[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.912011] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.628224] random: sshd: uninitialized urandom read (32 bytes read) [ 19.892626] random: sshd: uninitialized urandom read (32 bytes read) [ 20.656819] random: sshd: uninitialized urandom read (32 bytes read) [ 37.165566] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 42.708508] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 42.796413] WARNING: CPU: 1 PID: 4485 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 42.804823] Kernel panic - not syncing: panic_on_warn set ... [ 42.804823] [ 42.812184] CPU: 1 PID: 4485 Comm: syz-executor268 Not tainted 4.17.0-rc4+ #44 [ 42.819519] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.828857] Call Trace: [ 42.831437] dump_stack+0x1b9/0x294 [ 42.835045] ? dump_stack_print_info.cold.2+0x52/0x52 [ 42.840225] ? smc_unhash_sk+0x330/0x4a0 [ 42.844269] panic+0x22f/0x4de [ 42.847443] ? add_taint.cold.5+0x16/0x16 [ 42.851579] ? __warn.cold.8+0x148/0x1b3 [ 42.855617] ? __warn.cold.8+0x117/0x1b3 [ 42.859657] ? smc_unhash_sk+0x345/0x4a0 [ 42.863710] __warn.cold.8+0x163/0x1b3 [ 42.867583] ? smc_unhash_sk+0x345/0x4a0 [ 42.871623] report_bug+0x252/0x2d0 [ 42.875230] do_error_trap+0x1de/0x490 [ 42.879095] ? graph_lock+0x170/0x170 [ 42.882878] ? math_error+0x420/0x420 [ 42.886662] ? lock_acquire+0x1dc/0x520 [ 42.890620] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.895448] do_invalid_op+0x1b/0x20 [ 42.899153] invalid_op+0x14/0x20 [ 42.902587] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 42.907231] RSP: 0018:ffff8801afb3f488 EFLAGS: 00010293 [ 42.912589] RAX: ffff8801af170000 RBX: ffff8801af10f7c0 RCX: ffffffff8740565e [ 42.919852] RDX: 0000000000000000 RSI: ffffffff87405715 RDI: 0000000000000005 [ 42.927116] RBP: ffff8801afb3f570 R08: ffff8801af170000 R09: ffffed0035e21f08 [ 42.934380] R10: ffffed0035e21f08 R11: ffff8801af10f843 R12: 1ffff10035f67e95 [ 42.941629] R13: ffff8801afb3f548 R14: ffffffff8970cba0 R15: ffff8801af10f840 [ 42.948895] ? smc_unhash_sk+0x28e/0x4a0 [ 42.952932] ? smc_unhash_sk+0x345/0x4a0 [ 42.956973] ? smc_unhash_sk+0x345/0x4a0 [ 42.961017] ? smc_rx_data_available+0x100/0x100 [ 42.965753] ? release_sock+0x1e2/0x2b0 [ 42.969714] ? __local_bh_enable_ip+0x161/0x230 [ 42.974364] ? __release_sock+0x3a0/0x3a0 [ 42.978492] ? smc_release+0x269/0x610 [ 42.982363] ? trace_hardirqs_on+0xd/0x10 [ 42.986492] ? __local_bh_enable_ip+0x161/0x230 [ 42.991144] smc_release+0x36e/0x610 [ 42.994840] sock_release+0x96/0x1b0 [ 42.998535] ? sock_alloc_file+0x4e0/0x4e0 [ 43.002749] sock_close+0x16/0x20 [ 43.006182] __fput+0x34d/0x890 [ 43.009456] ? fput+0x1a0/0x1a0 [ 43.012741] ? _raw_spin_unlock_irq+0x27/0x70 [ 43.017244] ____fput+0x15/0x20 [ 43.020520] task_work_run+0x1e4/0x290 [ 43.024389] ? task_work_cancel+0x240/0x240 [ 43.028692] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 43.034207] ? switch_task_namespaces+0xa2/0xd0 [ 43.038868] do_exit+0x1aee/0x2730 [ 43.042389] ? mm_update_next_owner+0x980/0x980 [ 43.047061] ? find_held_lock+0x36/0x1c0 [ 43.051103] ? lock_downgrade+0x8e0/0x8e0 [ 43.055228] ? lock_downgrade+0x8e0/0x8e0 [ 43.059360] ? kasan_check_read+0x11/0x20 [ 43.063500] ? do_raw_spin_unlock+0x9e/0x2e0 [ 43.067890] ? __local_bh_enable_ip+0x161/0x230 [ 43.072537] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 43.077532] ? release_sock+0x1e2/0x2b0 [ 43.081485] ? trace_hardirqs_on+0xd/0x10 [ 43.085617] ? __local_bh_enable_ip+0x161/0x230 [ 43.090266] ? _raw_spin_unlock_bh+0x30/0x40 [ 43.094656] ? release_sock+0x1e2/0x2b0 [ 43.098609] ? __release_sock+0x3a0/0x3a0 [ 43.102736] ? __local_bh_enable_ip+0x161/0x230 [ 43.107386] ? lock_sock_nested+0xe7/0x120 [ 43.111601] ? smc_sendmsg+0x2d5/0x370 [ 43.115474] ? smc_sendpage+0x1a0/0x1a0 [ 43.119432] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.124947] ? sock_sendmsg+0x5a/0x120 [ 43.128826] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.134340] ? __sys_sendto+0x475/0x670 [ 43.138318] ? __ia32_sys_getpeername+0xb0/0xb0 [ 43.143004] ? __fd_install+0x2de/0x880 [ 43.146973] ? get_unused_fd_flags+0x190/0x190 [ 43.151540] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.157056] ? alloc_file+0x44/0x3e0 [ 43.160752] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 43.166271] ? sock_alloc_file+0x2a4/0x4e0 [ 43.170488] ? __alloc_fd+0x700/0x700 [ 43.174269] ? fd_install+0x4d/0x60 [ 43.177897] do_group_exit+0x16f/0x430 [ 43.181796] ? __ia32_sys_exit+0x50/0x50 [ 43.185869] ? do_syscall_64+0x92/0x800 [ 43.189852] __x64_sys_exit_group+0x3e/0x50 [ 43.194191] do_syscall_64+0x1b1/0x800 [ 43.198063] ? syscall_return_slowpath+0x5c0/0x5c0 [ 43.202976] ? syscall_return_slowpath+0x30f/0x5c0 [ 43.207889] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 43.213234] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.218062] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.223232] RIP: 0033:0x43e8b8 [ 43.226401] RSP: 002b:00007ffd2b25c528 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 43.234086] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 43.241345] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 43.248591] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 43.255838] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 43.263085] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 43.270830] Dumping ftrace buffer: [ 43.274447] (ftrace buffer empty) [ 43.278137] Kernel Offset: disabled [ 43.281746] Rebooting in 86400 seconds..