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

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Date:   Mon, 9 Apr 2018 22:41:52 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ye Xiaolong <xiaolong.ye@...el.com>
Cc:     linux-kernel@...r.kernel.org, lkp@...org
Subject: Re: [lkp-robot] [init, tracing]  2580d6b795:
 BUG:kernel_reboot-without-warning_in_boot_stage

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.


> 
> >  
> >> 
> >> 
> >> 
> >> [    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?

-- Steve