Re: perf test BPF failing on 4.15.0-rc6

From: Arnaldo Carvalho de Melo
Date: Wed Jan 03 2018 - 11:58:54 EST

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Em Wed, Jan 03, 2018 at 12:58:26PM +0800, Wangnan (F) escreveu:
> And please check if the kprobe created by
>
> $ perf probe -v SyS_epoll_wait

[root@seventh ~]# perf probe -v SyS_epoll_wait
probe-definition(0): SyS_epoll_wait
symbol:SyS_epoll_wait file:(null) line:0 offset:0 return:0 lazy:(null)
0 arguments
Looking at the vmlinux_path (8 entries long)
Using /usr/lib/debug/lib/modules/4.14.8-300.fc27.x86_64/vmlinux for symbols
Open Debuginfo file: /usr/lib/debug/lib/modules/4.14.8-300.fc27.x86_64/vmlinux
Try to find probe point from debuginfo.
Matched function: SyS_epoll_wait [314b563]
found inline addr: 0xffffffff812d8087
Probe point found: compat_SyS_epoll_pwait+151
found inline addr: 0xffffffff812d7e5a
Probe point found: SyS_epoll_pwait+138
found inline addr: 0xffffffff812d7cf0
Probe point found: SyS_epoll_wait+0
Found 3 probe_trace_events.
Opening /sys/kernel/debug/tracing//kprobe_events write=1
Writing event: p:probe/SyS_epoll_wait _text+2982023
Writing event: p:probe/SyS_epoll_wait_1 _text+2981466
Writing event: p:probe/SyS_epoll_wait_2 _text+2981104
Added new events:
probe:SyS_epoll_wait (on SyS_epoll_wait)
probe:SyS_epoll_wait_1 (on SyS_epoll_wait)
probe:SyS_epoll_wait_2 (on SyS_epoll_wait)

You can now use it in all perf tools, such as:

perf record -e probe:SyS_epoll_wait_2 -aR sleep 1

[root@seventh ~]#

Then, with your proggie, it seems its glibc that now maps epoll_wait()
to a different syscall than in older systems:

[root@seventh ~]# trace -e probe:SyS_epoll_wait* ~acme/epoll
0.018 ( 0.001 ms): epoll/20444 brk( ) = 0x2600000
0.029 ( 0.004 ms): epoll/20444 access(filename: 0xe874ec0, mode: R ) = -1 ENOENT No such file or directory
0.035 ( 0.003 ms): epoll/20444 openat(dfd: CWD, filename: 0xe872726, flags: CLOEXEC ) = 3
0.040 ( 0.002 ms): epoll/20444 fstat(fd: 3, statbuf: 0x7fffcc37b830 ) = 0
0.042 ( 0.002 ms): epoll/20444 mmap(len: 109538, prot: READ, flags: PRIVATE, fd: 3 ) = 0x7fc50ea5d000
0.045 ( 0.001 ms): epoll/20444 close(fd: 3 ) = 0
0.052 ( 0.003 ms): epoll/20444 openat(dfd: CWD, filename: 0xea7ace0, flags: CLOEXEC ) = 3
0.056 ( 0.001 ms): epoll/20444 read(fd: 3, buf: 0x7fffcc37b9f8, count: 832 ) = 832
0.059 ( 0.001 ms): epoll/20444 fstat(fd: 3, statbuf: 0x7fffcc37b890 ) = 0
0.060 ( 0.002 ms): epoll/20444 mmap(len: 8192, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS, fd: -1 ) = 0x7fc50ea5b000
0.065 ( 0.003 ms): epoll/20444 mmap(len: 4074112, prot: EXEC|READ, flags: PRIVATE|DENYWRITE, fd: 3 ) = 0x7fc50e46e000
0.068 ( 0.004 ms): epoll/20444 mprotect(start: 0x7fc50e648000, len: 2093056 ) = 0
0.073 ( 0.004 ms): epoll/20444 mmap(addr: 0x7fc50e847000, len: 24576, prot: READ|WRITE, flags: PRIVATE|DENYWRITE|FIXED, fd: 3, off: 1937408) = 0x7fc50e847000
0.079 ( 0.002 ms): epoll/20444 mmap(addr: 0x7fc50e84d000, len: 14976, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS|FIXED, fd: -1) = 0x7fc50e84d000
0.085 ( 0.001 ms): epoll/20444 close(fd: 3 ) = 0
0.093 ( 0.001 ms): epoll/20444 arch_prctl(option: 4098, arg2: 140484331029696 ) = 0
0.128 ( 0.003 ms): epoll/20444 mprotect(start: 0x7fc50e847000, len: 16384, prot: READ ) = 0
0.133 ( 0.002 ms): epoll/20444 mprotect(start: 0x600000, len: 4096, prot: READ ) = 0
0.137 ( 0.002 ms): epoll/20444 mprotect(start: 0x7fc50ea78000, len: 4096, prot: READ ) = 0
0.140 ( 0.005 ms): epoll/20444 munmap(addr: 0x7fc50ea5d000, len: 109538 ) = 0
0.159 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -1, sigsetsize: 8 ) = -22
0.160 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -2, sigsetsize: 8 ) = -22
0.162 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -3, sigsetsize: 8 ) = -22
0.163 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -4, sigsetsize: 8 ) = -22
0.165 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -5, sigsetsize: 8 ) = -22
<SNIP>
0.279 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -85, sigsetsize: 8 ) = -22
0.280 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -86, sigsetsize: 8 ) = -22
0.282 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -87, sigsetsize: 8 ) = -22
0.283 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -88, sigsetsize: 8 ) = -22
0.284 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -89, sigsetsize: 8 ) = -22
0.286 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -90, sigsetsize: 8 ) = -22
0.287 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -91, sigsetsize: 8 ) = -22
0.289 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -92, sigsetsize: 8 ) = -22
0.290 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -93, sigsetsize: 8 ) = -22
0.292 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -94, sigsetsize: 8 ) = -22
0.293 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -95, sigsetsize: 8 ) = -22
0.294 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -96, sigsetsize: 8 ) = -22
0.296 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -97, sigsetsize: 8 ) = -22
0.297 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -98, sigsetsize: 8 ) = -22
0.299 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -99, sigsetsize: 8 ) = -22
0.300 ( 0.001 ms): epoll/20444 epoll_pwait(epfd: -100, sigsetsize: 8 ) = -22
0.305 ( ? ): epoll/20444 exit_group( )
[root@seventh ~]#

