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Subject: [Bug python/28856] Python pretty printer causes stack overflow when
 printing frame arguments
Date: Mon, 21 Mar 2022 13:23:08 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28856

--- Comment #7 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gn=
u.org> ---
The master branch has been updated by Bruno Larsen <blarsen@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3Ddaaf7acf47a1=
2d10459060dca5500b63273cd683

commit daaf7acf47a12d10459060dca5500b63273cd683
Author: Bruno Larsen <blarsen@redhat.com>
Date:   Tue Feb 22 11:44:44 2022 -0300

    [gdb/testsuite] test a function call by hand from pretty printer

    The test case added here is testing the bug gdb/28856, where calling a
    function by hand from a pretty printer makes GDB crash. There are 6
    mechanisms to trigger this crash in the current test, using the commands
    backtrace, up, down, finish, step and continue. Since the failure happe=
ns
    because of use-after-free (more details below) the tests will always
    have a chance of passing through sheer luck, but anecdotally they seem
    to fail all of the time.

    The reason GDB is crashing is a use-after-free problem. The above
    mentioned functions save a pointer to the current frame's information,
    then calls the pretty printer, and uses the saved pointer for different
    reasons, depending on the function. The issue happens because
    call_function_by_hand needs to reset the obstack to get the current
    frame, invalidating the saved pointer.

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