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Tailscale crash after upgrade

ragnaroknroll

Regular Contributor
I'm running AsusWRT Merlin v3004.388.11 on an RT-AX86U router and just updated tailscale to v1.96.1 on Entware. After the upgrade, tailscale seems to crash each time I try to turn it on, with the following error:

Code:
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x885080]

goroutine 427 [running]:
github.com/coreos/go-iptables/iptables.(*IPTables).runWithOutput(0x0, {0x7f2a24fbc0, 0x4, 0xb5fb00?}, {0xe5ff68, 0x7f2a754c90})
    github.com/coreos/[email protected]/iptables/iptables.go:560 +0x50
github.com/coreos/go-iptables/iptables.(*IPTables).executeList(0x0, {0x7f2a24fbc0, 0x4, 0x4})
    github.com/coreos/[email protected]/iptables/iptables.go:462 +0x58
github.com/coreos/go-iptables/iptables.(*IPTables).List(0x0, {0xdb8805, 0x6}, {0xdbdf67, 0xa})
    github.com/coreos/[email protected]/iptables/iptables.go:283 +0xc0
tailscale.com/util/linuxfw.(*iptablesRunner).AddConnmarkSaveRule(0x7f328b0600)
    tailscale.com/util/linuxfw/iptables_runner.go:537 +0x90
tailscale.com/wgengine/router/osrouter.(*linuxRouter).Set(0x7f32c5c000, 0x26?)
    tailscale.com/wgengine/router/osrouter/router_linux.go:498 +0x9e4
tailscale.com/wgengine.(*userspaceEngine).Reconfig(0x7f32a5ea88, 0x7f2a1ba240, 0x7f2a4181b0, 0x7f2a077500)
    tailscale.com/wgengine/userspace.go:1157 +0x10f0
tailscale.com/wgengine.(*watchdogEngine).Reconfig.func1()
    tailscale.com/wgengine/watchdog.go:176 +0x2c
tailscale.com/wgengine.(*watchdogEngine).watchdogErr.func2()
    tailscale.com/wgengine/watchdog.go:121 +0x28
created by tailscale.com/wgengine.(*watchdogEngine).watchdogErr in goroutine 467
    tailscale.com/wgengine/watchdog.go:120 +0x204

Doing a bit of troubleshooting with Gemini, it appears that turning tailscale on with the --netfilter-mode=off flag works and doesn't cause it to crash. Anybody else facing the same issue? Any suggestions?
 

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