This is on a Fedora 27 system, that has glibc 2.26, while on a RHEL7
machine, that has glibc 2.17, it still uses epoll_wait() and we get:

[root@felicio ~]# trace ./epoll
0.018 ( 0.001 ms): epoll/2818 brk( ) = 0x8e5000
0.033 ( 0.002 ms): epoll/2818 mmap(len: 4096, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS ) = 0x7f3f738e3000
0.041 ( 0.004 ms): epoll/2818 access(filename: 0x736e2160, mode: R ) = -1 ENOENT No such file or directory
0.051 ( 0.003 ms): epoll/2818 open(filename: 0x736e0a58, flags: CLOEXEC ) = 3
0.056 ( 0.001 ms): epoll/2818 fstat(fd: 3, statbuf: 0x7fff8b35f5b0 ) = 0
0.057 ( 0.002 ms): epoll/2818 mmap(len: 78559, prot: READ, flags: PRIVATE, fd: 3 ) = 0x7f3f738cf000
0.060 ( 0.001 ms): epoll/2818 close(fd: 3 ) = 0
0.070 ( 0.005 ms): epoll/2818 open(filename: 0x738e3640, flags: CLOEXEC ) = 3
0.076 ( 0.001 ms): epoll/2818 read(fd: 3, buf: 0x7fff8b35f770, count: 832 ) = 832
0.079 ( 0.001 ms): epoll/2818 fstat(fd: 3, statbuf: 0x7fff8b35f610 ) = 0
0.082 ( 0.003 ms): epoll/2818 mmap(len: 3932672, prot: EXEC|READ, flags: PRIVATE|DENYWRITE, fd: 3 ) = 0x7f3f73304000
0.086 ( 0.005 ms): epoll/2818 mprotect(start: 0x7f3f734bb000, len: 2093056 ) = 0
0.091 ( 0.005 ms): epoll/2818 mmap(addr: 0x7f3f736ba000, len: 24576, prot: READ|WRITE, flags: PRIVATE|DENYWRITE|FIXED, fd: 3, off: 1794048) = 0x7f3f736ba000
0.100 ( 0.003 ms): epoll/2818 mmap(addr: 0x7f3f736c0000, len: 16896, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS|FIXED) = 0x7f3f736c0000
0.106 ( 0.001 ms): epoll/2818 close(fd: 3 ) = 0
0.115 ( 0.002 ms): epoll/2818 mmap(len: 4096, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS ) = 0x7f3f738ce000
0.119 ( 0.002 ms): epoll/2818 mmap(len: 8192, prot: READ|WRITE, flags: PRIVATE|ANONYMOUS ) = 0x7f3f738cc000
0.123 ( 0.001 ms): epoll/2818 arch_prctl(option: 4098, arg2: 139910498273088, arg3: 139910498275408, arg4: 34, arg5: -1) = 0
0.181 ( 0.003 ms): epoll/2818 mprotect(start: 0x7f3f736ba000, len: 16384, prot: READ ) = 0
0.186 ( 0.002 ms): epoll/2818 mprotect(start: 0x600000, len: 4096, prot: READ ) = 0
0.190 ( 0.002 ms): epoll/2818 mprotect(start: 0x7f3f738e4000, len: 4096, prot: READ ) = 0
0.193 ( 0.004 ms): epoll/2818 munmap(addr: 0x7f3f738cf000, len: 78559 ) = 0
0.218 ( 0.001 ms): epoll/2818 epoll_wait(epfd: -1 ) = -1 EINVAL Invalid argument
0.220 ( 0.000 ms): epoll/2818 epoll_wait(epfd: -2 ) = -1 EINVAL Invalid argument
0.221 ( 0.000 ms): epoll/2818 epoll_wait(epfd: -3 ) = -1 EINVAL Invalid argument
0.221 ( 0.000 ms): epoll/2818 epoll_wait(epfd: -4 ) = -1 EINVAL Invalid argument
0.222 ( 0.000 ms): epoll/2818 epoll_wait(epfd: -5 ) = -1 EINVAL Invalid argument
<SNIP>

