Re: [perf] perf test BPF fails on 4.9.20

From: Pintu Kumar
Date: Fri Feb 02 2018 - 02:55:18 EST

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Hi,

perf test bpf prologue generation is failing.
37.2: Test BPF prologue generation : FAILED!

Try to find probe point from debuginfo.
Matched function: null_lseek [105be32]
Probe point found: null_lseek+0
Searching 'file' variable in context.
Converting variable file into trace event.
converting f_mode in file
file(type:file) has no member f_mode.
An error occurred in debuginfo analysis (-22).
bpf_probe: failed to convert perf probe eventsFailed to add events
selected by BPF
test child finished with -1
---- end ----
Test BPF filter subtest 1: FAILED!

Is there any fix available for this issue?
I searched 4.15, but could not relate any of the patches to this.

Thanks,
Pintu

On Thu, Feb 1, 2018 at 7:34 PM, Pintu Kumar <pintu.ping@xxxxxxxxx> wrote:
> Hi,
>
> After enabling DEBUG_INFO in kernel I still get this error for BPF test.
> Please help.
>
> # perf test BPF -v
> .....
> Looking at the vmlinux_path (8 entries long)
> Using /usr/lib/debug/boot/vmlinux-4.9.00-xxxx-amd-x86-64-00071-gd94c220-dirty
> for symbols
> Open Debuginfo file:
> /usr/lib/debug/boot/vmlinux-4.9.00-xxxx-amd-x86-64-00071-gd94c220-dirty
> Try to find probe point from debuginfo.
> Matched function: null_lseek [105be32]
> Probe point found: null_lseek+0
> Searching 'file' variable in context.
> Converting variable file into trace event.
> converting f_mode in file
> file(type:file) has no member f_mode.
> An error occurred in debuginfo analysis (-22).
> bpf_probe: failed to convert perf probe eventsFailed to add events
> selected by BPF
> test child finished with -1
> ---- end ----
> Test BPF filter subtest 1: FAILED!
>
>
>
> On Thu, Feb 1, 2018 at 10:50 AM, Pintu Kumar <pintu.ping@xxxxxxxxx> wrote:
>> Dear Masami,
>>
>> Now I am stuck again with 'perf test' failure on 4.9
>>
>> # perf --version
>> perf version 4.9.20-<product name>
>>
>> # perf test
>> 16: Try 'import perf' in python, checking link problems : FAILED!
>> 37.2: Test BPF prologue generation : FAILED!
>>
>> If you have any clue about these failure please hep me.
>>
>> Here are the verbose output:
>> -----------------------------------------------------------------------------
>> 1) # perf test python -v
>> 16: Try 'import perf' in python, checking link problems :
>> --- start ---
>> test child forked, pid 24562
>> Traceback (most recent call last):
>> File "<stdin>", line 1, in <module>
>> ImportError: No module named perf
>> test child finished with -1
>> ---- end ----
>> Try 'import perf' in python, checking link problems: FAILED!
>> ------------------------------------------------------------------------------
>>
>> 2) # perf test BPF -v
>> -------------------------------------------------------------------------------
>> .....
>> bpf: config 'func=null_lseek file->f_mode offset orig' is ok
>> Looking at the vmlinux_path (8 entries long)
>> symsrc__init: cannot get elf header.
>> Failed to find the path for kernel: Invalid ELF file
>> bpf_probe: failed to convert perf probe eventsFailed to add events
>> selected by BPF
>> test child finished with -1
>> ---- end ----
>> Test BPF filter subtest 1: FAILED!
>>
>> -------------------------------------------------------------------------------
>>
>>
>> Thanks,
>> Pintu
>>
>>
>> On Wed, Jan 31, 2018 at 9:01 AM, Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:
>>> On Tue, 30 Jan 2018 19:20:36 +0530
>>> Pintu Kumar <pintu.ping@xxxxxxxxx> wrote:
>>>
>>>> On Tue, Jan 30, 2018 at 11:13 AM, Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:
>>>> >
>>>> > On Mon, 29 Jan 2018 22:00:52 +0530
>>>> > Pintu Kumar <pintu.ping@xxxxxxxxx> wrote:
>>>> >
>>>> > > Dear Masami,
>>>> > >
>>>> > > Thank you so much for your reply.
