[BUG] perf script segfault

[David Ahern]

Surprised Stephane has not hit this one yet:

$ perf record -e <any-event> -a | perf script
Segmentation fault (core dumped)

It's the second one that core dumps.

$ gdb perf core.16704
...
[New LWP 16704]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/tmp/perf/perf script'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  perf_tool__fill_defaults (tool=tool@entry=0x0) at util/session.c:259
259		if (tool->sample == NULL)
...
(gdb) bt
#0  perf_tool__fill_defaults (tool=tool@entry=0x0) at util/session.c:259
#1  0x00000000004a5baa in __perf_session__process_pipe_events 
(session=0x2178b80) at util/session.c:1178
#2  perf_session__process_events (session=0x2178b80) at util/session.c:1416
#3  0x000000000043c5dc in __cmd_script (script=0x7fffc7a4d840) at 
builtin-script.c:803
#4  cmd_script (argc=<optimized out>, argv=<optimized out>, 
prefix=<optimized out>) at builtin-script.c:1840
...

tool was moved to ordered_events and is not initialized for pipe mode. I 
don't have time to look into it more than that before PTO on Wednesday.

David
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