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If anyone has any objections, please let me know. > > ------------------ > > From: Yunseong Kim > > [ Upstream commit bab4923132feb3e439ae45962979c5d9d5c7c1f1 ] > > In the TRACE_EVENT(qdisc_reset) NULL dereference occurred from > > qdisc->dev_queue->dev ->name > > This situation simulated from bunch of veths and Bluetooth disconnection > and reconnection. > > During qdisc initialization, qdisc was being set to noop_queue. > In veth_init_queue, the initial tx_num was reduced back to one, > causing the qdisc reset to be called with noop, which led to the kernel > panic. > Fixes: 51270d573a8d ("tracing/net_sched: Fix tracepoints that save qdisc_dev() as a string") > Link: https://lore.kernel.org/lkml/20240229143432.273b4871@gandalf.local.home/t/ > Cc: netdev@vger.kernel.org > Tested-by: Yunseong Kim > Signed-off-by: Yunseong Kim > Signed-off-by: Yeoreum Yun > Link: https://lore.kernel.org/r/20240624173320.24945-4-yskelg@gmail.com > Signed-off-by: Paolo Abeni > Signed-off-by: Sasha Levin > --- > include/trace/events/qdisc.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/trace/events/qdisc.h b/include/trace/events/qdisc.h > index a50df41634c58..f661d3d7c410a 100644 > --- a/include/trace/events/qdisc.h > +++ b/include/trace/events/qdisc.h > @@ -53,7 +53,7 @@ TRACE_EVENT(qdisc_reset, > TP_ARGS(q), > > TP_STRUCT__entry( > - __string( dev, qdisc_dev(q)->name ) > + __string( dev, qdisc_dev(q) ? qdisc_dev(q)->name : "(null)" ) > __string( kind, q->ops->id ) > __field( u32, parent ) > __field( u32, handle ) Since that code changed in +v5.10.213, +v5.15.152, +v6.1.82 +v6.6.22 +v6.7.10, +v6.8, +6.9 and the stable is in an intermediate state. commit 2c92ca849fcc ("tracing/treewide: Remove second parameter of __assign_str()") Link: https://lore.kernel.org/linux-trace-kernel/20240516133454.681ba6a0@rorschach.local.home/ I had to fix some other part for the stable branch backporting. So, I submit another patch. Please check out. Link: https://lore.kernel.org/stable/20240702180146.5126-2-yskelg@gmail.com/T/#u --- include/trace/events/qdisc.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/trace/events/qdisc.h b/include/trace/events/qdisc.h index 1f4258308b96..061fd4960303 100644 --- a/include/trace/events/qdisc.h +++ b/include/trace/events/qdisc.h @@ -81,14 +81,14 @@ TRACE_EVENT(qdisc_reset, TP_ARGS(q), TP_STRUCT__entry( - __string( dev, qdisc_dev(q)->name ) + __string( dev, qdisc_dev(q) ? qdisc_dev(q)->name : "(null)" ) __string( kind, q->ops->id ) __field( u32, parent ) __field( u32, handle ) ), TP_fast_assign( - __assign_str(dev, qdisc_dev(q)->name); + __assign_str(dev, qdisc_dev(q) ? qdisc_dev(q)->name : "(null)"); __assign_str(kind, q->ops->id); __entry->parent = q->parent; __entry->handle = q->handle; --