It thought that this part would cover it:

Probe point found: SyS_epoll_pwait+138
found inline addr: 0xffffffff812d7cf0

Continuing investigation...

- Arnaldo

> works for the test program used by this testcase:
>
> #include <sys/epoll.h>
> #include <stdlib.h>
>
> #define NR_ITERS 100
>
> static int epoll_wait_loop(void)
> {
> int i;
>
> /* Should fail NR_ITERS times */
> for (i = 0; i < NR_ITERS; i++)
> epoll_wait(-(i + 1), NULL, 0, 0);
> return 0;
> }
>
> int main()
> {
> epoll_wait_loop();
> return 0;
> }
>
> In my configuration it gives 100 samples:
>
> $ sudo ./perf record -e probe:SyS_epoll_wait /tmp/a.out
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.016 MB perf.data (100 samples) ]
>
> I guess in your configuration you would get 3 tracepoints, and can get 0
> sample from them.
>
> Thank you.
>
> On 2018/1/3 12:42, Wangnan (F) wrote:
> > Unable to reproduce. In my kernel configuration, SyS_epoll_wait is not
> > inlined at all.
> >
> > From the log you sent, it seems that all 3 instances are attached. This
> > testcase should work if the last one (SyS_epoll_wait) get probed
> > correctly.
> >
> > Could you please have a look if the 3rd kprobe event
> > (p:perf_bpf_probe/func_2 _text+2845824) works?
> >
> > Thank you.
> >
> > On 2018/1/3 2:59, Arnaldo Carvalho de Melo wrote:
> > > Hi Wang,
> > >
> > > I just updated my machine to Fedora 27 and 4.15.0-rc6 and the
> > > only test failing for me is:
> > >
> > > [root@jouet linux]# perf test bpf
> > > 39: BPF filter :
> > > 39.1: Basic BPF filtering : FAILED!
> > > 39.2: BPF pinning : Skip
> > > 39.3: BPF prologue generation : Skip
> > > 39.4: BPF relocation checker : Skip
> > > [root@jouet linux]#
> > >
> > > I haven't checked but perhaps the problem is that SyS_epoll_wait seems
> > > to now be inlined in three places and perhaps the eBPF proggie is being
> > > added to just one of them?
> > >
> > > Seemingly relevant excerpt:
> > >
> > > Open Debuginfo file: /lib/modules/4.15.0-rc6/build/vmlinux
> > > Try to find probe point from debuginfo.
> > > Matched function: SyS_epoll_wait [2f40eb7]
> > > found inline addr: 0xffffffff812b6ff1
> > > Probe point found: compat_SyS_epoll_pwait+129
> > > found inline addr: 0xffffffff812b6de7
> > > Probe point found: SyS_epoll_pwait+135
> > > found inline addr: 0xffffffff812b6c80
> > > Probe point found: SyS_epoll_wait+0
> > > Found 3 probe_trace_events.
> > >
> > > - Arnaldo
> > >
> > > P.S.: Full -v output:
> > >
> > > [root@jouet linux]# uname -a
> > > Linux jouet 4.15.0-rc6 #4 SMP Tue Jan 2 14:30:53 -03 2018 x86_64
> > > x86_64 x86_64 GNU/Linux
> > > [root@jouet linux]# gcc -v
> > > Using built-in specs.
> > > COLLECT_GCC=/usr/bin/gcc
> > > COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/7/lto-wrapper
> > > OFFLOAD_TARGET_NAMES=nvptx-none
> > > OFFLOAD_TARGET_DEFAULT=1
> > > Target: x86_64-redhat-linux
> > > Configured with: ../configure --enable-bootstrap
> > > --enable-languages=c,c++,objc,obj-c++,fortran,ada,go,lto
> > > --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info
> > > --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared
> > > --enable-threads=posix --enable-checking=release --enable-multilib
