runtime error: slice bounds out of range in packets.go #36

timnash · 2013-03-05T23:35:34Z

Trying to ApacheBench test a basic page created with Go, and I get this error:

2013/03/05 23:27:03 http: panic serving ipaddress:58369: runtime error: slice bounds out of range
/usr/local/go/src/pkg/net/http/server.go:589 (0x43eb1b)
        _func_004: buf.Write(debug.Stack())
/usr/local/go/src/pkg/runtime/proc.c:1443 (0x410aab)
        panic: reflectÂ·call(d->fn, d->args, d->siz);
/usr/local/go/src/pkg/runtime/runtime.c:128 (0x411577)
        panicstring: runtimeÂ·panic(err);
/usr/local/go/src/pkg/runtime/runtime.c:91 (0x411448)
        panicslice: runtimeÂ·panicstring("slice bounds out of range");
/usr/local/go/src/pkg/github.com/Go-SQL-Driver/MySQL/packets.go:133 (0x44b2a6)
        com/Go-SQL-Driver/MySQL.(*mysqlConn).readInitPacket: mc.cipher = append(mc.cipher, data[pos:pos+12]...)
/usr/local/go/src/pkg/github.com/Go-SQL-Driver/MySQL/driver.go:46 (0x44a38a)
        com/Go-SQL-Driver/MySQL.(*mysqlDriver).Open: err = mc.readInitPacket()
/usr/local/go/src/pkg/database/sql/sql.go:248 (0x4435bd)
        (*DB).conn: return db.driver.Open(db.dsn)
/usr/local/go/src/pkg/database/sql/sql.go:310 (0x443b10)
        (*DB).prepare: ci, err := db.conn()
/usr/local/go/src/pkg/database/sql/sql.go:295 (0x443a33)
        (*DB).Prepare: stmt, err = db.prepare(query)
/usr/local/go/src/pkg/database/sql/sql.go:380 (0x444493)
        (*DB).Query: stmt, err := db.Prepare(query)
/myfolder/test.go:13 (0x400cd0)
        wwwHandler: result, e := db.Query("SELECT * FROM s WHERE sid=?",sid)
/myfolder/test.go:35 (0x401406)
        _func_001: wwwHandler(w, r, db)
/usr/local/go/src/pkg/net/http/server.go:703 (0x432964)
        HandlerFunc.ServeHTTP: f(w, r)
/usr/local/go/src/pkg/net/http/server.go:941 (0x4337b8)
        (*ServeMux).ServeHTTP: mux.handler(r).ServeHTTP(w, r)
/usr/local/go/src/pkg/net/http/server.go:669 (0x432777)
        (*conn).serve: handler.ServeHTTP(w, w.req)
/usr/local/go/src/pkg/runtime/proc.c:271 (0x40ebb1)
        goexit: runtimeÂ·goexit(void)

Here's my code:

package main

import (
    "fmt"
    "net/http"
    "database/sql"
    _ "github.com/Go-SQL-Driver/MySQL"
)

func wwwHandler(w http.ResponseWriter, r *http.Request, db *sql.DB) {
    for i := 0; i < 10; i++ {
        sid := 1
        result, e := db.Query("SELECT * FROM s WHERE sid=?",sid)
        if e != nil {
            panic(e.Error())
        }
        result.Next()
        var resultsid, created, posted, title, above_the_fold, below_the_fold sql.NullString
        var draft_or_final bool
        err := result.Scan(&resultsid,&created,&posted,&title,&above_the_fold,&below_the_fold,&draft_or_final)
        if err != nil {
            panic(err.Error())
        }
        fmt.Fprintf(w, "%s%s%s%s%s",resultsid.String,created.String,title.String,above_the_fold.String,below_the_fold.String)   
    }
}

func main() {
    db, e := sql.Open("mysql", "username:password@/dbname")
    if e != nil {
        panic(e.Error())
    }   
    defer db.Close()
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        wwwHandler(w, r, db)
    })  
    http.ListenAndServe(":80",nil)  
}

The text was updated successfully, but these errors were encountered:

julienschmidt · 2013-03-06T02:09:12Z

Which MySQL server version are you using?
This seems to be highly related to the fix for Issue #35

timnash · 2013-03-06T02:11:01Z

mysql Ver 14.14 Distrib 5.5.29, for debian-linux-gnu (x86_64) using readline 6.2

julienschmidt · 2013-03-06T02:26:46Z

Can you reproduce the error?

