commit 5e06a678544b1fde2517a10041e802265f098e0b
Author: Olivier Houchard <ohouchard@haproxy.com>
Date:   Fri Jan 10 16:46:48 2020 +0100

    BUG/MEDIUM: tasks: Use the MT macros in tasklet_free().
    
    In tasklet_free(), to attempt to remove ourself, use MT_LIST_DEL, we can't
    just use LIST_DEL(), as we theorically could be in the shared tasklet list.
    
    This should be backported to 2.1.
    
    (cherry picked from commit 3c4f40acbf6cd33b874b224a89ee2a64eb3035d5)
    Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>

diff --git a/include/proto/task.h b/include/proto/task.h
index bba71930c..f237d0dd2 100644
--- a/include/proto/task.h
+++ b/include/proto/task.h
@@ -397,10 +397,8 @@ static inline void task_destroy(struct task *t)
 /* Should only be called by the thread responsible for the tasklet */
 static inline void tasklet_free(struct tasklet *tl)
 {
-	if (!LIST_ISEMPTY(&tl->list)) {
-		LIST_DEL(&tl->list);
+	if (MT_LIST_DEL((struct mt_list *)&tl->list))
 		_HA_ATOMIC_SUB(&tasks_run_queue, 1);
-	}
 
 	pool_free(pool_head_tasklet, tl);
 	if (unlikely(stopping))