Re: Another possible LTO failure in guestfish (or maybe readline)

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* Richard W. M. Jones:

> Here's another one:
>
>   $ rpm -qf /usr/bin/guestfish /lib64/libreadline.so.8
>   libguestfs-tools-c-1.43.1-2.fc33.x86_64
>   readline-8.0-5.fc33.x86_64
>   $ guestfish --version
>   Segmentation fault (core dumped)
>
>   (gdb) bt
>   #0  0x0000000000000000 in  ()
>   #1  0x00007f3212b72dad in history_filename
>       (filename=0x5592dd41bfa0 "/home/rjones/.guestfish") at ../histfile.c:152
>   #2  0x00007f3212b75e2d in read_history_range
>       (filename=<optimized out>, from=0, to=-1) at ../histfile.c:280
>   #3  0x00005592dd33e646 in main ()
>
> It also caused a build failure of another package in Koji
> (search the logs for "ext2.img] Segmentation fault (core dumped)"):
>
>   https://koji.fedoraproject.org/koji/taskinfo?taskID=48245041
>
> I suspect the problem isn't in readline but is in the main package,
> mainly because I tried an older readline and that failed in the same
> way.

This looks like the ld bug producing incorrect absolute symbols:

$ eu-readelf --symbols=.dynsym usr/bin/guestfish  | grep -w ABS
  790: 0000000000000000     54 FUNC    GLOBAL DEFAULT      ABS xrealloc
  791: 0000000000000000     35 FUNC    GLOBAL DEFAULT      ABS xmalloc
  799: 0000000000000000   1294 FUNC    GLOBAL DEFAULT      ABS locale_charset

<https://sourceware.org/bugzilla/show_bug.cgi?id=26314>

I believe a fix for that is on its way to rawhide.

Thanks,
Florian
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