[Bug gdb/30205] New: [qemu-gdbserver -- i386] Gdb crash while debugging the pintos kernel, some kind of readline issue?

[Bug gdb/30205] New: [qemu-gdbserver -- i386] Gdb crash while debugging the pintos kernel, some kind of readline issue?

[liam.naddell at mail dot utoronto.ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=30205

            Bug ID: 30205
           Summary: [qemu-gdbserver -- i386] Gdb crash while debugging the
                    pintos kernel, some kind of readline issue?
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: liam.naddell at mail dot utoronto.ca
  Target Milestone: ---

Created attachment 14735
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14735&action=edit
analysis of the coredump

While I was debugging the pintos kernel for a school assignment, I ran into a
GDB crash. Specifically, I ran a macro called dumplist (macro file attached,
loaded via gdb -x). This macro prints out all the contents of a janky dynamic
list implementation in kernel memory. 


Actual result
---------------

I got a coredump file back, and ran a backtrace + looked around the call stack.
It looks like the error has something to do with readline. My log of going
through the gdb coredump is attached.


Expected result
---------------

N/A gdb shouldn't crash ever even with stupid macros or stupid data


Environment details
-------------------

OS: archlinux
project code: https://github.com/liamnaddell/CSCC69-Pintos
libc version: core/glibc 2.37-2 [installed]
qemu version: extra/qemu-system-x86 7.2.0-3 [installed]
gdb version: GNU gdb (GDB) 12.1
gdb configuration: 
   configure --host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
             --with-auto-load-dir=$debugdir:$datadir/auto-load
             --with-auto-load-safe-path=$debugdir:$datadir/auto-load
             --with-expat
             --with-gdb-datadir=/usr/share/gdb (relocatable)
             --with-jit-reader-dir=/usr/lib/gdb (relocatable)
             --without-libunwind-ia64
             --with-lzma
             --without-babeltrace
             --without-intel-pt
             --with-mpfr
             --without-xxhash
             --with-python=/usr (relocatable)
             --with-python-libdir=/usr/lib (relocatable)
             --with-debuginfod
             --with-guile
             --enable-source-highlight
             --with-separate-debug-dir=/usr/lib/debug (relocatable)
             --with-system-gdbinit=/etc/gdb/gdbinit

gcc version: 12.1

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[Bug gdb/30205] [qemu-gdbserver -- i386] Gdb crash while debugging the pintos kernel, some kind of readline issue?

[liam.naddell at mail dot utoronto.ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=30205

--- Comment #1 from Liam Naddell <liam.naddell at mail dot utoronto.ca> ---
Created attachment 14736
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14736&action=edit
gdb-macros file loaded via gdb -x

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[Bug gdb/30205] [qemu-gdbserver -- i386] Gdb crash while debugging the pintos kernel, some kind of readline issue?

[liam.naddell at mail dot utoronto.ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=30205

--- Comment #2 from Liam Naddell <liam.naddell at mail dot utoronto.ca> ---
Created attachment 14737
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14737&action=edit
Output from gdb after the crash (sorry for the png)

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[Bug gdb/30205] [qemu-gdbserver -- i386] Gdb crash while debugging the pintos kernel, some kind of readline issue?

[liam.naddell at mail dot utoronto.ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=30205

--- Comment #3 from Liam Naddell <liam.naddell at mail dot utoronto.ca> ---
forgot to mention in original report: I haven't been able to reproduce this
issue since coming across it

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[Bug gdb/30205] [qemu-gdbserver -- i386] Gdb crash while debugging the pintos kernel, some kind of readline issue?

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30205

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at sourceware dot org

--- Comment #4 from Tom Tromey <tromey at sourceware dot org> ---
Thank you for the bug report.

I'm not sure there is really enough information here to diagnose it.
Lack of reproducibility may also be an issue.
Anyway, my first suggestion would be to build a '-g -O0' gdb in
order to get a more reliable stack trace if it does happen again.

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[Bug gdb/30205] [qemu-gdbserver -- i386] Gdb crash while debugging the pintos kernel, some kind of readline issue?

[liam.naddell at mail dot utoronto.ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=30205

--- Comment #5 from Liam Naddell <liam.naddell at mail dot utoronto.ca> ---
If I run into it again, I am now using a debug gdb, I'll add it to this ticket

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