[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.551834] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.904187] random: sshd: uninitialized urandom read (32 bytes read) [ 24.242210] random: sshd: uninitialized urandom read (32 bytes read) [ 25.015502] random: sshd: uninitialized urandom read (32 bytes read) [ 25.171972] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. [ 30.705873] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.796239] WARNING: CPU: 1 PID: 4512 at include/net/sock.h:644 smc_unhash_sk+0x357/0x4b0 [ 30.804647] Kernel panic - not syncing: panic_on_warn set ... [ 30.804647] [ 30.811993] CPU: 1 PID: 4512 Comm: syz-executor777 Not tainted 4.18.0-rc1+ #107 [ 30.819422] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.828767] Call Trace: [ 30.831337] dump_stack+0x1c9/0x2b4 [ 30.834945] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.840117] panic+0x238/0x4e7 [ 30.843290] ? add_taint.cold.5+0x16/0x16 [ 30.847419] ? __warn.cold.8+0x148/0x1ba [ 30.851457] ? __warn.cold.8+0x117/0x1ba [ 30.855507] ? smc_unhash_sk+0x357/0x4b0 [ 30.859546] __warn.cold.8+0x163/0x1ba [ 30.863414] ? smc_unhash_sk+0x357/0x4b0 [ 30.867453] report_bug+0x252/0x2d0 [ 30.871064] do_error_trap+0x1fc/0x4d0 [ 30.874932] ? math_error+0x3f0/0x3f0 [ 30.878714] ? print_usage_bug+0xc0/0xc0 [ 30.882758] ? lock_acquire+0x1e4/0x540 [ 30.886715] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.891539] do_invalid_op+0x1b/0x20 [ 30.895233] invalid_op+0x14/0x20 [ 30.898666] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 30.903306] Code: 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 88 00 00 00 48 81 c4 c0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 69 d9 1b fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 43 a4 59 fa [ 30.922497] RSP: 0018:ffff8801ac8e7480 EFLAGS: 00010293 [ 30.927840] RAX: ffff8801d9b48340 RBX: ffff8801d96e1800 RCX: ffffffff875fd076 [ 30.935086] RDX: 0000000000000000 RSI: ffffffff875fd137 RDI: 0000000000000005 [ 30.942336] RBP: ffff8801ac8e7568 R08: ffff8801d9b48340 R09: ffffed003b2dc310 [ 30.949585] R10: ffffed003b2dc310 R11: ffff8801d96e1883 R12: 1ffff1003591ce94 [ 30.956846] R13: ffff8801ac8e7540 R14: ffffffff89934540 R15: ffff8801d96e1880 [ 30.964108] ? smc_unhash_sk+0x296/0x4b0 [ 30.968147] ? smc_unhash_sk+0x357/0x4b0 [ 30.972191] ? smc_rx_data_available+0x120/0x120 [ 30.976937] ? release_sock+0x1ec/0x2c0 [ 30.980890] ? __local_bh_enable_ip+0x161/0x230 [ 30.985544] ? __release_sock+0x3a0/0x3a0 [ 30.989669] ? smc_release+0x269/0x610 [ 30.993541] ? trace_hardirqs_on+0xd/0x10 [ 30.997666] ? __local_bh_enable_ip+0x161/0x230 [ 31.002322] smc_release+0x36e/0x610 [ 31.006027] __sock_release+0xd7/0x260 [ 31.009896] ? __sock_release+0x260/0x260 [ 31.014030] sock_close+0x19/0x20 [ 31.017467] __fput+0x35b/0x8b0 [ 31.020724] ? fput+0x1a0/0x1a0 [ 31.023983] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.028458] ____fput+0x15/0x20 [ 31.031717] task_work_run+0x1ec/0x2a0 [ 31.035585] ? task_work_cancel+0x250/0x250 [ 31.039891] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.045406] ? switch_task_namespaces+0xa2/0xd0 [ 31.050054] do_exit+0x1b08/0x2750 [ 31.053579] ? mm_update_next_owner+0x9a0/0x9a0 [ 31.058232] ? lock_pin_lock+0x350/0x350 [ 31.062277] ? kasan_check_read+0x11/0x20 [ 31.066402] ? rcu_is_watching+0x8c/0x150 [ 31.070531] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 31.074922] ? check_usage_backwards+0x164/0x3d0 [ 31.079667] ? print_shortest_lock_dependencies+0x80/0x80 [ 31.085190] ? unwind_get_return_address+0x61/0xa0 [ 31.090098] ? graph_lock+0x170/0x170 [ 31.093875] ? graph_lock+0x170/0x170 [ 31.097657] ? find_held_lock+0x36/0x1c0 [ 31.101704] ? lock_downgrade+0x8f0/0x8f0 [ 31.105833] ? kasan_check_read+0x11/0x20 [ 31.109958] ? do_raw_spin_unlock+0xa7/0x2f0 [ 31.114345] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.119339] ? release_sock+0x1ec/0x2c0 [ 31.123293] ? trace_hardirqs_on+0xd/0x10 [ 31.127431] ? __local_bh_enable_ip+0x161/0x230 [ 31.132085] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.136473] ? release_sock+0x1ec/0x2c0 [ 31.140423] ? __release_sock+0x3a0/0x3a0 [ 31.144553] ? __local_bh_enable_ip+0x161/0x230 [ 31.149202] ? smc_setsockopt+0x388/0x6e0 [ 31.153332] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.158847] ? __sys_setsockopt+0x257/0x3b0 [ 31.163149] do_group_exit+0x177/0x440 [ 31.167025] ? mm_fault_error+0x380/0x380 [ 31.171159] ? __ia32_sys_exit+0x50/0x50 [ 31.175199] ? do_syscall_64+0x9a/0x820 [ 31.179152] __x64_sys_exit_group+0x3e/0x50 [ 31.183454] do_syscall_64+0x1b9/0x820 [ 31.187321] ? syscall_return_slowpath+0x5e0/0x5e0 [ 31.192228] ? syscall_return_slowpath+0x31d/0x5e0 [ 31.197142] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.202490] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.207331] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.212507] RIP: 0033:0x43e8d8 [ 31.215670] Code: Bad RIP value. [ 31.219027] RSP: 002b:00007ffe99efb468 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.226722] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 31.233970] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.241227] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.248473] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 31.255724] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.263542] Dumping ftrace buffer: [ 31.267175] (ftrace buffer empty) [ 31.270860] Kernel Offset: disabled [ 31.274466] Rebooting in 86400 seconds..