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* [Bug mi/28988] New: GDB crashes when using GDB/MI and python pretty printers in some cases
@ 2022-03-22 12:29 jan at vrany dot io
2022-03-22 13:31 ` [Bug mi/28988] " simon.marchi at polymtl dot ca
2022-03-22 13:37 ` jan at vrany dot io
0 siblings, 2 replies; 3+ messages in thread
From: jan at vrany dot io @ 2022-03-22 12:29 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28988
Bug ID: 28988
Summary: GDB crashes when using GDB/MI and python pretty
printers in some cases
Product: gdb
Version: HEAD
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: mi
Assignee: unassigned at sourceware dot org
Reporter: jan at vrany dot io
Target Milestone: ---
Created attachment 14031
--> https://sourceware.org/bugzilla/attachment.cgi?id=14031&action=edit
A transcript of commands that produced the crash
After updating my every-day-use GDB to commit
commit c9178f285acf19e066be8367185d52837161b0a2 (HEAD -> master, origin/master)
Author: Alan Modra <amodra@gmail.com>
Date: Thu Mar 17 20:05:39 2022 +1030
I'm experiencing GDB to crash on assertion failure in value_copy
(value.c:1731).
This is triggered when I single-step through code while having (my, custom)
GDB/MI
frontent displaying local variables with python pretty printers enabled.
For example: doing this in frontend triggers the assertion failure:
file gdb/testsuite/outputs/gdb.python/py-prettyprint/py-prettyprint-cxx
source gdb/testsuite/outputs/gdb.python/py-prettyprint/py-prettyprint.py
b add_item(container*, int)
r
dis 1
fin
n
n (few more times until it crashes)
This is the backtrace when it crashes:
/home/jv/Proj...atches/gdb/gdb [stopped]
Thread 1 [stopped] "gdb"
0 0x0000556077ADABD0 internal_error (errors.cc:51)
1 0x00005560776148A7 value_copy (value.c:1731)
2 0x0000556077360028 gdbpy_get_varobj_pretty_printer
(py-prettyprint.c:655)
3 0x0000556077620E60 install_default_visualizer (varobj.c:1056)
4 0x00005560776210E9 install_new_value_visualizer (varobj.c:1127)
5 0x00005560776218B2 install_new_value (varobj.c:1339)
6 0x000055607761F6FB varobj_create (varobj.c:378)
7 0x0000556077245C05 mi_cmd_var_create (mi-cmd-var.c:132)
8 0x0000556077249F2B mi_command_mi::invoke (mi-cmds.c:58)
9 0x0000556077264F15 mi_cmd_execute (mi-main.c:2091)
10 0x000055607726450C captured_mi_execute_command (mi-main.c:1823)
11 0x000055607726498A mi_execute_command (mi-main.c:1947)
12 0x000055607724D21B mi_execute_command_wrapper (mi-interp.c:285)
13 0x000055607724D2A4 mi_execute_command_input_handler
(mi-interp.c:314)
14 0x00005560770D7149 gdb_readline_no_editing_callback
(event-top.c:878)
15 0x00005560770D6948 stdin_event_handler (event-top.c:524)
16 0x0000556077ADB57E gdb_wait_for_event (event-loop.cc:700)
17 0x0000556077ADB7FB gdb_wait_for_event (event-loop.cc:596)
18 0x0000556077ADB7FB gdb_do_one_event (event-loop.cc:237)
19 0x000055607721BA1B start_event_loop (main.c:421)
20 0x000055607721BB3F captured_command_loop (main.c:481)
21 0x000055607721D535 captured_main (main.c:1351)
22 0x000055607721D59B gdb_main (main.c:1366)
23 0x0000556076DA7E93 main (gdb.c:32)
Thread 2 [stopped] "gdb worker"
Thread 3 [stopped] "gdb worker"
Thread 4 [stopped] "gdb worker"
Thread 5 [stopped] "gdb worker"
Unfortunately, so far I was unable to reproduce this outside my frontend. I
tried
to simulate what the frontend does (see attached file), but running GDB like
gdb -i mi < crash-in-value_copy-reproducer.txt
does not trigger it (arguably, the frontend issues silly / unnecessary MI
commands, but still
it should not crash GDB - I would think :-).
If I revert commit
commit 5f8ab46bc6918efb678deb5956c033e466afe301
Author: Simon Marchi <simon.marchi@polymtl.ca>
Date: Mon Jan 31 15:57:58 2022 -0500
gdb: constify parameter of value_copy
Everything seems to work just fine for me. I'm not at all familiar with this
part of the GDB code so I do not know whether this change is the real culprit
or not, let alone to explain why.
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* [Bug mi/28988] GDB crashes when using GDB/MI and python pretty printers in some cases
2022-03-22 12:29 [Bug mi/28988] New: GDB crashes when using GDB/MI and python pretty printers in some cases jan at vrany dot io
@ 2022-03-22 13:31 ` simon.marchi at polymtl dot ca
2022-03-22 13:37 ` jan at vrany dot io
1 sibling, 0 replies; 3+ messages in thread
From: simon.marchi at polymtl dot ca @ 2022-03-22 13:31 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28988
Simon Marchi <simon.marchi at polymtl dot ca> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |simon.marchi at polymtl dot ca
--- Comment #1 from Simon Marchi <simon.marchi at polymtl dot ca> ---
Hannes has already opened a bug for this:
https://sourceware.org/bugzilla/show_bug.cgi?id=28980
I'd mark this one as a duplicate, but it seems I don't have permissions.
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* [Bug mi/28988] GDB crashes when using GDB/MI and python pretty printers in some cases
2022-03-22 12:29 [Bug mi/28988] New: GDB crashes when using GDB/MI and python pretty printers in some cases jan at vrany dot io
2022-03-22 13:31 ` [Bug mi/28988] " simon.marchi at polymtl dot ca
@ 2022-03-22 13:37 ` jan at vrany dot io
1 sibling, 0 replies; 3+ messages in thread
From: jan at vrany dot io @ 2022-03-22 13:37 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=28988
Jan Vrany <jan at vrany dot io> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #2 from Jan Vrany <jan at vrany dot io> ---
Ah, that explains my confusion when creating this one. Closing as duplicate
indeed.
*** This bug has been marked as a duplicate of bug 28980 ***
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2022-03-22 12:29 [Bug mi/28988] New: GDB crashes when using GDB/MI and python pretty printers in some cases jan at vrany dot io
2022-03-22 13:31 ` [Bug mi/28988] " simon.marchi at polymtl dot ca
2022-03-22 13:37 ` jan at vrany dot io
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