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* [chrome-os:chromeos-5.4 19643/20381] kernel/sched/rt.c:2146:36: sparse: sparse: context imbalance in 'pull_rt_task' - unexpected unlock
@ 2020-11-19 20:11 kernel test robot
  0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2020-11-19 20:11 UTC (permalink / raw)
  To: kbuild

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CC: kbuild-all(a)lists.01.org
TO: cros-kernel-buildreports(a)googlegroups.com
TO: Guenter Roeck <groeck@google.com>

tree:   https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.4
head:   b125f54b0e590d1c99581ddd6d9fbb09d375217e
commit: cfd78171703824626eaffd18de9c0c0bba0698d8 [19643/20381] CHROMIUM: Merge 'v5.4.73' into chromeos-5.4
:::::: branch date: 4 hours ago
:::::: commit date: 3 weeks ago
config: ia64-randconfig-s031-20201119 (attached as .config)
compiler: ia64-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-123-g626c4742-dirty
        git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel
        git fetch --no-tags chrome-os chromeos-5.4
        git checkout cfd78171703824626eaffd18de9c0c0bba0698d8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=ia64 

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


"sparse warnings: (new ones prefixed by >>)"
   kernel/sched/rt.c: note: in included file (through arch/ia64/include/uapi/asm/unistd.h, arch/ia64/include/asm/unistd.h, include/uapi/linux/unistd.h, ...):
   ./arch/ia64/include/generated/uapi/asm/unistd_64.h:348:39: sparse: sparse: no newline at end of file
   kernel/sched/rt.c:1717:9: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct sched_domain *[assigned] sd @@     got struct sched_domain [noderef] <asn:4> *parent @@
   kernel/sched/rt.c:1717:9: sparse:     expected struct sched_domain *[assigned] sd
   kernel/sched/rt.c:1717:9: sparse:     got struct sched_domain [noderef] <asn:4> *parent
   kernel/sched/rt.c:1782:40: sparse: sparse: context imbalance in 'find_lock_lowest_rq' - unexpected unlock
   kernel/sched/rt.c: note: in included file:
   kernel/sched/sched.h:2234:17: sparse: sparse: context imbalance in 'push_rt_task' - unexpected unlock
>> kernel/sched/rt.c:2146:36: sparse: sparse: context imbalance in 'pull_rt_task' - unexpected unlock

