[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.577653] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.926732] random: sshd: uninitialized urandom read (32 bytes read) [ 21.300502] random: sshd: uninitialized urandom read (32 bytes read) [ 21.744243] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 27.409747] urandom_read: 1 callbacks suppressed [ 27.409752] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.498570] ------------[ cut here ]------------ [ 27.503376] user requested TSC rate below hardware speed [ 27.509034] WARNING: CPU: 1 PID: 4340 at arch/x86/kvm/x86.c:1414 kvm_set_tsc_khz+0x4f1/0x540 [ 27.517620] Kernel panic - not syncing: panic_on_warn set ... [ 27.517620] [ 27.524988] CPU: 1 PID: 4340 Comm: syz-executor003 Not tainted 4.18.0-rc8-next-20180807+ #33 [ 27.533558] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.543084] Call Trace: [ 27.545774] dump_stack+0x1c9/0x2b4 [ 27.549402] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.554595] panic+0x238/0x4e7 [ 27.557779] ? add_taint.cold.5+0x16/0x16 [ 27.562020] ? __warn.cold.8+0x148/0x1ba [ 27.566157] ? __warn.cold.8+0x117/0x1ba [ 27.570333] ? kvm_set_tsc_khz+0x4f1/0x540 [ 27.574568] __warn.cold.8+0x163/0x1ba [ 27.578450] ? kvm_set_tsc_khz+0x4f1/0x540 [ 27.582684] report_bug+0x252/0x2d0 [ 27.586299] do_error_trap+0x1fc/0x4d0 [ 27.590170] ? math_error+0x3e0/0x3e0 [ 27.593959] ? vprintk_default+0x28/0x30 [ 27.598011] ? vprintk_func+0x81/0x117 [ 27.601887] ? printk+0xa7/0xcf [ 27.605161] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.609994] do_invalid_op+0x1b/0x20 [ 27.613692] invalid_op+0x14/0x20 [ 27.617222] RIP: 0010:kvm_set_tsc_khz+0x4f1/0x540 [ 27.622058] Code: c7 c7 40 1a 02 87 c6 05 77 b6 79 07 01 e8 67 6a 3b 00 0f 0b e9 ed fd ff ff e8 6b d1 70 00 48 c7 c7 e0 19 02 87 e8 4f 6a 3b 00 <0f> 0b bb ff ff ff ff e9 d0 fd ff ff 89 45 d0 e8 4b cf af 00 8b 45 [ 27.641019] RSP: 0018:ffff8801bf3c7398 EFLAGS: 00010286 [ 27.646508] RAX: 0000000000000000 RBX: 000000000023185f RCX: 0000000000000000 [ 27.653780] RDX: 0000000000000000 RSI: ffffffff8163ec91 RDI: ffff8801bf3c7088 [ 27.661046] RBP: ffff8801bf3c73d8 R08: ffff8801b0b3e400 R09: fffffbfff0ff1288 [ 27.668303] R10: fffffbfff0ff1288 R11: ffffffff87f89443 R12: ffff8801ae6e8040 [ 27.675662] R13: 00000000002315b8 R14: 000000000023185f R15: 0000000000000000 [ 27.682939] ? vprintk_func+0x81/0x117 [ 27.686961] ? kvm_set_tsc_khz+0x4f1/0x540 [ 27.691206] kvm_arch_vcpu_init+0x269/0x830 [ 27.695528] kvm_vcpu_init+0x2fb/0x420 [ 27.699425] ? vcpu_stat_get+0x310/0x310 [ 27.703489] ? kvm_vm_ioctl+0x47e/0x1d80 [ 27.707550] vmx_create_vcpu+0x14c/0x28b0 [ 27.711704] ? trace_hardirqs_off+0xd/0x10 [ 27.715931] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 27.721134] ? vmx_set_nested_state+0xea0/0xea0 [ 27.725942] ? kasan_check_write+0x14/0x20 [ 27.730272] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 27.735197] ? wait_for_completion+0x8d0/0x8d0 [ 27.739775] kvm_arch_vcpu_create+0xe5/0x220 [ 27.744220] ? kvm_arch_vcpu_free+0x90/0x90 [ 27.748549] kvm_vm_ioctl+0x488/0x1d80 [ 27.752449] ? trace_hardirqs_off+0xd/0x10 [ 27.756675] ? quarantine_put+0x10d/0x1b0 [ 27.760813] ? kvm_set_memory_region+0x50/0x50 [ 27.765384] ? __kasan_slab_free+0x131/0x170 [ 27.769782] ? trace_hardirqs_on+0xd/0x10 [ 27.773920] ? fd_install+0x4d/0x60 [ 27.777545] ? kvm_dev_ioctl+0x18a/0x1b10 [ 27.781693] ? is_bpf_text_address+0xae/0x170 [ 27.786243] ? kvm_debugfs_release+0x90/0x90 [ 27.790645] ? kasan_check_read+0x11/0x20 [ 27.794780] ? rcu_is_watching+0x8c/0x150 [ 27.798977] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 27.803644] ? is_bpf_text_address+0xd7/0x170 [ 27.808204] ? kernel_text_address+0x79/0xf0 [ 27.812672] ? __kernel_text_address+0xd/0x40 [ 27.817162] ? unwind_get_return_address+0x61/0xa0 [ 27.822082] ? __save_stack_trace+0x8d/0xf0 [ 27.826399] ? save_stack+0xa9/0xd0 [ 27.830015] ? save_stack+0x43/0xd0 [ 27.833630] ? __kasan_slab_free+0x11a/0x170 [ 27.838025] ? kasan_slab_free+0xe/0x10 [ 27.841985] ? putname+0xf2/0x130 [ 27.845433] ? do_sys_open+0x569/0x720 [ 27.849317] ? __x64_sys_openat+0x9d/0x100 [ 27.853557] ? do_syscall_64+0x1b9/0x820 [ 27.857619] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.863062] ? kasan_check_read+0x11/0x20 [ 27.867341] ? do_raw_spin_unlock+0xa7/0x2f0 [ 27.871835] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 27.876413] ? kasan_check_write+0x14/0x20 [ 27.880695] ? do_raw_spin_lock+0xc1/0x200 [ 27.884928] ? trace_hardirqs_off+0xd/0x10 [ 27.889203] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 27.894308] ? kvm_set_memory_region+0x50/0x50 [ 27.898881] do_vfs_ioctl+0x1de/0x1720 [ 27.902760] ? ioctl_preallocate+0x300/0x300 [ 27.907157] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.912688] ? __fget_light+0x2f7/0x440 [ 27.916668] ? fget_raw+0x20/0x20 [ 27.920160] ? trace_hardirqs_on+0xd/0x10 [ 27.924307] ? kmem_cache_free+0x22e/0x2d0 [ 27.929058] ? putname+0xf7/0x130 [ 27.932501] ? security_file_ioctl+0x94/0xc0 [ 27.936911] ksys_ioctl+0xa9/0xd0 [ 27.940364] __x64_sys_ioctl+0x73/0xb0 [ 27.944317] do_syscall_64+0x1b9/0x820 [ 27.948198] ? syscall_return_slowpath+0x5e0/0x5e0 [ 27.953119] ? syscall_return_slowpath+0x31d/0x5e0 [ 27.958114] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 27.963128] ? prepare_exit_to_usermode+0x291/0x3b0 [ 27.968134] ? perf_trace_sys_enter+0xb10/0xb10 [ 27.972902] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.977757] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.982938] RIP: 0033:0x440109 [ 27.986124] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 28.005104] RSP: 002b:00007ffda4f501e8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 28.012805] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440109 [ 28.020065] RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000004 [ 28.027331] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 28.034808] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401990 [ 28.042076] R13: 0000000000401a20 R14: 0000000000000000 R15: 0000000000000000 [ 28.049721] Dumping ftrace buffer: [ 28.053265] (ftrace buffer empty) [ 28.056972] Kernel Offset: disabled [ 28.060628] Rebooting in 86400 seconds..