> > > --with-system-zlib --enable-__cxa_atexit
> > > --disable-libunwind-exceptions --enable-gnu-unique-object
> > > --enable-linker-build-id --with-gcc-major-version-only
> > > --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array
> > > --with-isl --enable-libmpx --enable-offload-targets=nvptx-none
> > > --without-cuda-driver --enable-gnu-indirect-function
> > > --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
> > > Thread model: posix
> > > gcc version 7.2.1 20170915 (Red Hat 7.2.1-2) (GCC)
> > > [root@jouet linux]# clang -v
> > > clang version 6.0.0 (http://llvm.org/git/clang.git
> > > 56cc8f8880db2ebc433eeb6b6a707c101467a186)
> > > (http://llvm.org/git/llvm.git
> > > 3656d83960a4f3fedf6d8f19043abf52379f78c3)
> > > Target: x86_64-unknown-linux-gnu
> > > Thread model: posix
> > > InstalledDir: /usr/local/bin
> > > Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/7
> > > Selected GCC installation: /usr/lib/gcc/x86_64-redhat-linux/7
> > > Candidate multilib: .;@m64
> > > Candidate multilib: 32;@m32
> > > Selected multilib: .;@m64
> > > [root@jouet linux]# perf test -v BPF
> > > 39: BPF filter :
> > > 39.1: Basic BPF filtering :
> > > --- start ---
> > > test child forked, pid 24304
> > > Kernel build dir is set to /lib/modules/4.15.0-rc6/build
> > > set env: KBUILD_DIR=/lib/modules/4.15.0-rc6/build
> > > unset env: KBUILD_OPTS
> > > include option is set to -nostdinc -isystem
> > > /usr/lib/gcc/x86_64-redhat-linux/7/include
> > > -I/home/acme/git/linux/arch/x86/include
> > > -I./arch/x86/include/generated -I/home/acme/git/linux/include
> > > -I./include -I/home/acme/git/linux/arch/x86/include/uapi
> > > -I./arch/x86/include/generated/uapi
> > > -I/home/acme/git/linux/include/uapi -I./include/generated/uapi
> > > -include /home/acme/git/linux/include/linux/kconfig.h
> > > set env: NR_CPUS=4
> > > set env: LINUX_VERSION_CODE=0x40f00
> > > set env: CLANG_EXEC=/usr/local/bin/clang
> > > set env: CLANG_OPTIONS=-xc
> > > set env: KERNEL_INC_OPTIONS= -nostdinc -isystem
> > > /usr/lib/gcc/x86_64-redhat-linux/7/include
> > > -I/home/acme/git/linux/arch/x86/include
> > > -I./arch/x86/include/generated -I/home/acme/git/linux/include
> > > -I./include -I/home/acme/git/linux/arch/x86/include/uapi
> > > -I./arch/x86/include/generated/uapi
> > > -I/home/acme/git/linux/include/uapi -I./include/generated/uapi
> > > -include /home/acme/git/linux/include/linux/kconfig.h
> > > set env: WORKING_DIR=/lib/modules/4.15.0-rc6/build
> > > set env: CLANG_SOURCE=-
> > > llvm compiling command template: echo '/*
> > > * bpf-script-example.c
> > > * Test basic LLVM building
> > > */
> > > #ifndef LINUX_VERSION_CODE
> > > # error Need LINUX_VERSION_CODE
> > > # error Example: for 4.2 kernel, put
> > > 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of
> > > ~/.perfconfig'
> > > #endif
> > > #define BPF_ANY 0
> > > #define BPF_MAP_TYPE_ARRAY 2
> > > #define BPF_FUNC_map_lookup_elem 1
> > > #define BPF_FUNC_map_update_elem 2
> > >
> > > static void *(*bpf_map_lookup_elem)(void *map, void *key) =
> > > (void *) BPF_FUNC_map_lookup_elem;
> > > static void *(*bpf_map_update_elem)(void *map, void *key, void
