[....] 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[?25l[?1c7[ ok 8[?25h[?0c. [ 28.763694] kauditd_printk_skb: 7 callbacks suppressed [ 28.763706] audit: type=1800 audit(1543667547.140:29): pid=5874 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 28.795676] audit: type=1800 audit(1543667547.150:30): pid=5874 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 31.293156] sshd (6012) used greatest stack depth: 15632 bytes left Warning: Permanently added '10.128.0.96' (ECDSA) to the list of known hosts. executing program [ 38.046973] L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details. [ 38.096419] kasan: CONFIG_KASAN_INLINE enabled [ 38.101000] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 38.108341] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 38.114553] CPU: 1 PID: 6030 Comm: syz-executor691 Not tainted 4.20.0-rc1-next-20181109+ #110 [ 38.123198] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.132541] RIP: 0010:__lock_acquire+0xa00/0x4c20 [ 38.137363] Code: 28 00 00 00 0f 85 3e 2b 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 aa 2c 00 00 49 81 7d 00 60 e2 52 8a 0f 84 3d f7 [ 38.156249] RSP: 0018:ffff8801bf966ff0 EFLAGS: 00010006 [ 38.161591] RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000 [ 38.168841] RDX: 0000000000000039 RSI: 0000000000000000 RDI: 00000000000001c8 [ 38.176097] RBP: ffff8801bf967378 R08: 0000000000000001 R09: 0000000000000000 [ 38.183359] R10: 0000000000000001 R11: ffff8801c09b6580 R12: ffff8801c09b6580 [ 38.190609] R13: 00000000000001c8 R14: 0000000000000000 R15: 0000000000000000 [ 38.197859] FS: 00007f1655c4d700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 38.206065] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.211922] CR2: 00007f65bb7bc000 CR3: 00000001c09d4000 CR4: 00000000001426e0 [ 38.219175] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.226424] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.233669] Call Trace: [ 38.236242] ? mark_held_locks+0x130/0x130 [ 38.240467] ? kasan_check_read+0x11/0x20 [ 38.244593] ? __lock_acquire+0x2aff/0x4c20 [ 38.248893] ? lock_downgrade+0x900/0x900 [ 38.253023] ? mark_held_locks+0x130/0x130 [ 38.257248] ? mark_held_locks+0x130/0x130 [ 38.261464] ? add_timer+0x629/0x15a0 [ 38.265243] ? graph_lock+0x270/0x270 [ 38.269023] ? mod_timer+0x1550/0x1550 [ 38.273112] ? crash_vmclear_local_loaded_vmcss+0x1a0/0x1a0 [ 38.278806] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.284324] ? check_preemption_disabled+0x48/0x280 [ 38.289323] ? find_held_lock+0x36/0x1c0 [ 38.293364] ? kvm_arch_vcpu_ioctl_run+0x4293/0x72b0 [ 38.298450] ? print_usage_bug+0xc0/0xc0 [ 38.302492] ? lock_downgrade+0x900/0x900 [ 38.306622] lock_acquire+0x1ed/0x520 [ 38.310408] ? kvm_ioapic_scan_entry+0x7f/0x3c0 [ 38.315097] ? lock_release+0xa10/0xa10 [ 38.319060] ? handle_vmptrst+0x2e0/0x2e0 [ 38.323188] ? mark_held_locks+0xc7/0x130 [ 38.327328] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.332845] ? kvm_hv_setup_tsc_page+0xc9/0x6f0 [ 38.337499] _raw_spin_lock+0x2d/0x40 [ 38.341282] ? kvm_ioapic_scan_entry+0x7f/0x3c0 [ 38.345933] kvm_ioapic_scan_entry+0x7f/0x3c0 [ 38.350412] kvm_arch_vcpu_ioctl_run+0x32c4/0x72b0 [ 38.355323] ? _raw_read_unlock_irqrestore+0x50/0xd0 [ 38.360412] ? kvm_arch_vcpu_runnable+0x710/0x710 [ 38.365241] ? debug_object_free+0x32d/0x690 [ 38.369630] ? __init_waitqueue_head+0x9e/0x150 [ 38.374322] ? debug_object_destroy+0x2b0/0x2b0 [ 38.378980] ? __wait_rcu_gp+0x24e/0x330 [ 38.383027] ? synchronize_rcu.part.54+0x104/0x120 [ 38.387942] ? synchronize_rcu_expedited+0xa0/0xa0 [ 38.392851] ? rcu_read_unlock_special+0x370/0x370 [ 38.397762] ? kfree_call_rcu+0x10/0x10 [ 38.401734] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 38.407251] ? put_pid.part.2+0x1c5/0x240 [ 38.411378] ? pid_task+0x200/0x200 [ 38.414991] kvm_vcpu_ioctl+0x5c8/0x1150 [ 38.419036] ? kvm_vcpu_ioctl+0x5c8/0x1150 [ 38.423259] ? kvm_uevent_notify_change.part.32+0x450/0x450 [ 38.428959] ? find_held_lock+0x36/0x1c0 [ 38.432998] ? __fget+0x4aa/0x740 [ 38.436436] ? check_preemption_disabled+0x48/0x280 [ 38.441435] ? kasan_check_read+0x11/0x20 [ 38.445560] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 38.450813] ? rcu_read_unlock_special+0x370/0x370 [ 38.455724] ? __fget+0x4d1/0x740 [ 38.459162] ? ksys_dup3+0x680/0x680 [ 38.462980] ? kvm_uevent_notify_change.part.32+0x450/0x450 [ 38.468678] do_vfs_ioctl+0x1de/0x1790 [ 38.472543] ? ioctl_preallocate+0x300/0x300 [ 38.476931] ? __fget_light+0x2e9/0x430 [ 38.480886] ? fget_raw+0x20/0x20 [ 38.484319] ? __x64_sys_futex+0x47f/0x6a0 [ 38.488535] ? do_syscall_64+0x9a/0x820 [ 38.492488] ? do_syscall_64+0x9a/0x820 [ 38.496445] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 38.501012] ? security_file_ioctl+0x94/0xc0 [ 38.505402] ksys_ioctl+0xa9/0xd0 [ 38.508840] __x64_sys_ioctl+0x73/0xb0 [ 38.512708] do_syscall_64+0x1b9/0x820 [ 38.516582] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 38.521933] ? syscall_return_slowpath+0x5e0/0x5e0 [ 38.526840] ? trace_hardirqs_on_caller+0x310/0x310 [ 38.531840] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 38.536841] ? post_copy_siginfo_from_user.isra.25.part.26+0x250/0x250 [ 38.543490] ? __switch_to_asm+0x40/0x70 [ 38.547534] ? __switch_to_asm+0x34/0x70 [ 38.551601] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.556431] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.561599] RIP: 0033:0x445a69 [ 38.564836] Code: e8 8c bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 cb 11 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 38.583719] RSP: 002b:00007f1655c4cce8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010 [ 38.591406] RAX: ffffffffffffffda RBX: 00000000006dbc58 RCX: 0000000000445a69 [ 38.598660] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 38.605908] RBP: 00000000006dbc50 R08: 0000000000000000 R09: 0000000000000000 [ 38.613159] R10: 0000000000000000 R11: 0000000000000206 R12: 00000000006dbc5c [ 38.620408] R13: 00007ffc3461a4ef R14: 00007f1655c4d9c0 R15: 00000000006dbd4c [ 38.627661] Modules linked in: [ 38.630837] ---[ end trace 97f58e52773bf6cc ]--- [ 38.635577] RIP: 0010:__lock_acquire+0xa00/0x4c20 [ 38.640400] Code: 28 00 00 00 0f 85 3e 2b 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 aa 2c 00 00 49 81 7d 00 60 e2 52 8a 0f 84 3d f7 [ 38.659281] RSP: 0018:ffff8801bf966ff0 EFLAGS: 00010006 [ 38.664621] RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000 [ 38.671871] RDX: 0000000000000039 RSI: 0000000000000000 RDI: 00000000000001c8 [ 38.679122] RBP: ffff8801bf967378 R08: 0000000000000001 R09: 0000000000000000 [ 38.686375] R10: 0000000000000001 R11: ffff8801c09b6580 R12: ffff8801c09b6580 [ 38.693621] R13: 00000000000001c8 R14: 0000000000000000 R15: 0000000000000000 [ 38.700874] FS: 00007f1655c4d700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 38.709096] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.714957] CR2: 00007f65bb7bc000 CR3: 00000001c09d4000 CR4: 00000000001426e0 [ 38.722210] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.729461] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.736709] Kernel panic - not syncing: Fatal exception [ 38.742993] Kernel Offset: disabled [ 38.746615] Rebooting in 86400 seconds..