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Created attachment 523193[details]
Disassembly of the crashing function
Crash site is:
=> 0x0139073f <+847>: add %al,(%eax)
(gdb) p $pc
$1 = (void (*)()) 0x139073f <initpyexpat+847>
(gdb) p $eax
$2 = 20518912
(gdb) p $al
$3 = 0
Minimal reproducer on this machine:
# python -c"import pyexpat"
which upon running under gdb:
# gdb --args python -c"import pyexpat"
(gdb) run
Starting program: /usr/bin/python -cimport\ pyexpat
[Thread debugging using libthread_db enabled]
Program received signal SIGSEGV, Segmentation fault.
0x004a773f in initpyexpat () at /usr/src/debug/Python-2.6.6/Modules/pyexpat.c:1919
1919 ErrorObject = PyErr_NewException("xml.parsers.expat.ExpatError",
Missing separate debuginfos, use: debuginfo-install expat-2.0.1-9.1.el6.i686 glibc-2.12-1.25.el6_1.3.i686
(gdb) bt
demonstrates that it's the same crash site.
Something is going badly wrong inside /usr/lib/python2.6/lib-dynload/pyexpat.so
Comment 14Frantisek Reznicek
2011-09-21 12:29:48 UTC
The machine had very high uptime with indeed old kernel and kvm module.
After update & restart no more issues seen.
Treated as understood linked to bug 615225.
-> CLOSED / DUPLICATE
*** This bug has been marked as a duplicate of bug 615225 ***
Description of problem: An update process done by yum clean all ; yum update commands ocassionaly crashed with segmentation fault on an RHEL 6.1 i686 VM (hosted by RHEL5.7 x86_64) See terminal transcript below in last section. The crash was pointing out pyexpat module: Core was generated by `/usr/bin/python /usr/bin/yum update'. Program terminated with signal 11, Segmentation fault. #0 0x00b3373f in initpyexpat () at /usr/src/debug/Python-2.6.6/Modules/pyexpat.c:1919 1919 ErrorObject = PyErr_NewException("xml.parsers.expat.ExpatError", Missing separate debuginfos, use: ... (gdb) #0 0x00b3373f in initpyexpat () at /usr/src/debug/Python-2.6.6/Modules/pyexpat.c:1919 #1 0x00cc7a16 in _PyImport_LoadDynamicModule (name=0xbf8f434b "pyexpat", pathname=0xbf8f329b "/usr/lib/python2.6/lib-dynload/pyexpat.so", fp=0xa091f58) at Python/importdl.c:53 #2 0x00cc4e20 in load_module (name=0xbf8f434b "pyexpat", fp=<value optimized out>, buf=0xbf8f329b "/usr/lib/python2.6/lib-dynload/pyexpat.so", type=3, loader=0x0) at Python/import.c:1830 #3 0x00cc593f in import_submodule (mod=None, subname=0xbf8f434b "pyexpat", fullname=0xbf8f434b "pyexpat") at Python/import.c:2592 #4 0x00cc5c3c in load_next (mod=None, altmod=None, p_name=0xbf8f433c, buf=0xbf8f434b "pyexpat", p_buflen=0xbf8f4344) at Python/import.c:2412 Version-Release number of selected component (if applicable): [root@dhcp-lab-231 ~]# rpm -q yum python yum-3.2.29-17.el6.noarch python-2.6.6-20.el6.i686 How reproducible: 40% Steps to Reproduce: 1. yum clean all ; yum update 2. reboot 3. yum clean all ; yum update Actual results: yum upgrade ends with segmentation fault in a python module Expected results: yum upgrade performs operation and exits cleanly Additional info: [root@dhcp-lab-231 ~]# yum clean all ; yum update Cleaning repos: rhel61-brq rhel61-brq-debuginfo rhel61-brq-optional : rhel61-brq-supplementary rhel61-brq-supplementary-debug : rhel61-brq-updates Cleaning up Everything rhel61-brq | 4.0 kB 00:00 rhel61-brq/primary_db | 2.4 MB 00:00 rhel61-brq-debuginfo | 3.0 kB 00:00 rhel61-brq-debuginfo/primary_db | 342 kB 00:00 rhel61-brq-optional | 3.8 kB 00:00 rhel61-brq-optional/primary_db | 1.0 MB 00:00 rhel61-brq-supplementary | 4.0 kB 00:00 rhel61-brq-supplementary/primary_db | 30 kB 00:00 rhel61-brq-supplementary-debug | 3.0 kB 00:00 rhel61-brq-supplementary-debug/primary_db | 1.2 kB 00:00 rhel61-brq-updates | 2.2 kB 00:00 rhel61-brq-updates/primary_db | 3.7 MB 00:00 Setting up Update Process No Packages marked for Update [root@dhcp-lab-231 ~]# reboot Broadcast message from root.brq.redhat.com (/dev/pts/0) at 15:39 ... The system is going down for reboot NOW! [root@dhcp-lab-231 ~]# Connection to dhcp-lab-231.englab.brq.redhat.com closed by remote host. Connection to dhcp-lab-231.englab.brq.redhat.com closed. [freznice@dhcp-26-251 ~]$ ssh root.brq.redhat.com Last login: Mon Sep 12 14:46:39 2011 from dhcp-26-251.brq.redhat.com [root@dhcp-lab-231 ~]# yum clean all ; yum update Cleaning repos: rhel61-brq rhel61-brq-debuginfo rhel61-brq-optional : rhel61-brq-supplementary rhel61-brq-supplementary-debug : rhel61-brq-updates Cleaning up Everything Segmentation fault [root@dhcp-lab-231 ~]# rpm -q yum yum-3.2.29-17.el6.noarch [root@dhcp-lab-231 ~]# ulimit -c unlimited [root@dhcp-lab-231 ~]# yum clean all ; yum update Cleaning repos: rhel61-brq rhel61-brq-debuginfo rhel61-brq-optional : rhel61-brq-supplementary rhel61-brq-supplementary-debug : rhel61-brq-updates Cleaning up Everything Segmentation fault (core dumped) [root@dhcp-lab-231 ~]# ls anaconda-ks.cfg dump.log install.log mrg_cluster_tests core.1360 dwn install.log.syslog rpmbuild [root@dhcp-lab-231 ~]# rpm -q yum python yum-3.2.29-17.el6.noarch python-2.6.6-20.el6.i686 [root@dhcp-lab-231 ~]# uname -a Linux dhcp-lab-231.englab.brq.redhat.com 2.6.32-131.12.1.el6.i686 #1 SMP Sun Jul 31 16:44:30 EDT 2011 i686 i686 i386 GNU/Linux [root@dhcp-lab-231 ~]# file core.1360 core.1360: ELF 32-bit LSB core file Intel 80386, version 1 (SYSV), SVR4-style, from '/usr/bin/python /usr/bin/yum update'