Re: [PATCH net RESEND] net/core : fix KMSAN: uninit value in tipc_rcv

kernel test robot
2025-09-24T08:37:24Z

Hello,

kernel test robot noticed a 33.9% regression of netperf.Throughput_Mbps on:

commit: 5cde54f8220b582bda9c34ef86e04ec00be4ce4a ("[PATCH net RESEND] net/core : fix KMSAN: uninit value in tipc_rcv")
url: https://github.com/intel-lab-lkp/linux/commits/hariconscious-gmail-com/net-core-fix-KMSAN-uninit-value-in-tipc_rcv/20250920-023232
base: https://git.kernel.org/cgit/linux/kernel/git/davem/net.git cbf658dd09419f1ef9de11b9604e950bdd5c170b
patch link: https://lore.kernel.org/all/20250919183146.4933-1-hariconscious@gmail.com/
patch subject: [PATCH net RESEND] net/core : fix KMSAN: uninit value in tipc_rcv

testcase: netperf
config: x86_64-rhel-9.4
compiler: gcc-14
test machine: 192 threads 2 sockets Intel(R) Xeon(R) 6740E CPU @ 2.4GHz (Sierra Forest) with 256G memory
parameters:

ip: ipv4
runtime: 300s
nr_threads: 100%
cluster: cs-localhost
test: SCTP_STREAM
cpufreq_governor: performance

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/202509241629.3d135124-lkp@intel.com

Details are as below:
-------------------------------------------------------------------------------------------------->

The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250924/202509241629.3d135124-lkp@intel.com

=========================================================================================
cluster/compiler/cpufreq_governor/ip/kconfig/nr_threads/rootfs/runtime/tbox_group/test/testcase:
cs-localhost/gcc-14/performance/ipv4/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/300s/lkp-srf-2sp3/SCTP_STREAM/netperf

commit:
cbf658dd09 ("Merge tag 'net-6.17-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net")
5cde54f822 ("net/core : fix KMSAN: uninit value in tipc_rcv")

