[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 51.890859][ T23] audit: type=1800 audit(1584698116.212:25): pid=8482 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 51.910146][ T23] audit: type=1800 audit(1584698116.212:26): pid=8482 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 51.931863][ T23] audit: type=1800 audit(1584698116.222:27): pid=8482 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.11' (ECDSA) to the list of known hosts. syzkaller login: [ 64.696838][ T8634] L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. [ 66.226295][ T8742] BUG: kernel NULL pointer dereference, address: 0000000000000086 [ 66.234149][ T8742] #PF: supervisor instruction fetch in kernel mode [ 66.240623][ T8742] #PF: error_code(0x0010) - not-present page [ 66.246571][ T8742] PGD 913ae067 P4D 913ae067 PUD 92f95067 PMD 0 [ 66.252813][ T8742] Oops: 0010 [#1] PREEMPT SMP KASAN [ 66.257993][ T8742] CPU: 1 PID: 8742 Comm: syz-executor543 Not tainted 5.6.0-rc6-syzkaller #0 [ 66.266631][ T8742] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.276661][ T8742] RIP: 0010:0x86 [ 66.280189][ T8742] Code: Bad RIP value. [ 66.284225][ T8742] RSP: 0018:ffffc900021d7998 EFLAGS: 00010086 [ 66.290257][ T8742] RAX: ffffc900021d79c8 RBX: fffffe0000000000 RCX: ffff88809d522500 [ 66.298208][ T8742] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 66.306206][ T8742] RBP: 0000000000000ec0 R08: ffffffff83987263 R09: ffffffff811c7eca [ 66.314163][ T8742] R10: ffff88809d522500 R11: 0000000000000002 R12: dffffc0000000000 [ 66.322119][ T8742] R13: fffffe0000000ec8 R14: ffffffff880016f0 R15: fffffe0000000ecb [ 66.330081][ T8742] FS: 00000000021c0880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 66.338987][ T8742] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 66.345544][ T8742] CR2: 000000000000005c CR3: 0000000095b79000 CR4: 00000000001426e0 [ 66.353498][ T8742] Call Trace: [ 66.356773][ T8742] ? handle_external_interrupt_irqoff+0x154/0x280 [ 66.363168][ T8742] ? handle_external_interrupt_irqoff+0x132/0x280 [ 66.369555][ T8742] ? __irqentry_text_start+0x8/0x8 [ 66.374639][ T8742] ? vcpu_enter_guest+0x6c77/0x9290 [ 66.379827][ T8742] ? __kasan_slab_free+0x12e/0x1e0 [ 66.384909][ T8742] ? kfree+0x10a/0x220 [ 66.388947][ T8742] ? tomoyo_path_number_perm+0x525/0x690 [ 66.394558][ T8742] ? security_file_ioctl+0x55/0xb0 [ 66.399649][ T8742] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.405700][ T8742] ? __lock_acquire+0xc5a/0x1bc0 [ 66.410605][ T8742] ? x2apic_send_IPI+0x96/0xc0 [ 66.415345][ T8742] ? mark_lock+0x107/0x1650 [ 66.419832][ T8742] ? lock_acquire+0x154/0x250 [ 66.424489][ T8742] ? rcu_lock_acquire+0x9/0x30 [ 66.429235][ T8742] ? vcpu_run+0x3a3/0xd50 [ 66.433549][ T8742] ? kvm_arch_vcpu_ioctl_run+0x419/0x880 [ 66.439161][ T8742] ? kvm_vcpu_ioctl+0x67c/0xa80 [ 66.443985][ T8742] ? rcu_read_lock_sched_held+0x106/0x170 [ 66.449679][ T8742] ? kvm_vm_release+0x50/0x50 [ 66.454325][ T8742] ? __se_sys_ioctl+0xf9/0x160 [ 66.459062][ T8742] ? do_syscall_64+0xf3/0x1b0 [ 66.463719][ T8742] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.469754][ T8742] Modules linked in: [ 66.473622][ T8742] CR2: 0000000000000086 [ 66.477750][ T8742] ---[ end trace 88183239d3f1335b ]--- [ 66.483178][ T8742] RIP: 0010:0x86 [ 66.486706][ T8742] Code: Bad RIP value. [ 66.490739][ T8742] RSP: 0018:ffffc900021d7998 EFLAGS: 00010086 [ 66.496783][ T8742] RAX: ffffc900021d79c8 RBX: fffffe0000000000 RCX: ffff88809d522500 [ 66.504726][ T8742] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 66.512669][ T8742] RBP: 0000000000000ec0 R08: ffffffff83987263 R09: ffffffff811c7eca [ 66.520615][ T8742] R10: ffff88809d522500 R11: 0000000000000002 R12: dffffc0000000000 [ 66.528560][ T8742] R13: fffffe0000000ec8 R14: ffffffff880016f0 R15: fffffe0000000ecb [ 66.536514][ T8742] FS: 00000000021c0880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 66.545417][ T8742] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 66.551984][ T8742] CR2: 000000000000005c CR3: 0000000095b79000 CR4: 00000000001426e0 [ 66.559957][ T8742] Kernel panic - not syncing: Fatal exception [ 66.567133][ T8742] Kernel Offset: disabled [ 66.571548][ T8742] Rebooting in 86400 seconds..