On Tue, May 23, 2017 at 06:41:48PM +0100, Marc Thomas wrote: > Hi Ted, > > Firstly, thank-you for taking the time to look into this. > > I have modified your script with a "test-case" which fails for me every > time, as I noticed there is a file created by a Linux kernel build which > exhibits the problem (arch/x86/realmode/rm/realmode.bin) I think any > kernel version 3.10.x on x86_64 ought to work. I've also included a few > extra steps which I'm doing as part of the ext3 to ext4 conversion, and > added the "-b" (binary) flag to md5sum. > > Here's the script. I'm not sure if it counts as a "simple" repro! :) Aha! There is a bug in e2fsck's bmap2extent converter that merges bmap records that are physically but not logically contiguous. I will produce a patch + testcase shortly. --D > > > ----- cut here ----- > #!/bin/bash > > rm -f /tmp/foo.img > mke2fs -t ext3 -Fq /tmp/foo.img 5G > mount -o loop /tmp/foo.img /mnt > dd if=/etc/motd of=/mnt/test bs=4k >& /dev/null > dd if=/etc/motd of=/mnt/test conv=notrunc seek=32 bs=4k >& /dev/null > dd if=/etc/motd of=/mnt/test2 bs=4k >& /dev/null > dd if=/etc/motd of=/mnt/test2 conv=notrunc seek=1024 bs=4k >& /dev/null > md5sum -b /mnt/test* > /mnt/MD5SUMS > lsattr /mnt/test* > ( cd /mnt > xz -dc ~marc/LinuxStuff/Linux4.x/linux-4.11.1.tar.xz | tar xvf - > cd linux-4.11.1 > make defconfig > time make -j 15 ) > /dev/null 2>&1 > md5sum -b /mnt/linux-4.11.1/arch/x86/realmode/rm/realmode.bin >> > /mnt/MD5SUMS > lsattr /mnt/linux-4.11.1/arch/x86/realmode/rm/realmode.bin > umount /mnt > tune2fs -O extents,uninit_bg,dir_index /tmp/foo.img > e2fsck -fy /tmp/foo.img > e2fsck -fy -E bmap2extent /tmp/foo.img > mount -o loop /tmp/foo.img /mnt > md5sum -c /mnt/MD5SUMS > lsattr /mnt/test* > lsattr /mnt/linux-4.11.1/arch/x86/realmode/rm/realmode.bin > umount /mnt > ----- cut here ----- > > > The output of the script is: > > time ./marc2.sh > ------------------- /mnt/test > ------------------- /mnt/test2 > ------------------- /mnt/linux-4.11.1/arch/x86/realmode/rm/realmode.bin > tune2fs 1.43.4 (31-Jan-2017) > e2fsck 1.43.4 (31-Jan-2017) > Pass 1: Checking inodes, blocks, and sizes > Pass 2: Checking directory structure > Pass 3: Checking directory connectivity > Pass 4: Checking reference counts > Pass 5: Checking group summary information > /tmp/foo.img: 71184/327680 files (6.4% non-contiguous), 338237/1310720 > blocks > e2fsck 1.43.4 (31-Jan-2017) > Pass 1: Checking inodes, blocks, and sizes > Pass 1E: Optimizing extent trees > Pass 2: Checking directory structure > Pass 3: Checking directory connectivity > Pass 4: Checking reference counts > Pass 5: Checking group summary information > > /tmp/foo.img: ***** FILE SYSTEM WAS MODIFIED ***** > /tmp/foo.img: 71184/327680 files (6.4% non-contiguous), 334994/1310720 > blocks > /mnt/test: OK > /mnt/test2: OK > /mnt/linux-4.11.1/arch/x86/realmode/rm/realmode.bin: FAILED > md5sum: WARNING: 1 computed checksum did NOT match > --------------e---- /mnt/test > --------------e---- /mnt/test2 > --------------e---- /mnt/linux-4.11.1/arch/x86/realmode/rm/realmode.bin > > real 1m46.829s > user 17m41.611s > sys 1m39.268s > > Thanks & Kind Regards, > Marc > >
