Howdy,
I received the following error today when I attempted to run a DTrace
script that uses the Java hotspot provider:
$ dtrace -s dbmethodprofile.d
dtrace: failed to compile script methods.d: line 15: probe description
:::method-entry does not match any probes
The Java process that I was attempting to trace was started with the
"-XX:+DTraceMethodProbes" option, so the method-* probes should be
available. When I did a bit of digging, I noticed that the hotspot
probes were still enabled after the process exited:
$ ps -ef | grep java
root 6988 6803 0 01:43:53 pts/1 0:00 grep java
$ dtrace -l | grep hotspot |more
3515 hotspot10316 libjvm.so
__1cTClassLoadingServiceTnotify_class_loaded6FpnNinstanceKlass_b_v_
clas
s-loaded
3516 hotspot10316 libjvm.so
__1cTClassLoadingServiceVnotify_class_unloaded6FpnNinstanceKlass__v_
cla
ss-unloaded
3517 hotspot10316 libjvm.so
__1cHnmethodbFpost_compiled_method_load_event6M_v_
compiled-method-load
3518 hotspot10316 libjvm.so
__1cHnmethodbBpost_compiled_method_unload6M_v_ compiled-method-unload
3519 hotspot10316 libjvm.so
__1cHnmethodbAmake_not_entrant_or_zombie6Mi_v_ compiled-method-unload
3520 hotspot10316 libjvm.so
__1cVVM_ParallelGCSystemGCEdoit6M_v_ gc-begin
3521 hotspot10316 libjvm.so
__1cbMVM_ParallelGCFailedPermanentAllocationEdoit6M_v_ gc-begin
3522 hotspot10316 libjvm.so
__1cbDVM_ParallelGCFailedAllocationEdoit6M_v_ gc-begin
3523 hotspot10316 libjvm.so __1cRVM_GenCollectFullEdoit6M_v_ gc-begin
3524 hotspot10316 libjvm.so
__1cbAVM_GenCollectForAllocationEdoit6M_v_ gc-begin
< ..... >
I checked on another box, and the hotspot probes disappeared after the
Java process exited. Has anyone encountered this bizarre scenario
before? I checked the OpenSolaris and Java bug database, but wasn't
able to find an issue that matched the symptoms listed above. The
software in question is Java 6 update 3 and X64 Solaris 10 update 3.
If this is a known issue, could someone reply with the bugid? If this
is an unknown issue, I will open a ticket with Sun support (I made
sure to snag a core file prior to rebooting the server to remove the
ghost probes).
Thanks for any insight,
- Ryan
--
UNIX Administrator
http://prefetch.net
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