diff options
Diffstat (limited to 'pkg')
| -rw-r--r-- | pkg/tcpip/stack/neighbor_entry.go | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/pkg/tcpip/stack/neighbor_entry.go b/pkg/tcpip/stack/neighbor_entry.go index aec77610d..493e48031 100644 --- a/pkg/tcpip/stack/neighbor_entry.go +++ b/pkg/tcpip/stack/neighbor_entry.go @@ -17,12 +17,19 @@ package stack import ( "fmt" "sync" + "time" "gvisor.dev/gvisor/pkg/sleep" "gvisor.dev/gvisor/pkg/tcpip" "gvisor.dev/gvisor/pkg/tcpip/header" ) +const ( + // immediateDuration is a duration of zero for scheduling work that needs to + // be done immediately but asynchronously to avoid deadlock. + immediateDuration time.Duration = 0 +) + // NeighborEntry describes a neighboring device in the local network. type NeighborEntry struct { Addr tcpip.Address @@ -242,7 +249,12 @@ func (e *neighborEntry) setStateLocked(next NeighborState) { e.job.Schedule(config.RetransmitTimer) } - sendUnicastProbe() + // Send a probe in another gorountine to free this thread of execution + // for finishing the state transition. This is necessary to avoid + // deadlock where sending and processing probes are done synchronously, + // such as loopback and integration tests. + e.job = e.nic.stack.newJob(&e.mu, sendUnicastProbe) + e.job.Schedule(immediateDuration) case Failed: e.notifyWakersLocked() @@ -324,7 +336,12 @@ func (e *neighborEntry) handlePacketQueuedLocked(localAddr tcpip.Address) { e.job.Schedule(config.RetransmitTimer) } - sendMulticastProbe() + // Send a probe in another gorountine to free this thread of execution + // for finishing the state transition. This is necessary to avoid + // deadlock where sending and processing probes are done synchronously, + // such as loopback and integration tests. + e.job = e.nic.stack.newJob(&e.mu, sendMulticastProbe) + e.job.Schedule(immediateDuration) case Stale: e.setStateLocked(Delay) |