[bug]: lnd crashes with panic: runtime error: invalid memory address or nil pointer dereference

[greenart7c3]

Background

lnd crashes with panic: runtime error: invalid memory address or nil pointer dereference

Your environment

lnd 0.18.4-beta
Ubuntu
bitcoind

Steps to reproduce

Don't know how to reproduce this but its happening a lot today. The service starts and after a while a get this error

Dec 31 18:44:24 greenart7c3-desktop lnd[820440]: panic: runtime error: invalid memory address or nil pointer dereference
Dec 31 18:44:24 greenart7c3-desktop lnd[820440]: [signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0x497698]
Dec 31 18:44:24 greenart7c3-desktop lnd[820440]: goroutine 30519 [running]:
Dec 31 18:44:24 greenart7c3-desktop lnd[820440]: sync.(*RWMutex).Lock(0xc000273180?)
Dec 31 18:44:24 greenart7c3-desktop lnd[820440]:         sync/rwmutex.go:146 +0x18
Dec 31 18:44:24 greenart7c3-desktop lnd[820440]: github.com/lightningnetwork/lnd/lnwallet/chainfee.(*filterManager).updateMedian(0xc0041e6f00, {0xc00237b500, 0x8, 0x8})
Dec 31 18:44:24 greenart7c3-desktop lnd[820440]:         github.com/lightningnetwork/lnd/lnwallet/chainfee/filtermanager.go:208 +0x5f
Dec 31 18:44:24 greenart7c3-desktop lnd[820440]: github.com/lightningnetwork/lnd/lnwallet/chainfee.(*filterManager).fetchPeerFilters(0xc0041e6f00)
Dec 31 18:44:24 greenart7c3-desktop lnd[820440]:         github.com/lightningnetwork/lnd/lnwallet/chainfee/filtermanager.go:87 +0xc5
Dec 31 18:44:24 greenart7c3-desktop lnd[820440]: created by github.com/lightningnetwork/lnd/lnwallet/chainfee.(*filterManager).Start in goroutine 1
Dec 31 18:44:24 greenart7c3-desktop lnd[820440]:         github.com/lightningnetwork/lnd/lnwallet/chainfee/filtermanager.go:60 +0x65

Expected behaviour

Actual behaviour

[Crypt-iQ]

@greenart7c3 what Go version are you using?

[greenart7c3]

go version go1.23.1 linux/amd64

[Crypt-iQ]

@greenart7c3 did you compile lnd yourself or did you use some sort of installer? I ask because the crashing line number in sync.rwmutex.go seems a little off if the go version used was go1.23.1 but I could be missing something.

[greenart7c3]

I used the compiled version from the releases

[Crypt-iQ]

I looked it up and the compiled version uses go1.22.6 and it looks like the mutex is nil for some reason