Re: Emacs-26 threads problem [win64]

[Fabrice Popineau <fabrice.popineau@gmail.com>]

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2017-10-10 18:48 GMT+02:00 Eli Zaretskii <eliz@gnu.org>:

> > Date: Tue, 10 Oct 2017 19:30:11 +0300
> > From: Eli Zaretskii <eliz@gnu.org>
> > Cc: emacs-devel@gnu.org
> >
> > > From: Fabrice Popineau <fabrice.popineau@gmail.com>
> > > Date: Tue, 10 Oct 2017 18:13:19 +0200
> > > Cc: Emacs developers <emacs-devel@gnu.org>
> > >
> > > (gdb) p stack_pos
> > > $3 = {__max_align_ll = 0, __max_align_ld = 3.
> 587554638101247699761989924457637e-4943}
> >
> > What is &stack_pos, the address of stack_pos?  Is it properly aligned?
>
> Also, this very snippet runs every time a non-main thread is run by
> Emacs, and yet all of the 18 tests before this one succeeded for you.
> What is different in this 19th test that it fails?
>

What does this test do exactly ? (Well I could read the code but ... doing
many other things in parallel)

Because if I print &stack_pos, I get :

(gdb) run -batch --no-site-file --no-site-lisp -L ";../../emacs/test" -l
ert -l src/thread-tests.el --eval "(ert-run-tests-batch-and-exit (quote
(not (tag :expensive-test))))"
Starting program: /d/Source/emacs/build-emacs-26/src/emacs -batch
--no-site-file --no-site-lisp -L ";../../emacs/test" -l ert -l
src/thread-tests.el --eval "(ert-run-tests-batch-and-exit (quote (not (tag
:expensive-test))))"
[New Thread 20864.0x60c]
[New Thread 20864.0x5bb4]
[New Thread 20864.0x3070]
[New Thread 20864.0x332c]
[New Thread 20864.0x512c]
Running 28 tests (2017-10-10 19:54:11+0100)
[New Thread 20864.0x42ec]
[Thread 20864.0x42ec exited with code 0]
[New Thread 20864.0x25e8]
stack_pos = 741feb0
stack_pos = 7c1feb0
   passed   1/28  thread-errors
[New Thread 20864.0x1118]
[Thread 20864.0x25e8 exited with code 0]
[Thread 20864.0x1118 exited with code 0]
stack_pos = 841feb0
   passed   2/28  thread-signal-early
   passed   3/28  thread-sticky-point
[New Thread 20864.0x562c]
stack_pos = 8c1feb0
   passed   4/28  threads-alive
   passed   5/28  threads-all-threads
[New Thread 20864.0x471c]
[Thread 20864.0x562c exited with code 0]
[Thread 20864.0x471c exited with code 0]
stack_pos = 941feb0
   passed   6/28  threads-basic
   passed   7/28  threads-condvar-mutex
   passed   8/28  threads-condvar-name
   passed   9/28  threads-condvar-name-2
   passed  10/28  threads-condvar-type
[New Thread 20864.0x2970]
[Thread 20864.0x2970 exited with code 0]
stack_pos = 9c1feb0
   passed  11/28  threads-condvar-wait
   passed  12/28  threads-condvarp
   passed  13/28  threads-condvarp-2
[New Thread 20864.0x16a0]
[Thread 20864.0x16a0 exited with code 0]
stack_pos = a41feb0
   passed  14/28  threads-io-switch
   passed  15/28  threads-is-one
[New Thread 20864.0x4e68]
[Thread 20864.0x4e68 exited with code 0]
stack_pos = ac1feb0
   passed  16/28  threads-join
   passed  17/28  threads-join-self
[New Thread 20864.0x63f4]
[Thread 20864.0x63f4 exited with code 0]
stack_pos = b41feb0
   passed  18/28  threads-let-binding
[New Thread 20864.0x4340]

Thread 15 received signal SIGSEGV, Segmentation fault.
[Switching to Thread 20864.0x4340]
run_thread (state=0x400ae5e78 <dumped_data+4670360>) at
../../emacs/src/thread.c:702
702       self->m_stack_bottom = (char *) &stack_pos;


The value of stack_pos keeps  increasing. Isn't there some limit that is
reached here ?

Fabrice

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