[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.307658] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.086042] random: sshd: uninitialized urandom read (32 bytes read) [ 24.490401] random: sshd: uninitialized urandom read (32 bytes read) [ 25.256863] random: sshd: uninitialized urandom read (32 bytes read) [ 25.413958] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. [ 30.834366] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.925407] WARNING: CPU: 1 PID: 4499 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.933814] Kernel panic - not syncing: panic_on_warn set ... [ 30.933814] [ 30.941159] CPU: 1 PID: 4499 Comm: syz-executor345 Not tainted 4.17.0-rc4+ #52 [ 30.948496] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.957829] Call Trace: [ 30.960403] dump_stack+0x1b9/0x294 [ 30.964017] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.969203] ? smc_unhash_sk+0x2f0/0x4a0 [ 30.973251] panic+0x22f/0x4de [ 30.976422] ? add_taint.cold.5+0x16/0x16 [ 30.980550] ? __warn.cold.8+0x148/0x1b3 [ 30.984588] ? __warn.cold.8+0x117/0x1b3 [ 30.988629] ? smc_unhash_sk+0x345/0x4a0 [ 30.992667] __warn.cold.8+0x163/0x1b3 [ 30.996533] ? smc_unhash_sk+0x345/0x4a0 [ 31.000596] report_bug+0x252/0x2d0 [ 31.004218] do_error_trap+0x1de/0x490 [ 31.008094] ? graph_lock+0x170/0x170 [ 31.011873] ? math_error+0x420/0x420 [ 31.015656] ? lock_acquire+0x1dc/0x520 [ 31.019618] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.024447] do_invalid_op+0x1b/0x20 [ 31.028141] invalid_op+0x14/0x20 [ 31.031586] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.036232] RSP: 0018:ffff8801ae97f488 EFLAGS: 00010293 [ 31.041577] RAX: ffff8801d901c2c0 RBX: ffff8801acf4b7c0 RCX: ffffffff8740fa9e [ 31.048828] RDX: 0000000000000000 RSI: ffffffff8740fb55 RDI: 0000000000000005 [ 31.056082] RBP: ffff8801ae97f570 R08: ffff8801d901c2c0 R09: ffffed00359e9708 [ 31.063342] R10: ffffed00359e9708 R11: ffff8801acf4b843 R12: 1ffff10035d2fe95 [ 31.070590] R13: ffff8801ae97f548 R14: ffffffff8970dc60 R15: ffff8801acf4b840 [ 31.077852] ? smc_unhash_sk+0x28e/0x4a0 [ 31.081893] ? smc_unhash_sk+0x345/0x4a0 [ 31.085937] ? smc_unhash_sk+0x345/0x4a0 [ 31.089982] ? smc_rx_data_available+0x100/0x100 [ 31.094733] ? release_sock+0x1e2/0x2b0 [ 31.098688] ? __local_bh_enable_ip+0x161/0x230 [ 31.103342] ? __release_sock+0x3a0/0x3a0 [ 31.107475] ? smc_release+0x269/0x610 [ 31.111349] ? trace_hardirqs_on+0xd/0x10 [ 31.115481] ? __local_bh_enable_ip+0x161/0x230 [ 31.120135] smc_release+0x36e/0x610 [ 31.123836] sock_release+0x96/0x1b0 [ 31.127536] ? sock_alloc_file+0x4e0/0x4e0 [ 31.131764] sock_close+0x16/0x20 [ 31.135206] __fput+0x34d/0x890 [ 31.138467] ? fput+0x1a0/0x1a0 [ 31.141734] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.146223] ____fput+0x15/0x20 [ 31.149486] task_work_run+0x1e4/0x290 [ 31.153357] ? task_work_cancel+0x240/0x240 [ 31.157663] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.163184] ? switch_task_namespaces+0xa2/0xd0 [ 31.167851] do_exit+0x1aee/0x2730 [ 31.171377] ? do_raw_spin_trylock+0x151/0x1b0 [ 31.175952] ? mm_update_next_owner+0x980/0x980 [ 31.180620] ? kasan_check_write+0x14/0x20 [ 31.184856] ? do_raw_spin_lock+0xc1/0x200 [ 31.189076] ? trace_hardirqs_off+0xd/0x10 [ 31.193291] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 31.198375] ? debug_check_no_obj_freed+0x2ff/0x584 [ 31.203376] ? trace_hardirqs_off+0xd/0x10 [ 31.207591] ? quarantine_put+0xeb/0x190 [ 31.211642] ? kfree+0x111/0x260 [ 31.214988] ? ___sys_sendmsg+0x31a/0x940 [ 31.219120] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.224123] ? trace_hardirqs_on+0xd/0x10 [ 31.228254] ? ___sys_sendmsg+0x31f/0x940 [ 31.232390] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.237909] ? copy_msghdr_from_user+0x560/0x560 [ 31.242644] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 31.247376] ? graph_lock+0x170/0x170 [ 31.251156] ? graph_lock+0x170/0x170 [ 31.254937] ? find_held_lock+0x36/0x1c0 [ 31.258981] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.264496] ? __fget_light+0x2ef/0x430 [ 31.268451] ? fget_raw+0x20/0x20 [ 31.271886] ? find_held_lock+0x36/0x1c0 [ 31.275938] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.281455] ? sockfd_lookup_light+0xc5/0x160 [ 31.285932] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.291447] ? __sys_sendmsg+0x1aa/0x270 [ 31.295487] ? __ia32_sys_shutdown+0x80/0x80 [ 31.299878] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.305395] ? __do_page_fault+0x441/0xe40 [ 31.309621] do_group_exit+0x16f/0x430 [ 31.313489] ? __ia32_sys_exit+0x50/0x50 [ 31.317537] ? do_syscall_64+0x92/0x800 [ 31.321493] __x64_sys_exit_group+0x3e/0x50 [ 31.325796] do_syscall_64+0x1b1/0x800 [ 31.329664] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.334576] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.339489] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.344835] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.349662] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.354830] RIP: 0033:0x43eb48 [ 31.357998] RSP: 002b:00007ffc1ba73598 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.365698] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043eb48 [ 31.372947] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.380197] RBP: 00000000004be4e0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.387445] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 31.394694] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.402576] Dumping ftrace buffer: [ 31.406249] (ftrace buffer empty) [ 31.409950] Kernel Offset: disabled [ 31.413574] Rebooting in 86400 seconds..