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bug#58923: Malformed core dumps on Guix System
From: |
Mathieu Othacehe |
Subject: |
bug#58923: Malformed core dumps on Guix System |
Date: |
Mon, 31 Oct 2022 11:23:48 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) |
Hello,
Working on https://issues.guix.gnu.org/58733, I noticed that there is
something wrong with the core dumps we are generating on Guix System.
--8<---------------cut here---------------start------------->8---
mathieu@meije ~/tmp [env]$ cat test.c
#include <stdio.h>
int main() {
int *t = NULL;
return *t;
}
mathieu@meije ~/tmp [env]$ gcc test.c
mathieu@meije ~/tmp [env]$ ulimit -c unlimited
mathieu@meije ~/tmp [env]$ ulimit -a
real-time non-blocking time (microseconds, -R) unlimited
core file size (blocks, -c) unlimited
mathieu@meije ~/tmp [env]$ echo "/tmp/my-core-%p" | sudo tee
/proc/sys/kernel/core_pattern
/tmp/my-core-%p
mathieu@meije ~/tmp [env]$ ./a.out
Segmentation fault (core dumped)
mathieu@meije ~/tmp [env]$ gdb ./a.out /tmp/my-core-5622
...
BFD: warning: /tmp/my-core-5622 has a segment extending past end of file
...
Failed to read a valid object file image from memory.
Core was generated by `./a.out'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x0000000000401102 in main ()
(gdb) bt
#0 0x0000000000401102 in main ()
Backtrace stopped: Cannot access memory at address 0x7fff14e14168
--8<---------------cut here---------------end--------------->8---
The "has a segment extending past end of file" warning appears to be
problematic and the "bt" command does not work which makes core dump
generation a bit useless.
Thanks,
Mathieu
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