bigcache
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allegro
minimal reproducible example for "index out of range [7] with length 0"
2022/02/11 18:13:58 Allocated new queue in 913.9µs; Capacity: 4680000
2022/02/11 18:13:59 Allocated new queue in 10.4696ms; Capacity: 18720000
2022/02/11 18:13:59 Allocated new queue in 9.8986ms; Capacity: 18720000
panic: runtime error: index out of range [7] with length 0
goroutine 479 [running]:
encoding/binary.littleEndian.Uint64(...)
c:/go/src/encoding/binary/binary.go:77
github.com/allegro/bigcache/v3.readTimestampFromEntry(...)
d:/mygo/pkg/mod/github.com/allegro/bigcache/[email protected]/encoding.go:58
github.com/allegro/bigcache/v3.(*cacheShard).onEvict(0xc008f81568, {0xc35b048f7b, 0x4121e60c4129bdd3, 0x5}, 0x2600c000014800, 0x5)
d:/mygo/pkg/mod/github.com/allegro/bigcache/[email protected]/shard.go:271 +0x65
github.com/allegro/bigcache/v3.(*cacheShard).set(0xc008f81560, {0xc025ae7d70, 0x26}, 0x12f219, {0xc000014800, 0x3ff, 0x400})
d:/mygo/pkg/mod/github.com/allegro/bigcache/[email protected]/shard.go:134 +0x1a5
github.com/allegro/bigcache/v3.(*BigCache).Set(0xc00001ca90, {0xc025ae7d70, 0x26}, {0xc000014800, 0x3ff, 0x400})
d:/mygo/pkg/mod/github.com/allegro/bigcache/[email protected]/bigcache.go:133 +0x8d
main.main.func1()
d:/mygo/src/test/testbigcache/main.go:31 +0x11a
created by main.main
d:/mygo/src/test/testbigcache/main.go:26 +0x1ac
package main
import (
"crypto/md5"
"encoding/hex"
"strconv"
"strings"
"sync"
"time"
"github.com/allegro/bigcache/v3"
)
func Md5HashString(str string) string {
h := md5.New()
h.Write([]byte(str))
return hex.EncodeToString(h.Sum(nil))
}
func main() {
config := bigcache.DefaultConfig(10 * time.Millisecond)
big, _ := bigcache.NewBigCache(config)
body := []byte(strings.Repeat("x", 1023))
var wg sync.WaitGroup
for i := 0; i < 1000; i++ {
wg.Add(1)
go func() {
defer wg.Done()
for i := int64(0); i < 10000000; i++ {
_md5 := Md5HashString(strconv.FormatInt(i, 10))
_key := _md5 + "_" + strconv.FormatInt(i, 10)
big.Set(_key, body)
big.Get(_key)
}
}()
}
wg.Wait()
}
Win 10 ,Go 1.17.6, BigCache v3.01 100% reproducible.