>>>> > > Please find some of my answers inline.
>>>> > >
>>>> > >
>>>> > > On Mon, Jan 29, 2018 at 7:47 PM, Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:
>>>> > > > On Mon, 29 Jan 2018 13:40:34 +0530
>>>> > > > Pintu Kumar <pintu.ping@xxxxxxxxx> wrote:
>>>> > > >
>>>> > > >> Hi All,
>>>> > > >>
>>>> > > >> 'perf probe' is failing sometimes on 4.9.20 with AMD-64.
>>>> > > >> # perf probe --add schedule
>>>> > > >> schedule is out of .text, skip it.
>>>> > > >> Error: Failed to add events.
>>>> > > >>
>>>> > > >> If any one have come across this problem please let me know the cause.
>>>> > > >
>>>> > > > Hi Pintu,
>>>> > > >
>>>> > > > Could you run it with --vv?
>>>> > > >
>>>> > > Ok, I will send verbose output by tomorrow.
>>>> > >
>>>> > > >>
>>>> > > >> Note: I don't have CONFIG_DEBUG_INFO enabled in kernel. Is this the problem?
>>>> > > >
>>>> > > > Without it, you can not probe source-level probe nor trace local variable.
>>>> > > >
>>>> > >
>>>> > > Currently I am facing problem in enabling DEBUG_INFO in our kernel 4.9.20
>>>> > > However, I will try to manually include "-g" option during compilation.
>>>> > >
>>>> > > >> However, I manually copied the vmlinux file to /boot/ directory, but
>>>> > > >> still it does not work.
>>>> > > >
>>>> > > > That doesn't work.
>>>> > > > CONFIG_DEBUG_INFO option enables gcc to compile kernel with extra debuginfo.
>>>> > > > Without that option, debuginfo is not generated with vmlinux.
>>>> > > >
>>>> > > >>
>>>> > > >> I checked upstream patches until 4.15 but could not find any clue.
>>>> > > >> Please let me know if there is any fixes available for this.
>>>> > > >
>>>> > > > Could you also ensure that you run perf by root user?
>>>> > > >
>>>> > >
>>>> > > Yes I am running with root user.
>>>> > >
>>>> > > My concern is sometimes it works but sometimes it fails.
>>>> >
>>>> > What I thought was that your kernel enables kptr_strict(but maybe not.)
>>>> > Can you also try to find "schedule" and "_etext" functions in
>>>> > /proc/kallsyms?
>>>> >
>>>>
>>>> Yes these functions are present in kallsyms.
>>>>
>>>> # cat /proc/kallsyms | grep -w schedule ; cat /proc/kallsyms | grep -w _etext
>>>> ffffffff829328e0 T schedule
>>>> ffffffff8293e751 T _etext
>>>>
>>>>
>>>> > > I still needs to figure out, in which condition it works and which
>>>> > > condition it fails.
>>>> >
>>>> > Yeah, it is important.
>>>> >
>>>> > > Usually I noticed that in fresh reboot case it works.
>>>> >
>>>> > So, after a while, it doesn't work again? If so, it sounds like a daemon
>>>> > process changes settings in background.
>>>> >
>>>>
>>>> Fortunately or unfortunately, now it is passing every time.
>>>> Still not sure about the cause.
>>>> If it fails again, I will collect info with -v and report again.
>>>> Any specific info that I need to check when it fails ?
>>>
>>> OK, if you hit it again, please run perf-probe with -vvv option
>>> (-v is enough usually, if it is unknown bug, -vvv will be better)
>>>
>>> Thank you,
>>>
>>>
>>>>
>>>> Thank You,
>>>> Pintu
>>>>
>>>>
>>>> > Thank you,
>>>> >
>>>> > >
>>>> > >
>>>> > > > Thank you,
>>>> > > >
>>>> > > >
>>>> > > >>
>>>> > > >>
>>>> > > >> Thank You!
