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From: Florian Weimer <fweimer@redhat.com>
To: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Cc: Christian Brauner <brauner@kernel.org>,
	 Adhemerval Zanella Netto via Libc-help
	<libc-help@sourceware.org>,  Rain <glibc@sunshowers.io>
Subject: Re: posix_spawn: parent can get stuck in uninterruptible sleep if child receives SIGTSTP early enough
Date: Thu, 20 Oct 2022 13:55:46 +0200	[thread overview]
Message-ID: <87zgdqd7zx.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <47b750c6-f05c-2538-114d-3799628ebf56@linaro.org> (Adhemerval Zanella Netto's message of "Tue, 18 Oct 2022 17:04:29 -0300")

* 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.

Thanks,
Florian


  reply	other threads:[~2022-10-20 11:55 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 [this message]
2022-10-21  1:40                             ` Rain
2022-10-21 14:18                               ` Szabolcs Nagy
2022-08-22 22:30       ` Adhemerval Zanella Netto

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