vim +/pull_rt_task +2146 kernel/sched/rt.c

b6366f048e0caff kernel/sched/rt.c Steven Rostedt  2015-03-18  2123  
c6c4927b22a3514 kernel/sched_rt.c Rusty Russell   2008-11-25  2124  	for_each_cpu(cpu, this_rq->rd->rto_mask) {
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2125  		if (this_cpu == cpu)
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2126  			continue;
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2127  
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2128  		src_rq = cpu_rq(cpu);
74ab8e4f6412c0b kernel/sched_rt.c Gregory Haskins 2008-12-29  2129  
74ab8e4f6412c0b kernel/sched_rt.c Gregory Haskins 2008-12-29  2130  		/*
74ab8e4f6412c0b kernel/sched_rt.c Gregory Haskins 2008-12-29  2131  		 * Don't bother taking the src_rq->lock if the next highest
74ab8e4f6412c0b kernel/sched_rt.c Gregory Haskins 2008-12-29  2132  		 * task is known to be lower-priority than our current task.
74ab8e4f6412c0b kernel/sched_rt.c Gregory Haskins 2008-12-29  2133  		 * This may look racy, but if this value is about to go
74ab8e4f6412c0b kernel/sched_rt.c Gregory Haskins 2008-12-29  2134  		 * logically higher, the src_rq will push this task away.
74ab8e4f6412c0b kernel/sched_rt.c Gregory Haskins 2008-12-29  2135  		 * And if its going logically lower, we do not care
74ab8e4f6412c0b kernel/sched_rt.c Gregory Haskins 2008-12-29  2136  		 */
74ab8e4f6412c0b kernel/sched_rt.c Gregory Haskins 2008-12-29  2137  		if (src_rq->rt.highest_prio.next >=
74ab8e4f6412c0b kernel/sched_rt.c Gregory Haskins 2008-12-29  2138  		    this_rq->rt.highest_prio.curr)
74ab8e4f6412c0b kernel/sched_rt.c Gregory Haskins 2008-12-29  2139  			continue;
74ab8e4f6412c0b kernel/sched_rt.c Gregory Haskins 2008-12-29  2140  
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2141  		/*
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2142  		 * We can potentially drop this_rq's lock in
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2143  		 * double_lock_balance, and another CPU could
a8728944efe2341 kernel/sched_rt.c Gregory Haskins 2008-12-29  2144  		 * alter this_rq
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2145  		 */
a8728944efe2341 kernel/sched_rt.c Gregory Haskins 2008-12-29 @2146  		double_lock_balance(this_rq, src_rq);
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2147  
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2148  		/*
e23ee74777f3893 kernel/sched/rt.c Kirill Tkhai    2013-06-07  2149  		 * We can pull only a task, which is pushable
e23ee74777f3893 kernel/sched/rt.c Kirill Tkhai    2013-06-07  2150  		 * on its rq, and no others.
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2151  		 */
e23ee74777f3893 kernel/sched/rt.c Kirill Tkhai    2013-06-07  2152  		p = pick_highest_pushable_task(src_rq, this_cpu);
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2153  
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2154  		/*
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2155  		 * Do we have an RT task that preempts
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2156  		 * the to-be-scheduled task?
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2157  		 */
a8728944efe2341 kernel/sched_rt.c Gregory Haskins 2008-12-29  2158  		if (p && (p->prio < this_rq->rt.highest_prio.curr)) {
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2159  			WARN_ON(p == src_rq->curr);
da0c1e65b51a289 kernel/sched/rt.c Kirill Tkhai    2014-08-20  2160  			WARN_ON(!task_on_rq_queued(p));
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2161  
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2162  			/*
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2163  			 * There's a chance that p is higher in priority
97fb7a0a8944bd6 kernel/sched/rt.c Ingo Molnar     2018-03-03  2164  			 * than what's currently running on its CPU.
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2165  			 * This is just that p is wakeing up and hasn't
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2166  			 * had a chance to schedule. We only pull
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2167  			 * p if it is lower in priority than the
a8728944efe2341 kernel/sched_rt.c Gregory Haskins 2008-12-29  2168  			 * current task on the run queue
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2169  			 */
a8728944efe2341 kernel/sched_rt.c Gregory Haskins 2008-12-29  2170  			if (p->prio < src_rq->curr->prio)
614ee1f61f667b0 kernel/sched_rt.c Mike Galbraith  2008-01-25  2171  				goto skip;
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2172  
8046d6806247088 kernel/sched/rt.c Peter Zijlstra  2015-06-11  2173  			resched = true;
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2174  
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2175  			deactivate_task(src_rq, p, 0);
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2176  			set_task_cpu(p, this_cpu);
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2177  			activate_task(this_rq, p, 0);
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2178  			/*
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2179  			 * We continue with the search, just in
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2180  			 * case there's an even higher prio task
25985edcedea639 kernel/sched_rt.c Lucas De Marchi 2011-03-30  2181  			 * in another runqueue. (low likelihood
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2182  			 * but possible)
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2183  			 */
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2184  		}
614ee1f61f667b0 kernel/sched_rt.c Mike Galbraith  2008-01-25  2185  skip:
1b12bbc747560ea kernel/sched_rt.c Peter Zijlstra  2008-08-11  2186  		double_unlock_balance(this_rq, src_rq);
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2187  	}
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2188  
8046d6806247088 kernel/sched/rt.c Peter Zijlstra  2015-06-11  2189  	if (resched)
8046d6806247088 kernel/sched/rt.c Peter Zijlstra  2015-06-11  2190  		resched_curr(this_rq);
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2191  }
f65eda4f789168b kernel/sched_rt.c Steven Rostedt  2008-01-25  2192  

:::::: The code at line 2146 was first introduced by commit
:::::: a8728944efe23417e38bf22063f06d9d8ee21d59 sched: use highest_prio.curr for pull threshold

:::::: TO: Gregory Haskins <ghaskins@novell.com>
:::::: CC: Gregory Haskins <ghaskins@novell.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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