[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.775119] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.624891] random: sshd: uninitialized urandom read (32 bytes read) [ 22.929061] random: sshd: uninitialized urandom read (32 bytes read) [ 23.361136] random: sshd: uninitialized urandom read (32 bytes read) [ 30.139034] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 35.559711] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.651692] kasan: CONFIG_KASAN_INLINE enabled [ 35.656302] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 35.663688] general protection fault: 0000 [#1] SMP KASAN [ 35.669218] CPU: 1 PID: 4363 Comm: syz-executor178 Not tainted 4.18.0-rc8-next-20180808+ #34 [ 35.677779] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.687153] RIP: 0010:__schedule+0x1061/0x1ec0 [ 35.691728] 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 43 fd 03 fb eb 9f 4c 89 e6 48 89 df e8 e6 [ 35.710619] RSP: 0018:ffff8801ad7aea80 EFLAGS: 00010806 [ 35.715990] RAX: 1bd5a00000000022 RBX: ffff8801afcf0240 RCX: 1ffff1003599188f [ 35.723247] RDX: 0000000040000000 RSI: 0000000000000000 RDI: dead000000000110 [ 35.730506] RBP: ffff8801ad7aec50 R08: ffff8801afcf0240 R09: fffff520003c2a47 [ 35.737781] R10: fffff520003c2a47 R11: ffffc90001e1523b R12: ffff8801d9858640 [ 35.745041] R13: dead000000000100 R14: dffffc0000000000 R15: ffff8801db12ca40 [ 35.752303] FS: 000000000252d880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 35.760521] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.766394] CR2: 0000000020000000 CR3: 0000000007e6a000 CR4: 00000000001426e0 [ 35.773657] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.780933] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.788191] Call Trace: [ 35.790779] ? __sched_text_start+0x8/0x8 [ 35.794921] ? generic_exec_single+0x1ea/0x5e0 [ 35.799595] ? add_nops+0x90/0x90 [ 35.803044] ? smp_call_on_cpu+0x540/0x540 [ 35.807361] ? lock_acquire+0x25f/0x540 [ 35.811332] ? check_same_owner+0x340/0x340 [ 35.815648] ? check_same_owner+0x340/0x340 [ 35.819980] ? smp_call_function_single+0x2d6/0x5c0 [ 35.824995] ? add_nops+0x90/0x90 [ 35.828447] ? arch_jump_label_transform+0x1b/0x40 [ 35.833368] preempt_schedule_common+0x22/0x60 [ 35.837943] _cond_resched+0x1d/0x30 [ 35.841651] __mutex_lock+0x13d/0x1700 [ 35.845531] ? fill_pte+0xd6/0x420 [ 35.849097] ? arch_jump_label_transform+0x1b/0x40 [ 35.854037] ? mutex_trylock+0x2b0/0x2b0 [ 35.858111] ? smp_call_function_many+0x123/0xa40 [ 35.862949] ? __native_set_fixmap+0x49/0x60 [ 35.867352] ? arch_jump_label_transform+0x3b/0x40 [ 35.872276] ? lock_downgrade+0x8f0/0x8f0 [ 35.876419] ? smp_call_function_single_async+0x340/0x340 [ 35.881949] ? __native_set_fixmap+0x60/0x60 [ 35.886352] ? trace_hardirqs_on+0xd/0x10 [ 35.890497] ? kvm_arch_vcpu_ioctl_run+0x143/0x1690 [ 35.895530] ? do_sync_core+0x18/0x20 [ 35.899324] ? trace_hardirqs_on+0xd/0x10 [ 35.903466] ? kasan_check_write+0x14/0x20 [ 35.907709] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 35.913131] ? wait_for_completion+0x8d0/0x8d0 [ 35.917695] ? kvm_arch_vcpu_ioctl_run+0x143/0x1690 [ 35.922878] ? __jump_label_transform.isra.0+0x478/0x8f0 [ 35.928314] ? modules_open+0xa0/0xa0 [ 35.932101] ? kvm_vm_release+0x42/0x50 [ 35.936063] ? get_trap_addr+0x1d0/0x1d0 [ 35.940112] ? do_group_exit+0x177/0x440 [ 35.944158] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.949759] ? jump_label_type+0x132/0x1d0 [ 35.953988] ? static_key_count+0x130/0x130 [ 35.958292] mutex_lock_nested+0x16/0x20 [ 35.962331] ? mutex_lock_nested+0x16/0x20 [ 35.966561] arch_jump_label_transform+0x1b/0x40 [ 35.971316] __jump_label_update+0x16e/0x1a0 [ 35.975709] jump_label_update+0x151/0x2e0 [ 35.980030] __static_key_slow_dec_cpuslocked+0xb8/0x210 [ 35.985535] ? static_key_disable+0x30/0x30 [ 35.989851] static_key_slow_dec+0x63/0xa0 [ 35.994071] kvm_arch_vcpu_uninit+0x18e/0x1d0 [ 35.998845] kvm_vcpu_uninit+0x44/0x90 [ 36.002720] vmx_free_vcpu+0x23a/0x300 [ 36.006596] kvm_arch_destroy_vm+0x365/0x7c0 [ 36.011116] ? check_memory_region+0x173/0x1b0 [ 36.015685] ? kvm_arch_sync_events+0x30/0x30 [ 36.020292] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 36.025960] ? mmu_notifier_unregister+0x474/0x600 [ 36.030878] ? debug_check_no_obj_freed+0x30b/0x595 [ 36.035884] ? __mmu_notifier_register+0x30/0x30 [ 36.040628] ? __free_pages+0x10a/0x190 [ 36.044690] ? free_unref_page+0x9a0/0x9a0 [ 36.048918] kvm_put_kvm+0x73f/0x1060 [ 36.052811] ? kvm_write_guest_cached+0x40/0x40 [ 36.057473] ? lock_acquire+0x1e4/0x540 [ 36.061433] ? kvm_irqfd_release+0xd1/0x120 [ 36.065736] ? lock_downgrade+0x8f0/0x8f0 [ 36.069866] ? kasan_check_write+0x14/0x20 [ 36.074080] ? do_raw_spin_lock+0xc1/0x200 [ 36.078290] ? kvm_irqfd_release+0xdd/0x120 [ 36.082695] ? kvm_put_kvm+0x1060/0x1060 [ 36.086883] kvm_vm_release+0x42/0x50 [ 36.090668] __fput+0x376/0x8a0 [ 36.093938] ? __alloc_file+0x400/0x400 [ 36.097895] ? check_same_owner+0x340/0x340 [ 36.102193] ? kasan_check_write+0x14/0x20 [ 36.106401] ? do_raw_spin_lock+0xc1/0x200 [ 36.110615] ____fput+0x15/0x20 [ 36.113874] task_work_run+0x1e8/0x2a0 [ 36.117748] ? task_work_cancel+0x240/0x240 [ 36.122162] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 36.127678] ? switch_task_namespaces+0xa2/0xd0 [ 36.132338] do_exit+0x1b25/0x2760 [ 36.135863] ? mm_update_next_owner+0x9a0/0x9a0 [ 36.140513] ? kvm_dev_ioctl+0x18a/0x1b10 [ 36.144647] ? is_bpf_text_address+0xae/0x170 [ 36.149125] ? kfree+0x15e/0x260 [ 36.152471] ? kvm_vcpu_ioctl+0x2ba/0x1300 [ 36.156878] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 36.162588] ? is_bpf_text_address+0xd7/0x170 [ 36.167166] ? kernel_text_address+0x79/0xf0 [ 36.171576] ? __kernel_text_address+0xd/0x40 [ 36.176062] ? unwind_get_return_address+0x61/0xa0 [ 36.180975] ? __save_stack_trace+0x8d/0xf0 [ 36.185276] ? save_stack+0xa9/0xd0 [ 36.188881] ? save_stack+0x43/0xd0 [ 36.192489] ? __kasan_slab_free+0x11a/0x170 [ 36.196877] ? kasan_slab_free+0xe/0x10 [ 36.200827] ? putname+0xf2/0x130 [ 36.204426] ? __x64_sys_openat+0x9d/0x100 [ 36.208705] ? do_syscall_64+0x1b9/0x820 [ 36.212751] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.218098] ? kasan_check_read+0x11/0x20 [ 36.222228] ? do_raw_spin_unlock+0xa7/0x2f0 [ 36.226621] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 