linux-kernel - Re: perf seg fault

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Date:   Tue, 12 May 2020 12:41:25 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: perf seg fault

Em Tue, May 12, 2020 at 05:10:43PM +0200, Jiri Olsa escreveu:
> On Tue, May 12, 2020 at 05:58:29PM +0300, Adrian Hunter wrote:
> > Forgot to cc mailing list
> > 
> > On 12/05/20 5:50 pm, Adrian Hunter wrote:
> > > Hi
> > > 
> > > I am getting a seg fault from your perf/core branch, as follows:
> > > 
> > > # perf record uname
> > > Linux
> > > [ perf record: Woken up 1 times to write data ]
> > > [ perf record: Captured and wrote 0.005 MB perf.data (7 samples) ]
> > > perf: Segmentation fault
> > > Obtained 6 stack frames.
> > > [0x4e75b4]
> > > [0x5d1ad0]
> > > [0x5c9860]
> > > [0x4a6e5c]
> > > [0x5cb39b]
> > > [0x76c89f]
> > > Segmentation fault
> > > 
> > > It goes away with --no-bpf-event:
> > > 
> > > # perf record --no-bpf-event uname
> > > Linux
> > > [ perf record: Woken up 1 times to write data ]
> > > [ perf record: Captured and wrote 0.005 MB perf.data (7 samples) ]
> > > #
> > > 
> > > kernel is from the same branch
> > > 
> > > # uname -a
> > > Linux buildroot 5.7.0-rc2-00028-g0fdddf5a583a #165 SMP Tue May 12 16:27:53
> > > EEST 2020 x86_64 GNU/Linux
> > > 
> > > # perf version --build-options
> > > perf version 5.6.g0fdddf5a583a
> > >                  dwarf: [ OFF ]  # HAVE_DWARF_SUPPORT
> > >     dwarf_getlocations: [ OFF ]  # HAVE_DWARF_GETLOCATIONS_SUPPORT
> > >                  glibc: [ on  ]  # HAVE_GLIBC_SUPPORT
> > >                   gtk2: [ OFF ]  # HAVE_GTK2_SUPPORT
> > >          syscall_table: [ on  ]  # HAVE_SYSCALL_TABLE_SUPPORT
> > >                 libbfd: [ on  ]  # HAVE_LIBBFD_SUPPORT
> > >                 libelf: [ on  ]  # HAVE_LIBELF_SUPPORT
> > >                libnuma: [ OFF ]  # HAVE_LIBNUMA_SUPPORT
> > > numa_num_possible_cpus: [ OFF ]  # HAVE_LIBNUMA_SUPPORT
> > >                libperl: [ OFF ]  # HAVE_LIBPERL_SUPPORT
> > >              libpython: [ OFF ]  # HAVE_LIBPYTHON_SUPPORT
> > >               libslang: [ on  ]  # HAVE_SLANG_SUPPORT
> > >              libcrypto: [ on  ]  # HAVE_LIBCRYPTO_SUPPORT
> > >              libunwind: [ OFF ]  # HAVE_LIBUNWIND_SUPPORT
> > >     libdw-dwarf-unwind: [ OFF ]  # HAVE_DWARF_SUPPORT
> > >                   zlib: [ OFF ]  # HAVE_ZLIB_SUPPORT
> > >                   lzma: [ OFF ]  # HAVE_LZMA_SUPPORT
> > >              get_cpuid: [ on  ]  # HAVE_AUXTRACE_SUPPORT
> > >                    bpf: [ OFF ]  # HAVE_LIBBPF_SUPPORT


Humm, maybe this?

make -C tools clean
rm -rf /tmp/build/perf
mkdir -p /tmp/build/perf
make -C tools/perf O=/tmp/build/perf install-bin

