That isn't an http2 panic. That's just the http2 code recovering your
Handler's panic and printing it, the same as the http1 server does.
Your panic is actually somewhere in:
lib.setupC5Tab(0x7f6fbe169d20, 0xc8201b0d20, 0xc820436d98, 0x7f6fbe169d20,
0xc8201b0dc0, 0x7f6fbe16a2a8, 0xc820339e60, 0x7f6fbe16a5f8, 0xc8201b0e60,
0xc82047be20)
/home/sysop/go/src/lib/rhewocompstatus.go:1310 +0x3976
lib.BuildRhewoStatus.func4(0x7f6fbe117538, 0xc8205bc300)
/home/sysop/go/src/lib/rhewocompstatus.go:168 +0xc8
github.com/icza/gowut/gwu.handlerFuncWrapper.HandleEvent(0xc82040b5c0,
0x7f6fbe117538, 0xc8205bc300)
/home/sysop/go/src/github.com/icza/gowut/gwu/event.go:441 +0x3e
github.com/icza/gowut/gwu.(*compImpl).dispatchEvent(0xc820158770,
0x7f6fbe117538, 0xc8205bc300)
/home/sysop/go/src/github.com/icza/gowut/gwu/comp.go:307 +0x167
github.com/icza/gowut/gwu.(*timerImpl).dispatchEvent(0xc820158770,
0x7f6fbe117538, 0xc8205bc300)
<autogenerated>:1302 +0x60
github.com/icza/gowut/gwu.(*serverImpl).handleEvent(0xc82019e900,
0x7f6fbe1172c0, 0xc8202fa7e0, 0x7f6fbe169998, 0xc8202b4ff0, 0x7f6fbe117170,
0xc82007c2a0, 0xc820148460)
/home/sysop/go/src/github.com/icza/gowut/gwu/server.go:815 +0x103e
github.com/icza/gowut/gwu.(*serverImpl).serveHTTP(0xc82019e900,
0x7f6fbe117170, 0xc82007c2a0, 0xc820148460)
/home/sysop/go/src/github.com/icza/gowut/gwu/server.go:683 +0x1544
github.com/icza/gowut/gwu.(*serverImpl).Start.func1(0x7f6fbe117170,
0xc82007c2a0, 0xc820148460)
/home/sysop/go/src/github.com/icza/gowut/gwu/server.go:483 +0x4c
On Thu, Oct 6, 2016 at 3:29 AM, Nigel Vickers <rhed...@gmail.com> wrote:
> We are migrating an application from go 1.4.1 to 1.6.2. The application
> uses a modified Gowut 0.9 as the framework and initially moved without
> issue. The application server runs behind a tls sni
> proxy/loadbalancer(slt). While running slt at 1.4.1 and the server at 1.6.2
> no problems were encountered. We assume because 1.4.1 couldn’t http2. After
> moving the slt to 1.6.2 we are experiencing runtime panics with
> http2(protocol attached). Two questions:
>
> Is the statement that http2 should just run still applicable?
> And
> Are use cases that fail still of interest as issues?
>
> We have a “provisional trigger” . A client xmlHttpRequest triggered by an
> attached javascript timer requests a component update and reload from the
> server. Currently at 10 second intervals.
> Irregularly, between the 90th and 99th request the server panics.
>
> We are bit stuck because we have no experience with http2. Any suggestions
> on how to proceed would be welcome.
