Re: 'perf stat --bpf-counters test' failures

[Jiri Olsa <jolsa@redhat.com>]

On Fri, Nov 19, 2021 at 09:28:15AM -0300, Arnaldo Carvalho de Melo wrote:
> 
> After I updated to fedora 35 I started seeing the errors below,
> it may well not be related to that, maybe something on libbpf, haven't
> investigated, have you seen this?

yep, it seems the perf bench is broken so the counts won't correlated
if I revert this one:
  92723ea0f11d perf bench: Fix two memory leaks detected with ASan

it works for me again.. it seems to break -t option

Sohaib, could you please check on that?

	[root@dell-r440-01 perf]# ./perf bench sched messaging -g 1 -l 100 -t
	# Running 'sched/messaging' benchmark:
	RRRperf: CLIENT: ready write: Bad file descriptor
	Rperf: SENDER: write: Bad file descriptor

thanks,
jirka

> 
> ⬢[acme@toolbox perf]$ perf -vv
> perf version 5.16.rc1.gfa2b5229b222
>                  dwarf: [ on  ]  # HAVE_DWARF_SUPPORT
>     dwarf_getlocations: [ on  ]  # HAVE_DWARF_GETLOCATIONS_SUPPORT
>                  glibc: [ on  ]  # HAVE_GLIBC_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
>                libpfm4: [ OFF ]  # HAVE_LIBPFM
> ⬢[acme@toolbox perf]$
> 
> This is with what I have now in my perf/urgent branch, the csets there
> aren't related:
> 
> ⬢[acme@toolbox perf]$ git log --oneline torvalds/master..
> b194c9cd09dd98af (HEAD -> perf/urgent, quaco/perf/urgent, acme/tmp.perf/urgent, acme/perf/urgent) perf evsel: Fix memory leaks relating to unit
> d9fc706108c15f8b perf report: Fix memory leaks around perf_tip()
> 0ca1f534a776cc7d perf hist: Fix memory leak of a perf_hpp_fmt
> 8b8dcc3720d57d88 tools headers UAPI: Sync MIPS syscall table file changed by new futex_waitv syscall
> e8c04ea0fef5731d tools build: Fix removal of feature-sync-compare-and-swap feature detection
> 9e1a8d9f683260d5 perf inject: Fix ARM SPE handling
> 92723ea0f11d9249 perf bench: Fix two memory leaks detected with ASan
> cb5a63feae2d963c perf test sample-parsing: Fix branch_stack entry endianness check
> 162b944598344fd7 tools headers UAPI: Sync x86's asm/kvm.h with the kernel sources
> db4b284029099224 perf sort: Fix the 'p_stage_cyc' sort key behavior
> 4d03c75363eeca86 perf sort: Fix the 'ins_lat' sort key behavior
> 784e8adda4cdb3e2 perf sort: Fix the 'weight' sort key behavior
> 70f9c9b2df1dd12c perf tools: Set COMPAT_NEED_REALLOCARRAY for CONFIG_AUXTRACE=1
> ccb05590c4325ce5 perf tests wp: Remove unused functions on s390
> 346e91998cba46b6 tools headers UAPI: Sync linux/kvm.h with the kernel sources
> b075c1d81e7d0e96 tools headers cpufeatures: Sync with the kernel sources
> ⬢[acme@toolbox perf]$
> 
> - Arnaldo
> 
> [acme@quaco perf]$ uname -a
> Linux quaco 5.14.17-301.fc35.x86_64 #1 SMP Mon Nov 8 13:57:43 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
> 
> 91: perf stat --bpf-counters test                                   :RRRRRRRRRRRRR FAILED!
> 92: Check Arm CoreSight trace data recording and synthesized samples: Skip
> 93: Check Arm SPE trace data recording and synthesized samples      : Skip
> 94: Check open filename arg using perf trace + vfs_getname          : Ok
> [root@quaco ~]# perf test 91
> 91: perf stat --bpf-counters test                                   :RRRRRRRRRRRRR FAILED!
> [root@quaco ~]# perf test 91
> 91: perf stat --bpf-counters test                                   :RRRRRRRRRRRRR FAILED!
> [root@quaco ~]# perf test 91
> 91: perf stat --bpf-counters test                                   :RRRRRRRRRRRR FAILED!
> [root@quaco ~]# perf test 91
> 91: perf stat --bpf-counters test                                   :RRRRRRRRRRRRRRRRRR Ok
> [root@quaco ~]# perf test 91
> 91: perf stat --bpf-counters test                                   :RRRRRRRRR FAILED!
> [root@quaco ~]# perf test 91
> 91: perf stat --bpf-counters test                                   :RRRRRRRRRRR Ok
> [root@quaco ~]# perf test 91
> 91: perf stat --bpf-counters test                                   :RRRRRRRRRRRRRRR Ok
> [root@quaco ~]# uname -a
> Linux quaco 5.14.17-301.fc35.x86_64 #1 SMP Mon Nov 8 13:57:43 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
> [root@quaco ~]# set -o vi
> [root@quaco ~]# perf test -v 91
> 91: perf stat --bpf-counters test                                   :
> --- start ---
> test child forked, pid 30079
> RRRRRRRRRRRRRRRRRThe difference between 31599305 and 36265639 are greater than 10%.
> test child finished with -1
> ---- end ----
> perf stat --bpf-counters test: FAILED!
> [root@quaco ~]# perf test -v 91
> 91: perf stat --bpf-counters test                                   :
> --- start ---
> test child forked, pid 30170
> RRRRRRRRRRRRRRRRRRRRRRRRThe difference between 33311934 and 36973889 are greater than 10%.
> test child finished with -1
> ---- end ----
> perf stat --bpf-counters test: FAILED!
> [root@quaco ~]# perf test -v 91
> 91: perf stat --bpf-counters test                                   :
> --- start ---
> test child forked, pid 30257
> RRRRRRRRRRRRRRRRRThe difference between 31420157 and 36680527 are greater than 10%.
> test child finished with -1
> ---- end ----
> perf stat --bpf-counters test: FAILED!
> [root@quaco ~]# perf test -v 91
> 91: perf stat --bpf-counters test                                   :
> --- start ---
> test child forked, pid 30341
> RRRRRRRRRRRRRRRRRRRThe difference between 32451720 and 36750342 are greater than 10%.
> test child finished with -1
> ---- end ----
> perf stat --bpf-counters test: FAILED!
> [root@quaco ~]# perf test -v 91
> 91: perf stat --bpf-counters test                                   :
> --- start ---
> test child forked, pid 30433
> RRRRRRRRRRRRRRRRRRtest child finished with 0
> ---- end ----
> perf stat --bpf-counters test: Ok
> [root@quaco ~]#
>