Messages in this thread | | | Date | Sun, 04 Apr 2010 17:10:57 +0900 | From | Hitoshi Mitake <> | Subject | Floating point exception by perf record |
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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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