardirqs_on+0xd/0x10 [ 32.212291] ? __local_bh_enable_ip+0x161/0x230 [ 32.216955] smc_release+0x36e/0x610 [ 32.220653] sock_release+0x96/0x1b0 [ 32.224353] ? sock_alloc_file+0x4e0/0x4e0 [ 32.228574] sock_close+0x16/0x20 [ 32.232028] __fput+0x34d/0x890 [ 32.235292] ? fput+0x1a0/0x1a0 [ 32.238559] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.243041] ____fput+0x15/0x20 [ 32.246344] task_work_run+0x1e4/0x290 [ 32.250216] ? task_work_cancel+0x240/0x240 [ 32.254523] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.260053] ? switch_task_namespaces+0xa2/0xd0 [ 32.264710] do_exit+0x1aee/0x2730 [ 32.268231] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.272623] ? mm_update_next_owner+0x980/0x980 [ 32.277291] ? ___sys_sendmsg+0x31a/0x940 [ 32.281439] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.286440] ? kfree+0x1e9/0x260 [ 32.289790] ? ___sys_sendmsg+0x31f/0x940 [ 32.293922] ? copy_msghdr_from_user+0x560/0x560 [ 32.298661] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.303661] ? graph_lock+0x170/0x170 [ 32.307441] ? lock_downgrade+0x8e0/0x8e0 [ 32.311589] ? pud_val+0x80/0xf0 [ 32.314947] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.320467] ? __fget_light+0x2ef/0x430 [ 32.324425] ? __handle_mm_fault+0x93a/0x4310 [ 32.328907] ? fget_raw+0x20/0x20 [ 32.332963] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 32.337702] ? graph_lock+0x170/0x170 [ 32.341498] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.347021] ? sockfd_lookup_light+0xc5/0x160 [ 32.351504] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.357040] ? __sys_sendmmsg+0x4b3/0x6f0 [ 32.361176] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 32.365487] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.371063] ? __handle_mm_fault+0x4310/0x4310 [ 32.375754] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.381277] ? __do_page_fault+0x441/0xe40 [ 32.385512] do_group_exit+0x16f/0x430 [ 32.389391] ? mm_fault_error+0x380/0x380 [ 32.393522] ? __ia32_sys_exit+0x50/0x50 [ 32.397575] ? do_syscall_64+0x92/0x800 [ 32.401535] __x64_sys_exit_group+0x3e/0x50 [ 32.405871] do_syscall_64+0x1b1/0x800 [ 32.409745] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.414656] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.419583] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.424932] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.430716] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.435911] RIP: 0033:0x43f618 [ 32.439086] RSP: 002b:00007fffd2b7dd18 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.446780] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f618 [ 32.454038] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.461295] RBP: 00000000004bf000 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.468551] R10: 0000000020000001 R11: 0000000000000246 R12: 0000000000000001 [ 32.475805] R13: 00000000006cd160 R14: 0000000000000000 R15: 0000000000000000 [ 32.483676] Dumping ftrace buffer: [ 32.487363] (ftrace buffer empty) [ 32.491064] Kernel Offset: disabled [ 32.494682] Rebooting in 86400 seconds..