If yes, can you please add fmt.Println(len(data)-pos, data[pos-11]) to packets.go:134 and post the output?

julienschmidt · 2013-03-06T02:29:49Z

Sorry, place it before line 133 please. Otherwise it will panic before the line is reached.

timnash · 2013-03-06T02:49:41Z

2013/03/06 02:48:01 http: panic serving ipaddress:39134: runtime error: slice bounds out of range
/usr/local/go/src/pkg/net/http/server.go:589 (0x43ea74)
        _func_004: buf.Write(debug.Stack())
/usr/local/go/src/pkg/runtime/proc.c:1443 (0x410a04)
        panic: reflectÂ·call(d->fn, d->args, d->siz);
/usr/local/go/src/pkg/runtime/runtime.c:128 (0x4114d0)
        panicstring: runtimeÂ·panic(err);
/usr/local/go/src/pkg/runtime/runtime.c:91 (0x4113a1)
        panicslice: runtimeÂ·panicstring("slice bounds out of range");
/usr/local/go/src/pkg/github.com/Go-SQL-Driver/MySQL/packets.go:133 (0x44b1ff)
        com/Go-SQL-Driver/MySQL.(*mysqlConn).readInitPacket: fmt.Println(len(data)-pos, data[pos-11])
/usr/local/go/src/pkg/github.com/Go-SQL-Driver/MySQL/driver.go:46 (0x44a2e3)
        com/Go-SQL-Driver/MySQL.(*mysqlDriver).Open: err = mc.readInitPacket()
/usr/local/go/src/pkg/database/sql/sql.go:248 (0x443516)
        (*DB).conn: return db.driver.Open(db.dsn)
/usr/local/go/src/pkg/database/sql/sql.go:310 (0x443a69)
        (*DB).prepare: ci, err := db.conn()
/usr/local/go/src/pkg/database/sql/sql.go:295 (0x44398c)
        (*DB).Prepare: stmt, err = db.prepare(query)
/usr/local/go/src/pkg/database/sql/sql.go:380 (0x4443ec)
        (*DB).Query: stmt, err := db.Prepare(query)
/myfolder/test.go:13 (0x400cd0)
        wwwHandler: result, e := db.Query("SELECT * FROM s WHERE sid=?",sid)
/myfolder/test.go:35 (0x40135f)
        _func_001: wwwHandler(w, r, db)
/usr/local/go/src/pkg/net/http/server.go:703 (0x4328bd)
        HandlerFunc.ServeHTTP: f(w, r)
/usr/local/go/src/pkg/net/http/server.go:941 (0x433711)
        (*ServeMux).ServeHTTP: mux.handler(r).ServeHTTP(w, r)
/usr/local/go/src/pkg/net/http/server.go:669 (0x4326d0)
        (*conn).serve: handler.ServeHTTP(w, w.req)
/usr/local/go/src/pkg/runtime/proc.c:271 (0x40eb0a)
        goexit: runtimeÂ·goexit(void)

timnash · 2013-03-06T02:51:39Z

It only happens with multiple concurrent connections. Before it couldn't handle more than one, but now it handled up to 5 before it panicked. The previous output was from

ab -n 100 -c 10

julienschmidt · 2013-03-06T02:56:22Z

Okay... this time fmt.Println(pos, len(data)) at line 121 ( before if len(data) > pos {) please.
Otherwise I'm running out of ideas what could cause this...

