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Date:   Wed, 29 May 2019 10:52:56 +0800
From:   kernel test robot <>
To:     Jan Kara <>
Cc:     Theodore Ts'o <>, Ira Weiny <>,
        LKML <>,
        Stephen Rothwell <>,,
Subject: [ext4] 079f9927c7:

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

commit: 079f9927c7bfa026d963db1455197159ebe5b534 ("ext4: gracefully handle ext4_break_layouts() failure during truncate") 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.

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 <>

tag=mmap16 stime=1559078706
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!
duration=8 termination_type=exited termination_id=1 corefile=no
cutime=11 cstime=345

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
        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

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)

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