TITLE: unexpected kernel reboot
TYPE: REBOOT

tkill(r8, 0x13)
mmap(&(0x7f0000000000/0x1000)=nil, 0x1000, 0x3, 0x32, 0xffffffffffffffff, 0x0)
SeaBIOS (version 1.8.2-20171012_061934-google)
Total RAM Size = 0x00000001e0000000 = 7680 MiB
Failed to get pci whitelist data
CPUs found: 2     Max CPUs supported: 2
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f3030: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Booting from Hard Disk 0...
early console in extract_kernel
input_data: 0x0000000005f13276
input_len: 0x0000000001e7f701
output: 0x0000000001000000
output_len: 0x0000000005c85958
kernel_total_size: 0x0000000006db2000

Decompressing Linux... Parsing ELF... done.
Booting the kernel.
[    0.000000] Linux version 4.15.0-rc1-next-20171128+ (syzkaller@ci) (gcc version 7.1.1 20170620 (GCC)) #54 SMP Tue Nov 28 04:02:11 UTC 2017
[    0.000000] Command line: BOOT_IMAGE=/vmlinuz root=/dev/sda1 console=ttyS0 earlyprintk=serial vsyscall=native rodata=n ftrace_dump_on_oops=orig_cpu oops=panic panic_on_warn=1 nmi_watchdog=panic panic=86400 kvm-intel.nested=1
[    0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
[    0.000000] x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
[    0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[    1.824260] tsc: Refined TSC clocksource calibration: 2299.821 MHz
[    1.873620] input: ImPS/2 Generic Wheel Mouse as /devices/platform/i8042/serio1/input/input4
[    1.962277] VFS: Mounted root (ext4 filesystem) readonly on device 8:1.
[    1.964194] devtmpfs: mounted
[    1.971300] Freeing unused kernel memory: 2344K
[    1.887427] EXT4-fs (sda1): INFO: recovery required on readonly filesystem
[    1.971945] Kernel memory protection disabled.