[root@...e ~]# perf -vv
perf version 5.7.rc2.g2dbd8814c26b
                 dwarf: [ on  ]  # HAVE_DWARF_SUPPORT
    dwarf_getlocations: [ on  ]  # HAVE_DWARF_GETLOCATIONS_SUPPORT
                 glibc: [ on  ]  # HAVE_GLIBC_SUPPORT
                  gtk2: [ on  ]  # HAVE_GTK2_SUPPORT
         syscall_table: [ on  ]  # HAVE_SYSCALL_TABLE_SUPPORT
                libbfd: [ on  ]  # HAVE_LIBBFD_SUPPORT
                libelf: [ on  ]  # HAVE_LIBELF_SUPPORT
               libnuma: [ on  ]  # HAVE_LIBNUMA_SUPPORT
numa_num_possible_cpus: [ on  ]  # HAVE_LIBNUMA_SUPPORT
               libperl: [ on  ]  # HAVE_LIBPERL_SUPPORT
             libpython: [ on  ]  # HAVE_LIBPYTHON_SUPPORT
              libslang: [ on  ]  # HAVE_SLANG_SUPPORT
             libcrypto: [ on  ]  # HAVE_LIBCRYPTO_SUPPORT
             libunwind: [ on  ]  # HAVE_LIBUNWIND_SUPPORT
    libdw-dwarf-unwind: [ on  ]  # HAVE_DWARF_SUPPORT
                  zlib: [ on  ]  # HAVE_ZLIB_SUPPORT
                  lzma: [ on  ]  # HAVE_LZMA_SUPPORT
             get_cpuid: [ on  ]  # HAVE_AUXTRACE_SUPPORT
                   bpf: [ OFF ]  # HAVE_LIBBPF_SUPPORT
                   aio: [ on  ]  # HAVE_AIO_SUPPORT
                  zstd: [ on  ]  # HAVE_ZSTD_SUPPORT
[root@...e ~]# perf record uname
Linux
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.029 MB perf.data (7 samples) ]
perf: Segmentation fault
Obtained 6 stack frames.
perf(sighandler_dump_stack+0x3e) [0x4fc7be]
/lib64/libc.so.6(+0x3c6af) [0x7f073b8a16af]
perf(perf_mmap__read_init+0x20) [0x5d9570]
perf() [0x4c7758]
/lib64/libpthread.so.0(+0x94e1) [0x7f073c28a4e1]
/lib64/libc.so.6(clone+0x42) [0x7f073b9666a2]
Segmentation fault (core dumped)
[root@...e ~]#

?

> > >                    aio: [ on  ]  # HAVE_AIO_SUPPORT
> > >                   zstd: [ OFF ]  # HAVE_ZSTD_SUPPORT
> > > 
> > > 
> > > Any thoughts?
> 
> hum, I don't see that, do you reproduce with DEBUG=1?
> to get more verbose backtrace

[root@...e ~]# uname -a
Linux five 5.7.0-rc2 #1 SMP Tue Apr 21 11:06:25 -03 2020 x86_64 x86_64 x86_64 GNU/Linux
[root@...e ~]# perf record uname
Linux
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.030 MB perf.data (7 samples) ]
[root@...e ~]# uname -a
Linux five 5.7.0-rc2 #1 SMP Tue Apr 21 11:06:25 -03 2020 x86_64 x86_64 x86_64 GNU/Linux
[root@...e ~]#

[root@...e ~]# uname -a
Linux five 5.7.0-rc2 #1 SMP Tue Apr 21 11:06:25 -03 2020 x86_64 x86_64 x86_64 GNU/Linux
[root@...e ~]# perf -vv
perf version 5.7.rc2.g2dbd8814c26b
                 dwarf: [ on  ]  # HAVE_DWARF_SUPPORT
    dwarf_getlocations: [ on  ]  # HAVE_DWARF_GETLOCATIONS_SUPPORT
                 glibc: [ on  ]  # HAVE_GLIBC_SUPPORT
                  gtk2: [ on  ]  # HAVE_GTK2_SUPPORT
         syscall_table: [ on  ]  # HAVE_SYSCALL_TABLE_SUPPORT
                libbfd: [ on  ]  # HAVE_LIBBFD_SUPPORT
                libelf: [ on  ]  # HAVE_LIBELF_SUPPORT
               libnuma: [ on  ]  # HAVE_LIBNUMA_SUPPORT
numa_num_possible_cpus: [ on  ]  # HAVE_LIBNUMA_SUPPORT
               libperl: [ on  ]  # HAVE_LIBPERL_SUPPORT
             libpython: [ on  ]  # HAVE_LIBPYTHON_SUPPORT
              libslang: [ on  ]  # HAVE_SLANG_SUPPORT
             libcrypto: [ on  ]  # HAVE_LIBCRYPTO_SUPPORT
             libunwind: [ on  ]  # HAVE_LIBUNWIND_SUPPORT
    libdw-dwarf-unwind: [ on  ]  # HAVE_DWARF_SUPPORT
                  zlib: [ on  ]  # HAVE_ZLIB_SUPPORT
                  lzma: [ on  ]  # HAVE_LZMA_SUPPORT
             get_cpuid: [ on  ]  # HAVE_AUXTRACE_SUPPORT
                   bpf: [ on  ]  # HAVE_LIBBPF_SUPPORT
                   aio: [ on  ]  # HAVE_AIO_SUPPORT
                  zstd: [ on  ]  # HAVE_ZSTD_SUPPORT
[root@...e ~]#