Re: [syzbot] [xfs?] [mm?] WARNING: bad unlock balance in __mm_populate

[Edward Adam Davis]

#syz test

diff --git a/mm/gup.c b/mm/gup.c
index 3883b307780e..290fcdb760a1 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2030,6 +2030,7 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
 		 * if the vma was already munlocked.
 		 */
 		ret = populate_vma_page_range(vma, nstart, nend, &locked);
+		printk("mm: %p, mmap lock held: %d, locked: %d, %s\n", mm, lockdep_is_held(&mm->mmap_lock), locked, __func__);
 		if (ret < 0) {
 			if (ignore_errors) {
 				ret = 0;