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Re: [sh]: glibc file offset problems since 2.24

On Fri, Oct 21, 2016 at 08:16:31PM +0200, John Paul Adrian Glaubitz wrote:
> Hi!
> We have recently run into a rather odd regression with glibc on Debian/sh4.
> Starting with glibc 2.24, file offsets are apparently wrong which results
> into all weird side effects.
> One of these effects is that many applications error out with "File too large",
> for example firebird3.0 during build:
> sh -x -c "lockfile -1 /<<PKGBUILDDIR>>/gen/Release/firebird/bin/build-db.lock && /<<PKGBUILDDIR>>/gen/Release/firebird/bin/isql -q -i
> /<<PKGBUILDDIR>>/src/dbs/metadata.sql; res=\$?; rm -f /<<PKGBUILDDIR>>/gen/Release/firebird/bin/build-db.lock; exit \$res"
> + lockfile -1 /<<PKGBUILDDIR>>/gen/Release/firebird/bin/build-db.lock
> ERROR: ld.so: object 'libeatmydata.so' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
> + /<<PKGBUILDDIR>>/gen/Release/firebird/bin/isql -q -i /<<PKGBUILDDIR>>/src/dbs/metadata.sql
> can't format message 17:0 -- message file /usr/lib/sh4-linux-gnu/firebird/3.0/firebird.msg not found
> I/O error during "write" operation for file "/<<PKGBUILDDIR>>/gen/metadata.fdb"
> -Error while trying to write to file
> -File too large
> can't format message 17:120 -- message file /usr/lib/sh4-linux-gnu/firebird/3.0/firebird.msg not found
> + res=1
> + rm -f /<<PKGBUILDDIR>>/gen/Release/firebird/bin/build-db.lock
> + exit 1
> Or the systemd-journal:
> [   13.088000] systemd-journald[524]: Failed to create new system journal: File too large
> Another side effect is that mkfs does not work properly anymore since it writes the superblock
> at an incorrect offset. With a properly working glibc, the superblock is written at an offset
> of 0x400 while with the broken glibc (2.24), the superblock starts at 0x000. As a result,
> it's not possible to create a usable filesystem on affected machines:
> root@tirpitz:~> mkfs.ext4 /dev/sda2
> mke2fs 1.43.3 (04-Sep-2016)
> Suggestion: Use Linux kernel >= 3.18 for improved stability of the metadata and journal checksum features.
> Creating filesystem with 16252928 4k blocks and 4063232 inodes
> Filesystem UUID: 7d9bf1ee-a913-45d0-895b-4032020c1f3b
> Superblock backups stored on blocks:
>         32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
>         4096000, 7962624, 11239424
> Allocating group tables: done
> Writing inode tables: done
> Creating journal (65536 blocks): done
> Writing superblocks and filesystem accounting information: done
> root@tirpitz:~> blkid /dev/sda2
> /dev/sda2: PARTUUID="e6077cf7-02"
> root@tirpitz:~> mount /dev/sda2 /srv
> mount: wrong fs type, bad option, bad superblock on /dev/sda2,
>        missing codepage or helper program, or other error
>        In some cases useful info is found in syslog - try
>        dmesg | tail or so.
> root@tirpitz:~>
> Does anyone have a clue what could be the issue with glibc?

glibc commit 071af4769fcdfe2cd349157b01f27c9571478ace looks like a
likely culprit. It was between 2.23 and 2.24 and is related to this
musl commit which may be easier to understand:


I suspect glibc did the opposite change that was recently made in musl
and went from working->broken rather than broken->working.

Debugging this is complicated by the fact that qemu-sh4 is _wrong_,
i.e. mismatches the real kernel in the opposite direction, so if
someone tested on qemu they would find it working (or if they fixed it
on real hardware, you would find it broken on qemu). Someone should
file a qemu bug for this too but I haven't gotten around to it yet.


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