Messages in this thread | | | Subject | Re: perf seg fault | From | Adrian Hunter <> | Date | Tue, 12 May 2020 18:45:24 +0300 |
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On 12/05/20 6:10 pm, Jiri Olsa wrote: > 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 >>> 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
It will require a kernel with support for bpf events otherwise the --no-bpf-event option would have no effect.
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