>>>> > > >> Regards,
>>>> > > >> Pintu
>>>> > > >>
>>>> > > >>
>>>> > > >> On Thu, Jan 25, 2018 at 7:09 PM, Pintu Kumar <pintu.ping@xxxxxxxxx> wrote:
>>>> > > >> > Hi,
>>>> > > >> >
>>>> > > >> > ** Changed the subject now, since these issues are related to general
>>>> > > >> > perf commands.
>>>> > > >> >
>>>> > > >> > Following are the issues:
>>>> > > >> >
>>>> > > >> > 1) perf probe --add schedule - FAILED
>>>> > > >> > output:
>>>> > > >> > schedule is out of .text, skip it.
>>>> > > >> > Error: Failed to add events.
>>>> > > >> >
>>>> > > >> > what is the issue here?
>>>> > > >> > Sometimes it pass and sometimes it fails...
>>>> > > >> > Similar is the case of 'perf inject' as well.
>>>> > > >> >
>>>> > > >> > 2) perf test - 1 FAILURE
>>>> > > >> > 37.1: Test basic BPF filtering : FAILED!
>>>> > > >> > 37.2: Test BPF prologue generation : Skip
>>>> > > >> > 37.3: Test BPF relocation checker : Skip
>>>> > > >> >
>>>> > > >> > 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 /boot/vmlinux for symbols
>>>> > > >> > Could not open debuginfo. Try to use symbols.
>>>> > > >> > SyS_epoll_wait is out of .text, skip it.
>>>> > > >> > bpf_probe: failed to convert perf probe eventsFailed to add events
>>>> > > >> > selected by BPF
>>>> > > >> > test child finished with -1
>>>> > > >> > ---- end ----
>>>> > > >> > Test BPF filter subtest 0: FAILED!
>>>> > > >> >
>>>> > > >> > Looks like both 1,2 are related.
>>>> > > >> > Since, CONFIG_DEBUG_INFO is not enabled, I manually copied the vmlinux
>>>> > > >> > to /boot/ folder.
>>>> > > >> >
>>>> > > >> > -------
>>>> > > >> > Some more info:
>>>> > > >> >
>>>> > > >> > Kernel build dir is set to /lib/modules/4.9.20-sc-amd-x86-64/build
>>>> > > >> > set env: KBUILD_DIR=/lib/modules/4.9.20-sc-amd-x86-64/build
>>>> > > >> > unset env: KBUILD_OPTS
>>>> > > >> > include option is set to -nostdinc -isystem
>>>> > > >> > /usr/lib/gcc/x86_64-linux-gnu/5/include -I./arch/x86/include
>>>> > > >> > -I./arch/x86/include/generated/uapi -I./arch/x86/include/generated
>>>> > > >> > -I./include -I./arch/x86/include/uapi -I./include/uapi
>>>> > > >> > -I./include/generated/uapi -include ./include/linux/kconfig.h
>>>> > > >> > set env: NR_CPUS=8
>>>> > > >> > set env: LINUX_VERSION_CODE=0x40914
>>>> > > >> > set env: CLANG_EXEC=/usr/bin/clang
>>>> > > >> > set env: CLANG_OPTIONS=-xc
>>>> > > >> > set env: KERNEL_INC_OPTIONS= -nostdinc -isystem
>>>> > > >> > /usr/lib/gcc/x86_64-linux-gnu/5/include -I./arch/x86/include
>>>> > > >> > -I./arch/x86/include/generated/uapi -I./arch/x86/include/generated
>>>> > > >> > -I./include -I./arch/x86/include/uapi -I./include/uapi
>>>> > > >> > -I./include/generated/uapi -include ./include/linux/kconfig.h
>>>> > > >> > set env: WORKING_DIR=/lib/modules/4.9.20-sc-amd-x86-64/build
>>>> > > >> >
>>>> > > >> >
>>>> > > >> > If you have any clue about these failure please help me.
