[....] 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[ 16.225675] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.677431] random: sshd: uninitialized urandom read (32 bytes read) [ 18.955378] random: sshd: uninitialized urandom read (32 bytes read) [ 19.412533] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. [ 24.976524] urandom_read: 1 callbacks suppressed [ 24.976530] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.081538] kasan: CONFIG_KASAN_INLINE enabled [ 25.086150] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 25.093509] general protection fault: 0000 [#1] SMP KASAN [ 25.099043] CPU: 0 PID: 4324 Comm: syz-executor151 Not tainted 4.18.0-rc8-next-20180807+ #33 [ 25.107608] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.116967] RIP: 0010:__schedule+0x1061/0x1ec0 [ 25.121547] 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 28 04 fb eb 9f 4c 89 e6 48 89 df e8 e6 [ 25.140441] RSP: 0018:ffff8801ad87ea80 EFLAGS: 00010806 [ 25.145803] RAX: 1bd5a00000000022 RBX: ffff8801ad96a280 RCX: 1ffff1003648a88f [ 25.153075] RDX: 0000000040000000 RSI: 0000000000000000 RDI: dead000000000110 [ 25.160348] RBP: ffff8801ad87ec50 R08: ffff8801ad96a280 R09: fffff520003c1a47 [ 25.167611] R10: fffff520003c1a47 R11: ffffc90001e0d23b R12: ffff8801ca5b42c0 [ 25.174880] R13: dead000000000100 R14: dffffc0000000000 R15: ffff8801db02ca40 [ 25.182150] FS: 00000000020ea880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 [ 25.190370] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.196242] CR2: 00007f75c763f000 CR3: 00000001ca470000 CR4: 00000000001426f0 [ 25.203514] Call Trace: [ 25.206102] ? trace_hardirqs_on+0x10/0x10 [ 25.210343] ? __sched_text_start+0x8/0x8 [ 25.214492] ? generic_exec_single+0x1ea/0x5e0 [ 25.219084] ? add_nops+0x90/0x90 [ 25.222536] ? smp_call_on_cpu+0x540/0x540 [ 25.226854] ? retint_kernel+0x10/0x10 [ 25.230747] ? smp_call_function_single+0x43c/0x5c0 [ 25.235775] ? check_same_owner+0x340/0x340 [ 25.240094] ? smp_call_function_single+0x2d6/0x5c0 [ 25.245124] ? add_nops+0x90/0x90 [ 25.248582] ? arch_jump_label_transform+0x1b/0x40 [ 25.253513] preempt_schedule_common+0x22/0x60 [ 25.258090] _cond_resched+0x1d/0x30 [ 25.261797] __mutex_lock+0x13d/0x1700 [ 25.265679] ? fill_pte+0xd6/0x420 [ 25.269212] ? arch_jump_label_transform+0x1b/0x40 [ 25.274171] ? mutex_trylock+0x2b0/0x2b0 [ 25.278232] ? smp_call_function_many+0x123/0xa40 [ 25.283072] ? __native_set_fixmap+0x49/0x60 [ 25.287477] ? arch_jump_label_transform+0x3b/0x40 [ 25.292413] ? lock_downgrade+0x8f0/0x8f0 [ 25.296553] ? smp_call_function_single_async+0x340/0x340 [ 25.302084] ? __native_set_fixmap+0x60/0x60 [ 25.306495] ? trace_hardirqs_on+0xd/0x10 [ 25.310645] ? kvm_can_do_async_pf+0xf/0x2f0 [ 25.315048] ? do_sync_core+0x18/0x20 [ 25.318847] ? trace_hardirqs_on+0xd/0x10 [ 25.322989] ? kasan_check_write+0x14/0x20 [ 25.327231] ? __mutex_unlock_slowpath+0x197/0x8c0 [ 25.332158] ? wait_for_completion+0x8d0/0x8d0 [ 25.336738] ? kvm_can_do_async_pf+0xf/0x2f0 [ 25.341146] ? __jump_label_transform.isra.0+0x478/0x8f0 [ 25.346596] ? modules_open+0xa0/0xa0 [ 25.350392] ? kvm_vm_release+0x42/0x50 [ 25.354360] ? get_trap_addr+0x1d0/0x1d0 [ 25.358418] ? do_group_exit+0x177/0x440 [ 25.362476] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.368018] ? jump_label_type+0x132/0x1d0 [ 25.372253] ? static_key_count+0x130/0x130 [ 25.376572] mutex_lock_nested+0x16/0x20 [ 25.380629] ? mutex_lock_nested+0x16/0x20 [ 25.384862] arch_jump_label_transform+0x1b/0x40 [ 25.389615] __jump_label_update+0x16e/0x1a0 [ 25.394023] jump_label_update+0x151/0x2e0 [ 25.398265] __static_key_slow_dec_cpuslocked+0xb8/0x210 [ 25.403713] ? static_key_disable+0x30/0x30 [ 25.408035] static_key_slow_dec+0x63/0xa0 [ 25.412267] kvm_arch_vcpu_uninit+0x18e/0x1d0 [ 25.416772] kvm_vcpu_uninit+0x44/0x90 [ 25.420655] vmx_free_vcpu+0x23a/0x300 [ 25.424563] kvm_arch_destroy_vm+0x365/0x7c0 [ 25.428994] ? kasan_check_read+0x13/0x20 [ 25.433136] ? kvm_arch_sync_events+0x30/0x30 [ 25.437633] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 25.443170] ? mmu_notifier_unregister+0x474/0x600 [ 25.448107] ? debug_check_no_obj_freed+0x30b/0x595 [ 25.453131] ? __mmu_notifier_register+0x30/0x30 [ 25.457889] ? __free_pages+0x10a/0x190 [ 25.461858] ? free_unref_page+0x9a0/0x9a0 [ 25.466096] kvm_put_kvm+0x73f/0x1060 [ 25.469897] ? kvm_write_guest_cached+0x40/0x40 [ 25.474575] ? lock_acquire+0x1e4/0x540 [ 25.478543] ? kvm_irqfd_release+0xd1/0x120 [ 25.482855] ? lock_downgrade+0x8f0/0x8f0 [ 25.487009] ? kasan_check_write+0x14/0x20 [ 25.491239] ? do_raw_spin_lock+0xc1/0x200 [ 25.495473] ? kvm_irqfd_release+0xdd/0x120 [ 25.499798] ? kvm_put_kvm+0x1060/0x1060 [ 25.503857] kvm_vm_release+0x42/0x50 [ 25.507654] __fput+0x376/0x8a0 [ 25.510931] ? __alloc_file+0x400/0x400 [ 25.514903] ? check_same_owner+0x340/0x340 [ 25.519218] ? kasan_check_write+0x14/0x20 [ 25.523450] ? do_raw_spin_lock+0xc1/0x200 [ 25.527684] ____fput+0x15/0x20 [ 25.530981] task_work_run+0x1e8/0x2a0 [ 25.534864] ? task_work_cancel+0x240/0x240 [ 25.539184] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 25.544719] ? switch_task_namespaces+0xa2/0xd0 [ 25.549387] do_exit+0x1b25/0x2760 [ 25.552924] ? mm_update_next_owner+0x9a0/0x9a0 [ 25.557590] ? kfree+0x15e/0x260 [ 25.560951] ? kvm_vcpu_ioctl+0x2ba/0x1300 [ 25.565186] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 25.570897] ? is_bpf_text_address+0xd7/0x170 [ 25.575389] ? kernel_text_address+0x79/0xf0 [ 25.579803] ? __kernel_text_address+0xd/0x40 [ 25.584309] ? unwind_get_return_address+0x61/0xa0 [ 25.589238] ? __save_stack_trace+0x8d/0xf0 [ 25.593561] ? save_stack+0xa9/0xd0 [ 25.597185] ? save_stack+0x43/0xd0 [ 25.600805] ? __kasan_slab_free+0x11a/0x170 [ 25.605208] ? kasan_slab_free+0xe/0x10 [ 25.609175] ? putname+0xf2/0x130 [ 25.612627] ? __x64_sys_openat+0x9d/0x100 [ 25.616860] ? do_syscall_64+0x1b9/0x820 [ 25.620922] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 25.626287] ? kasan_check_read+0x11/0x20 [ 25.630433] ? do_raw_spin_unlock+0xa7/0x2f0 [ 25.634836] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 