julienschmidt · 2013-03-06T02:57:39Z

Or even better: fmt.Println(pos, len(data), data[pos:])

timnash · 2013-03-06T03:01:10Z

2013/03/06 02:59:20 http: panic serving ipaddress:41704: runtime error: slice bounds out of range
/usr/local/go/src/pkg/net/http/server.go:589 (0x43ea74)
        _func_004: buf.Write(debug.Stack())
/usr/local/go/src/pkg/runtime/proc.c:1443 (0x410a04)
        panic: reflectÂ·call(d->fn, d->args, d->siz);
/usr/local/go/src/pkg/runtime/runtime.c:128 (0x4114d0)
        panicstring: runtimeÂ·panic(err);
/usr/local/go/src/pkg/runtime/runtime.c:91 (0x4113a1)
        panicslice: runtimeÂ·panicstring("slice bounds out of range");
/usr/local/go/src/pkg/github.com/Go-SQL-Driver/MySQL/packets.go:133 (0x44b1ff)
        com/Go-SQL-Driver/MySQL.(*mysqlConn).readInitPacket: // which is not documented but seems to work.
/usr/local/go/src/pkg/github.com/Go-SQL-Driver/MySQL/driver.go:46 (0x44a2e3)
        com/Go-SQL-Driver/MySQL.(*mysqlDriver).Open: err = mc.readInitPacket()
/usr/local/go/src/pkg/database/sql/sql.go:248 (0x443516)
        (*DB).conn: return db.driver.Open(db.dsn)
/usr/local/go/src/pkg/database/sql/sql.go:310 (0x443a69)
        (*DB).prepare: ci, err := db.conn()
/usr/local/go/src/pkg/database/sql/sql.go:295 (0x44398c)
        (*DB).Prepare: stmt, err = db.prepare(query)
/usr/local/go/src/pkg/database/sql/sql.go:380 (0x4443ec)
        (*DB).Query: stmt, err := db.Prepare(query)
/myfolder/test.go:13 (0x400cd0)
        wwwHandler: result, e := db.Query("SELECT * FROM s WHERE sid=?",sid)
/myfolder/test.go:35 (0x40135f)
        _func_001: wwwHandler(w, r, db)
/usr/local/go/src/pkg/net/http/server.go:703 (0x4328bd)
        HandlerFunc.ServeHTTP: f(w, r)
/usr/local/go/src/pkg/net/http/server.go:941 (0x433711)
        (*ServeMux).ServeHTTP: mux.handler(r).ServeHTTP(w, r)
/usr/local/go/src/pkg/net/http/server.go:669 (0x4326d0)
        (*conn).serve: handler.ServeHTTP(w, w.req)
/usr/local/go/src/pkg/runtime/proc.c:271 (0x40eb0a)
        goexit: runtimeÂ·goexit(void)

julienschmidt · 2013-03-06T03:10:31Z

Huh? This trace says it panicked on a comment.
I guess that actually the precompiled package is executed. Please delete the Go-SQL-Driver folder which should be located in your $GOROOT/pkg/linux_amd64/github.com/.
Then run this again. This should give a lot output in your stdout / log.

timnash · 2013-03-06T03:15:49Z

Heh. Sorry, still new to Go. I used "go build", thought that would recompile.

Here's the new output (it's repeating because of the concurrent requests, not sure where one ends and another begins):