>
> Nigel Vickers
>
>
> Rhewo Dev2016/10/05 14:14:24 serveHTTP Incoming: request Path
> /mainAppWin/e
> Rhewo Dev2016/10/05 14:14:24 serveHTTP Incoming: request Body
> &{0xc8205ba120 0xc8200f5180 false 0xc8204e8d00 false}
> SessionDump &{LUP_NiaDLsjBFLOpsSUKLa false {63611263456 268951715
> 0xf36ee0} {63611266464 12850383 0xf36ee0} map[mainAppWin:0xc8202b4ff0]
> map[groups:[free admin] module:Status Lang:de hiddenPan:0xc820476000
> ips:xx.xx.xx.xx user:fred2 auth:auth] 14400000000000 0xc820303f20}
> Rhewo Dev2016/10/05 14:14:24 serveHTTP appName Parts 3 [ mainAppWin e]
> Rhewo Dev2016/10/05 14:14:24 Event from comp: 932 event: 15
> 2016/10/05 14:14:24 http2: panic serving xxx.xxx.xxx.xxx:49337: runtime
> error: index out of range
> goroutine 2962 [running]:
> net/http.(*http2serverConn).runHandler.func1(0xc82053df3f, 0xc8200f5180,
> 0xc82007c2a0)
> /usr/local/go/src/net/http/h2_bundle.go:4050 +0xde
> panic(0xb24060, 0xc82000e0d0)
> /usr/local/go/src/runtime/panic.go:443 +0x521
> lib.setupC5Tab(0x7f6fbe169d20, 0xc8201b0d20, 0xc820436d98, 0x7f6fbe169d20,
> 0xc8201b0dc0, 0x7f6fbe16a2a8, 0xc820339e60, 0x7f6fbe16a5f8, 0xc8201b0e60,
> 0xc82047be20)
> /home/sysop/go/src/lib/rhewocompstatus.go:1310 +0x3976
> lib.BuildRhewoStatus.func4(0x7f6fbe117538, 0xc8205bc300)
> /home/sysop/go/src/lib/rhewocompstatus.go:168 +0xc8
> github.com/icza/gowut/gwu.handlerFuncWrapper.HandleEvent(0xc82040b5c0,
> 0x7f6fbe117538, 0xc8205bc300)
> /home/sysop/go/src/github.com/icza/gowut/gwu/event.go:441 +0x3e
> github.com/icza/gowut/gwu.(*compImpl).dispatchEvent(0xc820158770,
> 0x7f6fbe117538, 0xc8205bc300)
> /home/sysop/go/src/github.com/icza/gowut/gwu/comp.go:307 +0x167
> github.com/icza/gowut/gwu.(*timerImpl).dispatchEvent(0xc820158770,
> 0x7f6fbe117538, 0xc8205bc300)
> <autogenerated>:1302 +0x60
> github.com/icza/gowut/gwu.(*serverImpl).handleEvent(0xc82019e900,
> 0x7f6fbe1172c0, 0xc8202fa7e0, 0x7f6fbe169998, 0xc8202b4ff0, 0x7f6fbe117170,
> 0xc82007c2a0, 0xc820148460)
> /home/sysop/go/src/github.com/icza/gowut/gwu/server.go:815 +0x103e
> github.com/icza/gowut/gwu.(*serverImpl).serveHTTP(0xc82019e900,
> 0x7f6fbe117170, 0xc82007c2a0, 0xc820148460)
> /home/sysop/go/src/github.com/icza/gowut/gwu/server.go:683 +0x1544
> github.com/icza/gowut/gwu.(*serverImpl).Start.func1(0x7f6fbe117170,
> 0xc82007c2a0, 0xc820148460)
> /home/sysop/go/src/github.com/icza/gowut/gwu/server.go:483 +0x4c
> net/http.HandlerFunc.ServeHTTP(0xc82006d450, 0x7f6fbe117170,
> 0xc82007c2a0, 0xc820148460)
> /usr/local/go/src/net/http/server.go:1618 +0x48
> net/http.(*ServeMux).ServeHTTP(0xc820070b10, 0x7f6fbe117170,
> 0xc82007c2a0, 0xc820148460)
> /usr/local/go/src/net/http/server.go:1910 +0x213
> net/http.serverHandler.ServeHTTP(0xc8200e4200, 0x7f6fbe117170,
> 0xc82007c2a0, 0xc820148460)
> /usr/local/go/src/net/http/server.go:2081 +0x207
> net/http.initNPNRequest.ServeHTTP(0xc8201d4300, 0xc8200e4200,
> 0x7f6fbe117170, 0xc82007c2a0, 0xc820148460)
> /usr/local/go/src/net/http/server.go:2489 +0x351
> net/http.(*initNPNRequest).ServeHTTP(0xc8201d8b20, 0x7f6fbe117170,
> 0xc82007c2a0, 0xc820148460)
> <autogenerated>:253 +0xdb
> net/http.(Handler).ServeHTTP-fm(0x7f6fbe117170, 0xc82007c2a0, 0xc820
> /usr/local/go/src/net/http/h2_bundle.go:3847 +0x5e
> net/http.(*http2serverConn).runHandler(0xc8200f5180, 0xc82007c2a0, 0
> /usr/local/go/src/net/http/h2_bundle.go:4060 +0xad
> created by net/http.(*http2serverConn).processHeaderBlockFragment
> /usr/local/go/src/net/http/h2_bundle.go:3853 +0x7c3
>
> --
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