bug#24201: 25.1.50; TLS connections sometimes hang

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> I'm not sure -- I haven't been able to debug that at all.  Since C-g
>> doesn't work (and it happens so rarely and I have to catch it before the
>> peer hangs up), it makes it awkward...
>
> You could try using debug-on-event in conjunction with SIGUSR1/SIGUSR2
> to enter the debugger when you need.

Oh, that seems very useful; yes.  I'll set that up and try that the next
time it happens.

>> > Is inhibit-quit in fact nil or not inside this loop?
>> 
>> Looking at the code, I can't see any signs of it being inhibited here,
>> but I'm waiting for the next time it happens so that I can inspect with
>> gdb...
>
> You could also add a call to 'message' in that loop to print the value
> of the flag.

`inhibit-quit' is not set normally when that function is called (I just
checked), but perhaps...  Oh, I just thought something -- this function
(when it hangs) is always called from a timer.  Does the timer machinery
set `inhibit-quit'?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no