bug#12832: 24.3.50; Emacs lockup when idle

[Andy Moreton]

On 08/11/2012 16:28, Eli Zaretskii wrote:
> > Date: Thu, 08 Nov 2012 12:57:18 +0000
> > From: Andy Moreton <andrewjmoreton@gmail.com>
> >
> > Windows Emacs (built from r110828) was idle for a few minutes while I made a
> > coffee. On returning, emacs was completely unresponsive and redisplay
> > was not drawing anything.
>
> If this recurs, maybe try bisecting to find the problematic commit.
> Do you know what was the previous revision which you used?

I rebuild emacs every day from trunk, but only do a full bootstrap when 
necessary. I have updated the Mingw compiler this week though, so that could 
be an issue. I'll try bisecting (and downgrading the compiler) if I see this 
again.

> Also, how was Emacs unresponsive -- did it consume any CPU cycles at
> all?  Were all the threads locked up, or just some?  If you detach
> from it, then attach again, do you see exactly the same backtrace?

Emacs was not consuming any cycles - the system was completely idle.

> > Thread 1 (Thread 8744.0xf50):
> > #0  0x7c90e514 in ntdll!LdrAccessResource () from C:\WINDOWS\system32\ntdll.dll
> > No symbol table info available.
> > #1  0x7c90d2aa in ntdll!ZwDuplicateObject () from C:\WINDOWS\system32\ntdll.dll
> > No symbol table info available.
> > #2  0x7c80df03 in KERNEL32!DuplicateHandle () from
> > C:\WINDOWS\system32\kernel32.dll
> > No symbol table info available.
> > #3  0xffffffff in ?? ()
> > No symbol table info available.
> > #4  0xfffffffe in ?? ()
> > No symbol table info available.
> > #5  0xffffffff in ?? ()
> > No symbol table info available.
> > #6  0x0162acb8 in real_itimer ()
> > No symbol table info available.
> > #7  0x00000000 in ?? ()
> > No symbol table info available.
>
> This is the main thread, but its backtrace looks like the stack is
> smashed, and real_itimer is a variable, not a function.
>
> We need more data points on this.

I'll see if this is reproduceable and try to get more info.

    AndyM