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Date:   Mon, 1 Apr 2019 22:02:07 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Nikolay Borisov <nborisov@...e.com>, Qu Wenruo <wqu@...e.com>
Cc:     David Sterba <dsterba@...e.com>,
        Yoon Jungyeon <jungyeon@...ech.edu>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: Re: [btrfs] 70d28b0e4f:
 BUG:kernel_reboot-without-warning_in_early-boot_stage,last_printk:Probing_EDD(edd=off_to_disable)...ok


On 4/1/2019 9:28 PM, Nikolay Borisov wrote:
>
> On 1.04.19 г. 16:24 ч., kernel test robot wrote:
>> FYI, we noticed the following commit (built with gcc-7):
>>
>> commit: 70d28b0e4f8ed2d38571e7b1f9bec7f321a53102 ("btrfs: tree-checker: Verify dev item")
>> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
>>
>> in testcase: trinity
>> with following parameters:
>>
>> 	runtime: 300s
>>
>> test-description: Trinity is a linux system call fuzz tester.
>> test-url: http://codemonkey.org.uk/projects/trinity/
>>
>>
>> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 2G
>>
>> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>>
>>
>> +--------------------------------------------------------------------------------------------------------+------------+------------+
>> |                                                                                                        | 36b9d2bc69 | 70d28b0e4f |
>> +--------------------------------------------------------------------------------------------------------+------------+------------+
>> | boot_successes                                                                                         | 14         | 0          |
>> | boot_failures                                                                                          | 2          | 14         |
>> | IP-Config:Auto-configuration_of_network_failed                                                         | 2          |            |
>> | BUG:kernel_reboot-without-warning_in_early-boot_stage,last_printk:Probing_EDD(edd=off_to_disable)...ok | 0          | 14         |
>> +--------------------------------------------------------------------------------------------------------+------------+------------+
>>
>>
>>
>> early console in setup code
>> Probing EDD (edd=off to disable)... ok
>> BUG: kernel reboot-without-warning in early-boot stage, last printk: Probing EDD (edd=off to disable)... ok
>> Linux version 5.0.0-rc8-00196-g70d28b0 #1
>> Command line: ip=::::vm-snb-quantal-x86_64-1415::dhcp root=/dev/ram0 user=lkp job=/lkp/jobs/scheduled/vm-snb-quantal-x86_64-1415/trinity-300s-quantal-core-x86_64-2018-11-09.cgz-70d28b0-20190330-29362-1y6g0qb-2.yaml ARCH=x86_64 kconfig=x86_64-randconfig-s5-03231928 branch=linux-devel/devel-hourly-2019032317 commit=70d28b0e4f8ed2d38571e7b1f9bec7f321a53102 BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s5-03231928/gcc-7/70d28b0e4f8ed2d38571e7b1f9bec7f321a53102/vmlinuz-5.0.0-rc8-00196-g70d28b0 max_uptime=1500 RESULT_ROOT=/result/trinity/300s/vm-snb-quantal-x86_64/quantal-core-x86_64-2018-11-09.cgz/x86_64-randconfig-s5-03231928/gcc-7/70d28b0e4f8ed2d38571e7b1f9bec7f321a53102/8 LKP_SERVER=inn debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 net.ifnames=0 printk.devkmsg=on panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 drbd.minor_count=8 systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200 console=ttyS0,115200 vga=normal rw rcuperf.shutdown=0
>>
> Can this report be made useful by actually including output from serial
> console? For example possible bug-ons or whatnot? dmesg.xz just contains
> qemu's command line + some metadata about the test and :
>
> "BUG: kernel reboot-without-warning in early-boot stage, last printk:
> Probing EDD (edd=off to disable)... ok"
>
> At least a stack trace would have been useful.
>
> <snip>


Hi,

We usually use the tool ("bin/lkp qemu -k <bzImage> job-script") to 
reproduce it.  It seems no stack trace in the result:

$ lkp qemu -k vmlinuz-5.0.0-rc8-00196-g70d28b0 job-script
...
Formatting '/tmp/vdisk-nfs/disk-vm-snb-quantal-x86_64-1415-0', fmt=qcow2 
size=274877906944 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Formatting '/tmp/vdisk-nfs/disk-vm-snb-quantal-x86_64-1415-1', fmt=qcow2 
size=274877906944 cluster_size=65536 lazy_refcounts=off refcount_bits=16
exec command: qemu-system-x86_64 -enable-kvm -fsdev 
local,id=test_dev,path=/home/nfs/.lkp//result/trinity/300s/vm-snb-quantal-x86_64/quantal-core-x86_64-2018-11-09.cgz/x86_64-randconfig-s5-03231928/gcc-7/70d28b0e4f8ed2d38571e7b1f9bec7f321a53102/2,security_model=none 
-device virtio-9p-pci,fsdev=test_dev,mount_tag=9p/virtfs_mount -kernel 
vmlinuz-5.0.0-rc8-00196-g70d28b0 -append root=/dev/ram0 user=lkp 
job=/lkp/jobs/scheduled/vm-snb-quantal-x86_64-1415/trinity-300s-quantal-core-x86_64-2018-11-09.cgz-70d28b0-20190330-29362-1y6g0qb-2.yaml 
ARCH=x86_64 kconfig=x86_64-randconfig-s5-03231928 
branch=linux-devel/devel-hourly-2019032317 
commit=70d28b0e4f8ed2d38571e7b1f9bec7f321a53102 
BOOT_IMAGE=/pkg/linux/x86_64-randconfig-s5-03231928/gcc-7/70d28b0e4f8ed2d38571e7b1f9bec7f321a53102/vmlinuz-5.0.0-rc8-00196-g70d28b0 
max_uptime=1500 
RESULT_ROOT=/result/trinity/300s/vm-snb-quantal-x86_64/quantal-core-x86_64-2018-11-09.cgz/x86_64-randconfig-s5-03231928/gcc-7/70d28b0e4f8ed2d38571e7b1f9bec7f321a53102/8 
LKP_LOCAL_RUN=1 debug apic=debug sysrq_always_enabled 
rcupdate.rcu_cpu_stall_timeout=100 net.ifnames=0 printk.devkmsg=on 
panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 
prompt_ramdisk=0 drbd.minor_count=8 systemd.log_level=err 
ignore_loglevel console=tty0 earlyprintk=ttyS0,115200 
console=ttyS0,115200 vga=normal rw ip=dhcp 
result_service=9p/virtfs_mount -initrd /home/nfs/.lkp/cache/final_initrd 
-smp 2 -m 2048M -no-reboot -watchdog i6300esb -rtc base=localtime 
-device e1000,netdev=net0 -netdev user,id=net0 -display none -monitor 
null -serial stdio -drive 
file=/tmp/vdisk-nfs/disk-vm-snb-quantal-x86_64-1415-0,media=disk,if=virtio 
-drive 
file=/tmp/vdisk-nfs/disk-vm-snb-quantal-x86_64-1415-1,media=disk,if=virtio
early console in setup code
Probing EDD (edd=off to disable)... ok

Best Regards,
Rong Chen

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