Sia still crashes on initial sync (since months)

while testing SIA for stability 2 -3 month ago, I ran into SIA always crash on initial sync. giving it a second try, it still has the same pbl. it's just unable to sync and crashes always around 83 - 88%. I tried 3 times now, always deleting the complete ~/.config/Sia-UI SIA is running in an LXC with an btrfs-backend. OS: debian stretch (host) LXC: Ubuntu 16.10
it's not a out-of disk-space pbl.
A critical error loading Sia has occured: Siad unexpectedly exited. Error log: Loading...
(0/6) Loading siad...
(1/6) Loading gateway...
(2/6) Loading consensus...
(3/6) Loading transaction pool...
(4/6) Loading wallet...
(5/6) Loading host...
goroutine 1 [running]:
runtime/debug.Stack(0x4457c7, 0x0, 0xc4200a4ec8)
    /usr/local/go/src/runtime/debug/stack.go:24 +0x79
runtime/debug.PrintStack()
    /usr/local/go/src/runtime/debug/stack.go:16 +0x22
github.com/NebulousLabs/Sia/build.Severe(0xc4200a5038, 0x2, 0x2)
    /home/luke/go/src/github.com/NebulousLabs/Sia/build/critical.go:32 +0x92
github.com/NebulousLabs/Sia/persist.(*Logger).Severe(0xc420388160, 0xc4200a5038, 0x2, 0x2)
    /home/luke/go/src/github.com/NebulousLabs/Sia/persist/log.go:71 +0xe0
github.com/NebulousLabs/Sia/modules/host/contractmanager.(*writeAheadLog).createWALTmp(0xc4203ae308)
    /home/luke/go/src/github.com/NebulousLabs/Sia/modules/host/contractmanager/writeaheadlog.go:201 +0x1f3
github.com/NebulousLabs/Sia/modules/host/contractmanager.(*writeAheadLog).load(0xc4203ae308, 0x0, 0x0)
    /home/luke/go/src/github.com/NebulousLabs/Sia/modules/host/contractmanager/writeaheadlog.go:259 +0x43
github.com/NebulousLabs/Sia/modules/host/contractmanager.newContractManager(0xde2a20, 0xc4203880e0, 0xc4203b55c0, 0x35, 0x0, 0x0, 0x0)
    /home/luke/go/src/github.com/NebulousLabs/Sia/modules/host/contractmanager/contractmanager.go:163 +0x4ed
github.com/NebulousLabs/Sia/modules/host/contractmanager.New(0xc4203b55c0, 0x35, 0x2, 0xc4203b55c0, 0x35)
    /home/luke/go/src/github.com/NebulousLabs/Sia/modules/host/contractmanager/contractmanager.go:226 +0x5b
github.com/NebulousLabs/Sia/modules/host.newHost(0xde2ba0, 0xf05908, 0xde35c0, 0xc420149b80, 0xde27a0, 0xc4203846e0, 0xde5e80, 0xc4203849a0, 0x7fff0febbbda, 0x5, ...)
    /home/luke/go/src/github.com/NebulousLabs/Sia/modules/host/host.go:262 +0x4a5
github.com/NebulousLabs/Sia/modules/host.New(0xde35c0, 0xc420149b80, 0xde27a0, 0xc4203846e0, 0xde5e80, 0xc4203849a0, 0x7fff0febbbda, 0x5, 0xc420166540, 0x25, ...)
    /home/luke/go/src/github.com/NebulousLabs/Sia/modules/host/host.go:298 +0xd8
main.startDaemon(0x0, 0x0, 0x7fff0febbbbf, 0xe, 0x7fff0febbbeb, 0x5, 0x7fff0febbbda, 0x5, 0x0, 0x7fff0febbc2c, ...)
    /home/luke/go/src/github.com/NebulousLabs/Sia/siad/daemon.go:250 +0xf3c
main.startDaemonCmd(0xc42008efc0, 0xc42005d1d0, 0x0, 0x5)
    /home/luke/go/src/github.com/NebulousLabs/Sia/siad/daemon.go:335 +0x162
github.com/spf13/cobra.(*Command).execute(0xc42008efc0, 0xc4200100d0, 0x5, 0x5, 0xc42008efc0, 0xc4200100d0)
    /home/luke/go/src/github.com/spf13/cobra/command.go:653 +0x299
github.com/spf13/cobra.(*Command).ExecuteC(0xc42008efc0, 0xaf832c, 0x3b, 0xc420158b40)
    /home/luke/go/src/github.com/spf13/cobra/command.go:728 +0x339
github.com/spf13/cobra.(*Command).Execute(0xc42008efc0, 0xee9020, 0xae0d0e)
    /home/luke/go/src/github.com/spf13/cobra/command.go:687 +0x2b
main.main()
    /home/luke/go/src/github.com/NebulousLabs/Sia/siad/main.go:174 +0x7aa
Severe error: Unable to create WAL temporary file: open /home/guenter/.config/Sia-UI/sia/host/contractmanager/contractmanager.wal_temp: permission denied
Closing wallet...
Closing transaction pool...
Closing consensus...
Closing gateway...
panic: unable to create WAL temporary file, crashing to avoid corruption

