From: Greg KH on
2.6.32-stable review patch. If anyone has any objections, please let us know.


From: Eric Dumazet <eric.dumazet(a)>

commit 2fc1b5dd99f66d93ffc23fd8df82d384c1a354c8 upstream.

Kernel bugzilla #15239

On some workloads, it is quite possible to get a huge dst list to
process in dst_gc_task(), and trigger soft lockup detection.

Fix is to call cond_resched(), as we run in process context.

Reported-by: Pawel Staszewski <pstaszewski(a)>
Tested-by: Pawel Staszewski <pstaszewski(a)>
Signed-off-by: Eric Dumazet <eric.dumazet(a)>
Signed-off-by: David S. Miller <davem(a)>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)>

net/core/dst.c | 2 ++
1 file changed, 2 insertions(+)

--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -17,6 +17,7 @@
#include <linux/string.h>
#include <linux/types.h>
#include <net/net_namespace.h>
+#include <linux/sched.h>

#include <net/dst.h>

@@ -79,6 +80,7 @@ loop:
while ((dst = next) != NULL) {
next = dst->next;
+ cond_resched();
if (likely(atomic_read(&dst->__refcnt))) {
last->next = dst;
last = dst;

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