>>>> > > >> >
>>>> > > >> >
>>>> > > >> > Thanks,
>>>> > > >> > Pintu
>>>> > > >> >
>>>> > > >> >
>>>> > > >> > On Wed, Jan 24, 2018 at 8:23 PM, Pintu Kumar <pintu.ping@xxxxxxxxx> wrote:
>>>> > > >> >> Hi,
>>>> > > >> >>
>>>> > > >> >> Thanks for your help.
>>>> > > >> >> Yes it was a sub version issue.
>>>> > > >> >>
>>>> > > >> >> Earlier, while building the kernel I left the SUBLEVEL as blank.
>>>> > > >> >>
>>>> > > >> >> make -j8 bindeb-pkg SUBLEVEL=20
>>>> > > >> >>
>>>> > > >> >> After passing the correct sublevel now the test is working.
>>>> > > >> >>
>>>> > > >> >> But still following are failing:
>>>> > > >> >>
>>>> > > >> >> 16: Try 'import perf' in python, checking link problems : FAILED!
>>>> > > >> >> 37.2: Test BPF prologue generation : FAILED!
>>>> > > >> >>
>>>> > > >> >>
>>>> > > >> >> This is the error I get:
>>>> > > >> >>
>>>> > > >> >> 16: Try 'import perf' in python, checking link problems :
>>>> > > >> >> --- start ---
>>>> > > >> >> test child forked, pid 7637
>>>> > > >> >> Traceback (most recent call last):
>>>> > > >> >> File "<stdin>", line 1, in <module>
>>>> > > >> >> ImportError: No module named perf
>>>> > > >> >> test child finished with -1
>>>> > > >> >> ---- end ----
>>>> > > >> >> Try 'import perf' in python, checking link problems: FAILED!
>>>> > > >> >>
>>>> > > >> >>
>>>> > > >> >> Looking at the vmlinux_path (8 entries long)
>>>> > > >> >> symsrc__init: cannot get elf header.
>>>> > > >> >> Failed to find the path for kernel: Invalid ELF file
>>>> > > >> >> bpf_probe: failed to convert perf probe eventsFailed to add events
>>>> > > >> >> selected by BPF
>>>> > > >> >> test child finished with -1
>>>> > > >> >> ---- end ----
>>>> > > >> >> Test BPF filter subtest 1: FAILED!
>>>> > > >> >>
>>>> > > >> >>
>>>> > > >> >>
>>>> > > >> >> Thanks,
>>>> > > >> >> Pintu
>>>> > > >> >>
>>>> > > >> >>
>>>> > > >> >> On Wed, Jan 24, 2018 at 6:39 AM, Wangnan (F) <wangnan0@xxxxxxxxxx> wrote:
>>>> > > >> >>>
>>>> > > >> >>>
>>>> > > >> >>> On 2018/1/23 20:37, Pintu Kumar wrote:
>>>> > > >> >>>>
>>>> > > >> >>>> Hi All,
>>>> > > >> >>>>
>>>> > > >> >>>> I am verifying all perf tests on Ubuntu-16 x86-64 platform using the
>>>> > > >> >>>> kernel version 4.9.20.
>>>> > > >> >>>> I have installed several others packages including: clang, llvm
>>>> > > >> >>>>
>>>> > > >> >>>> But, when I run 'perf test' I get some FAILURE.
>>>> > > >> >>>> Specially, 'perf test LLVM' is failing.
>>>> > > >> >>>>
>>>> > > >> >>>> Please check the below error logs:
>>>> > > >> >>>>
>>>> > > >> >>>> ----------------------------------------------------
>>>> > > >> >>>> # perf test LLVM
>>>> > > >> >>>> 35: Test LLVM searching and compiling :
>>>> > > >> >>>> 35.1: Basic BPF llvm compiling test : FAILED!
