Re: __pthread_setcancelstate called unconditionally, crashes at 0

[Florian Weimer]

* Samuel Thibault:

> Florian Weimer, le jeu. 11 mai 2023 19:44:42 +0200, a ecrit:
>> * Sergey Bugaev:
>> > Clearly __pthread_setcancelstate has been pragma weak'd, and used here
>> > without a check. This is a statically linked x86_64-gnu (so, Hurd and
>> > HTL) executable. Commit 93d78ec1cba68184931b75bef29afd3aed30f43a
>> > "nptl: Move pthread_setcancelstate into libc" seems to be the culprit:
>> > that commit only moved the NPTL symbol into libc, yet changed the
>> > original __libc_ptf_call (__pthread_setcancelstate) calls to direct
>> > __pthread_setcancelstate calls, in this and many other places.
>> 
>> Apparently, Hurd does not support async cancellation?
>
> ? It does, see htl/pt-cancel.c's check for
> PTHREAD_CANCEL_ASYNCHRONOUS.

But __pthread_setcancelstate does not trigger async cancellation if
there's a pending async request and cancellation is enabled.

Thanks,
Florian