[linux-next:master] [vmscan] a7694ff11a: kernel-selftests.kvm.access_tracking_perf_test.fail

[linux-next:master] [vmscan] a7694ff11a: kernel-selftests.kvm.access_tracking_perf_test.fail

[kernel test robot]

Hello,

kernel test robot noticed "kernel-selftests.kvm.access_tracking_perf_test.fail" on:

commit: a7694ff11aa9d97d0f690351a964544849e5158d ("vmscan: don't bother with debugfs_real_fops()")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

[test failed on linux-next/master 0be23810e32e6d0a17df7c0ebad895ba2c210fc4]

in testcase: kernel-selftests
version: kernel-selftests-x86_64-7ff71e6d9239-1_20250215
with following parameters:

	group: kvm



config: x86_64-rhel-9.4-kselftests
compiler: gcc-12
test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G 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@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202507160818.49e37313-lkp@intel.com



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250716/202507160818.49e37313-lkp@intel.com


# timeout set to 120
# selftests: kvm: access_tracking_perf_test
# Random seed: 0x6b8b4567
# Skipping idle page count sanity check, because NUMA balancing is enabled
# Using lru_gen for aging
# Creating cgroup: /sys/fs/cgroup/access_tracking_perf_test
# Testing guest mode: PA-bits:ANY, VA-bits:48,  4K pages
# guest physical test memory: [0x3fffbffff000, 0x3ffffffff000)
#
# Populating memory             : 2.190023000s
# Initial aging pass (lru_gen)
# ==== Test Assertion Failure ====
#   lib/lru_gen_util.c:166: *end == '\0'
#   pid=13434 tid=13434 errno=0 - Success
#      1        0x0000000000408dd8: memcg_stats_handle_in_node at lru_gen_util.c:166
#      2        0x0000000000409034: lru_gen_read_memcg_stats at lru_gen_util.c:221
#      3        0x00000000004091e0: lru_gen_do_aging at lru_gen_util.c:309
#      4        0x0000000000403526: run_test at access_tracking_perf_test.c:436
#      5        0x0000000000403d8c: for_each_guest_mode at guest_modes.c:96
#      6        0x0000000000402bfd: run_test_for_each_guest_mode at access_tracking_perf_test.c:486
#      7        0x000000000041d993: cg_run at cgroup_util.c:382
#      8        0x0000000000402869: main at access_tracking_perf_test.c:591
#      9        0x00007fed7a779249: ?? ??:0
#     10        0x00007fed7a779304: ?? ??:0
#     11        0x0000000000402990: _start at ??:?
#   malformed generation age '0r'
not ok 76 selftests: kvm: access_tracking_perf_test # exit=254


-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [linux-next:master] [vmscan] a7694ff11a: kernel-selftests.kvm.access_tracking_perf_test.fail

[Al Viro]

On Wed, Jul 16, 2025 at 03:54:05PM +0800, kernel test robot wrote:
> 
> 
> Hello,
> 
> kernel test robot noticed "kernel-selftests.kvm.access_tracking_perf_test.fail" on:
> 
> commit: a7694ff11aa9d97d0f690351a964544849e5158d ("vmscan: don't bother with debugfs_real_fops()")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
> 
> [test failed on linux-next/master 0be23810e32e6d0a17df7c0ebad895ba2c210fc4]

Argh...  See https://lore.kernel.org/all/20250704040720.GP1880847@ZenIV/

Sorry, hadn't checked if the updated variant got picked ;-/