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Date:	Sun, 04 Apr 2010 17:10:57 +0900
From:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Floating point exception by perf record


Hi Arnaldo,

I suffered a mysterious floating point exception when executing perf
on current tip/master.

For example,

% sudo ./perf lock record ./perf bench sched messaging
# Running sched/messaging benchmark...
# 20 sender and receiver processes per group
# 10 groups == 400 processes run

      Total time: 1.375 [sec]
[ perf record: Woken up 0 times to write data ]
[ perf record: Captured and wrote 160.002 MB perf.data (~6990599 samples) ]
[1]    26348 floating point exception  sudo ./perf lock record ./perf 
bench sched messaging

dmesg says that

[10212.752490] perf[26348] trap divide error ip:7fade8564310 
sp:7fff46d926e8 error:0 in libnewt.so.0.52.2[7fade8556000+15000]

Example is of perf lock, but this is not a special phenomenon of perf lock,
other users of perf record, like perf sched, caused the same problem.

I found that this might be caused by the line 283 of perf.c

	if (fclose(stdout)) # <- closing stdout!
		die("close failed on standard output: %s", strerror(errno));

I don't know well about libnewt, do you know something like cause?

The version of libnewt I'm using is 0.52.2 (default of Debian lenny)

Thanks,
	Hitoshi
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