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Message-ID: <20201029162057.GS534@brightrain.aerifal.cx>
Date: Thu, 29 Oct 2020 12:20:57 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Cc: Milan P. Stanić <mps@...anta.net>
Subject: Re: [PATCH v2] MT fork
On Thu, Oct 29, 2020 at 05:13:48PM +0100, Szabolcs Nagy wrote:
> * Milan P. Stanić <mps@...anta.net> [2020-10-29 00:06:10 +0100]:
> > On Wed, 2020-10-28 at 14:56, Rich Felker wrote:
> > > On Tue, Oct 27, 2020 at 05:17:35PM -0400, Rich Felker wrote:
> > > > > >
> > > > > > Will follow up with draft patch for testing.
> > > > >
> > > > > Patch attached. It should suffice for testing and review of whether
> > > > > there are any locks/state I overlooked. It could possibly be made less
> > > > > ugly too.
> > > > > [...]
> > > >
> > > > Another bug:
> > > > [...]
> > >
> > > And an updated version of the patch with both previously reported bugs
> > > fixed, for the purpose of users/distros wanting to test without
> > > manually fixing up the patch. Attached.
> >
> > Applied this patch on top of current musl master, build it on Alpine and
> > installed.
> >
> > Tested by building ruby lang. Works fine.
> > Also tested building zig lang, works fine.
> > But crystal lang builds fine, but running it hangs. strace shows:
> > -------------
> > [pid 5573] futex(0x7efc50fba9e4, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
> > [pid 5568] futex(0x7efc5118f984, FUTEX_REQUEUE_PRIVATE, 0, 1, 0x7efc514b67a4) = 1
> > [pid 5568] futex(0x7efc514b67a4, FUTEX_WAKE_PRIVATE, 1) = 1
> > [pid 5571] <... futex resumed>) = 0
> > [pid 5568] futex(0x7efc511099e4, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
> > [pid 5571] futex(0x7efc510409e4, FUTEX_WAIT_PRIVATE, 2, NULL
> > -------------
> > where it hangs.
>
> try to attach gdb to the process that hang and do
>
> thread apply all bt
Thanks -- I meant to reply to this earlier but forgot to.
> (make sure musl-dbg is installed)
If using a replacement musl, I think you'd just ensure it's built with
-g rather than relying on distro musl-dbg package, which will be for a
mismatched build/version.
Rich
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