cbf658dd09419f1e 5cde54f8220b582bda9c34ef86e
---------------- ---------------------------
%stddev %change %stddev
\ | \
5.164e+09 -14.4% 4.419e+09 cpuidle..time
1504152 -12.9% 1310310 ± 4% cpuidle..usage
125501 ± 2% +19.6% 150094 ± 3% meminfo.Mapped
401239 ± 4% +18.3% 474475 meminfo.Shmem
8.63 -1.3 7.31 ± 2% mpstat.cpu.all.idle%
0.42 +0.1 0.52 mpstat.cpu.all.irq%
1.96e+08 -34.2% 1.29e+08 numa-numastat.node0.local_node
1.961e+08 -34.2% 1.291e+08 numa-numastat.node0.numa_hit
1.943e+08 -33.3% 1.297e+08 numa-numastat.node1.local_node
1.944e+08 -33.2% 1.298e+08 numa-numastat.node1.numa_hit
1.961e+08 -34.2% 1.291e+08 numa-vmstat.node0.numa_hit
1.96e+08 -34.2% 1.29e+08 numa-vmstat.node0.numa_local
1.944e+08 -33.2% 1.298e+08 numa-vmstat.node1.numa_hit
1.943e+08 -33.3% 1.297e+08 numa-vmstat.node1.numa_local
1386 -33.9% 916.08 netperf.ThroughputBoth_Mbps
266242 -33.9% 175886 netperf.ThroughputBoth_total_Mbps
1386 -33.9% 916.08 netperf.Throughput_Mbps
266242 -33.9% 175886 netperf.Throughput_total_Mbps
476071 -18.8% 386450 ± 2% netperf.time.involuntary_context_switches
6916 +26.0% 8715 netperf.time.percent_of_cpu_this_job_got
20872 +26.3% 26369 netperf.time.system_time
117319 -33.4% 78105 netperf.time.voluntary_context_switches
115788 -33.9% 76498 netperf.workload
1005775 +1.8% 1024121 proc-vmstat.nr_file_pages
31705 ± 2% +18.6% 37602 ± 4% proc-vmstat.nr_mapped
100398 ± 4% +18.3% 118736 proc-vmstat.nr_shmem
9211977 -4.0% 8843488 proc-vmstat.nr_slab_unreclaimable
3.905e+08 -33.7% 2.589e+08 proc-vmstat.numa_hit
226148 +11.7% 252687 proc-vmstat.numa_huge_pte_updates
3.903e+08 -33.7% 2.587e+08 proc-vmstat.numa_local
1.164e+08 +11.6% 1.299e+08 proc-vmstat.numa_pte_updates
1.243e+10 -33.8% 8.227e+09 proc-vmstat.pgalloc_normal
1.243e+10 -33.8% 8.226e+09 proc-vmstat.pgfree
4.20 ± 13% -50.0% 2.10 ± 11% perf-sched.sch_delay.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
4.20 ± 13% -50.0% 2.10 ± 11% perf-sched.total_sch_delay.average.ms
111.28 ± 3% +10.7% 123.18 ± 5% perf-sched.total_wait_and_delay.average.ms
32792 ± 4% -16.3% 27444 ± 6% perf-sched.total_wait_and_delay.count.ms
3631 ± 10% +24.8% 4531 ± 5% perf-sched.total_wait_and_delay.max.ms
107.08 ± 3% +13.1% 121.09 ± 5% perf-sched.total_wait_time.average.ms
3631 ± 10% +24.8% 4531 ± 5% perf-sched.total_wait_time.max.ms
111.28 ± 3% +10.7% 123.18 ± 5% perf-sched.wait_and_delay.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
32792 ± 4% -16.3% 27444 ± 6% perf-sched.wait_and_delay.count.[unknown].[unknown].[unknown].[unknown].[unknown]
3631 ± 10% +24.8% 4531 ± 5% perf-sched.wait_and_delay.max.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
107.08 ± 3% +13.1% 121.09 ± 5% perf-sched.wait_time.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
3631 ± 10% +24.8% 4531 ± 5% perf-sched.wait_time.max.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
201981 ± 5% +34.9% 272400 ± 13% sched_debug.cfs_rq:/.avg_vruntime.stddev
2.36 ± 6% -14.1% 2.03 ± 5% sched_debug.cfs_rq:/.h_nr_queued.max
0.40 ± 4% -23.5% 0.30 ± 4% sched_debug.cfs_rq:/.h_nr_queued.stddev
2.25 ± 3% -11.1% 2.00 ± 4% sched_debug.cfs_rq:/.h_nr_runnable.max
0.38 ± 5% -24.0% 0.29 ± 4% sched_debug.cfs_rq:/.h_nr_runnable.stddev
20700 ± 27% -42.3% 11950 ± 12% sched_debug.cfs_rq:/.load.avg
201981 ± 5% +34.9% 272400 ± 13% sched_debug.cfs_rq:/.min_vruntime.stddev
0.28 ± 7% -18.1% 0.23 ± 5% sched_debug.cfs_rq:/.nr_queued.stddev
350.87 ± 3% -12.8% 306.09 ± 4% sched_debug.cfs_rq:/.runnable_avg.stddev
335.58 ± 3% -20.3% 267.63 ± 5% sched_debug.cfs_rq:/.util_est.stddev
21.08 ± 8% +47.3% 31.05 ± 3% sched_debug.cpu.clock.stddev
2128 ± 7% -15.5% 1799 ± 6% sched_debug.cpu.curr->pid.stddev
0.43 ± 3% -27.4% 0.32 ± 5% sched_debug.cpu.nr_running.stddev
7223 ± 2% -11.7% 6379 ± 3% sched_debug.cpu.nr_switches.avg
4597 -17.4% 3798 ± 2% sched_debug.cpu.nr_switches.min
129.49 +86.1% 241.00 perf-stat.i.MPKI
8.424e+09 -42.4% 4.852e+09 perf-stat.i.branch-instructions
0.29 +0.2 0.45 perf-stat.i.branch-miss-rate%
17058270 -23.6% 13026512 ± 2% perf-stat.i.branch-misses
88.13 +2.9 91.01 perf-stat.i.cache-miss-rate%
3.228e+09 -6.3% 3.023e+09 perf-stat.i.cache-misses
3.654e+09 -9.3% 3.315e+09 perf-stat.i.cache-references
6871 ± 2% -16.7% 5721 ± 4% perf-stat.i.context-switches
22.00 +103.7% 44.81 perf-stat.i.cpi
5.596e+11 +1.8% 5.697e+11 perf-stat.i.cpu-cycles
1398 -20.9% 1105 perf-stat.i.cpu-migrations
188.57 +5.6% 199.20 perf-stat.i.cycles-between-cache-misses
3.807e+10 -40.8% 2.255e+10 perf-stat.i.instructions
0.08 -39.9% 0.05 perf-stat.i.ipc
0.07 ± 43% +152.2% 0.17 ± 19% perf-stat.i.major-faults
8762 ± 6% -11.8% 7728 ± 4% perf-stat.i.minor-faults
8762 ± 6% -11.8% 7728 ± 4% perf-stat.i.page-faults
103.32 +51.1% 156.15 perf-stat.overall.MPKI
0.24 +0.1 0.31 ± 2% perf-stat.overall.branch-miss-rate%
88.33 +2.9 91.19 perf-stat.overall.cache-miss-rate%
17.83 +64.8% 29.38 perf-stat.overall.cpi
172.58 +9.0% 188.12 perf-stat.overall.cycles-between-cache-misses
0.06 -39.3% 0.03 perf-stat.overall.ipc
83258790 -6.9% 77496361 perf-stat.overall.path-length
6.993e+09 -40.6% 4.156e+09 perf-stat.ps.branch-instructions
16501261 -22.8% 12743483 perf-stat.ps.branch-misses
3.25e+09 -7.0% 3.022e+09 perf-stat.ps.cache-misses
3.679e+09 -9.9% 3.314e+09 perf-stat.ps.cache-references
6755 -16.5% 5642 ± 3% perf-stat.ps.context-switches
5.608e+11 +1.4% 5.684e+11 perf-stat.ps.cpu-cycles
1399 -21.5% 1099 perf-stat.ps.cpu-migrations
3.145e+10 -38.5% 1.935e+10 perf-stat.ps.instructions
0.06 ± 34% +195.2% 0.16 ± 20% perf-stat.ps.major-faults
9.64e+12 -38.5% 5.928e+12 perf-stat.total.instructions

Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.

--
0-DAY CI Kernel Test Service