[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.606159] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.901971] random: sshd: uninitialized urandom read (32 bytes read) [ 24.292860] random: sshd: uninitialized urandom read (32 bytes read) [ 25.095629] random: sshd: uninitialized urandom read (32 bytes read) [ 25.255803] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. [ 30.718177] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.812094] WARNING: CPU: 0 PID: 4502 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.820490] Kernel panic - not syncing: panic_on_warn set ... [ 30.820490] [ 30.827857] CPU: 0 PID: 4502 Comm: syz-executor009 Not tainted 4.17.0-rc7+ #79 [ 30.835203] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.844623] Call Trace: [ 30.847199] dump_stack+0x1b9/0x294 [ 30.850811] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.855990] ? smc_unhash_sk+0x300/0x4a0 [ 30.860034] panic+0x22f/0x4de [ 30.863210] ? add_taint.cold.5+0x16/0x16 [ 30.867341] ? __warn.cold.8+0x148/0x1b3 [ 30.871381] ? __warn.cold.8+0x117/0x1b3 [ 30.875423] ? smc_unhash_sk+0x345/0x4a0 [ 30.879485] __warn.cold.8+0x163/0x1b3 [ 30.883353] ? smc_unhash_sk+0x345/0x4a0 [ 30.887406] report_bug+0x252/0x2d0 [ 30.891018] do_error_trap+0x1de/0x490 [ 30.894883] ? graph_lock+0x170/0x170 [ 30.898667] ? math_error+0x420/0x420 [ 30.902451] ? lock_acquire+0x1dc/0x520 [ 30.906418] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.911242] do_invalid_op+0x1b/0x20 [ 30.914937] invalid_op+0x14/0x20 [ 30.918371] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.923014] RSP: 0018:ffff8801aca6f488 EFLAGS: 00010293 [ 30.928359] RAX: ffff8801ac9c04c0 RBX: ffff8801ace707c0 RCX: ffffffff8744478e [ 30.935613] RDX: 0000000000000000 RSI: ffffffff87444845 RDI: 0000000000000005 [ 30.942863] RBP: ffff8801aca6f570 R08: ffff8801ac9c04c0 R09: ffffed00359ce108 [ 30.950112] R10: ffffed00359ce108 R11: ffff8801ace70843 R12: 1ffff1003594de95 [ 30.957370] R13: ffff8801aca6f548 R14: ffffffff89710ea0 R15: ffff8801ace70840 [ 30.964635] ? smc_unhash_sk+0x28e/0x4a0 [ 30.968684] ? smc_unhash_sk+0x345/0x4a0 [ 30.972728] ? smc_unhash_sk+0x345/0x4a0 [ 30.976781] ? smc_rx_data_available+0x100/0x100 [ 30.981530] ? release_sock+0x1e2/0x2b0 [ 30.985486] ? __local_bh_enable_ip+0x161/0x230 [ 30.990135] ? __release_sock+0x3a0/0x3a0 [ 30.994260] ? smc_release+0x269/0x610 [ 30.998138] ? trace_hardirqs_on+0xd/0x10 [ 31.002266] ? __local_bh_enable_ip+0x161/0x230 [ 31.006916] smc_release+0x36e/0x610 [ 31.010614] sock_release+0x96/0x1b0 [ 31.014307] ? sock_alloc_file+0x4e0/0x4e0 [ 31.018522] sock_close+0x16/0x20 [ 31.021958] __fput+0x34d/0x890 [ 31.025229] ? fput+0x1a0/0x1a0 [ 31.028488] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.032970] ____fput+0x15/0x20 [ 31.036230] task_work_run+0x1e4/0x290 [ 31.040098] ? task_work_cancel+0x240/0x240 [ 31.044403] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.049926] ? switch_task_namespaces+0xa2/0xd0 [ 31.054586] do_exit+0x1aee/0x2730 [ 31.058116] ? mm_update_next_owner+0x980/0x980 [ 31.062768] ? kasan_check_read+0x11/0x20 [ 31.066897] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.071288] ? __local_bh_enable_ip+0x161/0x230 [ 31.075937] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.080933] ? release_sock+0x1e2/0x2b0 [ 31.084886] ? trace_hardirqs_on+0xd/0x10 [ 31.089032] ? __local_bh_enable_ip+0x161/0x230 [ 31.093692] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.098091] ? kasan_check_read+0x11/0x20 [ 31.102220] ? rcu_is_watching+0x85/0x140 [ 31.106346] ? rcu_pm_notify+0xc0/0xc0 [ 31.110217] ? ___sys_sendmsg+0x31a/0x940 [ 31.114344] ? kfree+0x1e9/0x260 [ 31.117691] ? ___sys_sendmsg+0x31f/0x940 [ 31.121820] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.127348] ? __handle_mm_fault+0x93a/0x4310 [ 31.131826] ? copy_msghdr_from_user+0x560/0x560 [ 31.136562] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 31.141305] ? graph_lock+0x170/0x170 [ 31.145097] ? find_held_lock+0x36/0x1c0 [ 31.149150] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.154665] ? __fget_light+0x2ef/0x430 [ 31.158621] ? fget_raw+0x20/0x20 [ 31.162054] ? find_held_lock+0x36/0x1c0 [ 31.166098] ? lock_downgrade+0x8e0/0x8e0 [ 31.170242] ? handle_mm_fault+0x8c0/0xc70 [ 31.174468] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.179985] ? sockfd_lookup_light+0xc5/0x160 [ 31.184462] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.189979] ? __sys_sendmsg+0x1aa/0x270 [ 31.194019] ? __ia32_sys_shutdown+0x80/0x80 [ 31.198411] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.203928] ? __do_page_fault+0x441/0xe40 [ 31.208147] do_group_exit+0x16f/0x430 [ 31.212017] ? __ia32_sys_exit+0x50/0x50 [ 31.216058] ? do_syscall_64+0x92/0x800 [ 31.220011] __x64_sys_exit_group+0x3e/0x50 [ 31.224313] do_syscall_64+0x1b1/0x800 [ 31.228179] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.233001] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.237917] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.242829] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.248176] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.253003] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.258177] RIP: 0033:0x43ea38 [ 31.261354] RSP: 002b:00007ffd7bcbb0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.269047] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea38 [ 31.276314] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.283562] RBP: 00000000004be3e0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.290811] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 31.298070] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.305945] Dumping ftrace buffer: [ 31.309598] (ftrace buffer empty) [ 31.313292] Kernel Offset: disabled [ 31.316900] Rebooting in 86400 seconds..