[....] 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[ 18.723507] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 19.740266] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.028231] random: sshd: uninitialized urandom read (32 bytes read) [ 20.450873] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.200' (ECDSA) to the list of known hosts. [ 26.019806] urandom_read: 1 callbacks suppressed [ 26.019811] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.130448] kasan: CONFIG_KASAN_INLINE enabled [ 26.135058] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.142418] general protection fault: 0000 [#1] SMP KASAN [ 26.147958] CPU: 1 PID: 4368 Comm: syz-executor800 Not tainted 4.18.0-rc8-next-20180808+ #34 [ 26.156527] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.165900] RIP: 0010:__schedule+0x1061/0x1ec0 [ 26.170486] 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 [ 26.189392] RSP: 0018:ffff8801aceb6a80 EFLAGS: 00010806 [ 26.194786] RAX: 1bd5a00000000022 RBX: ffff8801acc12580 RCX: 1ffff1003594388f [ 26.202047] RDX: 0000000040000000 RSI: 0000000000000000 RDI: dead000000000110 [ 26.209315] RBP: ffff8801aceb6c50 R08: ffff8801acc12580 R09: fffff520003c2a47 [ 26.216591] R10: fffff520003c2a47 R11: ffffc90001e1523b R12: ffff8801ca592240 [ 26.223861] R13: dead000000000100 R14: dffffc0000000000 R15: ffff8801db12ca40 [ 26.231131] FS: 0000000000e39880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 26.239354] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.245235] CR2: 00007fb90d267000 CR3: 00000001cab35000 CR4: 00000000001426e0 [ 26.252511] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.259788] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.267054] Call Trace: [ 26.269647] ? trace_hardirqs_on+0x10/0x10 [ 26.273887] ? __sched_text_start+0x8/0x8 [ 26.278038] ? retint_kernel+0x10/0x10 [ 26.281938] ? smp_call_function_single+0x43c/0x5c0 [ 26.286957] ? smp_call_function_single+0x3eb/0x5c0 [ 26.291974] ? check_same_owner+0x340/0x340 [ 26.296292] ? smp_call_function_single+0x2d6/0x5c0 [ 26.301306] ? add_nops+0x90/0x90 [ 26.304765] ? arch_jump_label_transform+0x1b/0x40 [ 26.309693] preempt_schedule_common+0x22/0x60 [ 26.314271] _cond_resched+0x1d/0x30 [ 26.317982] __mutex_lock+0x13d/0x1700 [ 26.321871] ? fill_pte+0xd6/0x420 [ 26.325410] ? arch_jump_label_transform+0x1b/0x40 [ 26.330349] ? mutex_trylock+0x2b0/0x2b0 [ 26.334413] ? smp_call_function_many+0x123/0xa40 [ 26.339260] ? __native_set_fixmap+0x49/0x60 [ 26.343669] ? arch_jump_label_transform+0x3b/0x40 [ 26.348597] ? lock_downgrade+0x8f0/0x8f0 [ 26.352747] ? smp_call_function_single_async+0x340/0x340 [ 26.358297] ? __native_set_fixmap+0x60/0x60 [ 26.362703] ? trace_hardirqs_on+0xd/0x10 [ 26.366850] ? kvm_cpu_has_injectable_intr+0x11/0x1f0 [ 26.372038] ? do_sync_core+0x18/0x20 [ 26.375834] ? trace_hardirqs_on+0xd/0x10 [ 26.379984] ? kasan_check_write+0x14/0x20 [ 26.384218] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 26.389151] ? wait_for_completion+0x8d0/0x8d0 [ 26.393739] ? kvm_cpu_has_injectable_intr+0x11/0x1f0 [ 26.398937] ? __jump_label_transform.isra.0+0x478/0x8f0 [ 26.404394] ? modules_open+0xa0/0xa0 [ 26.408196] ? kvm_vm_release+0x42/0x50 [ 26.412173] ? get_trap_addr+0x1d0/0x1d0 [ 26.416232] ? do_group_exit+0x177/0x440 [ 26.420305] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.425845] ? jump_label_type+0x132/0x1d0 [ 26.430076] ? static_key_count+0x130/0x130 [ 26.434489] mutex_lock_nested+0x16/0x20 [ 26.438545] ? mutex_lock_nested+0x16/0x20 [ 26.442786] arch_jump_label_transform+0x1b/0x40 [ 26.447542] __jump_label_update+0x16e/0x1a0 [ 26.451953] jump_label_update+0x151/0x2e0 [ 26.456191] __static_key_slow_dec_cpuslocked+0xb8/0x210 [ 26.461645] ? static_key_disable+0x30/0x30 [ 26.465971] static_key_slow_dec+0x63/0xa0 [ 26.470209] kvm_arch_vcpu_uninit+0x18e/0x1d0 [ 26.474712] kvm_vcpu_uninit+0x44/0x90 [ 26.478602] vmx_free_vcpu+0x23a/0x300 [ 26.482493] kvm_arch_destroy_vm+0x365/0x7c0 [ 26.486907] ? check_memory_region+0x173/0x1b0 [ 26.491488] ? kvm_arch_sync_events+0x30/0x30 [ 26.495994] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 26.501540] ? mmu_notifier_unregister+0x474/0x600 [ 26.506474] ? debug_check_no_obj_freed+0x30b/0x595 [ 26.511496] ? __mmu_notifier_register+0x30/0x30 [ 26.516255] ? __free_pages+0x10a/0x190 [ 26.520232] ? free_unref_page+0x9a0/0x9a0 [ 26.524481] kvm_put_kvm+0x73f/0x1060 [ 26.528339] ? kvm_write_guest_cached+0x40/0x40 [ 26.533006] ? lock_acquire+0x1e4/0x540 [ 26.536978] ? kvm_irqfd_release+0xd1/0x120 [ 26.541299] ? lock_downgrade+0x8f0/0x8f0 [ 26.545454] ? kasan_check_write+0x14/0x20 [ 26.549684] ? do_raw_spin_lock+0xc1/0x200 [ 26.554022] ? kvm_irqfd_release+0xdd/0x120 [ 26.558341] ? kvm_put_kvm+0x1060/0x1060 [ 26.562396] kvm_vm_release+0x42/0x50 [ 26.566203] __fput+0x376/0x8a0 [ 26.569493] ? __alloc_file+0x400/0x400 [ 26.573470] ? check_same_owner+0x340/0x340 [ 26.577791] ? kasan_check_write+0x14/0x20 [ 26.582025] ? do_raw_spin_lock+0xc1/0x200 [ 26.586260] ____fput+0x15/0x20 [ 26.589537] task_work_run+0x1e8/0x2a0 [ 26.593425] ? task_work_cancel+0x240/0x240 [ 26.597745] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 26.603306] ? switch_task_namespaces+0xa2/0xd0 [ 26.607975] do_exit+0x1b25/0x2760 [ 26.611514] ? mm_update_next_owner+0x9a0/0x9a0 [ 26.616182] ? kfree+0x15e/0x260 [ 26.619547] ? kvm_vcpu_ioctl+0x2ba/0x1300 [ 26.623785] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 26.629499] ? is_bpf_text_address+0xd7/0x170 [ 26.633995] ? kernel_text_address+0x79/0xf0 [ 26.638403] ? __kernel_text_address+0xd/0x40 [ 26.642902] ? unwind_get_return_address+0x61/0xa0 [ 26.647833] ? __save_stack_trace+0x8d/0xf0 [ 26.652159] ? save_stack+0xa9/0xd0 [ 26.655783] ? save_stack+0x43/0xd0 [ 26.659408] ? __kasan_slab_free+0x11a/0x170 [ 26.663813] ? kasan_slab_free+0xe/0x10 [ 26.667787] ? putname+0xf2/0x130 [ 26.671238] ? __x64_sys_openat+0x9d/0x100 [ 26.675468] ? do_syscall_64+0x1b9/0x820 [ 26.679522] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 26.684887] ? lock_acquire+0x1e4/0x540 [ 26.688876] ? quarantine_put+0x193/0x1b0 [ 26.693022] ? lock_downgrade+0x8f0/0x8f0 [ 26.697180] ? __fget_light+0x2f7/0x440 [ 26.701153] ? fget_raw+0x20/0x20 [ 26.704603] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 26.709187] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 26.714896] ? do_vfs_ioctl+0x201/0x1720 [ 26.718954] ? ioctl_preallocate+0x300/0x300 [ 26.723362] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.728903] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 26.734442] ? sockfd_lookup_light+0xc5/0x160 [ 26.738938] ? __sys_setsockopt+0x257/0x3b0 [ 26.743259] ? putname+0xf7/0x130 [ 26.746712] do_group_exit+0x177/0x440 [ 26.750597] ? __ia32_sys_exit+0x50/0x50 [ 26.754661] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.760199] __x64_sys_exit_group+0x3e/0x50 [ 26.764523] do_syscall_64+0x1b9/0x820 [ 26.768408] ? syscall_slow_exit_work+0x500/0x500 [ 26.773246] ? syscall_return_slowpath+0x5e0/0x5e0 [ 26.778174] ? syscall_return_slowpath+0x31d/0x5e0 [ 26.783103] ? prepare_exit_to_usermode+0x291/0x3b0 [ 26.788119] ? perf_trace_sys_enter+0xb10/0xb10 [ 26.792791] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.797638] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 26.802827] RIP: 0033:0x43f298 [ 26.806022] Code: Bad RIP value. [ 26.809383] RSP: 002b:00007ffd9a5ea108 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 26.817115] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043f298 [ 26.824392] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 26.831659] RBP: 00000000004beb48 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 26.838924] R10: 0000000020000300 R11: 0000000000000246 R12: 0000000000000001 [ 26.846190] R13: 00000000006d01c0 R14: 0000000000000000 R15: 0000000000000000 [ 26.853463] Modules linked in: [ 26.856656] Dumping ftrace buffer: [ 26.860183] (ftrace buffer empty) [ 26.863899] ---[ end trace 6ada14f520c59495 ]--- [ 26.868666] RIP: 0010:__schedule+0x1061/0x1ec0 [ 26.873248] 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 [ 26.892159] RSP: 0018:ffff8801aceb6a80 EFLAGS: 00010806 [ 26.897525] RAX: 1bd5a00000000022 RBX: ffff8801acc12580 RCX: 1ffff1003594388f [ 26.904800] RDX: 0000000040000000 RSI: 0000000000000000 RDI: dead000000000110 [ 26.912067] RBP: ffff8801aceb6c50 R08: ffff8801acc12580 R09: fffff520003c2a47 [ 26.919334] R10: fffff520003c2a47 R11: ffffc90001e1523b R12: ffff8801ca592240 [ 26.926598] R13: dead000000000100 R14: dffffc0000000000 R15: ffff8801db12ca40 [ 26.933871] FS: 0000000000e39880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 26.942090] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.947964] CR2: 000000000043f26e CR3: 00000001cab35000 CR4: 00000000001426e0 [ 26.955229] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.962492] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.969763] Kernel panic - not syncing: Fatal exception [ 28.029585] Shutting down cpus with NMI [ 28.033928] Dumping ftrace buffer: [ 28.037459] (ftrace buffer empty) [ 28.041153] Kernel Offset: disabled [ 28.044761] Rebooting in 86400 seconds..