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

[Mi, Dapeng]

Thanks, this looks the same issue with
https://lore.kernel.org/oe-lkp/202607091054.7c96d6c6-lkp@xxxxxxxxx/.

To avoid the kernel address leakage, perf clears the kernel address to 0 if
only user space SAMPLE_IP is required.

The proper fix could need to refine the test case and filter out these 0 IP
addresses. The fix is in progress and would be posted later.


On 9/15/2026 3:45 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/torvalds/linux.git master
>
> [test failed on linux-next/master 68142f986ff04b2b70b31db00f719bf690f64a9a]
>
> in testcase: perf-sanity-tests
> with following parameters:
>
> 	perf_compiler: gcc
> 	group: group-00
>
> config: x86_64-rhel-9.4-bpf
> compiler: gcc-14
> test machine: 20 threads 1 sockets (Commet Lake) with 16G memory
>
> 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 <yi1.lai@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-lkp/202609151503.cb02f753-lkp@xxxxxxxxx
>
>
> 2026-09-14 10:03:47 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 ----
> ...
> Reading object code for memory address: 0x7f6d46bf44de File is: /usr/lib/x86_64-linux-gnu/libc.so.6
> Already tested /usr/lib/x86_64-linux-gnu/libc.so.6 @ 0xff4de - skipping Reading object code for memory address: 0x7f6d46bf44de File is: /usr/lib/x86_64-linux-gnu/libc.so.6
> Already tested /usr/lib/x86_64-linux-gnu/libc.so.6 @ 0xff4de - skipping Reading object code for memory address: 0 thread__find_map failed
> ---- end(-1) ----
>  23: Object code reading                                 : FAILED!
>
>
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20260915/202609151503.cb02f753-lkp@xxxxxxxxx
>
> This defect was originally reported on the perf/core branch (see https://lore.kernel.org/oe-lkp/202607091054.7c96d6c6-lkp@xxxxxxxxx/). Since the culprit patch has now been merged into the mainline kernel, we have re-submitted the report to ensure proper tracking.
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki