Panic serving: invalid node type

[Basyuk]

Environment info:

• KrakenD version: Version: 2.10.0
• System info: docker
• Hardware specs: 8 CPU, 16 RAM
• Backend technology: PHP, Java
• Additional environment information:

Describe the bug
I periodically receive an error when working with the API gateway. The error appears randomly. When an error occurs, Krakend stops responding to requests, but the Krakend container itself does not crash.

Commands used
docker compose up -d

Logs
2025/05/28 03:46:29 http: panic serving 172.18.0.5:52896: invalid node type
goroutine 17014263 [running]:
net/http.(*conn).serve.func1()
/usr/local/go/src/net/http/server.go:1947 +0xbe
panic({0x31bf600?, 0x3cd2ca0?})
/usr/local/go/src/runtime/panic.go:792 +0x132
github.com/gin-gonic/gin.(*node).findCaseInsensitivePathRec(0x200000003?, {0xc001644a97?, 0x0?}, {0xc000821980?, 0xc00006ca08?, 0x1254609?}, {0x6f, 0x0, 0x0, 0x0}, ...)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:862 +0xa71
github.com/gin-gonic/gin.(*node).findCaseInsensitivePathRec(0x10?, {0xc001644a94?, 0xc00108f578?}, {0xc000821980?, 0xc001038f00?, 0xc00108f610?}, {0x6f, 0x0, 0x0, 0x0}, ...)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:778 +0x479
github.com/gin-gonic/gin.(*node).findCaseInsensitivePathRec(0x120840e?, {0xc001644a8c?, 0x0?}, {0xc000821980?, 0xffffffffffffffff?, 0x133fbd6?}, {0x76, 0x0, 0x0, 0x0}, ...)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:778 +0x479
github.com/gin-gonic/gin.(*node).findCaseInsensitivePathRec(0x3503140?, {0xc001644a8b?, 0x0?}, {0xc000821980?, 0x127abbe?, 0x280?}, {0x68, 0x0, 0x0, 0x0}, ...)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:778 +0x479
github.com/gin-gonic/gin.(*node).findCaseInsensitivePathRec(0xc00108f8d0?, {0xc001644a85?, 0x1214fdb?}, {0xc000821980?, 0x0?, 0x4?}, {0x63, 0x0, 0x0, 0x0}, ...)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:778 +0x479
github.com/gin-gonic/gin.(*node).findCaseInsensitivePathRec(0xc002255620?, {0xc001644a84?, 0xc00108f7f0?}, {0xc000821980?, 0x80?, 0xc001644aaf?}, {0x65, 0x0, 0x0, 0x0}, ...)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:778 +0x479
github.com/gin-gonic/gin.(*node).findCaseInsensitivePath(0xc0009b95e0, {0xc001644a84, 0x31}, 0x1)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:669 +0x96
github.com/gin-gonic/gin.redirectFixedPath(0xc000c84e00, 0xc0009b95e0, 0x1)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/gin.go:691 +0x4f
github.com/gin-gonic/gin.(*Engine).handleHTTPRequest(0xc00099b520, 0xc000c84e00)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/gin.go:629 +0x395
github.com/gin-gonic/gin.(*Engine).ServeHTTP(0xc00099b520, {0x3d00f30, 0xc0039159a0}, 0xc001e81900)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/gin.go:576 +0x1aa
github.com/rs/cors.(*Cors).Handler.func1({0x3d00f30, 0xc0039159a0}, 0xc001e81900)
/go/pkg/mod/github.com/rs/cors@v1.11.0/cors.go:289 +0x1ba
net/http.HandlerFunc.ServeHTTP(0xc000f3e690?, {0x3d00f30?, 0xc0039159a0?}, 0x3cd3f00?)
/usr/local/go/src/net/http/server.go:2294 +0x29
github.com/krakend/krakend-otel/http/server.(*trackingHandler).ServeHTTP(0xc000f051d0, {0x3d00968, 0xc001714a80}, 0xc001e81680)
/go/pkg/mod/github.com/krakend/krakend-otel@v0.10.2/http/server/server.go:53 +0x496
net/http.serverHandler.ServeHTTP({0xc00154cb10?}, {0x3d00968?, 0xc001714a80?}, 0x6?)
/usr/local/go/src/net/http/server.go:3301 +0x8e
net/http.(*conn).serve(0xc000755a70, {0x3d04910, 0xc000f3e7e0})
/usr/local/go/src/net/http/server.go:2102 +0x625
created by net/http.(*Server).Serve in goroutine 82
/usr/local/go/src/net/http/server.go:3454 +0x485

2025/05/28 03:46:38 http: panic serving 172.18.0.5:41738: invalid node type
goroutine 17015402 [running]:
net/http.(*conn).serve.func1()
/usr/local/go/src/net/http/server.go:1947 +0xbe
panic({0x31bf600?, 0x3cd2ca0?})
/usr/local/go/src/runtime/panic.go:792 +0x132
github.com/gin-gonic/gin.(*node).findCaseInsensitivePathRec(0x200000003?, {0xc001688737?, 0x0?}, {0xc00132d280?, 0xc000073908?, 0x1254609?}, {0x6f, 0x0, 0x0, 0x0}, ...)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:862 +0xa71
github.com/gin-gonic/gin.(*node).findCaseInsensitivePathRec(0x7?, {0xc001688734?, 0xc003d3a578?}, {0xc00132d280?, 0xc001869e00?, 0xc003d3a610?}, {0x6f, 0x0, 0x0, 0x0}, ...)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:778 +0x479
github.com/gin-gonic/gin.(*node).findCaseInsensitivePathRec(0x120840e?, {0xc00168872c?, 0x0?}, {0xc00132d280?, 0xffffffffffffffff?, 0x133fbd6?}, {0x76, 0x0, 0x0, 0x0}, ...)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:778 +0x479
github.com/gin-gonic/gin.(*node).findCaseInsensitivePathRec(0x3503140?, {0xc00168872b?, 0x0?}, {0xc00132d280?, 0x127abbe?, 0x280?}, {0x68, 0x0, 0x0, 0x0}, ...)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:778 +0x479
github.com/gin-gonic/gin.(*node).findCaseInsensitivePathRec(0xc003d3a8d0?, {0xc001688725?, 0x1214fdb?}, {0xc00132d280?, 0x0?, 0x4?}, {0x63, 0x0, 0x0, 0x0}, ...)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:778 +0x479
github.com/gin-gonic/gin.(*node).findCaseInsensitivePathRec(0xc000e321f8?, {0xc001688724?, 0xc003d3a7f0?}, {0xc00132d280?, 0x80?, 0xc00168874f?}, {0x65, 0x0, 0x0, 0x0}, ...)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:778 +0x479
github.com/gin-gonic/gin.(*node).findCaseInsensitivePath(0xc0009b95e0, {0xc001688724, 0x31}, 0x1)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/tree.go:669 +0x96
github.com/gin-gonic/gin.redirectFixedPath(0xc002322400, 0xc0009b95e0, 0x1)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/gin.go:691 +0x4f
github.com/gin-gonic/gin.(*Engine).handleHTTPRequest(0xc00099b520, 0xc002322400)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/gin.go:629 +0x395
github.com/gin-gonic/gin.(*Engine).ServeHTTP(0xc00099b520, {0x3d00f30, 0xc00198dcc0}, 0xc003468780)
/go/pkg/mod/github.com/gin-gonic/gin@v1.9.1/gin.go:576 +0x1aa
github.com/rs/cors.(*Cors).Handler.func1({0x3d00f30, 0xc00198dcc0}, 0xc003468780)
/go/pkg/mod/github.com/rs/cors@v1.11.0/cors.go:289 +0x1ba
net/http.HandlerFunc.ServeHTTP(0xc000f3e690?, {0x3d00f30?, 0xc00198dcc0?}, 0x3cd3f00?)
/usr/local/go/src/net/http/server.go:2294 +0x29
github.com/krakend/krakend-otel/http/server.(*trackingHandler).ServeHTTP(0xc000f051d0, {0x3d00968, 0xc0013af340}, 0xc003468500)
/go/pkg/mod/github.com/krakend/krakend-otel@v0.10.2/http/server/server.go:53 +0x496
net/http.serverHandler.ServeHTTP({0xc003900c30?}, {0x3d00968?, 0xc0013af340?}, 0x6?)
/usr/local/go/src/net/http/server.go:3301 +0x8e
net/http.(*conn).serve(0xc0033d9710, {0x3d04910, 0xc000f3e7e0})
/usr/local/go/src/net/http/server.go:2102 +0x625
created by net/http.(*Server).Serve in goroutine 82
/usr/local/go/src/net/http/server.go:3454 +0x485

[thedae]

Hi @Basyuk , this looks like a problem with endpoint routes, could you share your configuration file?