Messages in this thread | | | From | Anthony LaTorre <> | Date | Tue, 9 Oct 2018 15:18:12 -0500 | Subject | Re: perf report segfault |
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Ok, I can reliably reproduce it by profiling the following program:
#include <math.h>
int main(int argc, char **argv) { int i; double sum;
while (1) { sum += exp(++i); }
return 0; }
compiled with:
$ cc -o test test.c -lm
with the following command:
$ perf record -F 99 -p 20016 --call-graph dwarf sleep 10
Tony On Tue, Oct 9, 2018 at 1:54 PM Anthony LaTorre <tlatorre9@gmail.com> wrote: > > Can you reproduce the segfault from the perf.data file I provided? > > Tony > On Tue, Oct 9, 2018 at 11:47 AM Jiri Olsa <jolsa@redhat.com> wrote: > > > > On Tue, Oct 09, 2018 at 11:27:04AM -0500, Anthony LaTorre wrote: > > > Hi, > > > > > > I'm currently running Linux kernel 4.18.10-100.fc27.x86_64 and have a > > > problem profiling a program that used to work. Currently when I > > > profile the program with the following command: > > > > > > $ perf record -F 99 -p PID --call-graph dwarf sleep 10 > > > > > > it produces a data file which causes perf report to segfault: > > > > > > $ perf report > > > perf: Segmentation fault > > > -------- backtrace -------- > > > perf(+0x325302)[0x55860ae79302] > > > /lib64/libc.so.6(+0x347d0)[0x7fbc8f3987d0] > > > perf(+0x273e80)[0x55860adc7e80] > > > perf(unwind__get_entries+0x1d9)[0x55860ae4ace9] > > > perf(thread__resolve_callchain+0xfd)[0x55860adce7dd] > > > perf(sample__resolve_callchain+0x58)[0x55860adc45b8] > > > perf(hist_entry_iter__add+0x98)[0x55860adfa908] > > > perf(+0x1ab8d9)[0x55860acff8d9] > > > perf(+0x280603)[0x55860add4603] > > > perf(+0x283c63)[0x55860add7c63] > > > perf(+0x280e04)[0x55860add4e04] > > > perf(perf_session__process_events+0x8ae)[0x55860add6bee] > > > perf(cmd_report+0x190f)[0x55860ad01a4f] > > > perf(+0x21a961)[0x55860ad6e961] > > > perf(+0x21ac6e)[0x55860ad6ec6e] > > > perf(main+0x361)[0x55860ace8411] > > > /lib64/libc.so.6(__libc_start_main+0xea)[0x7fbc8f384fea] > > > perf(_start+0x2a)[0x55860ace889a] > > > > > > I've attached the data file which is causing the issue. > > > > > > The perf version is: > > > > > > $ perf --version > > > perf version 4.18.10 > > > > > > and I'm running Fedora 27 if that makes a difference. > > > > > > I've tried to reproduce with simpler programs so I could send a > > > minimal working example, but it doesn't appear to cause the issue. > > > > please do, I can't reproduce this > > > > thanks, > > jirka
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