35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 91 62 98 81 80 126 72 47 78 123 68 126 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 36 99 73 33 104 108 99 44 77 36 103 93 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 52 72 77 42 42 51 98 114 56 95 88 119 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 99 103 89 107 45 58 125 43 87 86 41 104 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 116 114 95 102 99 60 67 123 98 89 118 105 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 86 126 57 64 115 69 61 65 109 38 113 42 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 121 56 70 56 39 88 104 34 107 118 50 52 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 59 116 87 56 80 106 70 94 39 69 100 72 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 87 91 71 46 82 48 58 111 67 62 79 81 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 87 117 103 38 35 123 100 98 64 86 112 83 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 67 104 98 50 115 107 66 71 124 92 57 68 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
35 21
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 62 117 85 43 113 122 52 48 52 83 38 97 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 37 48 94 107 124 81 96 107 122 66 123 101 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 34 91 39 75 37 118 71 61 60 84 114 97 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 34 66 101 88 105 41 44 67 73 41 44 67 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 96 69 116 61 110 55 101 118 68 48 97 119 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 40 107 102 61 62 93 61 86 120 123 35 56 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 126 101 91 121 110 60 33 46 98 38 50 105 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 118 110 69 76 49 77 112 108 78 33 88 118 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 53 51 64 43 82 60 115 81 124 60 86 121 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 78 98 36 41 65 76 58 123 35 54 38 91 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 119 95 87 118 105 48 79 123 66 116 68 54 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 76 43 51 91 81 101 43 67 78 61 40 79 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 57 48 37 103 90 108 47 70 81 68 64 83 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 120 39 83 79 114 113 95 106 116 42 112 118 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 47 45 52 94 93 56 64 119 88 53 60 107 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 45 85 70 61 63 99 84 93 86 117 109 65 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 50 112 93 98 86 101 119 75 78 37 106 106 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 73 64 67 113 50 65 50 117 121 126 47 108 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 83 33 72 41 51 100 33 115 69 58 52 55 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 96 66 101 87 100 111 36 96 59 68 34 124 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 90 76 78 35 97 65 95 61 82 99 124 103 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 86 79 105 65 75 52 99 115 61 113 70 70 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 83 56 90 62 103 108 105 75 121 66 123 100 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 110 44 46 67 71 121 79 91 91 56 67 43 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 65 112 49 63 40 76 39 121 80 98 123 103 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 71 49 93 96 76 60 40 82 68 63 79 77 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 56 40 92 121 109 56 107 51 91 79 93 99 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 121 104 122 80 94 104 111 116 120 125 46 102 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 107 74 113 120 43 102 66 85 103 39 43 63 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 42 64 66 107 116 38 91 122 116 86 49 51 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 40 109 107 84 68 53 123 48 119 45 115 125 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 98 36 44 80 47 54 100 115 55 86 43 113 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 68 90 118 101 116 56 89 58 84 118 117 107 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 36 58 56 72 67 86 100 118 71 60 54 60 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 51 97 111 46 50 82 40 108 106 77 38 114 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 97 106 112 115 114 98 117 70 61 60 85 121 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 89 68 40 55 125 52 41 110 110 97 119 86 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 76 100 52 115 105 55 114 92 86 120 120 114 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 52 90 75 72 104 81 63 37 58 53 58 99 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 54 81 119 36 74 42 48 81 41 117 55 78 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 66 79 71 83 78 108 85 68 53 121 38 76 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 42 75 121 66 123 101 103 85 83 35 83 87 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 115 50 61 122 113 70 76 40 36 120 83 117 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 83 41 110 114 111 86 66 37 52 113 96 110 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 47 73 95 38 60 61 92 54 58 95 79 78 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 45 89 90 54 62 116 79 108 83 58 103 120 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 108 50 81 36 91 33 48 110 91 90 52 53 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 118 90 66 119 82 116 113 93 90 47 120 50 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 35 76 57 116 95 95 62 88 34 62 81 93 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 100 57 45 116 38 90 117 94 88 125 47 110 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 92 91 50 39 107 102 64 77 66 66 99 77 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 68 35 123 101 105 96 39 63 72 45 68 78 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 43 103 73 117 50 54 88 56 79 102 51 104 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 98 40 63 69 124 96 77 63 51 34 79 74 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 82 98 118 76 85 73 78 44 46 68 76 47 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 93 108 43 43 57 123 35 55 46 124 75 64 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 38 105 97 45 88 83 119 125 47 111 97 121 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 113 103 52 105 55 113 89 73 63 65 105 107 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 115 35 79 68 73 33 104 103 77 45 53 100 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 43 45 61 46 108 87 77 93 106 126 90 41 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 72 97 48 104 61 57 69 45 82 54 84 39 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 91 114 79 114 111 85 62 118 87 50 51 72 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 77 122 66 117 74 79 47 62 40 77 45 56 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 37 112 38 104 92 115 77 103 64 72 40 45 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 82 51 69 64 83 95 98 80 74 96 37 55 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21
40 91 [8 2 0 15 128 21 0 0 0 0 0 0 0 0 0 0 61 55 60 101 106 100 54 34 66 105 106 88 0 109 121 115 113 108 95 110 97 116 105 118 101 95 112 97 115 115 119 111 114 100 0]
35 21

