linux-kernel - Re: [lkp-robot] [init, tracing] 2580d6b795: BUG:kernel_reboot-without-warning_in_boot

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Date:   Tue, 10 Apr 2018 11:14:01 +0800
From:   Ye Xiaolong <xiaolong.ye@...el.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, lkp@...org
Subject: Re: [lkp-robot] [init, tracing]  2580d6b795:
 BUG:kernel_reboot-without-warning_in_boot_stage

On 04/09, Steven Rostedt wrote:
>On Tue, 10 Apr 2018 09:23:40 +0800
>Ye Xiaolong <xiaolong.ye@...el.com> wrote:
>
>> Hi, Steven
>> 
>> On 04/09, Steven Rostedt wrote:
>> >On Mon, 9 Apr 2018 13:32:52 +0800
>> >kernel test robot <xiaolong.ye@...el.com> wrote:
>> >  
>> >> FYI, we noticed the following commit (built with gcc-7):
>> >> 
>> >> commit: 2580d6b795e25879c825a0891cf67390f665b11f ("init, tracing: Have printk come through the trace events for initcall_debug")
>> >> url: https://github.com/0day-ci/linux/commits/Steven-Rostedt/init-tracing/20180407-130743
>> >> 
>> >> 
>> >> in testcase: boot
>> >> 
>> >> on test machine: qemu-system-x86_64 -enable-kvm -cpu Nehalem -smp 2 -m 512M
>> >> 
>> >> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>> >> 
>> >> 
>> >> +------------------------------------------------------------------+------------+------------+
>> >> |                                                                  | ecf6709d07 | 2580d6b795 |
>> >> +------------------------------------------------------------------+------------+------------+
>> >> | boot_successes                                                   | 0          | 0          |
>> >> | boot_failures                                                    | 8          | 8          |
>> >> | invoked_oom-killer:gfp_mask=0x                                   | 8          |            |
>> >> | Mem-Info                                                         | 8          |            |
>> >> | Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 8          |            |
>> >> | BUG:kernel_reboot-without-warning_in_boot_stage                  | 0          | 8          |
>> >> +------------------------------------------------------------------+------------+------------+  
>> >
>> >What does this mean?  
>> 
>> It means BUG:BUG:kernel_reboot-without-warning_in_boot_stage occurred 8 times
>> in boot tests for commit 2580d6b795, while 0 time for its parent ecf6709d07.
>
>I don't have a commit 2580d6b795.
>
>The commit with the title "init, tracing: Have printk come through the
>trace events for initcall_debug" is 4e37958d1288ce. linux-next doesn't
>have that commit sha1 either.

This commit was generated by 0day service, it captured your email patchset which posted
on LKML and then applied it on top of 06dd3dfeea60 and performed build/boot tests accordingly.

>
>
>> 
>> >  
>> >> 
>> >> 
>> >> 
>> >> [    0.000000] RAMDISK: [mem 0x1b7e2000-0x1ffcffff]
>> >> [    0.000000] ACPI: Early table checksum verification disabled
>> >> [    0.000000] ACPI: RSDP 0x00000000000F6860 000014 (v00 BOCHS )
>> >> [    0.000000] ACPI: RSDT 0x000000001FFE1628 000030 (v01 BOCHS  BXPCRSDT 00000001 BXPC 00000001)
>> >> [    0.000000] ACPI: FACP 0x000000001FFE147C 000074 (v01 BOCHS  BXPCFACP 00000001 BXPC 00000001)
>> >> BUG: kernel reboot-without-warning in boot stage
>> >> 
>> >> Elapsed time: 10
>> >> 
>> >> #!/bin/bash
>> >> 
>> >> 
>> >> 
>> >> To reproduce:
>> >> 
>> >>         git clone https://github.com/intel/lkp-tests.git
>> >>         cd lkp-tests
>> >>         bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email
>> >>   
>> >
>> >The config boots fine for me. But I don't have the setup to run the
>> >above and get it to work, nor the time to figure out why it doesn't
>> >work.  
>> 
>> Could you paste your failure log here, we can see if there is something we can help.
>
>I tried it on a more up-to-date box, after checking out my commit with
>the title you say is an error. I compiled your config with gcc (GCC)
>7.3.1 20180130 (Red Hat 7.3.1-2), and ran the above (which did work).
>It ended after it got to a login prompt.
>
>---
>[..]
>[   10.588029] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
>[   10.589363] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
>[   10.590385] cfg80211: failed to load regulatory.db
>[   10.610002] Freeing unused kernel memory: 1980K
>[   10.610533] Write protecting the kernel read-only data: 49152k
>[   10.615728] Freeing unused kernel memory: 2028K
>[   10.620754] Freeing unused kernel memory: 464K
>INIT: version 2.88 booting
>/etc/rcS.d/S00fbsetup: line 3: /sbin/modprobe: not found
>
>Please wait: booting...
>[   10.676861] rc (151) used greatest stack depth: 27848 bytes left
>Starting udev
>[   10.750281] udevd[175]: starting version 3.1.5
>[   10.759923] udevd (175) used greatest stack depth: 27696 bytes left
>[   11.129999] udevadm (178) used greatest stack depth: 26696 bytes left
>Populating dev cache
>INIT: Entering runlevel: 5
>Configuring network interfaces... done.
>Starting syslogd/klogd: done
>
>Poky (Yocto Project Reference Distro) 2.1 qemux86-64 /dev/ttyS0
>
>qemux86-64 login:
>---
>
>What am I suppose to see?
>

So I figure the gap may be 0day bot applied your patchset to a inappropriate base. 

Thanks,
Xiaolong
>-- Steve
>