[PATCH v2] nptl: Check if thread is already terminated in sigcancel_handler (BZ 32782)

[Florian Weimer]

* Adhemerval Zanella:

> The SIGCANCEL signal handler should not issue __syscall_do_cancel,
> which calls __do_cancel and __pthread_unwind, if the cancellation
> is already in proces (and libgcc unwind is not reentrant).  Any
> cancellation signal received after is ignored.
>
> Checked on x86_64-linux-gnu and aarch64-linux-gnu.
> ---
>  nptl/pthread_cancel.c          | 14 ++++---
>  sysdeps/pthread/Makefile       |  1 +
>  sysdeps/pthread/tst-cancel32.c | 73 ++++++++++++++++++++++++++++++++++
>  3 files changed, 82 insertions(+), 6 deletions(-)
>  create mode 100644 sysdeps/pthread/tst-cancel32.c

Aurelien identified a typo.  Please fix that, and you can include:

Reviewed-by: Florian Weimer <fweimer@redhat.com>

Thanks,
Florian