Greeting,

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

commit: b216a023b9936afc5a2d979a4ba718073fdefe49 ("block: keep a block_device reference for each hd_struct")
git://git.infradead.org/users/hch/block.git bdev-inode


in testcase: mdadm-selftests
testcase version: mdadm-selftests-x86_64-5d518de-1_20200717
with following parameters:

	disk: 1HDD
	test_prefix: 07layout
	ucode: 0x21



on test machine: 4 threads Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz with 4G memory

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@intel.com>



2020-09-01 12:58:06 mkdir -p /var/tmp
2020-09-01 12:58:06 mke2fs -t ext3 -b 4096 -J size=4 -q /dev/sda3
2020-09-01 12:59:07 mount -t ext3 /dev/sda3 /var/tmp
sed -e 's/{DEFAULT_METADATA}/1.2/g' \
-e 's,{MAP_PATH},/run/mdadm/map,g'  mdadm.8.in > mdadm.8
/usr/bin/install -D -m 644 mdadm.8 /usr/share/man/man8/mdadm.8
/usr/bin/install -D -m 644 mdmon.8 /usr/share/man/man8/mdmon.8
/usr/bin/install -D -m 644 md.4 /usr/share/man/man4/md.4
/usr/bin/install -D -m 644 mdadm.conf.5 /usr/share/man/man5/mdadm.conf.5
/usr/bin/install -D -m 644 udev-md-raid-creating.rules /lib/udev/rules.d/01-md-raid-creating.rules
/usr/bin/install -D -m 644 udev-md-raid-arrays.rules /lib/udev/rules.d/63-md-raid-arrays.rules
/usr/bin/install -D -m 644 udev-md-raid-assembly.rules /lib/udev/rules.d/64-md-raid-assembly.rules
/usr/bin/install -D -m 644 udev-md-clustered-confirm-device.rules /lib/udev/rules.d/69-md-clustered-confirm-device.rules
/usr/bin/install -D  -m 755 mdadm /sbin/mdadm
/usr/bin/install -D  -m 755 mdmon /sbin/mdmon
Testing on linux-5.9.0-rc3-00066-gb216a023b9936 kernel
/lkp/benchmarks/mdadm-selftests/tests/07layouts... FAILED - see /var/tmp/07layouts.log and /var/tmp/fail07layouts.log for details



To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Rong Chen