[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.914458] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.302904] random: sshd: uninitialized urandom read (32 bytes read) [ 20.555071] random: sshd: uninitialized urandom read (32 bytes read) [ 21.263137] random: sshd: uninitialized urandom read (32 bytes read) [ 21.413534] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. [ 26.824172] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.926695] WARNING: CPU: 1 PID: 4489 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 26.935064] Kernel panic - not syncing: panic_on_warn set ... [ 26.935064] [ 26.942407] CPU: 1 PID: 4489 Comm: syz-executor096 Not tainted 4.17.0-rc2+ #28 [ 26.949742] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.959068] Call Trace: [ 26.961633] dump_stack+0x1b9/0x294 [ 26.965246] ? dump_stack_print_info.cold.2+0x52/0x52 [ 26.970418] ? smc_unhash_sk+0x2b0/0x4a0 [ 26.974457] panic+0x22f/0x4de [ 26.977625] ? add_taint.cold.5+0x16/0x16 [ 26.981751] ? __warn.cold.8+0x148/0x1b3 [ 26.985790] ? __warn.cold.8+0x117/0x1b3 [ 26.989826] ? smc_unhash_sk+0x345/0x4a0 [ 26.993865] __warn.cold.8+0x163/0x1b3 [ 26.997738] ? smc_unhash_sk+0x345/0x4a0 [ 27.001783] report_bug+0x252/0x2d0 [ 27.005388] do_error_trap+0x1de/0x490 [ 27.009256] ? graph_lock+0x170/0x170 [ 27.013039] ? math_error+0x420/0x420 [ 27.016822] ? lock_acquire+0x1dc/0x520 [ 27.020775] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.025598] do_invalid_op+0x1b/0x20 [ 27.029289] invalid_op+0x14/0x20 [ 27.032721] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 27.037365] RSP: 0018:ffff8801ad047488 EFLAGS: 00010293 [ 27.042707] RAX: ffff8801b2b60000 RBX: ffff8801ae5c07c0 RCX: ffffffff873fc8de [ 27.049953] RDX: 0000000000000000 RSI: ffffffff873fc995 RDI: 0000000000000005 [ 27.057200] RBP: ffff8801ad047570 R08: ffff8801b2b60000 R09: ffffed0035cb8108 [ 27.064447] R10: ffffed0035cb8108 R11: ffff8801ae5c0843 R12: 1ffff10035a08e95 [ 27.071695] R13: ffff8801ad047548 R14: ffffffff8970e060 R15: ffff8801ae5c0840 [ 27.078949] ? smc_unhash_sk+0x28e/0x4a0 [ 27.082988] ? smc_unhash_sk+0x345/0x4a0 [ 27.087035] ? smc_unhash_sk+0x345/0x4a0 [ 27.091075] ? smc_hash_sk+0x2f0/0x2f0 [ 27.094940] ? release_sock+0x1e2/0x2b0 [ 27.098894] ? __local_bh_enable_ip+0x161/0x230 [ 27.103539] ? __release_sock+0x3a0/0x3a0 [ 27.107663] ? smc_release+0x269/0x610 [ 27.111527] ? trace_hardirqs_on+0xd/0x10 [ 27.115652] ? __local_bh_enable_ip+0x161/0x230 [ 27.120300] smc_release+0x36e/0x610 [ 27.124001] sock_release+0x96/0x1b0 [ 27.127708] ? sock_alloc_file+0x4e0/0x4e0 [ 27.131922] sock_close+0x16/0x20 [ 27.135382] __fput+0x34d/0x890 [ 27.138642] ? fput+0x1a0/0x1a0 [ 27.141899] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.146373] ____fput+0x15/0x20 [ 27.149631] task_work_run+0x1e4/0x290 [ 27.153496] ? task_work_cancel+0x240/0x240 [ 27.157807] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 27.163325] ? switch_task_namespaces+0xa2/0xd0 [ 27.167972] do_exit+0x1aee/0x2730 [ 27.171492] ? mm_update_next_owner+0x980/0x980 [ 27.176138] ? kasan_check_write+0x14/0x20 [ 27.180352] ? do_raw_spin_lock+0xc1/0x200 [ 27.184566] ? trace_hardirqs_off+0xd/0x10 [ 27.188779] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 27.193861] ? debug_check_no_obj_freed+0x2ff/0x584 [ 27.198854] ? __local_bh_enable_ip+0x161/0x230 [ 27.203502] ? kasan_check_read+0x11/0x20 [ 27.207629] ? rcu_is_watching+0x85/0x140 [ 27.211755] ? rcu_pm_notify+0xc0/0xc0 [ 27.215623] ? ___sys_sendmsg+0x31a/0x940 [ 27.219749] ? kfree+0x1e9/0x260 [ 27.223093] ? ___sys_sendmsg+0x31f/0x940 [ 27.227220] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.232735] ? copy_msghdr_from_user+0x560/0x560 [ 27.237469] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 27.242201] ? graph_lock+0x170/0x170 [ 27.245987] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.251507] ? __fget_light+0x2ef/0x430 [ 27.255457] ? fget_raw+0x20/0x20 [ 27.258887] ? find_held_lock+0x36/0x1c0 [ 27.262934] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.268448] ? sockfd_lookup_light+0xc5/0x160 [ 27.272922] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.278435] ? __sys_sendmsg+0x1aa/0x270 [ 27.282471] ? __ia32_sys_shutdown+0x80/0x80 [ 27.286858] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.292371] ? __do_page_fault+0x441/0xe40 [ 27.296590] do_group_exit+0x16f/0x430 [ 27.300457] ? __ia32_sys_exit+0x50/0x50 [ 27.304494] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 27.309313] ? do_syscall_64+0x92/0x800 [ 27.313268] __x64_sys_exit_group+0x3e/0x50 [ 27.317567] do_syscall_64+0x1b1/0x800 [ 27.321434] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.326339] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.331248] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 27.336595] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.341420] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.346586] RIP: 0033:0x43e9f8 [ 27.349753] RSP: 002b:00007ffc01177808 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 27.357441] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e9f8 [ 27.364686] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 27.371933] RBP: 00000000004be3a0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 27.379176] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 27.386423] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 27.394193] Dumping ftrace buffer: [ 27.397787] (ftrace buffer empty) [ 27.401472] Kernel Offset: disabled [ 27.405077] Rebooting in 86400 seconds..