Bug#903514: Deadlock in _dl_close join-ing threads accessing TLS (was Re: gimp won't launch)

[James Van Zandt]

Awesome, thanks!

On Fri, Aug 10, 2018, 5:27 PM Alexis Murzeau <amubtdx at gmail.com> wrote:

> On 09/08/2018 00:22, Alexis Murzeau wrote:
> > On 08/08/2018 00:59, Alexis Murzeau wrote:
> >> severity 903514 important
> >> thanks
> >>
> >>> Reassigning to glibc with affects on openblas and gimp as this is
> caused
> >>> by a deadlock inside glibc.
> >>
> >> Done.
> >>
> >> Lowering severity as this does not render any package unusable by
> >> themselves, but only a combination of them (GIMP + OpenBLAS).
> >>
> >> I think a workaround solution against GIMP OpenBLAS should be done as
> >> I'm not sure a good solution will emerge in glibc given attempts done in
> >> the past. The work to be done seems non trivial.
> >>
> >> My though on possible solutions:
> >>  * Add a breaks between GIMP and OpenBLAS
> >>  * Disable TLS in OpenBLAS build (if possible, but this would cause a
> >> performance loss for users that use OpenBLAS without gimp)
> >>  * Add a delay in GIMP to not load then close libraries too fast (so
> >> OpenBLAS threads are fully initialized when dl_close is called on it)
> >>
> >
> > Hi,
> >
> > I've posted a issue on openblas upstream project [0] and they suggested
> > some solutions.
> > One of them is to disable the use of compiler supported TLS and instead
> > use pthreads.
> >
> > I tested this and it seems to fix deadlocks while starting gimp (I tried
> > without arguments, with a non existing file and with an existing file).
> >
> > I've pushed a merge request with the patch at [1].
> > I've also asked openblas upstream if this patch could be a good solution.
> >
> > In that case would it be possible to have this patch tested for ones who
> > have major instabilities with gimp + openblas ?
> >
> > Thanks :)
> >
>
> Hi,
>
> I've updated the merge request [0] with the upstream proposed patch [1].
>
> @openblas maintainers, maybe someone can build a package with this patch
> and upload to experimental so others can check if gimp works fine with it ?
>
> I've myself tested it and gimp does not deadlock.
>
> I can provide a binary package that include this patch, but I'm not sure
> this is the best thing to do (I'm not the official maintainer, nor know
> a good place to upload it).
>
> [0] https://salsa.debian.org/science-team/openblas/merge_requests/1
> [1] https://github.com/xianyi/OpenBLAS/pull/1726
>
> --
> Alexis Murzeau
> PGP: B7E6 0EBB 9293 7B06 BDBC  2787 E7BD 1904 F480 937F
>
>
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