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systemtap fails to find trace events, even though all of them are available in directory:/sys/kernel/debug/tracing/events. Running "perf record sched" finds all the sched trace events without any issue.

System is running: Linux (none) 3.2.0-48-virtual #74-Ubuntu SMP Thu Jun 6 20:02:55 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

stap -l 'kernel.trace("*")

No event found

systemtap finds kernel functions without any issue.

stap -l 'kernel.function("*")'

.. kernel.function("AUDIT_MODE@/build/buildd/linux-3.2.0/security/apparmor/include/policy.h:311") kernel.function("BLEND_OP@/build/buildd/linux-3.2.0/crypto/sha256_generic.c:48") kernel.function("BLOCK_NEXT@/build/buildd/linux-3.2.0/drivers/staging/zram/xvmalloc.c:82") ....

I saw a bug reported on openSUSE:

Bug 800335 - devel:tools/systemtap: Undeclared dependency on libebl1

But libebl1 is part of Elfutils package that is already installed. What could be missing that resulting systemtap not to find trace events.

Thanks, Amer.

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user2464401
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  • Try: `stap --poison-cache -vvv -L 'kernel.trace("*")'` – fche Sep 04 '13 at 20:45
  • Thanks for the pointer, but it did not help. I ran: # stap --poison-cache -vvv -L 'kernel.trace("*")'. It ran bunch of make but it is still not finding trace points. – user2464401 Sep 04 '13 at 21:15
  • Please report the problem on the mailing list, including that stap -vvv ... output. – fche Sep 06 '13 at 16:42

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