linux-kernel - Re: [BUG] perf: intel_pt won't display kernel function

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Date:   Thu, 4 Apr 2019 19:38:04 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <andi@...stfloor.org>,
        "jolsa@...nel.org" <jolsa@...nel.org>,
        "namhyung@...nel.org" <namhyung@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [BUG] perf: intel_pt won't display kernel function

On Thu, Apr 04, 2019 at 05:08:55PM +0000, Song Liu wrote:
> 
> 
> > On Apr 4, 2019, at 5:25 AM, Jiri Olsa <jolsa@...hat.com> wrote:
> > 
> > On Thu, Apr 04, 2019 at 11:14:38AM +0200, Jiri Olsa wrote:
> > 
> > SNIP
> > 
> >> Program received signal SIGABRT, Aborted.
> >> 0x00007ffff75e60f5 in raise () from /lib64/libc.so.6
> >> Missing separate debuginfos, use: dnf debuginfo-install bzip2-libs-1.0.6-29.fc30.x86_64 elfutils-libelf-0.176-1.fc30.x86_64 elfutils-libs-0.176-1.fc30.x86_64 libgcc-9.0.1-0.10.fc30.x86_64 libunwind-1.3.1-2.fc30.x86_64 libxcrypt-4.4.4-2.fc30.x86_64 numactl-libs-2.0.12-2.fc30.x86_64 perl-libs-5.28.1-434.fc30.x86_64 python2-libs-2.7.16-1.fc30.x86_64 slang-2.3.2-5.fc30.x86_64 xz-libs-5.2.4-5.fc30.x86_64 zlib-1.2.11-15.fc30.x86_64
> >> (gdb) bt
> >> #0  0x00007ffff75e60f5 in raise () from /lib64/libc.so.6
> >> #1  0x00007ffff75d0895 in abort () from /lib64/libc.so.6
> >> #2  0x00007ffff75d0769 in __assert_fail_base.cold () from /lib64/libc.so.6
> >> #3  0x00007ffff75de596 in __assert_fail () from /lib64/libc.so.6
> >> #4  0x00000000004fc006 in refcount_sub_and_test (i=1, r=0x1224e88) at /home/jolsa/linux/tools/include/linux/refcount.h:131
> >> #5  refcount_dec_and_test (r=0x1224e88) at /home/jolsa/linux/tools/include/linux/refcount.h:148
> >> #6  map__put (map=0x1224df0) at util/map.c:299
> >> #7  0x00000000004fdb95 in __maps__remove (map=0x1224df0, maps=0xb17d80) at util/map.c:953
> >> #8  maps__remove (maps=0xb17d80, map=0x1224df0) at util/map.c:959
> >> #9  0x00000000004f7d8a in map_groups__remove (map=<optimized out>, mg=<optimized out>) at util/map_groups.h:65
> >> #10 machine__process_ksymbol_unregister (sample=<optimized out>, event=0x7ffff7279670, machine=<optimized out>) at util/machine.c:728
> >> #11 machine__process_ksymbol (machine=<optimized out>, event=0x7ffff7279670, sample=<optimized out>) at util/machine.c:741
> >> #12 0x00000000004fffbb in perf_session__deliver_event (session=0xb11390, event=0x7ffff7279670, tool=0x7fffffffc7b0, file_offset=13936) at util/session.c:1362
> >> #13 0x00000000005039bb in do_flush (show_progress=false, oe=0xb17e80) at util/ordered-events.c:243
> >> #14 __ordered_events__flush (oe=0xb17e80, how=OE_FLUSH__ROUND, timestamp=<optimized out>) at util/ordered-events.c:322
> >> #15 0x00000000005005e4 in perf_session__process_user_event (session=session@...ry=0xb11390, event=event@...ry=0x7ffff72a4af8,
> >>    file_offset=file_offset@...ry=191224) at util/session.c:1402
> >> #16 0x000000000050091e in perf_session__process_event (file_offset=191224, event=0x7ffff72a4af8, session=0xb11390) at util/session.c:1529
> >> #17 process_simple (session=session@...ry=0xb11390, event=event@...ry=0x7ffff72a4af8, file_offset=file_offset@...ry=191224) at util/session.c:1962
> >> #18 0x0000000000501f44 in reader__process_events (prog=0x7fffffffc680, session=0xb11390, rd=<synthetic pointer>) at util/session.c:1931
> >> #19 __perf_session__process_events (session=0xb11390) at util/session.c:1985
> >> #20 perf_session__process_events (session=0xb11390) at util/session.c:2018
> >> #21 0x000000000045bb42 in __cmd_script (script=0x7fffffffc7b0) at builtin-script.c:2429
> >> #22 cmd_script (argc=<optimized out>, argv=<optimized out>) at builtin-script.c:3770
> >> #23 0x00000000004a65cb in run_builtin (p=p@...ry=0x994918 <commands+408>, argc=argc@...ry=4, argv=argv@...ry=0x7fffffffe160) at perf.c:303
> >> #24 0x000000000042da1e in handle_internal_command (argv=0x7fffffffe160, argc=4) at perf.c:355
> >> #25 run_argv (argcp=<synthetic pointer>, argv=<synthetic pointer>) at perf.c:399
> >> #26 main (argc=4, argv=0x7fffffffe160) at perf.c:521
> > 
> 
> For some reason, I cannot repro this issue. I tried to load two
> bpf programs with same name, but that doesn't trigger it either. 

for some reason I see multiple same name of bpf programs
on my setup.. need to check for the reason

> 
> 
> > 
> > we dont increase the map's reference for same name,
> > which we need to.. I assume we we re able to hit this
> > path with bpf maps/dso with same name
> > 
> > jirka
> 
> Does the following change fix the issue on your side?

yes, I'll post full patch later

jirka