[....] 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[ 17.863422] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.108664] random: sshd: uninitialized urandom read (32 bytes read) [ 24.293564] random: sshd: uninitialized urandom read (32 bytes read) [ 24.737066] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 30.402113] urandom_read: 1 callbacks suppressed [ 30.402119] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.495120] kasan: CONFIG_KASAN_INLINE enabled [ 30.499708] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 30.507046] general protection fault: 0000 [#1] SMP KASAN [ 30.512561] CPU: 1 PID: 4345 Comm: syz-executor659 Not tainted 4.18.0-rc8-next-20180806+ #32 [ 30.521112] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.530453] RIP: 0010:__schedule+0x1061/0x1ec0 [ 30.535015] Code: 4c 89 e8 48 c1 e8 03 42 80 3c 30 00 0f 85 ea 08 00 00 4d 8b 6d 00 4d 85 ed 0f 84 6b f6 ff ff 49 8d 7d 10 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 74 a6 e8 93 26 04 fb eb 9f 4c 89 e6 48 89 df e8 46 [ 30.553912] RSP: 0018:ffff8801ac05ea80 EFLAGS: 00010806 [ 30.559257] RAX: 1bd5a00000000022 RBX: ffff8801af7f83c0 RCX: 1ffff1003731888f [ 30.566602] RDX: 0000000040000000 RSI: 0000000000000000 RDI: dead000000000110 [ 30.573870] RBP: ffff8801ac05ec50 R08: ffff8801af7f83c0 R09: fffff520003c4a47 [ 30.581130] R10: fffff520003c4a47 R11: ffffc90001e2523b R12: ffff8801d9ee8280 [ 30.588379] R13: dead000000000100 R14: dffffc0000000000 R15: ffff8801db12ca40 [ 30.595802] FS: 00000000023af880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 30.604011] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.610048] CR2: 00007f6c7cdd3000 CR3: 0000000007e6a000 CR4: 00000000001426e0 [ 30.617298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.624548] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.631802] Call Trace: [ 30.634369] ? trace_hardirqs_on+0x10/0x10 [ 30.638589] ? __sched_text_start+0x8/0x8 [ 30.642722] ? generic_exec_single+0x1ea/0x5e0 [ 30.647284] ? add_nops+0x90/0x90 [ 30.650713] ? smp_call_on_cpu+0x540/0x540 [ 30.654925] ? retint_kernel+0x10/0x10 [ 30.658791] ? smp_call_function_single+0x43c/0x5c0 [ 30.663790] ? check_same_owner+0x340/0x340 [ 30.668094] ? smp_call_function_single+0x2d6/0x5c0 [ 30.673101] ? add_nops+0x90/0x90 [ 30.676535] ? arch_jump_label_transform+0x1b/0x40 [ 30.681446] preempt_schedule_common+0x22/0x60 [ 30.686011] _cond_resched+0x1d/0x30 [ 30.689703] __mutex_lock+0x13d/0x1700 [ 30.693572] ? fill_pte+0xd6/0x420 [ 30.697090] ? arch_jump_label_transform+0x1b/0x40 [ 30.701999] ? mutex_trylock+0x2b0/0x2b0 [ 30.706036] ? smp_call_function_many+0x123/0xa40 [ 30.710861] ? __native_set_fixmap+0x49/0x60 [ 30.715248] ? arch_jump_label_transform+0x3b/0x40 [ 30.720162] ? lock_downgrade+0x8f0/0x8f0 [ 30.724289] ? smp_call_function_single_async+0x340/0x340 [ 30.729891] ? __native_set_fixmap+0x60/0x60 [ 30.734277] ? trace_hardirqs_on+0xd/0x10 [ 30.738413] ? kvm_pmu_deliver_pmi+0xd/0xa0 [ 30.742721] ? do_sync_core+0x18/0x20 [ 30.746499] ? trace_hardirqs_on+0xd/0x10 [ 30.750626] ? kasan_check_write+0x14/0x20 [ 30.754841] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 30.759751] ? wait_for_completion+0x8d0/0x8d0 [ 30.764316] ? kvm_pmu_deliver_pmi+0xd/0xa0 [ 30.768621] ? __jump_label_transform.isra.0+0x478/0x8f0 [ 30.774052] ? modules_open+0xa0/0xa0 [ 30.777833] ? kvm_vm_release+0x42/0x50 [ 30.781783] ? get_trap_addr+0x1d0/0x1d0 [ 30.785840] ? do_group_exit+0x177/0x440 [ 30.789884] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.795400] ? jump_label_type+0x132/0x1d0 [ 30.799622] ? static_key_count+0x130/0x130 [ 30.803928] mutex_lock_nested+0x16/0x20 [ 30.807979] ? mutex_lock_nested+0x16/0x20 [ 30.812197] arch_jump_label_transform+0x1b/0x40 [ 30.816943] __jump_label_update+0x16e/0x1a0 [ 30.821330] jump_label_update+0x151/0x2e0 [ 30.825544] __static_key_slow_dec_cpuslocked+0xb8/0x210 [ 30.830987] ? static_key_disable+0x30/0x30 [ 30.835290] static_key_slow_dec+0x63/0xa0 [ 30.839501] kvm_arch_vcpu_uninit+0x18e/0x1d0 [ 30.843972] kvm_vcpu_uninit+0x44/0x90 [ 30.847834] vmx_free_vcpu+0x23a/0x300 [ 30.851716] kvm_arch_destroy_vm+0x365/0x7c0 [ 30.856104] ? check_memory_region+0x173/0x1b0 [ 30.860661] ? kvm_arch_sync_events+0x30/0x30 [ 30.865136] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.870653] ? mmu_notifier_unregister+0x474/0x600 [ 30.875563] ? debug_check_no_obj_freed+0x30b/0x595 [ 30.880566] ? __mmu_notifier_register+0x30/0x30 [ 30.885313] ? __free_pages+0x10a/0x190 [ 30.889266] ? free_unref_page+0x9a0/0x9a0 [ 30.893481] kvm_put_kvm+0x73f/0x1060 [ 30.897275] ? kvm_write_guest_cached+0x40/0x40 [ 30.901924] ? lock_acquire+0x1e4/0x540 [ 30.905877] ? kvm_irqfd_release+0xd1/0x120 [ 30.910174] ? lock_downgrade+0x8f0/0x8f0 [ 30.914302] ? kasan_check_write+0x14/0x20 [ 30.918513] ? do_raw_spin_lock+0xc1/0x200 [ 30.922727] ? kvm_irqfd_release+0xdd/0x120 [ 30.927025] ? kvm_put_kvm+0x1060/0x1060 [ 30.931064] kvm_vm_release+0x42/0x50 [ 30.934843] __fput+0x376/0x8a0 [ 30.938103] ? __alloc_file+0x400/0x400 [ 30.942062] ? check_same_owner+0x340/0x340 [ 30.946360] ? kasan_check_write+0x14/0x20 [ 30.950570] ? do_raw_spin_lock+0xc1/0x200 [ 30.954782] ____fput+0x15/0x20 [ 30.958038] task_work_run+0x1e8/0x2a0 [ 30.961913] ? task_work_cancel+0x240/0x240 [ 30.966224] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.971739] ? switch_task_namespaces+0xa2/0xd0 [ 30.976382] do_exit+0x1b25/0x2760 [ 30.979900] ? mm_update_next_owner+0x9a0/0x9a0 [ 30.984550] ? kfree+0x15e/0x260 [ 30.987895] ? kvm_vcpu_ioctl+0x2ba/0x1300 [ 30.992114] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 30.997815] ? is_bpf_text_address+0xd7/0x170 [ 31.002291] ? kernel_text_address+0x79/0xf0 [ 31.006681] ? __kernel_text_address+0xd/0x40 [ 31.011160] ? unwind_get_return_address+0x61/0xa0 [ 31.016074] ? __save_stack_trace+0x8d/0xf0 [ 31.020380] ? save_stack+0xa9/0xd0 [ 31.023988] ? save_stack+0x43/0xd0 [ 31.027595] ? __kasan_slab_free+0x11a/0x170 [ 31.031983] ? kasan_slab_free+0xe/0x10 [ 31.035943] ? putname+0xf2/0x130 [ 31.039376] ? __x64_sys_openat+0x9d/0x100 [ 31.043587] ? do_syscall_64+0x1b9/0x820 [ 31.047628] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.052970] ? kasan_check_read+0x11/0x20 [ 31.057094] ? do_raw_spin_unlock+0xa7/0x2f0 [ 31.061478] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 31.066040] ? initcall_blacklisted+0x9a/0x1e0 [ 