goroutine 1 [running]:
github.com/NebulousLabs/Sia/modules/host/contractmanager.(*writeAheadLog).createWALTmp(0xc4203ae308)
    /home/luke/go/src/github.com/NebulousLabs/Sia/modules/host/contractmanager/writeaheadlog.go:202 +0x23a
github.com/NebulousLabs/Sia/modules/host/contractmanager.(*writeAheadLog).load(0xc4203ae308, 0x0, 0x0)
    /home/luke/go/src/github.com/NebulousLabs/Sia/modules/host/contractmanager/writeaheadlog.go:259 +0x43
github.com/NebulousLabs/Sia/modules/host/contractmanager.newContractManager(0xde2a20, 0xc4203880e0, 0xc4203b55c0, 0x35, 0x0, 0x0, 0x0)
    /home/luke/go/src/github.com/NebulousLabs/Sia/modules/host/contractmanager/contractmanager.go:163 +0x4ed
github.com/NebulousLabs/Sia/modules/host/contractmanager.New(0xc4203b55c0, 0x35, 0x2, 0xc4203b55c0, 0x35)
    /home/luke/go/src/github.com/NebulousLabs/Sia/modules/host/contractmanager/contractmanager.go:226 +0x5b
github.com/NebulousLabs/Sia/modules/host.newHost(0xde2ba0, 0xf05908, 0xde35c0, 0xc420149b80, 0xde27a0, 0xc4203846e0, 0xde5e80, 0xc4203849a0, 0x7fff0febbbda, 0x5, ...)
    /home/luke/go/src/github.com/NebulousLabs/Sia/modules/host/host.go:262 +0x4a5
github.com/NebulousLabs/Sia/modules/host.New(0xde35c0, 0xc420149b80, 0xde27a0, 0xc4203846e0, 0xde5e80, 0xc4203849a0, 0x7fff0febbbda, 0x5, 0xc420166540, 0x25, ...)
    /home/luke/go/src/github.com/NebulousLabs/Sia/modules/host/host.go:298 +0xd8
main.startDaemon(0x0, 0x0, 0x7fff0febbbbf, 0xe, 0x7fff0febbbeb, 0x5, 0x7fff0febbbda, 0x5, 0x0, 0x7fff0febbc2c, ...)
    /home/luke/go/src/github.com/NebulousLabs/Sia/siad/daemon.go:250 +0xf3c
main.startDaemonCmd(0xc42008efc0, 0xc42005d1d0, 0x0, 0x5)
    /home/luke/go/src/github.com/NebulousLabs/Sia/siad/daemon.go:335 +0x162
github.com/spf13/cobra.(*Command).execute(0xc42008efc0, 0xc4200100d0, 0x5, 0x5, 0xc42008efc0, 0xc4200100d0)
    /home/luke/go/src/github.com/spf13/cobra/command.go:653 +0x299
github.com/spf13/cobra.(*Command).ExecuteC(0xc42008efc0, 0xaf832c, 0x3b, 0xc420158b40)
    /home/luke/go/src/github.com/spf13/cobra/command.go:728 +0x339
github.com/spf13/cobra.(*Command).Execute(0xc42008efc0, 0xee9020, 0xae0d0e)
    /home/luke/go/src/github.com/spf13/cobra/command.go:687 +0x2b
main.main()
    /home/luke/go/src/github.com/NebulousLabs/Sia/siad/main.go:174 +0x7aa
NebulousLabs / Sia

Sia still crashes on initial sync (since months) #2505
