[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.329488] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.808931] random: sshd: uninitialized urandom read (32 bytes read) [ 21.987477] random: sshd: uninitialized urandom read (32 bytes read) [ 22.713793] random: sshd: uninitialized urandom read (32 bytes read) [ 27.399370] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. [ 32.940086] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.033395] WARNING: CPU: 0 PID: 4495 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 33.042379] Kernel panic - not syncing: panic_on_warn set ... [ 33.042379] [ 33.049735] CPU: 0 PID: 4495 Comm: syz-executor208 Not tainted 4.17.0-rc3+ #34 [ 33.057076] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.066426] Call Trace: [ 33.069003] dump_stack+0x1b9/0x294 [ 33.072620] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.077799] ? smc_unhash_sk+0x310/0x4a0 [ 33.081845] panic+0x22f/0x4de [ 33.085044] ? add_taint.cold.5+0x16/0x16 [ 33.089184] ? __warn.cold.8+0x148/0x1b3 [ 33.093224] ? __warn.cold.8+0x117/0x1b3 [ 33.097267] ? smc_unhash_sk+0x345/0x4a0 [ 33.101308] __warn.cold.8+0x163/0x1b3 [ 33.105179] ? smc_unhash_sk+0x345/0x4a0 [ 33.109222] report_bug+0x252/0x2d0 [ 33.112833] do_error_trap+0x1de/0x490 [ 33.116702] ? graph_lock+0x170/0x170 [ 33.120486] ? math_error+0x420/0x420 [ 33.124273] ? lock_acquire+0x1dc/0x520 [ 33.128235] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.133064] do_invalid_op+0x1b/0x20 [ 33.136761] invalid_op+0x14/0x20 [ 33.140198] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 33.144843] RSP: 0018:ffff8801ad01f488 EFLAGS: 00010293 [ 33.150203] RAX: ffff8801ad284200 RBX: ffff8801ad3337c0 RCX: ffffffff87402b7e [ 33.157452] RDX: 0000000000000000 RSI: ffffffff87402c35 RDI: 0000000000000005 [ 33.164700] RBP: ffff8801ad01f570 R08: ffff8801ad284200 R09: ffffed0035a66708 [ 33.171950] R10: ffffed0035a66708 R11: ffff8801ad333843 R12: 1ffff10035a03e95 [ 33.179207] R13: ffff8801ad01f548 R14: ffffffff8970e8a0 R15: ffff8801ad333840 [ 33.186469] ? smc_unhash_sk+0x28e/0x4a0 [ 33.190511] ? smc_unhash_sk+0x345/0x4a0 [ 33.194553] ? smc_unhash_sk+0x345/0x4a0 [ 33.198597] ? smc_rx_data_available+0x100/0x100 [ 33.203339] ? release_sock+0x1e2/0x2b0 [ 33.207297] ? __local_bh_enable_ip+0x161/0x230 [ 33.211951] ? __release_sock+0x3a0/0x3a0 [ 33.216080] ? smc_release+0x269/0x610 [ 33.219946] ? trace_hardirqs_on+0xd/0x10 [ 33.224078] ? __local_bh_enable_ip+0x161/0x230 [ 33.228730] smc_release+0x36e/0x610 [ 33.232432] sock_release+0x96/0x1b0 [ 33.236150] ? sock_alloc_file+0x4e0/0x4e0 [ 33.240364] sock_close+0x16/0x20 [ 33.243798] __fput+0x34d/0x890 [ 33.247069] ? fput+0x1a0/0x1a0 [ 33.250337] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.254817] ____fput+0x15/0x20 [ 33.258094] task_work_run+0x1e4/0x290 [ 33.261978] ? task_work_cancel+0x240/0x240 [ 33.266290] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.276763] ? switch_task_namespaces+0xa2/0xd0 [ 33.281415] do_exit+0x1aee/0x2730 [ 33.284939] ? mm_update_next_owner+0x980/0x980 [ 33.289589] ? kasan_check_read+0x11/0x20 [ 33.293738] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.298128] ? __local_bh_enable_ip+0x161/0x230 [ 33.302778] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.307774] ? release_sock+0x1e2/0x2b0 [ 33.311727] ? trace_hardirqs_on+0xd/0x10 [ 33.315855] ? __local_bh_enable_ip+0x161/0x230 [ 33.320507] ? _raw_spin_unlock_bh+0x30/0x40 [ 33.324911] ? kasan_check_read+0x11/0x20 [ 33.329049] ? rcu_is_watching+0x85/0x140 [ 33.333181] ? rcu_pm_notify+0xc0/0xc0 [ 33.337055] ? ___sys_sendmsg+0x31a/0x940 [ 33.341188] ? kfree+0x1e9/0x260 [ 33.344535] ? ___sys_sendmsg+0x31f/0x940 [ 33.348668] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.354188] ? __handle_mm_fault+0x93a/0x4310 [ 33.358664] ? copy_msghdr_from_user+0x560/0x560 [ 33.363402] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 33.368139] ? graph_lock+0x170/0x170 [ 33.371925] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.377457] ? __fget_light+0x2ef/0x430 [ 33.381438] ? fget_raw+0x20/0x20 [ 33.384896] ? find_held_lock+0x36/0x1c0 [ 33.388965] ? lock_downgrade+0x8e0/0x8e0 [ 33.393095] ? handle_mm_fault+0x8c0/0xc70 [ 33.397325] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.402846] ? sockfd_lookup_light+0xc5/0x160 [ 33.407326] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.412843] ? __sys_sendmsg+0x1aa/0x270 [ 33.416884] ? __ia32_sys_shutdown+0x80/0x80 [ 33.421274] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.426792] ? __do_page_fault+0x441/0xe40 [ 33.431013] do_group_exit+0x16f/0x430 [ 33.434890] ? __ia32_sys_exit+0x50/0x50 [ 33.438947] ? do_syscall_64+0x92/0x800 [ 33.442903] __x64_sys_exit_group+0x3e/0x50 [ 33.447215] do_syscall_64+0x1b1/0x800 [ 33.451093] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.456004] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.460927] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.466272] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.471099] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.476268] RIP: 0033:0x43e968 [ 33.479436] RSP: 002b:00007fff766434f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 33.487123] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e968 [ 33.494383] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 33.501645] RBP: 00000000004be300 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 33.508891] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 33.516166] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 33.524046] Dumping ftrace buffer: [ 33.527673] (ftrace buffer empty) [ 33.531362] Kernel Offset: disabled [ 33.534969] Rebooting in 86400 seconds..