dialers/retrier.go: invalid memory address or nil pointer dereference

[hussainmohd-a]

tcp.Proxy [11] runtime error: invalid memory address or nil pointer dereference [gobind@v20251227143857-5a0c0c9]
 (#0)
<===>
goroutine 514 [running]:
github.com/celzero/firestack/intra/log.(*simpleLogger).Stack(0x40000f0008, 0x0?, {0x4000071400?, 0x79e63db4b8?}, {0x4000678000, 0x80000, 0x80000})
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/log/logger.go:482 +0x15c
github.com/celzero/firestack/intra/log.C({0x4000071400, 0x71}, {0x4000678000, 0x80000, 0x80000})
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/log/log.go:163 +0x8c
github.com/celzero/firestack/intra/core.applog(0x79e5f1bf01?, {0x4000071400, 0x71})
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/core/dontpanic.go:157 +0x188
github.com/celzero/firestack/intra/core.Recover(0xb, {0x79e67d58a0, 0x79e692e120})
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/core/dontpanic.go:130 +0x128
panic({0x79e680adc0?, 0x79e6e9c6b0?})
	runtime/panic.go:783 +0x120
github.com/celzero/firestack/intra/dialers.(*retrier).SyscallConn(0x79e6ea3b30?)
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/dialers/retrier.go:226 +0x18
github.com/celzero/firestack/intra/core.DisableKeepAlive({0x7db3c1fc80?, 0x0})
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/core/sockopt.go:70 +0x68
github.com/celzero/firestack/intra/ipn.maybeKeepAlive2({0x79e6942440?, 0x0})
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/ipn/auto.go:542 +0xa4
github.com/celzero/firestack/intra/ipn.maybeKeepAlive(...)
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/ipn/auto.go:525
github.com/celzero/firestack/intra/ipn.(*auto).dial(0x40002700e0, {0x79e5f147c2, 0x3}, {0x0, 0x0}, {0x400037eb60, 0x10})
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/ipn/auto.go:294 +0x718
github.com/celzero/firestack/intra/ipn.(*auto).Dial(0x400037e740?, {0x79e5f147c2?, 0x79e5f3fac6?}, {0x400037eb60?, 0x40004d2a80?})
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/ipn/auto.go:100 +0x34
github.com/celzero/firestack/intra.(*tcpHandler).handle(0x400003f1e8, {0x79e6947ee0, 0x40002700e0}, 0x4000547380, {{{0x0, 0xffff00000000}, {0x400000e498}}, 0xdf72}, {{{0x1?, 0x1?}, ...}, ...}, ...)
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/tcp.go:323 +0x36c
github.com/celzero/firestack/intra.(*tcpHandler).Proxy(0x400003f1e8, 0x4000547380, {{{0x0, 0xffff0a6fdf01}, {0x400000e498}}, 0xdf72}, {{{0x0, 0xffff6815533e}, {0x400000e498}}, 0x1bb})
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/tcp.go:273 +0x1040
github.com/celzero/firestack/intra/netstack.tcpForwarder.func1(0x400043cc80)
	github.com/celzero/firestack@v0.0.0-00010101000000-000000000000/intra/netstack/tcp.go:139 +0x41c
created by gvisor.dev/gvisor/pkg/tcpip/transport/tcp.(*Forwarder).HandlePacket in goroutine 59
	gvisor.dev/gvisor@v0.0.0-20250816201027-ba3b9ca85f20/pkg/tcpip/transport/tcp/forwarder.go:100 +0x2b4