> > > *value, int flags) =
> > > (void *) BPF_FUNC_map_update_elem;
> > >
> > > struct bpf_map_def {
> > > unsigned int type;
> > > unsigned int key_size;
> > > unsigned int value_size;
> > > unsigned int max_entries;
> > > };
> > >
> > > #define SEC(NAME) __attribute__((section(NAME), used))
> > > struct bpf_map_def SEC("maps") flip_table = {
> > > .type = BPF_MAP_TYPE_ARRAY,
> > > .key_size = sizeof(int),
> > > .value_size = sizeof(int),
> > > .max_entries = 1,
> > > };
> > >
> > > SEC("func=SyS_epoll_wait")
> > > int bpf_func__SyS_epoll_wait(void *ctx)
> > > {
> > > int ind =0;
> > > int *flag = bpf_map_lookup_elem(&flip_table, &ind);
> > > int new_flag;
> > > if (!flag)
> > > return 0;
> > > /* flip flag and store back */
> > > new_flag = !*flag;
> > > bpf_map_update_elem(&flip_table, &ind, &new_flag, BPF_ANY);
> > > return new_flag;
> > > }
> > > char _license[] SEC("license") = "GPL";
> > > int _version SEC("version") = LINUX_VERSION_CODE;
> > > ' | $CLANG_EXEC -D__KERNEL__ -D__NR_CPUS__=$NR_CPUS
> > > -DLINUX_VERSION_CODE=$LINUX_VERSION_CODE $CLANG_OPTIONS
> > > $KERNEL_INC_OPTIONS -Wno-unused-value -Wno-pointer-sign
> > > -working-directory $WORKING_DIR -c "$CLANG_SOURCE" -target bpf -O2
> > > -o -
> > > libbpf: loading object '[basic_bpf_test]' from buffer
> > > libbpf: section .strtab, size 120, link 0, flags 0, type=3
> > > libbpf: section .text, size 0, link 0, flags 6, type=1
> > > libbpf: section func=SyS_epoll_wait, size 192, link 0, flags 6, type=1
> > > libbpf: found program func=SyS_epoll_wait
> > > libbpf: section .relfunc=SyS_epoll_wait, size 32, link 8, flags 0,
> > > type=9
> > > libbpf: section maps, size 16, link 0, flags 3, type=1
> > > libbpf: section license, size 4, link 0, flags 3, type=1
> > > libbpf: license of [basic_bpf_test] is GPL
> > > libbpf: section version, size 4, link 0, flags 3, type=1
> > > libbpf: kernel version of [basic_bpf_test] is 40f00
> > > libbpf: section .symtab, size 168, link 1, flags 0, type=2
> > > libbpf: maps in [basic_bpf_test]: 1 maps in 16 bytes
> > > libbpf: map 0 is "flip_table"
> > > libbpf: collecting relocating info for: 'func=SyS_epoll_wait'
> > > libbpf: relocation: insn_idx=4
> > > libbpf: relocation: find map 0 (flip_table) for insn 4
> > > libbpf: relocation: insn_idx=17
> > > libbpf: relocation: find map 0 (flip_table) for insn 17
> > > bpf: config program 'func=SyS_epoll_wait'
> > > symbol:SyS_epoll_wait file:(null) line:0 offset:0 return:0 lazy:(null)
> > > bpf: config 'func=SyS_epoll_wait' is ok
> > > Looking at the vmlinux_path (8 entries long)
> > > Using /lib/modules/4.15.0-rc6/build/vmlinux for symbols
> > > Open Debuginfo file: /lib/modules/4.15.0-rc6/build/vmlinux
> > > Try to find probe point from debuginfo.
> > > Matched function: SyS_epoll_wait [2f40eb7]
> > > found inline addr: 0xffffffff812b6ff1
> > > Probe point found: compat_SyS_epoll_pwait+129
> > > found inline addr: 0xffffffff812b6de7
> > > Probe point found: SyS_epoll_pwait+135
> > > found inline addr: 0xffffffff812b6c80
> > > Probe point found: SyS_epoll_wait+0
> > > Found 3 probe_trace_events.