31.070607] ? do_raw_spin_lock+0xc1/0x200 [ 31.074821] ? trace_hardirqs_off+0xd/0x10 [ 31.079042] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 31.084126] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 31.089816] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.095332] ? do_vfs_ioctl+0x201/0x1720 [ 31.099374] ? ioctl_preallocate+0x300/0x300 [ 31.103764] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.109281] ? __fget_light+0x2f7/0x440 [ 31.113233] ? fget_raw+0x20/0x20 [ 31.116662] ? trace_hardirqs_on+0xd/0x10 [ 31.120792] ? kmem_cache_free+0x22e/0x2d0 [ 31.125012] ? putname+0xf7/0x130 [ 31.128449] do_group_exit+0x177/0x440 [ 31.132321] ? __ia32_sys_exit+0x50/0x50 [ 31.136370] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.141888] ? ksys_ioctl+0x81/0xd0 [ 31.145510] __x64_sys_exit_group+0x3e/0x50 [ 31.149817] do_syscall_64+0x1b9/0x820 [ 31.153686] ? syscall_slow_exit_work+0x500/0x500 [ 31.158514] ? syscall_return_slowpath+0x5e0/0x5e0 [ 31.163427] ? syscall_return_slowpath+0x31d/0x5e0 [ 31.168359] ? prepare_exit_to_usermode+0x291/0x3b0 [ 31.173361] ? perf_trace_sys_enter+0xb10/0xb10 [ 31.178007] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.182850] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.188015] RIP: 0033:0x43ed58 [ 31.191190] Code: Bad RIP value. [ 31.194531] RSP: 002b:00007ffcc3a21518 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.202216] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed58 [ 31.209465] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.216713] RBP: 00000000004be608 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.223960] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 31.231207] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 31.238465] Modules linked in: [ 31.241639] Dumping ftrace buffer: [ 31.245163] (ftrace buffer empty) [ 31.248884] ---[ end trace 23164517240acd85 ]--- [ 31.253634] RIP: 0010:__schedule+0x1061/0x1ec0 [ 31.258196] Code: 4c 89 e8 48 c1 e8 03 42 80 3c 30 00 0f 85 ea 08 00 00 4d 8b 6d 00 4d 85 ed 0f 84 6b f6 ff ff 49 8d 7d 10 48 89 f8 48 c1 e8 03 <42> 80 3c 30 00 74 a6 e8 93 26 04 fb eb 9f 4c 89 e6 48 89 df e8 46 [ 31.277087] RSP: 0018:ffff8801ac05ea80 EFLAGS: 00010806 [ 31.282433] RAX: 1bd5a00000000022 RBX: ffff8801af7f83c0 RCX: 1ffff1003731888f [ 31.289727] RDX: 0000000040000000 RSI: 0000000000000000 RDI: dead000000000110 [ 31.296976] RBP: ffff8801ac05ec50 R08: ffff8801af7f83c0 R09: fffff520003c4a47 [ 31.304226] R10: fffff520003c4a47 R11: ffffc90001e2523b R12: ffff8801d9ee8280 [ 31.311475] R13: dead000000000100 R14: dffffc0000000000 R15: ffff8801db12ca40 [ 31.318723] FS: 00000000023af880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 31.326930] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.332794] CR2: 000000000043ed2e CR3: 0000000007e6a000 CR4: 00000000001426e0 [ 31.340044] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.347291] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.354540] Kernel panic - not syncing: Fatal exception [ 32.407483] Shutting down cpus with NMI [ 32.411770] Dumping ftrace buffer: [ 32.415287] (ftrace buffer empty) [ 32.418975] Kernel Offset: disabled [ 32.422580] Rebooting in 86400 seconds..