Re: handle_threadlist_exception: handle_threadlist_exception called with threadlist_ix -1

[Pavel Tsekov <ptsekov at gmx dot net>]

On Wed, 12 Oct 2005, Pavel Tsekov wrote:

> On Tue, 11 Oct 2005, Christopher Faylor wrote:
>
> > I don't see how ignoring blocked signals would cause a SEGV however.
>
> Well... indirectly they do :) I hope you are not too annoyed already
> because this time I really found the cause of the problem.
>
> Assume a signal is sent to a thread with pthread_kill() but the thread is
> blocking the signal and in doesn't get processed through it's lifetime.
> The thread dies but the signal still remains in the singal queue.
> Something triggeres the processing of the signal - sig_dispatch_pending()
> in my case (which is called as part of pthread_sigmask()). As part of the
> processing the 'tls' member of sigpacket is dereferenced but at that time
> it is already invalid.
>
> I'll try to post a testcase ASAP which demonstrates the problem.

Find the testcase attached. The interesting part starts when SIGUSR2 is
send from the main thread.

Attachment: sigpacket_bad_tls_crash.c
Description: Text document

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