linux-kernel - [iov_iter] 2418c34937: Initiating_system

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Message-ID: <20210428023747.GA13086@xsang-OptiPlex-9020>
Date:   Wed, 28 Apr 2021 10:37:47 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-fsdevel@...r.kernel.org,
        lkp@...ts.01.org, lkp@...el.com
Subject: [iov_iter]  2418c34937: Initiating_system_reboot



Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: 2418c34937c42a30ef4bccd923ad664a89e1fbd4 ("iov_iter: optimize iov_iter_advance() for iovec and kvec")
https://git.kernel.org/cgit/linux/kernel/git/viro/vfs.git untested.iov_iter


in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+--------------------------+------------+------------+
|                          | c5f070c68e | 2418c34937 |
+--------------------------+------------+------------+
| boot_failures            | 0          | 11         |
| Initiating_system_reboot | 0          | 11         |
+--------------------------+------------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>



[   25.942407]     prompt_ramdisk=0
[   25.943148]     vga=normal
[   25.943836]     watchdog_thresh=240
[   26.029535] init: Console is alive
[   26.030789] init: - watchdog -
[   56.035061] softdog: Initiating system reboot

Kboot worker: lkp-worker13
Elapsed time: 60

kvm=(



as a contrast, this was not observed in parent, e.g.

[   13.467468]     prompt_ramdisk=0
[   13.467787]     vga=normal
[   13.468059]     watchdog_thresh=240
[   13.519759] init: Console is alive
[   13.520462] init: - watchdog -
[   13.526430] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[   13.527899] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[   13.529071] kmodloader (124) used greatest stack depth: 6708 bytes left
[   13.539875] init: - preinit -
... <keep going on after then>



To reproduce:

        # build kernel
	cd linux
	cp config-5.12.0-rc2-00003-g2418c34937c4 .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage

        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



---
0DAY/LKP+ Test Infrastructure                   Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org       Intel Corporation

Thanks,
Oliver Sang


View attachment "config-5.12.0-rc2-00003-g2418c34937c4" of type "text/plain" (123593 bytes)

View attachment "job-script" of type "text/plain" (4470 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (11368 bytes)