linux-kernel - [ext4] 079f9927c7: ltp.mmap16.fail

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Date:   Wed, 29 May 2019 10:52:56 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Jan Kara <jack@...e.cz>
Cc:     Theodore Ts'o <tytso@....edu>, Ira Weiny <ira.weiny@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org,
        ltp@...ts.linux.it
Subject: [ext4] 079f9927c7: ltp.mmap16.fail

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

commit: 079f9927c7bfa026d963db1455197159ebe5b534 ("ext4: gracefully handle ext4_break_layouts() failure during truncate")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: ltp
with following parameters:

	disk: 1HDD
	fs: xfs
	test: syscalls_part2

test-description: The LTP testsuite contains a collection of tools for testing the Linux kernel and related features.
test-url: http://linux-test-project.github.io/


on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G

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


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

<<<test_start>>>
tag=mmap16 stime=1559078706
cmdline="mmap16"
contacts=""
analysis=exit
<<<test_output>>>
mke2fs 1.43.4 (31-Jan-2017)
mmap16      0  TINFO  :  Using test device LTP_DEV='/dev/loop0'
mmap16      0  TINFO  :  Formatting /dev/loop0 with ext4 opts='-b 1024' extra opts='10240'
mmap16      1  TFAIL  :  mmap16.c:85: Bug is reproduced!
<<<execution_status>>>
initiation_status="ok"
duration=8 termination_type=exited termination_id=1 corefile=no
cutime=11 cstime=345
<<<test_end>>>




To reproduce:

        # build kernel
	cd linux
	cp config-5.1.0-rc3-00039-g079f992 .config
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 bzImage


        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
	bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email




Thanks,
Rong Chen


View attachment "config-5.1.0-rc3-00039-g079f992" of type "text/plain" (188903 bytes)

View attachment "job-script" of type "text/plain" (5157 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (73368 bytes)

View attachment "ltp" of type "text/plain" (248230 bytes)