From 52471beeb672df1915106ecad23746132eb25180 Mon Sep 17 00:00:00 2001
From: Rik van Riel <riel@surriel.com>
Date: Tue, 7 May 2024 09:18:58 -0400
Subject: [PATCH] fs/proc: fix softlockup in __read_vmcore
commit 5cbcb62dddf5346077feb82b7b0c9254222d3445 upstream.
While taking a kernel core dump with makedumpfile on a larger system,
softlockup messages often appear.
While softlockup warnings can be harmless, they can also interfere with
things like RCU freeing memory, which can be problematic when the kdump
kexec image is configured with as little memory as possible.
Avoid the softlockup, and give things like work items and RCU a chance to
do their thing during __read_vmcore by adding a cond_resched.
Link: https://lkml.kernel.org/r/20240507091858.36ff767f@imladris.surriel.com
Signed-off-by: Rik van Riel <riel@surriel.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/proc/vmcore.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 1ec0647a20268..f4d5db3597187 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -383,6 +383,8 @@ static ssize_t __read_vmcore(struct iov_iter *iter, loff_t *fpos)
/* leave now if filled buffer already */
if (!iov_iter_count(iter))
return acc;
+
+ cond_resched();
}
list_for_each_entry(m, &vmcore_list, list) {
--
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