linux-kernel - [LKP] [vfs] 496635b65e: BUG:kernel_hang_in_boot

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Date:   Wed, 7 Nov 2018 08:38:29 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, lkp@...org
Subject: [LKP] [vfs] 496635b65e: BUG:kernel_hang_in_boot_stage

FYI, we noticed the following commit (built with gcc-7):

commit: 496635b65e7825cf09820de0de19514e1901ea78 ("vfs: Implement a filesystem superblock creation/configuration context")
https://git.kernel.org/cgit/linux/kernel/git/viro/vfs.git N0

in testcase: cpu-hotplug
with following parameters:




on test machine: qemu-system-i386 -enable-kvm -smp 2 -m 512M

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


+---------------------------------------------------------+------------+------------+
|                                                         | 6718c3d626 | 496635b65e |
+---------------------------------------------------------+------------+------------+
| boot_successes                                          | 8          | 0          |
| boot_failures                                           | 4          | 14         |
| invoked_oom-killer:gfp_mask=0x                          | 4          |            |
| Mem-Info                                                | 4          |            |
| Out_of_memory:Kill_process                              | 4          |            |
| Out_of_memory_and_no_killable_processes                 | 3          |            |
| Kernel_panic-not_syncing:System_is_deadlocked_on_memory | 3          |            |
| BUG:kernel_hang_in_boot_stage                           | 0          | 14         |
+---------------------------------------------------------+------------+------------+



[    0.677663] Smack:  Initializing.
[    0.678384] Smack:  IPv6 port labeling enabled.
[    0.678783] AppArmor: AppArmor disabled by boot time parameter
[    0.680133] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.682088] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
BUG: kernel hang in boot stage

Elapsed time: 500

#!/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



Thanks,
lkp

View attachment "config-4.20.0-rc1-00013-g496635b" of type "text/plain" (148990 bytes)

View attachment "job-script" of type "text/plain" (3932 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (5688 bytes)