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Bug #404

closed
JG

Enabling event without filter fails with error: Not enough memory for filter bytecode

Bug #404: Enabling event without filter fails with error: Not enough memory for filter bytecode

Added by Jesus Garcia about 13 years ago. Updated about 13 years ago.

Status:
Resolved
Priority:
Critical
Assignee:
-
Target version:
2.0.x stable
Start date:
11/22/2012
Due date:
% Done:

100%

Estimated time:

Description

We get the following error from sessiond when enabling an event via lttng_enable_event_with_filter without a filter:
error: Not enough memory for filter bytecode

This fault was reproduced when attempting to activate a session with the following event:
com_ericsson_cba_trace_testapp_lowtraf:TenPerSecA,TRACE_DEBUG_MODULE(10)

When the following filter was added, the activation succeeded:
com_ericsson_cba_trace_testapp_lowtraf:TenPerSecA,TRACE_DEBUG_MODULE(10),TenPs == 1

The complete log with sessiond/consumerd running in verbose mode has been attached.

The priority has been set to critical since most of our test cases are failing due to this fault.

LTTng Build info:
CURRENT HEAD: foss/babeltrace 52105e8 (HEAD, origin/master, origin/HEAD) Adding a test which do a sequence of seek BEGIN, LAST, BEGIN, LAST
CURRENT HEAD: foss/lttng-tools b6bbed5 (HEAD, origin/master, origin/HEAD) Fix: add missing padding for UST filter
CURRENT HEAD: foss/lttng-ust a593059 (HEAD, origin/master, origin/HEAD) filter: Add missing padding
CURRENT HEAD: foss/userspace-rcu 852a17a (HEAD, origin/master, origin/HEAD) wfcqueue: Fix lock and unlock functions

Files

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Activation_fails_when_event_is_enabled_wo_filter.txt (71.1 KB) Activation_fails_when_event_is_enabled_wo_filter.txt Jesus Garcia, 11/23/2012 10:15 AM
.swp (1.63 KB) .swp Mathieu Desnoyers, 11/23/2012 12:55 PM
fix-lttng-tools-empty-filter.patch (1.86 KB) fix-lttng-tools-empty-filter.patch Mathieu Desnoyers, 11/23/2012 03:29 PM

MD Updated by Mathieu Desnoyers about 13 years ago Actions
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 #1

Can you try the following patch ?

JG Updated by Jesus Garcia about 13 years ago Actions
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 #2

Hi Mathieu,

I tried the patch, but it doesn't fix the issue. I'm getting the same error. Are you checking for empty string on the filter?

Regards,
Jesus

MD Updated by Mathieu Desnoyers about 13 years ago Actions
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 #3

Please try the attached patch, but make sure you follow the API as this patch documents it. A NULL filter string will fall-back to enabling an event without filter attached. However, an empty string is considered as an invalid filter.

Thanks,

Mathieu

MD Updated by Mathieu Desnoyers about 13 years ago Actions
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 #4

  • Status changed from New to Resolved
  • % Done changed from 0 to 100
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