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![]() The buffer is used to save register mapping in a sample. Normally
perf samples don't have any register so the string should be empty.
But it missed to initialize the buffer when the size is 0. And it's
passed to PyUnicode_FromString() with a garbage data.
So it returns NULL due to invalid input (instead of an empty unicode
string object) which causes a segfault like below:
Thread 2.1 "perf" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff7c83780 (LWP 193775)]
0x00007ffff6dbca2e in PyDict_SetItem () from /lib/x86_64-linux-gnu/libpython3.11.so.1.0
(gdb) bt
#0 0x00007ffff6dbca2e in PyDict_SetItem () from /lib/x86_64-linux-gnu/libpython3.11.so.1.0
#1 0x00007ffff6dbf848 in PyDict_SetItemString () from /lib/x86_64-linux-gnu/libpython3.11.so.1.0
#2 0x000055555575824d in pydict_set_item_string_decref (val=0x0, key=0x5555557f96e3 "iregs", dict=0x7ffff5f7f780)
at util/scripting-engines/trace-event-python.c:145
#3 set_regs_in_dict (evsel=0x555555efc370, sample=0x7fffffffb870, dict=0x7ffff5f7f780)
at util/scripting-engines/trace-event-python.c:776
#4 get_perf_sample_dict (sample=sample@entry=0x7fffffffb870, evsel=evsel@entry=0x555555efc370, al=al@entry=0x7fffffffb2e0,
addr_al=addr_al@entry=0x0, callchain=callchain@entry=0x7ffff63ef440) at util/scripting-engines/trace-event-python.c:923
#5 0x0000555555758ec1 in python_process_tracepoint (sample=0x7fffffffb870, evsel=0x555555efc370, al=0x7fffffffb2e0, addr_al=0x0)
at util/scripting-engines/trace-event-python.c:1044
#6 0x00005555555c5db8 in process_sample_event (tool=<optimized out>, event=<optimized out>, sample=<optimized out>,
evsel=0x555555efc370, machine=0x555555ef4d68) at builtin-script.c:2421
#7 0x00005555556b7793 in perf_session__deliver_event (session=0x555555ef4b60, event=0x7ffff62ff7d0, tool=0x7fffffffc150,
file_offset=30672, file_path=0x555555efb8a0 "perf.data") at util/session.c:1639
#8 0x00005555556bc864 in do_flush (show_progress=true, oe=0x555555efb700) at util/ordered-events.c:245
#9 __ordered_events__flush (oe=oe@entry=0x555555efb700, how=how@entry=OE_FLUSH__FINAL, timestamp=timestamp@entry=0)
at util/ordered-events.c:324
#10 0x00005555556bd06e in ordered_events__flush (oe=oe@entry=0x555555efb700, how=how@entry=OE_FLUSH__FINAL)
at util/ordered-events.c:342
#11 0x00005555556b9d63 in __perf_session__process_events (session=0x555555ef4b60) at util/session.c:2465
#12 perf_session__process_events (session=0x555555ef4b60) at util/session.c:2627
#13 0x00005555555cb1d0 in __cmd_script (script=0x7fffffffc150) at builtin-script.c:2839
#14 cmd_script (argc=<optimized out>, argv=<optimized out>) at builtin-script.c:4365
#15 0x0000555555650811 in run_builtin (p=p@entry=0x555555ed8948 <commands+456>, argc=argc@entry=4, argv=argv@entry=0x7fffffffe240)
at perf.c:323
#16 0x0000555555597eb3 in handle_internal_command (argv=0x7fffffffe240, argc=4) at perf.c:377
#17 run_argv (argv=<synthetic pointer>, argcp=<synthetic pointer>) at perf.c:421
#18 main (argc=4, argv=0x7fffffffe240) at perf.c:537
Fixes:
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.. | ||
Build | ||
trace-event-perl.c | ||
trace-event-python.c |