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Message-ID: <a3244df2-43ec-4d26-8719-558e10b8867c@dronecode.org.uk>
Date: Wed, 16 Jul 2025 16:35:45 +0100
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Subject: Re: doxygen hangs when many call graphs are generated.
To: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
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On 16/07/2025 13:36, Takashi Yano via Cygwin wrote:
> On Wed, 16 Jul 2025 21:13:59 +0900
> Takashi Yano via Cygwin <cygwin AT cygwin DOT com> wrote:
> 
>> On Tue, 17 Jun 2025 21:46:47 +0900
>> Takashi Yano wrote:
>>> I encountered a problem of doxygen when many call graphs are generated.
>>>
>>> How to reproduce:
>>> 1) Make a empty directory.
>>> 2) Place two files (Doxyfile, x.c) attached in the directory.
>>> 3) Run doxygen in the directory.
>>>
>>> It seems that this is a bug of cygwin1.dll and the cause is
>>> a deadlock in newlib/libc/stdio/findfp.c:__fp_lock_all().
>>>
>>> The following patch solves the issue, however, I am not sure
>>> this is the right thing at all.
>>>
>>> diff --git a/newlib/libc/stdio/findfp.c b/newlib/libc/stdio/findfp.c
>>> index 2cc549537..3de6b33fd 100644
>>> --- a/newlib/libc/stdio/findfp.c
>>> +++ b/newlib/libc/stdio/findfp.c
>>> @@ -298,7 +298,9 @@ __fp_unlock (struct _reent * ptr __unused, FILE * fp)
>>>   void
>>>   __fp_lock_all (void)
>>>   {
>>> +#ifndef __CYGWIN__
>>>     __sfp_lock_acquire ();
>>> +#endif
>>>     (void) _fwalk_sglue (NULL, __fp_lock, &__sglue);
>>>   }
>>>   
>>> @@ -306,6 +308,8 @@ void
>>>   __fp_unlock_all (void)
>>>   {
>>>     (void) _fwalk_sglue (NULL, __fp_unlock, &__sglue);
>>> +#ifndef __CYGWIN__
>>>     __sfp_lock_release ();
>>> +#endif
>>>   }
>>>   #endif
>>>
>>> Any suggenstions?
>>
>> The same hang happened while building aom package with doxygen.
>> Above patch also solves the issue.
>>
>> Any idea?

I think this is possibly the same problem as mentioned [1]

[1] https://cygwin.com/pipermail/cygwin-apps/2025-May/044318.html

> The stack trace is as follows. 
[...]
Thanks very much for digging into this!

(There do seem to be some changes around sfp locking in the 3.3.6 to 
3.4.0 interval, which might explain why this shows up then...)


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