Re: [LKP] [btrfs] 70d28b0e4f: BUG:kernel_reboot-without-warning_in_early-boot_stage, last_printk:Probing_EDD(edd=off_to_disable)...ok

[Rong Chen <rong.a.chen@intel.com>]

On 4/1/19 11:40 PM, David Sterba wrote:
> On Mon, Apr 01, 2019 at 11:02:37PM +0800,  Chen, Rong A  wrote:
>> On 4/1/2019 10:29 PM, Qu Wenruo wrote:
>>> On 2019/4/1 下午10:02,  Chen, Rong A  wrote:
>>>> 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:
>>> So there is no regression at that commit right?
>>>
>>> Just some false alert?
>>
>> Hi,
>>
>> I think there's a regression, it stopped in the early-boot stage .
> Can you please provide any logs that would point at btrfs? If the module
> is loaded or built-in started, there's a line about that. Besides that
> it's preceded by messages from other subsystems' initialization.


Hi,

CONFIG_BTRFS_FS and CONFIG_BTRFS_FS_REF_VERIFY is enabled in the kconfig.
I disabled them for the experiment, and the new kernel is bootable. I 
don't have more logs to prove it.

$ grep BTRFS config-5.0.0-rc8-00196-g70d28b0
CONFIG_BTRFS_FS=y
# CONFIG_BTRFS_FS_POSIX_ACL is not set
# CONFIG_BTRFS_FS_CHECK_INTEGRITY is not set
# CONFIG_BTRFS_FS_RUN_SANITY_TESTS is not set
# CONFIG_BTRFS_DEBUG is not set
# CONFIG_BTRFS_ASSERT is not set
CONFIG_BTRFS_FS_REF_VERIFY=y


Best Regards,
Rong Chen


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