Fixes issue #36

julienschmidt · 2013-03-06T04:39:10Z

Okay I found the reason. Delete the current source and run go get github.com/Go-SQL-Driver/MySQL.

But I bet the result doesn't make you happy 😕

timnash · 2013-03-06T04:47:37Z

Now I get

2013/03/06 04:44:28 http: panic serving ipaddress:43688: runtime error: invalid memory address or nil pointer dereference
/usr/local/go/src/pkg/net/http/server.go:589 (0x43ea74)
        _func_004: buf.Write(debug.Stack())
/usr/local/go/src/pkg/runtime/proc.c:1443 (0x410a04)
        panic: reflectÂ·call(d->fn, d->args, d->siz);
/usr/local/go/src/pkg/runtime/runtime.c:128 (0x4114d0)
        panicstring: runtimeÂ·panic(err);
/usr/local/go/src/pkg/runtime/thread_linux.c:199 (0x414322)
        sigpanic: runtimeÂ·panicstring("invalid memory address or nil pointer dereference");
/usr/local/go/src/pkg/database/sql/sql.go:911 (0x4473fc)
        (*Rows).Next: if rs.closed {
/myfolder/test.go:17 (0x400d10)
        wwwHandler: result.Next()
/myfolder/test.go:35 (0x40135f)
        _func_001: wwwHandler(w, r, db)
/usr/local/go/src/pkg/net/http/server.go:703 (0x4328bd)
        HandlerFunc.ServeHTTP: f(w, r)
/usr/local/go/src/pkg/net/http/server.go:941 (0x433711)
        (*ServeMux).ServeHTTP: mux.handler(r).ServeHTTP(w, r)
/usr/local/go/src/pkg/net/http/server.go:669 (0x4326d0)
        (*conn).serve: handler.ServeHTTP(w, w.req)
/usr/local/go/src/pkg/runtime/proc.c:271 (0x40eb0a)
        goexit: runtimeÂ·goexit(void)

An bug in the database/sql package?

julienschmidt · 2013-03-06T04:55:56Z

this is the reason for the panic -> result.Next(). result is nil I guess
db.Query(...) should have returned an error.

One other thing:
Use either a for loop (for rows.Next() { ... }) or something like this:

if rows.Next() {
     // whatever
} else {
     // catch error with rows.Err()
}
rows.Close() // <- don't forget this if you are not iterating over ALL results

timnash · 2013-03-06T04:59:52Z

Thanks for the help!

julienschmidt · 2013-03-06T05:00:22Z

No panics anymore?

timnash · 2013-03-06T05:06:57Z

Now I'm getting panics from the http server, but everything seems great with SQL.

julienschmidt · 2013-03-06T05:08:51Z

Just comment on this issue if there are further problems

julienschmidt added a commit that referenced this issue Mar 6, 2013

catch handshake errors

e6e2205

Fixes issue #36

ghost assigned julienschmidt Mar 6, 2013

julienschmidt closed this as completed Mar 6, 2013

gm42 mentioned this issue May 9, 2017

runtime error: slice bounds out of range in packets.go #587

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runtime error: slice bounds out of range in packets.go #36

runtime error: slice bounds out of range in packets.go #36

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runtime error: slice bounds out of range in packets.go #36

runtime error: slice bounds out of range in packets.go #36

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