Re: [PATCH v2 2/3] lib/raid6: Optimizing the raid6_select_algo time through asynchronous processing

From: kernel test robot

Date: Thu Feb 12 2026 - 21:35:04 EST

Hello,

kernel test robot noticed "Oops:int3:#[##]SMP_KASAN_NOPTI" on:

commit: 9931f8d4a042e5e2cbf74d9ee99ece44da404284 ("[PATCH v2 2/3] lib/raid6: Optimizing the raid6_select_algo time through asynchronous processing")
url: https://github.com/intel-lab-lkp/linux/commits/sunliming-linux-dev/lib-raid6-Divide-the-raid6-algorithm-selection-process-into-two-parts/20260206-134850
base: https://git.kernel.org/cgit/linux/kernel/git/akpm/mm.git mm-nonmm-unstable
patch link: https://lore.kernel.org/all/20260206054341.106878-3-sunliming@xxxxxxxxx/
patch subject: [PATCH v2 2/3] lib/raid6: Optimizing the raid6_select_algo time through asynchronous processing

in testcase: perf-sanity-tests
version:
with following parameters:

perf_compiler: gcc
group: group-00

config: x86_64-rhel-9.4-bpf
compiler: gcc-14
test machine: 16 threads 1 sockets Intel(R) Xeon(R) E-2278G CPU @ 3.40GHz (Coffee Lake-E) with 32G 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/202602131016.5ce5a38e-lkp@xxxxxxxxx

[ 81.049609][ C15] Oops: int3: 0000 [#1] SMP KASAN NOPTI
[ 81.049615][ C15] CPU: 15 UID: 0 PID: 109 Comm: kworker/15:0 Tainted: G S 6.19.0-rc6-00175-g9931f8d4a042 #1 PREEMPT(full)
[ 81.049621][ C15] Tainted: [S]=CPU_OUT_OF_SPEC
[ 81.049622][ C15] Hardware name: Intel Corporation Mehlow UP Server Platform/Moss Beach Server, BIOS CNLSE2R1.R00.X188.B13.1903250419 03/25/2019
[ 81.049625][ C15] Workqueue: events benchmark_work_func [raid6_pq]
[ 81.049631][ C15] RIP: 0010:benchmark_work_func (kbuild/src/consumer/lib/raid6/recov.c:65) raid6_pq
[ 81.049650][ C15] Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <cc> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc
All code
========
0: cc int3
1: cc int3
2: cc int3
3: cc int3
4: cc int3
5: cc int3
6: cc int3
7: cc int3
8: cc int3
9: cc int3
a: cc int3
b: cc int3
c: cc int3
d: cc int3
e: cc int3
f: cc int3
10: cc int3
11: cc int3
12: cc int3
13: cc int3
14: cc int3
15: cc int3
16: cc int3
17: cc int3
18: cc int3
19: cc int3
1a: cc int3
1b: cc int3
1c: cc int3
1d: cc int3
1e: cc int3
1f: cc int3
20: cc int3
21: cc int3
22: cc int3
23: cc int3
24: cc int3
25: cc int3
26: cc int3
27: cc int3
28: cc int3
29: cc int3
2a:* cc int3 <-- trapping instruction
2b: cc int3
2c: cc int3
2d: cc int3
2e: cc int3
2f: cc int3
30: cc int3
31: cc int3
32: cc int3
33: cc int3
34: cc int3
35: cc int3
36: cc int3
37: cc int3
38: cc int3
39: cc int3
3a: cc int3
3b: cc int3
3c: cc int3
3d: cc int3
3e: cc int3
3f: cc int3

Code starting with the faulting instruction
===========================================
0: cc int3
1: cc int3
2: cc int3
3: cc int3
4: cc int3
5: cc int3
6: cc int3
7: cc int3
8: cc int3
9: cc int3
a: cc int3
b: cc int3
c: cc int3
d: cc int3
e: cc int3
f: cc int3
10: cc int3
11: cc int3
12: cc int3
13: cc int3
14: cc int3
15: cc int3
[ 81.049653][ C15] RSP: 0018:ffff888101557b58 EFLAGS: 00000286
[ 81.049656][ C15] RAX: ffffffffc115b5a0 RBX: 1ffff110202aaf6b RCX: 0000000000000000
[ 81.049658][ C15] RDX: ffffffffc115b6e0 RSI: ffffffff81513d9c RDI: ffffed10202aaf56
[ 81.049660][ C15] RBP: ffff88886bdf0000 R08: 0000000000000000 R09: fffffbfff0b21e14
[ 81.049662][ C15] R10: ffffffff8590f0a7 R11: 0000000000000001 R12: ffff888101557bb8
[ 81.049664][ C15] R13: ffff88886bdf8000 R14: ffff888101557bb8 R15: ffff8887887c33c0
[ 81.049667][ C15] FS: 0000000000000000(0000) GS:ffff888801e6a000(0000) knlGS:0000000000000000
[ 81.049669][ C15] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 81.049671][ C15] CR2: 00007f33621da000 CR3: 00000002f20ed006 CR4: 00000000003726f0
[ 81.049674][ C15] Call Trace:
[ 81.049676][ C15] <TASK>
[ 81.049680][ C15] ? rcu_is_watching (kbuild/src/consumer/arch/x86/include/asm/atomic.h:23 kbuild/src/consumer/include/linux/atomic/atomic-arch-fallback.h:457 kbuild/src/consumer/include/linux/context_tracking.h:128 kbuild/src/consumer/kernel/rcu/tree.c:751)
[ 81.049685][ C15] ? rcu_is_watching (kbuild/src/consumer/arch/x86/include/asm/atomic.h:23 kbuild/src/consumer/include/linux/atomic/atomic-arch-fallback.h:457 kbuild/src/consumer/include/linux/context_tracking.h:128 kbuild/src/consumer/kernel/rcu/tree.c:751)
[ 81.049689][ C15] ? lock_acquire (kbuild/src/consumer/include/trace/events/lock.h:24 (discriminator 2) kbuild/src/consumer/kernel/locking/lockdep.c:5831 (discriminator 2))
[ 81.049694][ C15] ? process_one_work (kbuild/src/consumer/arch/x86/include/asm/jump_label.h:37 kbuild/src/consumer/include/trace/events/workqueue.h:110 kbuild/src/consumer/kernel/workqueue.c:3262)

The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260213/202602131016.5ce5a38e-lkp@xxxxxxxxx

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