25.639416] ? initcall_blacklisted+0x9a/0x1e0 [ 25.643991] ? do_raw_spin_lock+0xc1/0x200 [ 25.648235] ? trace_hardirqs_off+0xd/0x10 [ 25.652470] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 25.657587] ? kvm_uevent_notify_change.part.32+0x440/0x440 [ 25.663297] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.668828] ? do_vfs_ioctl+0x201/0x1720 [ 25.672885] ? ioctl_preallocate+0x300/0x300 [ 25.677985] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.683518] ? __fget_light+0x2f7/0x440 [ 25.687494] ? fget_raw+0x20/0x20 [ 25.690940] ? trace_hardirqs_on+0xd/0x10 [ 25.695082] ? kmem_cache_free+0x22e/0x2d0 [ 25.699323] ? putname+0xf7/0x130 [ 25.702773] do_group_exit+0x177/0x440 [ 25.706655] ? __ia32_sys_exit+0x50/0x50 [ 25.710714] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.716244] ? ksys_ioctl+0x81/0xd0 [ 25.719867] __x64_sys_exit_group+0x3e/0x50 [ 25.724186] do_syscall_64+0x1b9/0x820 [ 25.728073] ? syscall_return_slowpath+0x5e0/0x5e0 [ 25.733002] ? syscall_return_slowpath+0x31d/0x5e0 [ 25.737928] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 25.742954] ? prepare_exit_to_usermode+0x291/0x3b0 [ 25.747967] ? perf_trace_sys_enter+0xb10/0xb10 [ 25.752634] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.757509] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 25.762689] RIP: 0033:0x43ef08 [ 25.765878] Code: Bad RIP value. [ 25.769234] RSP: 002b:00007ffe0e7c5fd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 25.776939] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ef08 [ 25.784200] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 25.791463] RBP: 00000000004be7c8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 25.798727] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 25.805990] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 25.813254] Modules linked in: [ 25.816440] Dumping ftrace buffer: [ 25.819980] (ftrace buffer empty) [ 25.823693] ---[ end trace a17cfc5568be6d4f ]--- [ 25.828462] RIP: 0010:__schedule+0x1061/0x1ec0 [ 25.833071] 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 28 04 fb eb 9f 4c 89 e6 48 89 df e8 e6 [ 25.851964] RSP: 0018:ffff8801ad87ea80 EFLAGS: 00010806 [ 25.857324] RAX: 1bd5a00000000022 RBX: ffff8801ad96a280 RCX: 1ffff1003648a88f [ 25.864594] RDX: 0000000040000000 RSI: 0000000000000000 RDI: dead000000000110 [ 25.871860] RBP: ffff8801ad87ec50 R08: ffff8801ad96a280 R09: fffff520003c1a47 [ 25.879120] R10: fffff520003c1a47 R11: ffffc90001e0d23b R12: ffff8801ca5b42c0 [ 25.886397] R13: dead000000000100 R14: dffffc0000000000 R15: ffff8801db02ca40 [ 25.893665] FS: 00000000020ea880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 [ 25.901883] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.907756] CR2: 000000000043eede CR3: 00000001ca470000 CR4: 00000000001426f0 [ 25.915019] Kernel panic - not syncing: Fatal exception [ 27.017874] Shutting down cpus with NMI [ 27.022187] Dumping ftrace buffer: [ 27.025712] (ftrace buffer empty) [ 27.029399] Kernel Offset: disabled [ 27.033008] Rebooting in 86400 seconds..