kqueue: avoid a possible fork-deadlock

kqueue_fork_copy() is likely to have transitioned at least one knote
through a flux state, so we should check whether we need to wake
anything up on the way out to avoid a possible deadlock.

This was a part of D56210, but we'll close the review with the next
commit.

Fixes:	b11289f871 ("kqueuex(2): add KQUEUE_CPONFORK")
Reviewed by:	kib, markj

This commit is contained in:

Kyle Evans

2026-04-01 17:30:48 -05:00

parent 0b4f0e0515

commit 14d0baf2e8

1 changed files with 1 additions and 1 deletions

									
										sys/kern/kern_event.c
									
		+1
		-1
	
												View File
												
				@@ -3147,7 +3147,7 @@ kqueue_fork_copy(struct filedesc *fdp, struct file *fp, struct file *fp1,

					}

					kqueue_release(kq, 1);

					kq1->kq_forksrc = NULL;

					KQ_UNLOCK(kq);

					KQ_UNLOCK_FLUX(kq);

					knote_free(marker);

					return (error);