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authorWander Lairson Costa <wander@redhat.com>2024-07-24 11:22:47 -0300
committerPeter Zijlstra <peterz@infradead.org>2024-12-02 12:01:29 +0100
commit0664e2c311b9fa43b33e3e81429cd0c2d7f9c638 (patch)
tree4c821d1358aba396b9f5552a2142e59b9c6a407b
parentf66e4a996582d59b6f5ce88078b0ad2a328aa532 (diff)
sched/deadline: Fix warning in migrate_enable for boosted tasks
When running the following command: while true; do stress-ng --cyclic 30 --timeout 30s --minimize --quiet done a warning is eventually triggered: WARNING: CPU: 43 PID: 2848 at kernel/sched/deadline.c:794 setup_new_dl_entity+0x13e/0x180 ... Call Trace: <TASK> ? show_trace_log_lvl+0x1c4/0x2df ? enqueue_dl_entity+0x631/0x6e0 ? setup_new_dl_entity+0x13e/0x180 ? __warn+0x7e/0xd0 ? report_bug+0x11a/0x1a0 ? handle_bug+0x3c/0x70 ? exc_invalid_op+0x14/0x70 ? asm_exc_invalid_op+0x16/0x20 enqueue_dl_entity+0x631/0x6e0 enqueue_task_dl+0x7d/0x120 __do_set_cpus_allowed+0xe3/0x280 __set_cpus_allowed_ptr_locked+0x140/0x1d0 __set_cpus_allowed_ptr+0x54/0xa0 migrate_enable+0x7e/0x150 rt_spin_unlock+0x1c/0x90 group_send_sig_info+0xf7/0x1a0 ? kill_pid_info+0x1f/0x1d0 kill_pid_info+0x78/0x1d0 kill_proc_info+0x5b/0x110 __x64_sys_kill+0x93/0xc0 do_syscall_64+0x5c/0xf0 entry_SYSCALL_64_after_hwframe+0x6e/0x76 RIP: 0033:0x7f0dab31f92b This warning occurs because set_cpus_allowed dequeues and enqueues tasks with the ENQUEUE_RESTORE flag set. If the task is boosted, the warning is triggered. A boosted task already had its parameters set by rt_mutex_setprio, and a new call to setup_new_dl_entity is unnecessary, hence the WARN_ON call. Check if we are requeueing a boosted task and avoid calling setup_new_dl_entity if that's the case. Fixes: 295d6d5e3736 ("sched/deadline: Fix switching to -deadline") Signed-off-by: Wander Lairson Costa <wander@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Juri Lelli <juri.lelli@redhat.com> Link: https://lore.kernel.org/r/20240724142253.27145-2-wander@redhat.com
-rw-r--r--kernel/sched/deadline.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 206691d35b7d..db47f33cb7d2 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -2042,6 +2042,7 @@ enqueue_dl_entity(struct sched_dl_entity *dl_se, int flags)
} else if (flags & ENQUEUE_REPLENISH) {
replenish_dl_entity(dl_se);
} else if ((flags & ENQUEUE_RESTORE) &&
+ !is_dl_boosted(dl_se) &&
dl_time_before(dl_se->deadline, rq_clock(rq_of_dl_se(dl_se)))) {
setup_new_dl_entity(dl_se);
}