Bug 814 – Function logging causing assert in wireless examples

Bug 814 - Function logging causing assert in wireless examples


Summary:	Function logging causing assert in wireless examples

Status:	RESOLVED FIXED

Product:	ns-3
Classification:	Unclassified
Component:	wifi
Version:	ns-3-dev
Hardware:	All All

Importance:	P5 normal
Assigned To:	ns-bugs

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2010-02-13 14:57 EST by Josh Pelkey
Modified:	2010-02-18 14:55 EST (History)
CC List:	1 user (show)

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Description Josh Pelkey 2010-02-13 14:57:21 EST

Try export 'NS_LOG=*=function|prefix_func|prefix_time'. Then try to run  examples/wireless/wifi-simple-adhoc.  I am getting an assert.  I tried this on a few other examples outside of the wireless directory, and it seemed to run fine.  I also tried other logging levels on the wireless examples (info, debug, warn) but these ran fine.

Comment 1 Josh Pelkey 2010-02-18 14:07:51 EST

I've tracked this down to a recent change in dca-txop.cc, http://code.nsnam.org/ns-3-dev/diff/dba5c9b69c3b/src/devices/wifi/dca-txop.cc

Specifically, the issue is with #define NS_LOG_APPEND_CONTEXT std::clog << "[mac=" << m_low->GetAddress () << "] ";  That m_low looks to be null at some point and is causing a seg. fault.  I'm not 100% sure what is trying to be accomplished, so I can't really make a patch.  I've CC'd the author of the change though, so that hopefully this bug can be resolved.

Comment 2 Mirko Banchi 2010-02-18 14:26:00 EST

Thank you very much Josh!I'll try to fix it very soon.

Comment 3 Mirko Banchi 2010-02-18 14:43:10 EST

I have made a new changeset for this bug in ns-3-dev. Now all should run fine. Let me know Josh. Thank you again.