Based on feedback from Ubuntu developers, we see that unscd-0.48 was
released only to fix this issue [1]. On that basis, I feel it is
suitable as a pure backport to avoid introduction of other issues.
--- [1]
$ bzr branch lp:ubuntu/precise/unscd && mv unscd unscd-precise
$ bzr branch lp:ubuntu/quantal/unscd && mv unscd unscd-quantal
$ diff -ur --exclude 'debian' unscd-precise/nscd.c unscd-quantal/nscd.c
--- unscd-precise/nscd.c 2012-07-09 22:37:10.781166000 +0800
+++ unscd-quantal/nscd.c 2012-07-09 22:41:19.204361000 +0800
@@ -139,8 +139,9 @@
* thanks to Sebastian Krahmer (krahmer AT suse.de)
* 0.46 fix a case when we forgot to remove a future entry on worker failure
* 0.47 fix nscd without -d to not bump debug level
+ * 0.48 fix for changes in __nss_disable_nscd API in glibc-2.15
*/
-#define PROGRAM_VERSION "0.47"
+#define PROGRAM_VERSION "0.48"
#define DEBUG_BUILD 1
@@ -2097,7 +2098,7 @@
};
static const char *const help[] = {
- "Do not daemonize; log to stderr",
+ "Do not daemonize; log to stderr (-dd: more verbosity)",
"File to read configuration from",
"Invalidate cache",
"Shut the server down",
@@ -2347,6 +2348,7 @@
/* not static - don't inline me, compiler! */
+void readlink_self_exe(void);
void readlink_self_exe(void)
{
char buf[PATH_MAX + 1];
@@ -2389,15 +2391,32 @@
reqdata.req.key_len = arg_len;
memcpy(reqdata.arg, arg, arg_len);
xfull_write(sock, &reqdata, arg_len + sizeof(ureq));
- printf("sent invalidate(%s) request, exiting\n", arg);
+ if (debug) {
+ printf("sent invalidate(%s) request, exiting\n", arg);
+ }
}
exit(0);
}
+/* Callback for glibc-2.15 */
+struct traced_file;
+static void do_nothing(size_t dbidx, struct traced_file *finfo)
+{
+ /* nscd from glibc-2.15 does something like this:
+ if (!dbs[dbidx].enabled || !dbs[dbidx].check_file)
+ return;
+ add_file_to_watch_list(finfo->fname);
+ */
+}
+
/* This internal glibc function is called to disable trying to contact nscd.
- * We _are_ nscd, so we need to do the lookups, and not recurse. */
-void __nss_disable_nscd(void);
+ * We _are_ nscd, so we need to do the lookups, and not recurse.
+ * Until 2.14, this function was taking no parameters.
+ * In 2.15, it takes a function pointer from hell.
+ */
+void __nss_disable_nscd(void (*hell)(size_t, struct traced_file*));
+
int main(int argc, char **argv)
{
@@ -2407,7 +2426,7 @@
const char *conffile;
/* make sure we don't get recursive calls */
- __nss_disable_nscd();
+ __nss_disable_nscd(do_nothing);
if (argv[0][0] == 'w') /* "worker_nscd" */
worker(argv[1]);
** Description changed:
Clean x86-64 install of precise as of 2012-03-17; unscd is hit with SEGV
whenever it starts, ie 100% reproducability.
ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unscd 0.47-2build2
ProcVersionSignature: Ubuntu 3.2.0-19.30-generic 3.2.11
Uname: Linux 3.2.0-19-generic x86_64
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
Date: Sun Mar 18 11:18:59 2012
Disassembly: => 0x1: Cannot access memory at address 0x1
ExecutablePath: /usr/sbin/nscd
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64
(20120316)
ProcCmdline: /usr/sbin/nscd
ProcEnviron:
- LANGUAGE=en_SG:en
- TERM=linux
- LANG=en_SG.UTF-8
- SHELL=/bin/bash
+ LANGUAGE=en_SG:en
+ TERM=linux
+ LANG=en_SG.UTF-8
+ SHELL=/bin/bash
SegvAnalysis:
- Segfault happened at: 0x1: Cannot access memory at address 0x1
- PC (0x00000001) not located in a known VMA region (needed executable region)!
+ Segfault happened at: 0x1: Cannot access memory at address 0x1
+ PC (0x00000001) not located in a known VMA region (needed executable region)!
SegvReason: executing NULL VMA
Signal: 11
SourcePackage: unscd
StacktraceTop:
- ?? ()
- _nss_files_init (cb=0x1) at nss_files/files-init.c:47
- nss_load_library (ni=<optimized out>) at nsswitch.c:412
- nss_load_all_libraries (def=0x7f03dd560b74 "dns [!UNAVAIL=return] files",
service=0x7f03dd560b90 "hosts") at nsswitch.c:875
- __nss_disable_nscd (cb=<optimized out>) at nsswitch.c:895
+ ?? ()
+ _nss_files_init (cb=0x1) at nss_files/files-init.c:47
+ nss_load_library (ni=<optimized out>) at nsswitch.c:412
+ nss_load_all_libraries (def=0x7f03dd560b74 "dns [!UNAVAIL=return] files",
service=0x7f03dd560b90 "hosts") at nsswitch.c:875
+ __nss_disable_nscd (cb=<optimized out>) at nsswitch.c:895
Title: nscd crashed with SIGSEGV in _nss_files_init()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
+
+ unscd 0.48 fixes just this issue (see patch delta below) and is already
released in Quantal, so is a candidate fix for this issue in Precise:
+ http://archive.ubuntu.com/ubuntu/pool/universe/u/unscd/
+
+ http://archive.ubuntu.com/ubuntu/pool/universe/u/unscd/unscd_0.48-2_amd64.deb
+ http://archive.ubuntu.com/ubuntu/pool/universe/u/unscd/unscd_0.48-2_i386.deb
+
+ I have verified this here and it addresses the issue. SRU justification:
+ [Impact] unscd-0.47 crashes each time it is started, thus is useless and
obtrusive
+ [Test Case] start unscd-0.47: sudo /etc/init.d/unscd start
+ [Regression Potential] None due to existing crasher
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/958305
Title:
nscd crashed with SIGSEGV in _nss_files_init()
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/958305/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