>>>> > > >> >>>> 35.2: Test kbuild searching : Skip
>>>> > > >> >>>> 35.3: Compile source for BPF prologue generation test : Skip
>>>> > > >> >>>> 35.4: Compile source for BPF relocation test : Skip
>>>> > > >> >>>> ----------------------------------------------------
>>>> > > >> >>>>
>>>> > > >> >>>> When I run with -v I get this:
>>>> > > >> >>>>
>>>> > > >> >>>> -----------------------------------------------------
>>>> > > >> >>>> # perf test -v LLVM
>>>> > > >> >>>> 35: Test LLVM searching and compiling :
>>>> > > >> >>>> 35.1: Basic BPF llvm compiling test :
>>>> > > >> >>>> --- start ---
>>>> > > >> >>>> test child forked, pid 3304
>>>> > > >> >>>> Unablt to get kernel version from uname '4.9-xxxx-amd-x86-64'
>>>> > > >> >>>> WARNING: unable to get correct kernel building directory.
>>>> > > >> >>>> Hint: Set correct kbuild directory using 'kbuild-dir' option in [llvm]
>>>> > > >> >>>> section of ~/.perfconfig or set it to "" to suppress kbuild
>>>> > > >> >>>> detection.
>>>> > > >> >>>>
>>>> > > >> >>>> Unablt to get kernel version from uname '4.9-xxxx-amd-x86-64'
>>>> > > >> >>>>
>>>> > > >> >>>>
>>>> > > >> >>>> 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: 2129190-4a0 doesn't provide kernel version
>>>> > > >> >>>> Failed to parse test case 'Basic BPF llvm compiling test'
>>>> > > >> >>>> test child finished with -1
>>>> > > >> >>>> ---- end ----
>>>> > > >> >>>> Test LLVM searching and compiling subtest 0: FAILED!
>>>> > > >> >>>> -----------------------------------------------------
>>>> > > >> >>>>
>>>> > > >> >>>>
>>>> > > >> >>>> Basic BPF LLVM compiling test is failing.
>>>> > > >> >>>> It reports that bpf could not able to read the kernel version from uname.
>>>> > > >> >>>> Is it because of this that 'perf test LLVM' is failing ?
>>>> > > >> >>>>
>>>> > > >> >>>> My uname says:
>>>> > > >> >>>> 4.9-xxxx-amd-x86-64
>>>> > > >> >>>
>>>> > > >> >>>
>>>> > > >> >>> 'perf test LLVM' requires a well formed uname string (%d.%d.%d). Please see
>>>> > > >> >>> tools/perf/fetch_kernel_version . If your distro uses another method to
>>>> > > >> >>> report
>>>> > > >> >>> kernel version number (from your uname string, sublevel can't be
>>>> > > >> >>> determined),
>>>> > > >> >>> please help us improve that function like what we have done for ubuntu
>>>> > > >> >>> (checking /proc/version_signature).
>>>> > > >> >>>
>>>> > > >> >>>
>>>> > > >> >>>
>>>> > > >> >>>> My kernel version is: 4.9.20 (from Makefile)
>>>> > > >> >>>>
>>>> > > >> >>>> So, I dont think there is any problem with kernel version.
>>>> > > >> >>>>
>>>> > > >> >>>> If any body have come across this problem please let me know how to
>>>> > > >> >>>> resolve this issue.
>>>> > > >> >>>>
>>>> > > >> >>>>
>>>> > > >> >>>>
>>>> > > >> >>>> Thank You!
>>>> > > >> >>>>
>>>> > > >> >>>> Regards,
>>>> > > >> >>>> Pintu
>>>> > > >> >>>
>>>> > > >> >>>
>>>> > > >> >>>
>>>> > > >
>>>> > > >
>>>> > > > --
>>>> > > > Masami Hiramatsu <mhiramat@xxxxxxxxxx>
>>>> >
>>>> >
>>>> > --
>>>> > Masami Hiramatsu <mhiramat@xxxxxxxxxx>
>>>
>>>
>>> --
>>> Masami Hiramatsu <mhiramat@xxxxxxxxxx>

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