gdb reports a segfault in ld-linux.so.3 on armhf

[Michael Hudson-Doyle]

In an eoan armhf container on a disco arm64 vm:

root@helped-oyster:~# gdb /bin/true
GNU gdb (Ubuntu 8.3-0ubuntu1) 8.3
...
(gdb) r
Starting program: /usr/bin/true

Program received signal SIGSEGV, Segmentation fault.
0xf7fc8ee0 in ?? () from /lib/ld-linux-armhf.so.3

It happens in a disco container too.

[Michael Hudson-Doyle (mwhudson)]

I don't really know what is happening here but I suspect pretty strongly it's related to systemtap static probes, because if I do this:

root@helped-oyster:~# cp /lib/ld-linux-armhf.so.3 .
root@helped-oyster:~# objcopy -R .note.stapsdt ld-linux-armhf.so.3 ld-linux-armhf.so.3-nostap
root@helped-oyster:~# gdb --args ./ld-linux-armhf.so.3-nostap /bin/true

Everything behaves as expected. I can't find a command line option to disable systemtap probes, which seems a bit of a strange choice...

[Dimitri John Ledkov (xnox)]

And the VM in question has an arm64 kernel right? Have you tried an armhf kernel?

[Michael Hudson-Doyle (mwhudson)]

No.

[Michael Hudson-Doyle (mwhudson)]

I finally got around to reporting this upstream as https://sourceware.org/bugzilla/show_bug.cgi?id=25215

[Steve Langasek (vorlon)]

Adding a task on gdb so I can find this bug again in 2 months the next time I need to remember how to work around it.