36.231184] ? initcall_blacklisted+0x9a/0x1e0 [ 36.235847] ? do_raw_spin_lock+0xc1/0x200 [ 36.240065] ? trace_hardirqs_off+0xd/0x10 [ 36.244277] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 36.249366] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 36.255061] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.260576] ? do_vfs_ioctl+0x201/0x1720 [ 36.264620] ? ioctl_preallocate+0x300/0x300 [ 36.269025] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.274539] ? __fget_light+0x2f7/0x440 [ 36.278695] ? fget_raw+0x20/0x20 [ 36.282242] ? trace_hardirqs_on+0xd/0x10 [ 36.286370] ? kmem_cache_free+0x22e/0x2d0 [ 36.290584] ? putname+0xf7/0x130 [ 36.294140] do_group_exit+0x177/0x440 [ 36.298011] ? __ia32_sys_exit+0x50/0x50 [ 36.302117] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.307641] ? ksys_ioctl+0x81/0xd0 [ 36.311247] __x64_sys_exit_group+0x3e/0x50 [ 36.315548] do_syscall_64+0x1b9/0x820 [ 36.319413] ? syscall_return_slowpath+0x5e0/0x5e0 [ 36.324321] ? syscall_return_slowpath+0x31d/0x5e0 [ 36.329228] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 36.334221] ? prepare_exit_to_usermode+0x291/0x3b0 [ 36.339321] ? perf_trace_sys_enter+0xb10/0xb10 [ 36.344044] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.348944] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.354120] RIP: 0033:0x43ef48 [ 36.357416] Code: Bad RIP value. [ 36.360763] RSP: 002b:00007ffcac28c248 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 36.368450] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ef48 [ 36.375696] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 36.383053] RBP: 00000000004be808 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 36.390308] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 36.397689] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 36.404940] Modules linked in: [ 36.408110] Dumping ftrace buffer: [ 36.411670] (ftrace buffer empty) [ 36.415481] ---[ end trace 92cb16ec20098b61 ]--- [ 36.420332] RIP: 0010:__schedule+0x1061/0x1ec0 [ 36.424895] 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 43 fd 03 fb eb 9f 4c 89 e6 48 89 df e8 e6 [ 36.443889] RSP: 0018:ffff8801ad7aea80 EFLAGS: 00010806 [ 36.449235] RAX: 1bd5a00000000022 RBX: ffff8801afcf0240 RCX: 1ffff1003599188f [ 36.456487] RDX: 0000000040000000 RSI: 0000000000000000 RDI: dead000000000110 [ 36.463738] RBP: ffff8801ad7aec50 R08: ffff8801afcf0240 R09: fffff520003c2a47 [ 36.470986] R10: fffff520003c2a47 R11: ffffc90001e1523b R12: ffff8801d9858640 [ 36.478431] R13: dead000000000100 R14: dffffc0000000000 R15: ffff8801db12ca40 [ 36.485682] FS: 000000000252d880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 36.493882] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.499739] CR2: 000000000043ef1e CR3: 0000000007e6a000 CR4: 00000000001426e0 [ 36.507089] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.514343] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.521710] Kernel panic - not syncing: Fatal exception [ 37.576823] Shutting down cpus with NMI [ 37.581297] Dumping ftrace buffer: [ 37.584823] (ftrace buffer empty) [ 37.588508] Kernel Offset: disabled [ 37.592112] Rebooting in 86400 seconds..