fatal: unlockSlow() - packet_buffer_refs.go:127

[hussainmohd-a]

goroutine 109 [running]:
internal/sync.fatal({0x705dd54f9e?, 0x70571b25a0?})
	runtime/panic.go:1191 +0x20
internal/sync.(*Mutex).unlockSlow(0x7056f0e7b8, 0xffffffff)
	internal/sync/mutex.go:204 +0x38
internal/sync.(*Mutex).Unlock(...)
	internal/sync/mutex.go:198
sync.(*Mutex).Unlock(...)
	sync/mutex.go:65
panic({0x705eb32720?, 0x7056fa6250?})
	runtime/panic.go:860 +0x12c
gvisor.dev/gvisor/pkg/tcpip/stack.(*packetBufferRefs).DecRef(0x7056ef0140, 0x7000000800?)
	gvisor.dev/gvisor@v0.0.0-20260508212337-96dad6a2da94/pkg/tcpip/stack/packet_buffer_refs.go:127 +0x12c
gvisor.dev/gvisor/pkg/tcpip/stack.(*PacketBuffer).DecRef(...)
	gvisor.dev/gvisor@v0.0.0-20260508212337-96dad6a2da94/pkg/tcpip/stack/packet_buffer.go:199
github.com/celzero/firestack/intra/netstack.(*processor).deliverPackets(0x7056f0e7b8)
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/netstack/forwarders.go:172 +0x180
github.com/celzero/firestack/intra/netstack.(*processor).start(0x7056f0e7b8, 0x3?)
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/netstack/forwarders.go:150 +0xc4
github.com/celzero/firestack/intra/core.Gx1[...].func1()
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/core/async.go:98 +0xb0
created by github.com/celzero/firestack/intra/core.Gx1[...] in goroutine 52
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/core/async.go:92 +0x98
	

[ignoramous]

panic1:

panic({0x705eb32720?, 0x7056fa6250?})
	runtime/panic.go:860 +0x12c
gvisor.dev/gvisor/pkg/tcpip/stack.(*packetBufferRefs).DecRef(0x7056ef0140, 0x7000000800?)
	gvisor.dev/gvisor@v0.0.0-20260508212337-96dad6a2da94/pkg/tcpip/stack/packet_buffer_refs.go:127 +0x12c
gvisor.dev/gvisor/pkg/tcpip/stack.(*PacketBuffer).DecRef(...)
	gvisor.dev/gvisor@v0.0.0-20260508212337-96dad6a2da94/pkg/tcpip/stack/packet_buffer.go:199
github.com/celzero/firestack/intra/netstack.(*processor).deliverPackets(0x7056f0e7b8)
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/netstack/forwarders.go:172 +0x180
github.com/celzero/firestack/intra/netstack.(*processor).start(0x7056f0e7b8, 0x3?)
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/netstack/forwarders.go:150 +0xc4
github.com/celzero/firestack/intra/core.Gx1[...].func1()
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/core/async.go:98 +0xb0
created by github.com/celzero/firestack/intra/core.Gx1[...] in goroutine 52
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/core/async.go:92 +0x98

stack.(*packetBufferRefs).DecRef()

func (r *packetBufferRefs) DecRef(destroy func()) {
	v := r.refCount.Add(-1)
	if packetBufferenableLogging {
		refs.LogDecRef(r, v)
	}
	switch {
	case v < 0:
-		panic(fmt.Sprintf("Decrementing non-positive ref count %p, owned by %s", r, r.RefType()))

	case v == 0:
		refs.Unregister(r)

		if destroy != nil {
			destroy()
		}
	}
}

[ignoramous]

panic2:

goroutine 109 [running]:
internal/sync.fatal({0x705dd54f9e?, 0x70571b25a0?})
	runtime/panic.go:1191 +0x20
internal/sync.(*Mutex).unlockSlow(0x7056f0e7b8, 0xffffffff)
	internal/sync/mutex.go:204 +0x38
internal/sync.(*Mutex).Unlock(...)
	internal/sync/mutex.go:198
sync.(*Mutex).Unlock(...)
	sync/mutex.go:65

internal/sync.(*Mutex).unlockSlow

func (m *Mutex) unlockSlow(new int32) {
	if (new+mutexLocked)&mutexLocked == 0 {
-		fatal("sync: unlock of unlocked mutex")
	}