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Message-ID: <202601120124.RK3AWOwu-lkp@intel.com>
Date: Mon, 12 Jan 2026 02:03:31 +0800
From: kernel test robot <lkp@...el.com>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
Linux Memory Management List <linux-mm@...ck.org>,
linux-kernel@...r.kernel.org,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
Christoph Lameter <cl@...ux-foundation.org>,
Martin Liu <liumartin@...gle.com>,
David Rientjes <rientjes@...gle.com>, christian.koenig@....com,
Shakeel Butt <shakeel.butt@...ux.dev>,
SeongJae Park <sj@...nel.org>, Michal Hocko <mhocko@...e.com>,
Johannes Weiner <hannes@...xchg.org>,
Sweet Tea Dorminy <sweettea-kernel@...miny.me>,
Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
"Liam R . Howlett" <liam.howlett@...cle.com>,
Mike Rapoport <rppt@...nel.org>,
Suren Baghdasaryan <surenb@...gle.com>,
Vlastimil Babka <vbabka@...e.cz>,
Christian Brauner <brauner@...nel.org>,
Wei Yang <richard.weiyang@...il.com>,
David Hildenbrand <david@...hat.com>,
Miaohe Lin <linmiaohe@...wei.com>,
Al Viro <viro@...iv.linux.org.uk>,
linux-trace-kernel@...r.kernel.org, Yu Zhao <yuzhao@...gle.com>
Subject: Re: [PATCH v12 3/3] mm: Implement precise OOM killer task selection
Hi Mathieu,
kernel test robot noticed the following build warnings:
[auto build test WARNING on next-20260109]
[cannot apply to akpm-mm/mm-everything kees/for-next/execve tip/sched/core linus/master v6.19-rc4 v6.19-rc3 v6.19-rc2 v6.19-rc4]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Mathieu-Desnoyers/lib-Introduce-hierarchical-per-cpu-counters/20260111-231206
base: next-20260109
patch link: https://lore.kernel.org/r/20260111150249.1222944-4-mathieu.desnoyers%40efficios.com
patch subject: [PATCH v12 3/3] mm: Implement precise OOM killer task selection
config: arm-randconfig-001-20260112 (https://download.01.org/0day-ci/archive/20260112/202601120124.RK3AWOwu-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9b8addffa70cee5b2acc5454712d9cf78ce45710)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260112/202601120124.RK3AWOwu-lkp@intel.com/reproduce)
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 <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601120124.RK3AWOwu-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> kernel/fork.c:637:6: warning: format specifies type 'long' but the argument has type 'int' [-Wformat]
635 | pr_alert("BUG: Bad rss-counter state mm:%p type:%s val:%ld Comm:%s Pid:%d\n",
| ~~~
| %d
636 | mm, resident_page_types[i],
637 | percpu_counter_tree_precise_sum(&mm->rss_stat[i]),
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/printk.h:534:35: note: expanded from macro 'pr_alert'
534 | printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
| ~~~ ^~~~~~~~~~~
include/linux/printk.h:511:60: note: expanded from macro 'printk'
511 | #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
| ~~~ ^~~~~~~~~~~
include/linux/printk.h:483:19: note: expanded from macro 'printk_index_wrap'
483 | _p_func(_fmt, ##__VA_ARGS__); \
| ~~~~ ^~~~~~~~~~~
1 warning generated.
--
>> mm/oom_kill.c:351:6: warning: variable 'points_min' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
351 | if (oom_task_origin(task)) {
| ^~~~~~~~~~~~~~~~~~~~~
mm/oom_kill.c:392:22: note: uninitialized use occurs here
392 | oc->chosen_points = points_min;
| ^~~~~~~~~~
mm/oom_kill.c:351:2: note: remove the 'if' if its condition is always false
351 | if (oom_task_origin(task)) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
352 | points = LONG_MAX;
| ~~~~~~~~~~~~~~~~~~
353 | goto select;
| ~~~~~~~~~~~~
354 | }
| ~
mm/oom_kill.c:326:25: note: initialize the variable 'points_min' to silence this warning
326 | long points, points_min, points_max;
| ^
| = 0
1 warning generated.
vim +637 kernel/fork.c
6af8cb80d3a9a6 David Hildenbrand 2025-03-03 625
d70f2a14b72a4b Andrew Morton 2018-01-31 626 static void check_mm(struct mm_struct *mm)
d70f2a14b72a4b Andrew Morton 2018-01-31 627 {
d70f2a14b72a4b Andrew Morton 2018-01-31 628 int i;
d70f2a14b72a4b Andrew Morton 2018-01-31 629
8495f7e6732ed2 Sai Praneeth Prakhya 2019-09-25 630 BUILD_BUG_ON_MSG(ARRAY_SIZE(resident_page_types) != NR_MM_COUNTERS,
8495f7e6732ed2 Sai Praneeth Prakhya 2019-09-25 631 "Please make sure 'struct resident_page_types[]' is updated as well");
8495f7e6732ed2 Sai Praneeth Prakhya 2019-09-25 632
d70f2a14b72a4b Andrew Morton 2018-01-31 633 for (i = 0; i < NR_MM_COUNTERS; i++) {
25d942f31cc499 Mathieu Desnoyers 2026-01-11 634 if (unlikely(percpu_counter_tree_precise_compare_value(&mm->rss_stat[i], 0) != 0))
72456781289a6e Mathieu Desnoyers 2026-01-11 635 pr_alert("BUG: Bad rss-counter state mm:%p type:%s val:%ld Comm:%s Pid:%d\n",
25d942f31cc499 Mathieu Desnoyers 2026-01-11 636 mm, resident_page_types[i],
25d942f31cc499 Mathieu Desnoyers 2026-01-11 @637 percpu_counter_tree_precise_sum(&mm->rss_stat[i]),
881388f3433819 Xuanye Liu 2025-07-23 638 current->comm,
881388f3433819 Xuanye Liu 2025-07-23 639 task_pid_nr(current));
881388f3433819 Xuanye Liu 2025-07-23 640 }
d70f2a14b72a4b Andrew Morton 2018-01-31 641
d70f2a14b72a4b Andrew Morton 2018-01-31 642 if (mm_pgtables_bytes(mm))
d70f2a14b72a4b Andrew Morton 2018-01-31 643 pr_alert("BUG: non-zero pgtables_bytes on freeing mm: %ld\n",
d70f2a14b72a4b Andrew Morton 2018-01-31 644 mm_pgtables_bytes(mm));
d70f2a14b72a4b Andrew Morton 2018-01-31 645
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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