From: Daniel Dragomir <[email protected]>
Multiple alarming messages are shown on running tcp bandwidth test
from lmbench suite and the test fails with timeout:
Dead loop on virtual device lo, fix it urgently!
The cause for this failure is commit edbe65322391 ("net: place xmit
recursion in softnet data") which overwrites some preempt-rt specific
changes (PREEMPT_RT_FULL) from commit 7963359759cb ("net: move
xmit_recursion to per-task variable on -RT ").
The original version for commit edbe65322391 from kernel.org:
https://lkml.org/lkml/2020/6/29/1000
Signed-off-by: Daniel Dragomir <[email protected]>
---
net/core/dev.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/core/dev.c b/net/core/dev.c
index 6f7e36e..1734396 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3834,7 +3834,11 @@ static int __dev_queue_xmit(struct sk_buff *skb, struct
net_device *sb_dev)
if (dev->flags & IFF_UP) {
int cpu = smp_processor_id(); /* ok because BHs are off */
+#ifdef CONFIG_PREEMPT_RT_FULL
+ if (txq->xmit_lock_owner != current) {
+#else
if (txq->xmit_lock_owner != cpu) {
+#endif
if (dev_xmit_recursion())
goto recursion_alert;
--
2.7.4
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