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Bug 607949

Summary: No core file was generated when RHEL 6 PV guest crashed
Product: Red Hat Enterprise Linux 5 Reporter: Yufang Zhang <yuzhang>
Component: xenAssignee: Xen Maintainance List <xen-maint>
Status: CLOSED DUPLICATE QA Contact: Virtualization Bugs <virt-bugs>
Severity: high Docs Contact:
Priority: high    
Version: 5.6CC: drjones, leiwang, llim, xen-maint, xinsun
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-06-28 17:21:34 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
screen dump of the guest when it crashes none

Description Yufang Zhang 2010-06-25 09:30:16 UTC 
Description of problem:
For RHEL6 PV guest, no core file was generated automatically when the guest crashed, even core-dumps had been enabled in xend-config.sxp.

Version-Release number of selected component (if applicable):
kernel-xen-devel-2.6.18-194.3.1.el5
xen-libs-3.0.3-113.el5
xen-debuginfo-3.0.3-113.el5
xen-devel-3.0.3-113.el5
kernel-xen-2.6.18-194.3.1.el5
xen-3.0.3-113.el5


How reproducible:
Always.

Steps to Reproduce:
1. enable core-dumps and restart xend
2. create a RHEL 6 PV guest
3. force the guest to crash within the guest via:
echo c > /proc/sysrq-trigger
  
Actual results:
The guest does crash but no core file is generated.


Expected results:
core file should be generated automatically when the guest crashes.


Additional info:
screen dump of the guest is in the attachment.
Comment 1 Yufang Zhang 2010-06-25 09:35:01 UTC 
Created attachment 426812 [details]
screen dump of the guest when it crashes
Comment 2 Lei Wang 2010-06-25 10:04:36 UTC 
Same problem occur for RHEL6 HVM guest.

With same version xen package,
and kernel-xen version is:  2.6.18-194.6.1.el5
Comment 3 Andrew Jones 2010-06-28 17:21:34 UTC 
To test if the host's userspace can create core files correctly, then the dump should be initiated with 'xm dump-core' or 'virsh dump'. This appears to work correctly (although crash has a problem reading PV guest dumps: bug 608779).

When initiating a crash with 'echo c > /proc/sysrq-trigger' this is testing the "kexec" path in the guest kernel. This is known not to work, see bug 523132.

I'll dup this bug against the kexec bug. If this was really a test of the host userspace, then it should be closed as NOTABUG due to using the wrong mechanism.

*** This bug has been marked as a duplicate of bug 523132 ***