musl - Re: aio_cancel segmentation fault for in progress write requests

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Message-ID: <87h8fpaypx.fsf@oldenburg2.str.redhat.com>
Date: Fri, 07 Dec 2018 21:06:18 +0100
From: Florian Weimer <fweimer@...hat.com>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: aio_cancel segmentation fault for in progress write requests

* Rich Felker:

> I don't think so. I'm concerned that it's a stack overflow, and that
> somehow the kernel folks have managed to break the MINSIGSTKSZ ABI.

Probably:

  <https://sourceware.org/bugzilla/show_bug.cgi?id=20305>
  <https://sourceware.org/bugzilla/show_bug.cgi?id=22636>

It's a nasty CPU backwards compatibility problem.  Some of the
suggestions I made to work around this are simply wrong; don't take them
too seriously.

Nowadays, the kernel has a way to disable the %zmm registers, but it
unfortunately does not reduce the save area size.

Thanks,
Florian

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