linux-kernel - Re: perf seg fault

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Date:   Tue, 12 May 2020 17:58:29 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: perf seg fault

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
>                    aio: [ on  ]  # HAVE_AIO_SUPPORT
>                   zstd: [ OFF ]  # HAVE_ZSTD_SUPPORT
> 
> 
> Any thoughts?
> 
> Regards
> Adrian
> 
>