From f545b6ae00ef77df710ddace328d13e8c5c265bf Mon Sep 17 00:00:00 2001
From: Sara Hartse <sara.hartse@gmail.com>
Date: Fri, 15 Feb 2019 14:44:56 -0800
Subject: [PATCH] Delay injection can cause indefinitely hung zios

If we hit the (NSEC_TO_TICK(diff) == 0) condition in
zio_delay_interrupt, zio_interrupt is never called and the
zio does not progress.

Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: sara hartse <sara.hartse@delphix.com>
Closes #8404
---
 module/zfs/zio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/module/zfs/zio.c b/module/zfs/zio.c
index 0dd63322f0c7..7bb3c08256a2 100644
--- a/module/zfs/zio.c
+++ b/module/zfs/zio.c
@@ -1834,6 +1834,7 @@ zio_delay_interrupt(zio_t *zio)
 			if (NSEC_TO_TICK(diff) == 0) {
 				/* Our delay is less than a jiffy - just spin */
 				zfs_sleep_until(zio->io_target_timestamp);
+				zio_interrupt(zio);
 			} else {
 				/*
 				 * Use taskq_dispatch_delay() in the place of