Vim pegs the CPU when typing ( open paren

[Baron Schwartz]

Binary package hint: vim

Vim pegs the CPU at 100% for about 30 to 60 seconds when I type an open parentheses '(' in a certain location in the file.

baron@kanga:~$ dpkg -l | grep vim
ii vim-common 1:7.1-138+1ubuntu3 Vi IMproved - Common files
ii vim-full 1:7.1-138+1ubuntu3 Vi IMproved - enhanced vi editor (transition
ii vim-gnome 1:7.1-138+1ubuntu3 Vi IMproved - enhanced vi editor - with GNOM
ii vim-gui-common 1:7.1-138+1ubuntu3 Vi IMproved - Common GUI files
ii vim-runtime 1:7.1-138+1ubuntu3 Vi IMproved - Runtime files
ii vim-tiny 1:7.1-138+1ubuntu3 Vi IMproved - enhanced vi editor - compact v

I'm on 8.04.

To repro (another user repro'ed, by the way), place the cursor after this text in the attached file:

CREATE TABLE checksum (
 db char(64) NOT NULL,
 tbl char(64) NOT NULL,
 chunk int NOT NULL,
 boundaries char(64) NOT NULL,
 this_crc char(40) NOT NULL,
 this_cnt int NOT NULL,
 master_crc char(40) NULL,
 master_cnt int NULL,
 ts timestamp NOT NULL,
 PRIMARY KEY (db, tbl, chunk)
);

Now type

create table argtest (

And watch it hang.

After it becomes responsive again, you can start a new line and type

 db char(64) NOT NULL,

And it'll do the same thing at the (.

[Dominique Pellé (dominique-pelle)]

I could not reproduce it somehow, but the bug description sounds an awful lot like the following bug which was fixed in vim-7.1.227 on Jan 13 2008:

Patch 7.1.227
Problem: Hang in syntax HL when moving over a ")". (Dominique Pelle)
Solution: Avoid storing a syntax state in the wrong position in the list of
            remembered states.
Files: src/syntax.c

[Dominique Pellé (dominique-pelle)]

The following patch could from Jan 6 2008 could also be relevant:

Patch 7.1.211
Problem: The matchparen plugin may take an unexpected amount of time, so
            that it looks like Vim hangs.
Solution: Add a timeout to searchpair(), searchpairpos(), search() and
            searchpos(). Use half a second timeout in the plugin.
Files: runtime/doc/eval.txt, runtime/plugin/matchparen.vim, src/edit.c,
            src/eval.c, src/ex_cmds2.c, src/ex_docmd.c, src/normal.c,
            src/proto/eval.pro, src/proto/ex_cmds2.pro, src/proto/search.pro,
            src/search.c

[Baron Schwartz (baron-xaprb)]

It doesn't reproduce in Ubuntu 8.10 so I believe it must be fixed as you said.

[Andrew McCarthy (andrewmccarthy)]

Thanks for taking the time to report this bug. Since it appears to be fixed in the latest release of Ubuntu, I am closing this bug.