http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=415
Summary: daemon polling turns into endless loop
Product: Xen
Version: 2.0
Platform: x86
OS/Version: Linux
Status: NEW
Severity: critical
Priority: P2
Component: Hypervisor
AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
ReportedBy: john.wells@xxxxxxxxxx
We're having a similar problem to that documented, but not resolved, here:
http://lists.xensource.com/archives/html/xen-users/2005-08/msg00110.html
The python process that runs "/usr/sbin/xend start" has reached 99.9% CPU
utilization.
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3569 root 25 0 12952 7876 2456 R 99.9 6.2 13444:26 python
/usr/sbin/xend start
xm commands don't respond, because the daemon process has apparently
entered an endless loop.
If you strace a normally running xend process, you'll see:
gettimeofday({1132084397, 346225}, NULL) = 0xen.xend.server import SrvDaemon
gettimeofday({1132084397, 346536}, NULL) = 0= SrvDaemon.instance()
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN},
{fd=10, events=POLLIN}, {fd=15, events=POLLIN}, {fd=18, events=POLLIN}],
6, 178) = 0
gettimeofday({1132084397, 534960}, NULL) = 0
gettimeofday({1132084397, 535283}, NULL) = 0
That poll line is key...the daemon is apparently polling for commands issued
from the user.
When the bug occurs, this polling stops. The daemon is thrown into an endless
loop where gettimeofday is called rapidly in succession. Stracing to the process
yields:
gettimeofday({1132076987, 801316}, NULL) = 0
gettimeofday({1132076987, 801401}, NULL) = 0
gettimeofday({1132076987, 801486}, NULL) = 0
gettimeofday({1132076987, 801571}, NULL) = 0
gettimeofday({1132076987, 801657}, NULL) = 0
gettimeofday({1132076987, 801742}, NULL) = 0
gettimeofday({1132076987, 801828}, NULL) = 0
gettimeofday({1132076987, 801913}, NULL) = 0
gettimeofday({1132076987, 801999}, NULL) = 0
gettimeofday({1132076987, 802084}, NULL) = 0
...over, and over, and over again.
This is on a CentOS4 (RHEL4) box, on an i686.
Kernel: 2.6.11.12-xen0
Xen version: 2.0.7
The only resolution we've found is rebooting the host box.
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