Re: [tip:perf/core] [perf/core] 166f10836a: perf-sanity-tests.Object_code_reading.fail

[Mi, Dapeng]

Hi Oliver,

It looks the direct reason causing the test case failure is the "0" sampled
IP. This is expected. The commit 166f10836a653dfa280d4335603b52f685b8b1ef
("perf/core: Fix kernel register info leak via hardware skid") mitigates a
security hole and may lead to the sampled IP could be 0. 

What user right is used to run this command, root or normal user? If it's a
root user, suppose it should not generate such kind of error. Could you
please add "-vvv" option and rerun this test? The "-vvv" option would print
more  verbose log.

Thanks!

-Dapeng


On 7/9/2026 12:36 PM, kernel test robot wrote:
>
> Hello,
>
> kernel test robot noticed "perf-sanity-tests.Object_code_reading.fail" on:
>
> commit: 166f10836a653dfa280d4335603b52f685b8b1ef ("perf/core: Fix kernel register info leak via hardware skid")
> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git perf/core
>
>
> in testcase: perf-sanity-tests
> version: 
> with following parameters:
>
> 	perf_compiler: clang
> 	group: group-00
>
>
>
> config: x86_64-rhel-9.4-bpf
> compiler: gcc-14
> test machine: 224 threads 4 sockets Intel(R) Xeon(R) Platinum 8380H CPU @ 2.90GHz (Cooper Lake) with 192G memory
>
> (please refer to attached dmesg/kmsg for entire log/backtrace)
>
>
>
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-lkp/202607091054.7c96d6c6-lkp@xxxxxxxxx
>
>
> 2026-07-07 00:10:32 sudo ASAN_OPTIONS=fast_unwind_on_malloc=0 /usr/src/linux-perf-x86_64-rhel-9.4-bpf-166f10836a653dfa280d4335603b52f685b8b1ef/tools/perf/perf test 23 -v
>  23: Object code reading                                 : Running (1 active)
> ---- start ----
> ...
> Bytes read match those read by objdump
> Reading object code for memory address: 0x7feb8f2134fa
> File is: /usr/lib/x86_64-linux-gnu/libgcc_s.so.1
> On file address is: 0x204fa
> Objdump command is: objdump -z -d --start-address=0x204fa --stop-address=0x2057a /usr/lib/x86_64-linux-gnu/libgcc_s.so.1
> Bytes read match those read by objdump
> Reading object code for memory address: 0
> thread__find_map failed
> ---- end(-1) ----
>  23: Object code reading                                 : FAILED!
>
> === Test Summary ===
> Passed main tests : 0
> Passed subtests   : 0
> Skipped tests     : 0
> Failed tests      : 1
> List of failed tests:
>    23: Object code reading
>
>
>
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20260709/202607091054.7c96d6c6-lkp@xxxxxxxxx
>
>
>