From: Rain <glibc@sunshowers.io>
To: "Florian Weimer" <fweimer@redhat.com>,
"Adhemerval Zanella Netto" <adhemerval.zanella@linaro.org>
Cc: "Christian Brauner" <brauner@kernel.org>,
"Adhemerval Zanella Netto via Libc-help"
<libc-help@sourceware.org>
Subject: Re: posix_spawn: parent can get stuck in uninterruptible sleep if child receives SIGTSTP early enough
Date: Thu, 20 Oct 2022 18:40:41 -0700 [thread overview]
Message-ID: <1ccd76de-6d37-4e77-9142-c5c330bde8ca@app.fastmail.com> (raw)
In-Reply-To: <87zgdqd7zx.fsf@oldenburg.str.redhat.com>
On Thu, Oct 20, 2022, at 04:55, Florian Weimer wrote:
> * Adhemerval Zanella Netto:
>
>>> I don't think switching back to fork by default is really an option.
>>> The impact on latency is much worse than with vfork.
>>
>> I agree and I have been chatting with Christian if we can improve this
>> with some kernel support. My idea would to add a new clone3 argument
>> to define a signal mask and another options (either through clone3
>> itself or with a new execve variant) to setup the desired signal mask
>> after execve call.
>>
>> The first features is more an optimization to avoid the sigprocmask
>> (although I think we will need it anyway to proper reap the child if
>> the spawni fails), while the second feature should fix the issue
>> raised in this thread.
>
> But I think it would only work for SIGTSTP, not for SIGSTOP, right?
> But maybe SIGSTOP is sufficiently unusual that fixing SIGTSP on its own
> is already a welcome improvement.
From my perspective, fixing SIGTSTP is enough.
However, I do care about older versions of the Linux kernel and glibc,
as well as other operating systems, so I'll probably have to maintain
the double-process-spawn workaround indefinitely, sadly.
Thanks,
Rain
next prev parent reply other threads:[~2022-10-21 1:41 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-14 3:30 Rain
2022-08-14 3:38 ` Rain
2022-08-22 16:51 ` Adhemerval Zanella Netto
2022-08-22 17:00 ` Rain
2022-08-22 17:48 ` Adhemerval Zanella Netto
2022-08-22 18:21 ` Florian Weimer
2022-08-22 18:32 ` Adhemerval Zanella Netto
2022-08-22 22:28 ` Adhemerval Zanella Netto
2022-09-13 10:04 ` Florian Weimer
2022-09-21 15:24 ` Adhemerval Zanella Netto
2022-09-22 12:18 ` Florian Weimer
2022-09-22 16:56 ` Adhemerval Zanella Netto
2022-09-22 17:38 ` Florian Weimer
2022-09-22 19:14 ` Adhemerval Zanella Netto
2022-10-10 13:45 ` Florian Weimer
2022-10-18 20:04 ` Adhemerval Zanella Netto
2022-10-20 11:55 ` Florian Weimer
2022-10-21 1:40 ` Rain [this message]
2022-10-21 14:18 ` Szabolcs Nagy
2022-08-22 22:30 ` Adhemerval Zanella Netto
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1ccd76de-6d37-4e77-9142-c5c330bde8ca@app.fastmail.com \
--to=glibc@sunshowers.io \
--cc=adhemerval.zanella@linaro.org \
--cc=brauner@kernel.org \
--cc=fweimer@redhat.com \
--cc=libc-help@sourceware.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).