linux-kernel - [PATCH 5.14 011/162] cifs: Fix soft lockup during fsstress

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Message-Id: <20210927170233.841143414@linuxfoundation.org>
Date:   Mon, 27 Sep 2021 19:00:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Rohith Surabattula <rohiths@...rosoft.com>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 5.14 011/162] cifs: Fix soft lockup during fsstress

From: Rohith Surabattula <rohiths@...rosoft.com>

commit 71826b068884050d5fdd37fda857ba1539c513d3 upstream.

Below traces are observed during fsstress and system got hung.
[  130.698396] watchdog: BUG: soft lockup - CPU#6 stuck for 26s!

Cc: stable@...r.kernel.org # 5.13+
Signed-off-by: Rohith Surabattula <rohiths@...rosoft.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/cifs/misc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -736,7 +736,7 @@ cifs_close_deferred_file(struct cifsInod
 			if (cancel_delayed_work(&cfile->deferred)) {
 				tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
 				if (tmp_list == NULL)
-					continue;
+					break;
 				tmp_list->cfile = cfile;
 				list_add_tail(&tmp_list->list, &file_head);
 			}
@@ -767,7 +767,7 @@ cifs_close_all_deferred_files(struct cif
 			if (cancel_delayed_work(&cfile->deferred)) {
 				tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC);
 				if (tmp_list == NULL)
-					continue;
+					break;
 				tmp_list->cfile = cfile;
 				list_add_tail(&tmp_list->list, &file_head);
 			}