tree:   https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/dev
head:   636c9bc361b1f0acdb57c2b0deb131ea57896cc9
commit: f1c73cc03a10ba8300792eb9cbd0686614efd2b2 [39/42] rcu-tasks: Report stalls during synchronize_srcu() in rcu_tasks_postscan()
config: x86_64-randconfig-a013
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/f1c73cc03a10ba8300792eb9cbd0686614efd2b2
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block paulmck/linux-rcu/dev
        git checkout f1c73cc03a10ba8300792eb9cbd0686614efd2b2
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

Note: the ammarfaizi2-block/paulmck/linux-rcu/dev HEAD 636c9bc361b1f0acdb57c2b0deb131ea57896cc9 builds fine.
      It only hurts bisectability.

All errors (new ones prefixed by >>):

   In file included from include/linux/kernel.h:29,
                    from kernel/rcu/update.c:21:
   kernel/rcu/tasks.h: In function 'tasks_rcu_exit_srcu_stall':
>> kernel/rcu/tasks.h:944:17: error: implicit declaration of function 'tasks_gp_state_getname' [-Werror=implicit-function-declaration]
     944 |                 tasks_gp_state_getname(&rcu_tasks), jiffies - rcu_tasks.gp_jiffies);
         |                 ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/printk.h:429:33: note: in definition of macro 'printk_index_wrap'
     429 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                                 ^~~~~~~~~~~
   include/linux/printk.h:530:9: note: in expansion of macro 'printk'
     530 |         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~
   kernel/rcu/tasks.h:942:9: note: in expansion of macro 'pr_info'
     942 |         pr_info("%s: %s grace period number %lu (since boot) gp_state: %s is %lu jiffies old.\n",
         |         ^~~~~~~
   include/linux/kern_levels.h:5:25: warning: format '%s' expects argument of type 'char *', but argument 5 has type 'int' [-Wformat=]
       5 | #define KERN_SOH        "\001"          /* ASCII Start Of Header */
         |                         ^~~~~~
   include/linux/printk.h:429:25: note: in definition of macro 'printk_index_wrap'
     429 |                 _p_func(_fmt, ##__VA_ARGS__);                           \
         |                         ^~~~
   include/linux/printk.h:530:9: note: in expansion of macro 'printk'
     530 |         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         |         ^~~~~~
   include/linux/kern_levels.h:14:25: note: in expansion of macro 'KERN_SOH'
      14 | #define KERN_INFO       KERN_SOH "6"    /* informational */
         |                         ^~~~~~~~
   include/linux/printk.h:530:16: note: in expansion of macro 'KERN_INFO'
     530 |         printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
         |                ^~~~~~~~~
   kernel/rcu/tasks.h:942:9: note: in expansion of macro 'pr_info'
     942 |         pr_info("%s: %s grace period number %lu (since boot) gp_state: %s is %lu jiffies old.\n",
         |         ^~~~~~~
   cc1: some warnings being treated as errors


vim +/tasks_gp_state_getname +944 kernel/rcu/tasks.h

   937	
   938	static void tasks_rcu_exit_srcu_stall(struct timer_list *unused)
   939	{
   940		int rtsi = READ_ONCE(rcu_task_stall_info);
   941	
   942		pr_info("%s: %s grace period number %lu (since boot) gp_state: %s is %lu jiffies old.\n",
   943			__func__, rcu_tasks.kname, rcu_tasks.tasks_gp_seq,
 > 944			tasks_gp_state_getname(&rcu_tasks), jiffies - rcu_tasks.gp_jiffies);
   945		pr_info("Please check any exiting tasks stuck between calls to exit_tasks_rcu_start() and exit_tasks_rcu_finish()\n");
   946		tasks_rcu_exit_srcu_stall_timer.expires = jiffies + rtsi;
   947		add_timer(&tasks_rcu_exit_srcu_stall_timer);
   948	}
   949	

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