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From: "simark at simark dot ca" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/26754] Race condition when resuming threads and one does an exec
Date: Thu, 19 Nov 2020 23:55:37 +0000 [thread overview]
Message-ID: <bug-26754-4717-v09sEDQL6X@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-26754-4717@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=26754
--- Comment #9 from Simon Marchi <simark at simark dot ca> ---
(In reply to Pedro Alves from comment #8)
> >> I would prefer to preserve gdb thread id == 1 before / after exec,
> >> but that's a GDB concern, not a kernel interface concern.
> > I don't understand what you mean here.
>
> If we delete the zombie leader in reaction to PTRACE_EVENT_EXEC_BEGIN, then
> when we get the PTRACE_EVENT_EXEC, we'll create a new thread for the new
> leader, and that will end up with a GDB tid != 1.
>
> 1.1 main ()
> * 1.2 thread()
>
> and after exec we have:
>
> * 1.3 main ()
>
> I'm thinking that it would be better to end up with:
>
> * 1.1 main ()
>
> Similar to how if a non-threaded program execs, the main thread's thread
> number doesn't change.
Ah yeah of course, we definitely want that behavior. I don't fully understand
what you say (I would need to go study the code), but it doesn't matter right
now, it's all internal GDB bookkeeping.
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next prev parent reply other threads:[~2020-11-19 23:55 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-19 1:19 [Bug gdb/26754] New: " simark at simark dot ca
2020-10-19 1:20 ` [Bug gdb/26754] " simark at simark dot ca
2020-10-19 1:21 ` simark at simark dot ca
2020-11-19 20:05 ` palves at redhat dot com
2020-11-19 20:19 ` simark at simark dot ca
2020-11-19 21:32 ` simark at simark dot ca
2020-11-19 22:57 ` palves at redhat dot com
2020-11-19 23:11 ` simark at simark dot ca
2020-11-19 23:52 ` palves at redhat dot com
2020-11-19 23:55 ` simark at simark dot ca [this message]
2022-09-29 16:58 ` simark at simark dot ca
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