Re: [ptxdist] Segmentation fault with ptxdist-2020.05.0

[Michael Olbrich <m.olbrich@pengutronix.de>]

On Thu, May 14, 2020 at 03:36:44PM +0200, Mircea Ciocan wrote:
> Hello list,
> 
> I have the most strange error with the ptxdist-2020.05.0 while trying to
> compile a simple image for the iMX6ULL EVK, the shell segfaults !!!
> 
> Here are some information, that you could find useful:
> 
> Distribution: Ubuntu 18.04 LTS, 8GB RAM, current updates.
> 
> System shell set to bash.
> 
> The compilation of everything goes perfectly OK, but while building the root
> filesystem image it crashes, always in the same place (100% reproducible),
> when adding the net-dns-perl package, with the following message;
> 
> info: selected ptxconfig:
>       'configs/platform-mcimx6ull-evk/ptxconfig.tiny'
> ptxdist: warning: No dev packages found in 'Firmware/packages-MCIMX6ULL-EVK'
> 
> ...[snip]...
> 
> [compilation goes OK]
> 
> ----------------
> target: root.tgz
> ----------------
> ...[snip]...
> 
> Configuring readline.
> Configuring net-dns-perl.
> environment: line 1: 31523 Done                    { echo "cd '${work_dir}'
> || exit"; ptxd_dopermissions "${ptxd_reply_perm_files[@]}"; echo ":"; }
>      31524 Segmentation fault      (core dumped) | sh
> ./Software/ptxdist-2020.05.0/rules/image-root-tgz.make:29: recipe for target
> './Software/Firmware/platform-MCIMX6ULL-EVK/images/root.tgz' failed
> 
> make: *** [./Software/Firmware/platform-MCIMX6ULL-EVK/images/root.tgz] Error
> 139
> 
> 
> In the system log I get something like:
> 
> "vmunix: [132753.581596] sh[10747]: segfault at 7ffe5bdf1fe8 ip
> 00007fdb0b04930e sp 00007ffe5bdf1fe0 error 6 in
> libc-2.27.so[7fdb0afb5000+1e7000]"
> 
> 
> I have to say that I rarely, if ever, see this type of crash, and the build
> finishes OK with ptxdist-2020.02.0. Any pointer on how can I fix or debug
> this are greatly appreciated.

Huh, I've never seen anything like this. Some things to test.

Take a look at scripts/lib/ptxd_make_image_prepare_work_dir.sh in PTXdist.
The relevant code is there. Line 50ff.
If you change line 56 to something like this:

} | tee /tmp/ptxdist-sh-test.txt | sh &&

Then this will save the exact code that the shell executes when it crashed.
Maybe we can find some clues there. But It's probably a bug in 'sh'.

What's your /bin/sh anyways? For me it's a link to 'dash' but sometimes
it's a bash. You could explicitly try the other here instead of 'sh' to see
if that crashes as well.

Michael

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