[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.615201] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.898792] random: sshd: uninitialized urandom read (32 bytes read) [ 23.325941] random: sshd: uninitialized urandom read (32 bytes read) [ 24.109106] random: sshd: uninitialized urandom read (32 bytes read) [ 24.274078] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.36' (ECDSA) to the list of known hosts. [ 29.723088] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.827656] WARNING: CPU: 0 PID: 4515 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.836091] Kernel panic - not syncing: panic_on_warn set ... [ 29.836091] [ 29.843455] CPU: 0 PID: 4515 Comm: syz-executor404 Not tainted 4.17.0-rc4+ #50 [ 29.850804] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.860382] Call Trace: [ 29.862974] dump_stack+0x1b9/0x294 [ 29.866591] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.871777] ? smc_unhash_sk+0x2f0/0x4a0 [ 29.875828] panic+0x22f/0x4de [ 29.879007] ? add_taint.cold.5+0x16/0x16 [ 29.883151] ? __warn.cold.8+0x148/0x1b3 [ 29.887203] ? __warn.cold.8+0x117/0x1b3 [ 29.891257] ? smc_unhash_sk+0x345/0x4a0 [ 29.895309] __warn.cold.8+0x163/0x1b3 [ 29.899193] ? smc_unhash_sk+0x345/0x4a0 [ 29.903271] report_bug+0x252/0x2d0 [ 29.906897] do_error_trap+0x1de/0x490 [ 29.910782] ? graph_lock+0x170/0x170 [ 29.914572] ? math_error+0x420/0x420 [ 29.918368] ? lock_acquire+0x1dc/0x520 [ 29.922340] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.927186] do_invalid_op+0x1b/0x20 [ 29.930908] invalid_op+0x14/0x20 [ 29.934369] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.939031] RSP: 0018:ffff8801d90df488 EFLAGS: 00010293 [ 29.944389] RAX: ffff8801acc56740 RBX: ffff8801ace4e7c0 RCX: ffffffff8740fa9e [ 29.951645] RDX: 0000000000000000 RSI: ffffffff8740fb55 RDI: 0000000000000005 [ 29.958911] RBP: ffff8801d90df570 R08: ffff8801acc56740 R09: ffffed00359c9d08 [ 29.966176] R10: ffffed00359c9d08 R11: ffff8801ace4e843 R12: 1ffff1003b21be95 [ 29.973444] R13: ffff8801d90df548 R14: ffffffff8970dc60 R15: ffff8801ace4e840 [ 29.980730] ? smc_unhash_sk+0x28e/0x4a0 [ 29.984788] ? smc_unhash_sk+0x345/0x4a0 [ 29.988849] ? smc_unhash_sk+0x345/0x4a0 [ 29.992894] ? smc_rx_data_available+0x100/0x100 [ 29.997644] ? release_sock+0x1e2/0x2b0 [ 30.001606] ? __local_bh_enable_ip+0x161/0x230 [ 30.006270] ? __release_sock+0x3a0/0x3a0 [ 30.010411] ? smc_release+0x269/0x610 [ 30.014286] ? trace_hardirqs_on+0xd/0x10 [ 30.018422] ? __local_bh_enable_ip+0x161/0x230 [ 30.023088] smc_release+0x36e/0x610 [ 30.026807] sock_release+0x96/0x1b0 [ 30.030526] ? sock_alloc_file+0x4e0/0x4e0 [ 30.034770] sock_close+0x16/0x20 [ 30.038325] __fput+0x34d/0x890 [ 30.041601] ? fput+0x1a0/0x1a0 [ 30.044882] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.049381] ____fput+0x15/0x20 [ 30.052650] task_work_run+0x1e4/0x290 [ 30.056531] ? task_work_cancel+0x240/0x240 [ 30.060863] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.066394] ? switch_task_namespaces+0xa2/0xd0 [ 30.071069] do_exit+0x1aee/0x2730 [ 30.074608] ? mm_update_next_owner+0x980/0x980 [ 30.083186] ? find_held_lock+0x36/0x1c0 [ 30.087259] ? lock_downgrade+0x8e0/0x8e0 [ 30.091405] ? lock_downgrade+0x8e0/0x8e0 [ 30.095550] ? kasan_check_read+0x11/0x20 [ 30.099695] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.104101] ? __local_bh_enable_ip+0x161/0x230 [ 30.108775] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.113792] ? release_sock+0x1e2/0x2b0 [ 30.117766] ? trace_hardirqs_on+0xd/0x10 [ 30.121902] ? __local_bh_enable_ip+0x161/0x230 [ 30.126581] ? _raw_spin_unlock_bh+0x30/0x40 [ 30.130990] ? release_sock+0x1e2/0x2b0 [ 30.134966] ? __release_sock+0x3a0/0x3a0 [ 30.139109] ? __local_bh_enable_ip+0x161/0x230 [ 30.143791] ? lock_sock_nested+0xe7/0x120 [ 30.148029] ? smc_sendmsg+0x2d5/0x370 [ 30.151919] ? smc_sendpage+0x1a0/0x1a0 [ 30.155901] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.161450] ? sock_sendmsg+0x5a/0x120 [ 30.165341] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.170877] ? __sys_sendto+0x475/0x670 [ 30.174841] ? __ia32_sys_getpeername+0xb0/0xb0 [ 30.179503] ? lock_downgrade+0x8e0/0x8e0 [ 30.183639] ? handle_mm_fault+0x8c0/0xc70 [ 30.187863] ? handle_mm_fault+0x55a/0xc70 [ 30.192091] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.197626] do_group_exit+0x16f/0x430 [ 30.201509] ? __ia32_sys_exit+0x50/0x50 [ 30.205569] ? do_syscall_64+0x92/0x800 [ 30.209547] __x64_sys_exit_group+0x3e/0x50 [ 30.213869] do_syscall_64+0x1b1/0x800 [ 30.217753] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.222672] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.227607] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.232987] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.237831] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.243019] RIP: 0033:0x43e8e8 [ 30.246203] RSP: 002b:00007ffea2cb5688 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.253901] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8e8 [ 30.261169] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.268429] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.275696] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 30.282958] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.290972] Dumping ftrace buffer: [ 30.294670] (ftrace buffer empty) [ 30.298379] Kernel Offset: disabled [ 30.301996] Rebooting in 86400 seconds..