Bug #404: Enabling event without filter fails with error: Not enough memory for filter bytecode - LTTng-tools - LTTng bugs repository

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Bug #404

closed

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

Added by Jesus Garcia about 12 years ago. Updated about 12 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

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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

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Updated by Mathieu Desnoyers about 12 years ago

File .swp .swp added

Can you try the following patch ?

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Updated by Jesus Garcia about 12 years ago

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

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Updated by Mathieu Desnoyers about 12 years ago

File fix-lttng-tools-empty-filter.patch fix-lttng-tools-empty-filter.patch added

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

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