> > > Opening /sys/kernel/debug/tracing//kprobe_events write=1
> > > Writing event: p:perf_bpf_probe/func _text+2846705
> > > Writing event: p:perf_bpf_probe/func_1 _text+2846183
> > > Writing event: p:perf_bpf_probe/func_2 _text+2845824
> > > libbpf: create map flip_table: fd=3
> > > add bpf event perf_bpf_probe:func and attach bpf program 4
> > > registering plugin: /root/.traceevent/plugins/plugin_kvm.so
> > > registering plugin: /root/.traceevent/plugins/plugin_hrtimer.so
> > > registering plugin: /root/.traceevent/plugins/plugin_jbd2.so
> > > registering plugin: /root/.traceevent/plugins/plugin_kmem.so
> > > registering plugin: /root/.traceevent/plugins/plugin_scsi.so
> > > registering plugin: /root/.traceevent/plugins/plugin_sched_switch.so
> > > registering plugin: /root/.traceevent/plugins/plugin_function.so
> > > registering plugin: /root/.traceevent/plugins/plugin_xen.so
> > > registering plugin: /root/.traceevent/plugins/plugin_mac80211.so
> > > registering plugin: /root/.traceevent/plugins/plugin_cfg80211.so
> > > adding perf_bpf_probe:func
> > > adding perf_bpf_probe:func to 0x24e3850
> > > add bpf event perf_bpf_probe:func_1 and attach bpf program 4
> > > adding perf_bpf_probe:func_1
> > > adding perf_bpf_probe:func_1 to 0x1965020
> > > add bpf event perf_bpf_probe:func_2 and attach bpf program 4
> > > adding perf_bpf_probe:func_2
> > > adding perf_bpf_probe:func_2 to 0x19656a0
> > > mmap size 1052672B
> > > BPF filter result incorrect, expected 56, got 0 samples
> > > Opening /sys/kernel/debug/tracing//kprobe_events write=1
> > > Opening /sys/kernel/debug/tracing//uprobe_events write=1
> > > Parsing probe_events: p:perf_bpf_probe/func _text+2846705
> > > Group:perf_bpf_probe Event:func probe:p
> > > Parsing probe_events: p:perf_bpf_probe/func_1 _text+2846183
> > > Group:perf_bpf_probe Event:func_1 probe:p
> > > Parsing probe_events: p:perf_bpf_probe/func_2 _text+2845824
> > > Group:perf_bpf_probe Event:func_2 probe:p
> > > Writing event: -:perf_bpf_probe/func
> > > Opening /sys/kernel/debug/tracing//kprobe_events write=1
> > > Opening /sys/kernel/debug/tracing//uprobe_events write=1
> > > Parsing probe_events: p:perf_bpf_probe/func_1 _text+2846183
> > > Group:perf_bpf_probe Event:func_1 probe:p
> > > Parsing probe_events: p:perf_bpf_probe/func_2 _text+2845824
> > > Group:perf_bpf_probe Event:func_2 probe:p
> > > Writing event: -:perf_bpf_probe/func_1
> > > Opening /sys/kernel/debug/tracing//kprobe_events write=1
> > > Opening /sys/kernel/debug/tracing//uprobe_events write=1
> > > Parsing probe_events: p:perf_bpf_probe/func_2 _text+2845824
> > > Group:perf_bpf_probe Event:func_2 probe:p
> > > Writing event: -:perf_bpf_probe/func_2
> > > test child finished with -1
> > > ---- end ----
> > > BPF filter subtest 0: FAILED!
> > > 39.2: BPF pinning :
> > > --- force skipped ---
> > > BPF filter subtest 1: Skip
> > > 39.3: BPF prologue generation :
> > > --- force skipped ---
> > > BPF filter subtest 2: Skip
> > > 39.4: BPF relocation checker :
> > > --- force skipped ---
> > > BPF filter subtest 3: Skip
> > > [root@jouet linux]#
> > > [root@jouet linux]#
> >
>

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