Re: [BUG v4.14-rt] kernel BUG at /work/rt/stable-rt.git/kernel/sched/core.c:1639!
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From: Steven Rostedt <rostedt@goodmis.org>
Date: 2018-08-22 16:17:55
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On Sun, 19 Aug 2018 08:28:35 +0200 Mike Galbraith [off-list ref] wrote:
On Sat, 2018-08-18 at 15:13 +0200, Mike Galbraith wrote:quoted
seems it has be something from the 4.17 cycle that went back to 4.14- stable after 4.1[56]-stable trees went extinct.See ("sched/core: Require cpu_active() in select_task_rq(), for user tasks") Fix it like so? sched: Allow pinned user tasks to be awakened to the CPU they pinned Since 7af443ee16976, select_fallback_rq() will BUG() if the CPU to which a task has pinned itself and pinned becomes !cpu_active() while it slept. Serving a 10 megaton eviction notice is neither helpful nor required, the task will migrate when it can do so.
This seems to fix the issue that I was seeing. Thanks! I'll add this to my repo as well. -- Steve
quoted hunk ↗ jump to hunk
Signed-off-by: Mike Galbraith <redacted> --- kernel/sched/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)--- a/kernel/sched/core.c +++ b/kernel/sched/core.c@@ -980,7 +980,7 @@ static inline bool is_cpu_allowed(struct if (!cpumask_test_cpu(cpu, p->cpus_ptr)) return false; - if (is_per_cpu_kthread(p)) + if (is_per_cpu_kthread(p) || __migrate_disabled(p)) return cpu_online(cpu); return cpu_active(cpu);