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On 12/24/25 04:58, kernel test robot wrote: > Hi Pavel, > > kernel test robot noticed the following build errors: > > [auto build test ERROR on tj-cgroup/for-next] > [also build test ERROR on linus/master v6.19-rc2 next-20251219] > [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/Pavel-Tikhomirov/cgroup-v2-freezer-allow-freezing-with-kthreads/20251223-182826 > base: https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-next > patch link: https://lore.kernel.org/r/20251223102124.738818-4-ptikhomirov%40virtuozzo.com > patch subject: [PATCH 2/2] cgroup-v2/freezer: Print information about unfreezable process > config: s390-randconfig-r071-20251224 (https://download.01.org/0day-ci/archive/20251224/202512240409.06R0khaZ-lkp@intel.com/config) > compiler: s390-linux-gcc (GCC) 8.5.0 > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251224/202512240409.06R0khaZ-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 > | Closes: https://lore.kernel.org/oe-kbuild-all/202512240409.06R0khaZ-lkp@intel.com/ > > All errors (new ones prefixed by >>): > > kernel/cgroup/freezer.c: In function 'warn_freeze_timeout_task': >>> kernel/cgroup/freezer.c:374:7: error: implicit declaration of function 'try_get_task_stack'; did you mean 'tryget_task_struct'? [-Werror=implicit-function-declaration] > if (!try_get_task_stack(task)) > ^~~~~~~~~~~~~~~~~~ > tryget_task_struct >>> kernel/cgroup/freezer.c:377:2: error: implicit declaration of function 'put_task_stack'; did you mean 'put_task_struct'? [-Werror=implicit-function-declaration] > put_task_stack(task); > ^~~~~~~~~~~~~~ > put_task_struct > cc1: some warnings being treated as errors > > Kconfig warnings: (for reference only) > WARNING: unmet direct dependencies detected for CAN_DEV > Depends on [n]: NETDEVICES [=n] && CAN [=y] > Selected by [y]: > - CAN [=y] && NET [=y] > > > vim +374 kernel/cgroup/freezer.c > > 357 > 358 static void warn_freeze_timeout_task(struct cgroup *cgrp, int timeout, > 359 struct task_struct *task) > 360 { > 361 char *buf __free(kfree) = NULL; > 362 pid_t tgid; > 363 > 364 buf = kmalloc(PATH_MAX, GFP_KERNEL); > 365 if (!buf) > 366 return; > 367 > 368 if (cgroup_path(cgrp, buf, PATH_MAX) < 0) > 369 return; > 370 > 371 tgid = task_pid_nr_ns(task, &init_pid_ns); > 372 pr_warn("Freeze of %s took %ld sec, due to unfreezable process %d:%s.\n", > 373 buf, timeout / USEC_PER_SEC, tgid, task->comm); > > 374 if (!try_get_task_stack(task)) > 375 return; > 376 show_stack(task, NULL, KERN_WARNING); > > 377 put_task_stack(task); > 378 } > 379 > -- Best regards, Pavel Tikhomirov Senior Software Developer, Virtuozzo.