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From: Ariel Burbaickij <ariel DOT burbaickij AT gmail DOT com>
Date: Wed, 19 Oct 2022 08:20:35 +0200
Message-ID: <CANeJNHq1KMp71Be4=O5ofaGF_8Yu16L8N1WKzPb127jM-L33vw@mail.gmail.com>
Subject: Re: Debugging malloc crash in gdb
To: Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
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        David Allsopp <David DOT Allsopp AT cl DOT cam DOT ac DOT uk>
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Hello all,
I reported it already, of course as it happened to me but alas no reaction
so far.

Kind Regards
Ariel Burbaickij

On Tuesday, October 18, 2022, Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
wrote:

> On 18/10/2022 11:35, David Allsopp wrote:
>
>> I'm wondering if I may be able to have some pointers for debugging what
>> seems to be an unexpected interaction between mmap/mprotect/munmap and
>> malloc with the OCaml runtime.
>>
>> At the moment, I know that we crash in malloc, so my main question is how
>> to
>> go further in gdb. I installed the cygwin-debuginfo package, but all I'm
>> getting is:
>>
>
> Firstly, if the crash is inside the cygwin DLL, you must follow the advice
> in [1], and use 'set cygwin-exceptions on' to tell gdb to stop on an
> exception inside cygwin itself.
>
> [1] https://cygwin.com/faq.html#faq.programming.debugging-cygwin
>
>
> /cygdrive/d/a/scallywag/gdb/gdb-11.2-1.x86_64/src/gdb-11.2/
>> gdb/infrun.c:2550
>> : internal-error: void resume_1(gdb_signal): Assertion
>> `pc_in_thread_step_range (pc, tp)' failed.
>>
>
> This looks similar to the gdb crash reported [2], which I just don't have
> any time to look into.
>
> [2] https://cygwin.com/pipermail/cygwin/2022-June/251714.html
>
> I'd suggest reporting this as directed in https://www.sourceware.org/gdb
> /bugs/
>
> (Note that self-service account creation is disabled on the sourceware
> bugzilla, due to spam problems, so you need to mail overseers as directed
> there, to request a Sourceware Bugzilla account.)
>
> The reproduction case is below (it's the OCaml runtime, so it's not exactly
>> minimal, but it seems to be very repeatable to get gdb to the position of
>> the crash).
>>
>> [...]
>
>>
>> Any assistance to debug this further hugely appreciated!
>>
>
> It might be worth exploring if this gdb crash is seen in older versions of
> gcc, or with older gcc...
>
>
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