Package: uim-el
Version: 1:1.5.7-2
Severity: normal
When I update or remove an emacs-related package (mainly emacs itself,
but I think I've seen it reproduce with some other package which I
don't recall) on a system where uim-el is installed, the processes
uim-el-agent and uim-el-helper-agent use up the CPU, with a total
utilization of 100%. Two copies of each program is run.
Steps to reproduce:
* Install uim-el and emacs23. The problem might already reproduce here
although I haven't tried.
* In aptitude, re-install emacs23 with the `L' key.
Note: I've tried doing
dpkg -ri /var/cache/apt/archives/emacs23_23.1+1-5_amd64.deb
but for some reason the problem doesn't reproduce reliably. If I do a
reinstall from aptitude, the reproducibility has been 100% so far.
The cause appears to be that during either remove or install, emacs
closes the stdin of uim-el-agent and uim-el-helper-agent without
sending a QUIT command. These programs don't check for EOF, so they
go into a tight loop that tries to read more input, which immediately
fails, then retries the read right away. The attached patch will make
these programs exit when EOF or I/O error is detected.
-- System Information:
Debian Release: squeeze/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.30-2-amd64 (SMP w/2 CPU cores)
Locale: LANG=ja_JP.EUC-JP, LC_CTYPE=ja_JP.EUC-JP (charmap=EUC-JP) (ignored:
LC_ALL set to ja_JP.eucJP)
Shell: /bin/sh linked to /bin/bash
Versions of packages uim-el depends on:
ii emacs [emacsen] 23.1+1-5 The GNU Emacs editor (metapackage)
ii emacs23 [emacsen] 23.1+1-5 The GNU Emacs editor (with GTK+ us
ii libc6 2.10.1-5 GNU C Library: Shared libraries
ii libgcroots0 0.8.3-4 GC shared library for a Scheme int
ii libuim6 1:1.5.7-2 Simple and flexible input method c
ii uim-common 1:1.5.7-2 Common files for uim
ii uim-utils 1:1.5.7-2 Utilities for uim
uim-el recommends no packages.
uim-el suggests no packages.
-- no debconf information
===File /dvl/debian/uim-el/uim-1.5.7/debian/patches/13_eof_spin.dpatch===
#! /bin/sh /usr/share/dpatch/dpatch-run
## 13_eof_spin.dpatch by <j...@debian.localdomain.org>
##
## All lines beginning with `## DP:' are a description of the patch.
## DP: No description.
@DPATCH@
diff -urNad uim-1.5.7~/emacs/uim-el-agent.c uim-1.5.7/emacs/uim-el-agent.c
--- uim-1.5.7~/emacs/uim-el-agent.c 2009-01-20 20:16:35.000000000 -0600
+++ uim-1.5.7/emacs/uim-el-agent.c 2010-01-24 21:21:47.000000000 -0600
@@ -34,7 +34,7 @@
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-
+#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
@@ -631,6 +631,7 @@
main(int argc, char *argv[])
{
int opt;
+ char buf[1024];
while ((opt = getopt(argc, argv, "d")) != -1) {
switch (opt) {
@@ -660,7 +661,14 @@
fflush(stdout);
- fgets(buf, sizeof(buf), stdin);
+ if (fgets (buf, sizeof (buf), stdin) == NULL) {
+ if (feof (stdin))
+ debug_printf (DEBUG_NOTE, "unexpected EOF\n");
+ else
+ debug_printf (DEBUG_ERROR, "failed to read command: %s\n",
+ strerror (errno));
+ goto QUIT;
+ }
p1 = buf;
serial = -1;
diff -urNad uim-1.5.7~/emacs/uim-el-helper-agent.c
uim-1.5.7/emacs/uim-el-helper-agent.c
--- uim-1.5.7~/emacs/uim-el-helper-agent.c 2009-01-20 20:16:35.000000000
-0600
+++ uim-1.5.7/emacs/uim-el-helper-agent.c 2010-01-24 21:21:34.000000000
-0600
@@ -35,6 +35,7 @@
*/
+#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
@@ -197,7 +198,10 @@
}
-static void
+/**
+ * @return 1 if success, 0 if error.
+ */
+static int
read_command()
{
ssize_t len;
@@ -206,8 +210,15 @@
debug_printf(DEBUG_NOTE, "read command\n");
do {
- if ((len = read(STDIN_FILENO, rbuf, sizeof(rbuf) - 1)) == -1)
- debug_printf(DEBUG_NOTE, "stdin has corrupted\n");
+ len = read(STDIN_FILENO, rbuf, sizeof(rbuf) - 1);
+ if (len == -1) {
+ debug_printf(DEBUG_NOTE, "stdin is corrupt: %s\n", strerror (errno));
+ return 0;
+ }
+ if (len == 0) {
+ debug_printf(DEBUG_NOTE, "unexpected EOF\n");
+ return 0;
+ }
rbuf[len] = '\0';
@@ -221,6 +232,7 @@
} while (!command_exists_in_cmdbuf());
+ return 1;
}
@@ -290,7 +302,8 @@
debug_printf(DEBUG_NOTE, "data arrive\n");
if (FD_ISSET(STDIN_FILENO, &rfds)) {
- read_command();
+ if (! read_command())
+ goto QUIT;
}
if (FD_ISSET(helper_fd, &rfds)) {
@@ -307,6 +320,7 @@
fflush(NULL);
}
+ QUIT:
uim_quit();
return 0;
}
diff -urNad uim-1.5.7~/emacs/uim-el-helper-agent.h
uim-1.5.7/emacs/uim-el-helper-agent.h
--- uim-1.5.7~/emacs/uim-el-helper-agent.h 2009-01-20 20:16:35.000000000
-0600
+++ uim-1.5.7/emacs/uim-el-helper-agent.h 2010-01-24 21:21:34.000000000
-0600
@@ -47,7 +47,6 @@
static int command_exists_in_cmdbuf();
static int process_command();
static void process_message(char *msg);
-static void read_command();
static void wait_data_arrival(fd_set *rfds);
void cleanup(void);
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