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From: "plasmahh at gmx dot net" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug python/28620] New: logging/output redirect interaction between
 python and stepping commands is broken (and sometimes segfaults)
Date: Tue, 23 Nov 2021 09:37:56 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28620

            Bug ID: 28620
           Summary: logging/output redirect interaction between python and
                    stepping commands is broken (and sometimes segfaults)
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: plasmahh at gmx dot net
  Target Milestone: ---

Tried with todays HEAD too.

While developing my python plugin I noticed that output redirection of step=
ping
commands does not work in python (e.g. gdb.execute("si",False,True). Since =
all
I needed at that point was supressing the output, I tried using the logging
redirect mechanism and things crashed on me.

To reproduce, start any program within gdb (-nh) to a point where stepping =
is
possible. Then do

python for c in "set logging redirect on\nset logging on\nsi".splitlines():
gdb.execute(c,False,True)

and after that=20

set logging off


This will reliably segfault for me (and some others on IRC too)

Further I noticed that when doing=20

set logging redirect on
set logging on
si
set logging off
python gdb.execute("set logging on",False,True)

and then do a=20

show logging

Half of the output goes to the redirected file, and half of  it is displaye=
d on
the terminal (the prefix for each entry that is)

A "set logging off" after that will crash too.

--=20
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