bug#6739: 24.0.50; hang in *VC-log* -- redisplaying?

bug#6739: 24.0.50; hang in *VC-log* -- redisplaying?

[rogers-emacs]

   In emacs built from git on 17-July (on openSUSE GNU/Linux 11.0), I am
experiencing frequent hanging in *VC-log* buffers.  In a fresh *VC-log*
buffer, as soon as I type "SPC RET", the cursor disappears and I get no
response.  Typing C-g restores control, though sometimes I have to C-g
twice or more.  It appears to be a display problem, as the display
updates to reflect keystrokes typed before the C-g -- and sometimes the
first C-g will update the display partway, and the next will update it
more.

   Burying or killing the *VC-log* buffer makes the problem go away.
Same with deleting the initial SPC character, which appears to be
necessary.

   I have had no luck tracking this down any further.  Setting
debug-on-quit not only does not enter the debugger, it sometimes seems
to cause emacs to hang indefinitely.  I assume the next step would be to
start emacs under gdb, but I am not familiar enough with redisplay (or
gdb for that matter) to know what to look for.  Any help would be
appreciated.

					-- Bob Rogers
					   http://www.rgrjr.com/

bug#6739: 24.0.50; hang in *VC-log* -- redisplaying?

[Dan Nicolaescu]

rogers-emacs@rgrjr.dyndns.org writes:

>    In emacs built from git on 17-July (on openSUSE GNU/Linux 11.0), I am
> experiencing frequent hanging in *VC-log* buffers.  In a fresh *VC-log*
> buffer, as soon as I type "SPC RET", the cursor disappears and I get no
> response.  Typing C-g restores control, though sometimes I have to C-g
> twice or more.  It appears to be a display problem, as the display
> updates to reflect keystrokes typed before the C-g -- and sometimes the
> first C-g will update the display partway, and the next will update it
> more.
>
>    Burying or killing the *VC-log* buffer makes the problem go away.
> Same with deleting the initial SPC character, which appears to be
> necessary.

Can you please look in the *Messages* buffer when the problem happens,
see if there's anything strange there.

>
>    I have had no luck tracking this down any further.  Setting
> debug-on-quit not only does not enter the debugger, it sometimes seems
> to cause emacs to hang indefinitely.  I assume the next step would be to
> start emacs under gdb, but I am not familiar enough with redisplay (or
> gdb for that matter) to know what to look for.  Any help would be
> appreciated.
>
> 					-- Bob Rogers
> 					   http://www.rgrjr.com/

bug#6739: 24.0.50; hang in *VC-log* -- redisplaying?

[Glenn Morris]

rogers-emacs@rgrjr.dyndns.org wrote:

>    In emacs built from git on 17-July (on openSUSE GNU/Linux 11.0), I am
> experiencing frequent hanging in *VC-log* buffers.  In a fresh *VC-log*
> buffer, as soon as I type "SPC RET", the cursor disappears and I get no
> response.  Typing C-g restores control, though sometimes I have to C-g
> twice or more.  It appears to be a display problem, as the display
> updates to reflect keystrokes typed before the C-g -- and sometimes the
> first C-g will update the display partway, and the next will update it
> more.

Perhaps this was a duplicate of bug#6343. That was supposedly fixed on
July 12, but I have no idea if whatever git repository you were using
was up-to-date.

If you still see the issue, please reply and we can reopen this if
needed.