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panic: runtime error with 32 bits CPU Arquitectures #755

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dumacp opened this issue Nov 11, 2022 · 0 comments
Open

panic: runtime error with 32 bits CPU Arquitectures #755

dumacp opened this issue Nov 11, 2022 · 0 comments

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@dumacp
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dumacp commented Nov 11, 2022

Describe the bug

This code:

func (s *SliceMap) GetBucket(key string) cmap.ConcurrentMap {
	hash := murmur32.Sum32([]byte(key))
	index := int(hash) % len(s.LocalPIDs)

	return s.LocalPIDs[index]
}

in https://github.com/asynkron/protoactor-go/blob/dev/actor/process_registry.go

cuases a panic: runtime error: index out of range [-327] when the code is compiled for 32 bit architecture

To Reproduce

Run the next code in 32 bit arquitecture

package main

import (
        "time"

        "github.com/asynkron/protoactor-go/actor"
        "github.com/asynkron/protoactor-go/remote"
)

func main() {
        sys := actor.NewActorSystem()

        rconfig := remote.Configure("127.0.0.1", 8910)
        r := remote.NewRemote(sys, rconfig)
        r.Start()
        time.Sleep(30 * time.Second)
}

The instruction hash := murmur32.Sum32([]byte(key)) in the function func (s *SliceMap) GetBucket(key string) cmap.ConcurrentMap returns a uint32, the conversion int(hash) in 32 bit arquitecture could return a negative number, and a panic in s.LocalPIDs[index] when the index is negative.

panic: runtime error: index out of range [-327]

goroutine 1 [running]:
github.com/asynkron/protoactor-go/actor.(*SliceMap).GetBucket(0x149fbb0, {0x141a0f0, 0xa})
	/home/duma/go/pkg/mod/github.com/asynkron/[email protected]/actor/process_registry.go:38 +0xd0
github.com/asynkron/protoactor-go/actor.(*ProcessRegistryValue).Add(0x1922000, {0x6dc6a8, 0x140e110}, {0x141a0f0, 0xa})
	/home/duma/go/pkg/mod/github.com/asynkron/[email protected]/actor/process_registry.go:89 +0x30
github.com/asynkron/protoactor-go/actor.(*guardiansValue).newGuardian(0x1410040, {0x6da25c, 0xa5c8a0})
	/home/duma/go/pkg/mod/github.com/asynkron/[email protected]/actor/guardian.go:39 +0x114
github.com/asynkron/protoactor-go/actor.(*guardiansValue).getGuardianPid(0x1410040, {0x6da25c, 0xa5c8a0})
	/home/duma/go/pkg/mod/github.com/asynkron/[email protected]/actor/guardian.go:26 +0x8c
github.com/asynkron/protoactor-go/actor.(*RootContext).Self(0x19240f0)
	/home/duma/go/pkg/mod/github.com/asynkron/[email protected]/actor/root_context.go:81 +0x3c
github.com/asynkron/protoactor-go/actor.glob..func1(0x1480d50, {0x6122aa, 0x9}, 0x193c000, {0x6deb00, 0x19240f0})
	/home/duma/go/pkg/mod/github.com/asynkron/[email protected]/actor/props.go:27 +0x28
github.com/asynkron/protoactor-go/actor.(*Props).spawn(0x193c000, 0x1480d50, {0x6122aa, 0x9}, {0x6deb00, 0x19240f0})
	/home/duma/go/pkg/mod/github.com/asynkron/[email protected]/actor/props.go:144 +0x60
github.com/asynkron/protoactor-go/actor.(*RootContext).SpawnNamed(0x1924000, 0x193c000, {0x6122aa, 0x9})
	/home/duma/go/pkg/mod/github.com/asynkron/[email protected]/actor/root_context.go:186 +0x134
github.com/asynkron/protoactor-go/remote.(*endpointManager).startActivator(0x1920920)
	/home/duma/go/pkg/mod/github.com/asynkron/[email protected]/remote/endpoint_manager.go:128 +0xec
github.com/asynkron/protoactor-go/remote.(*endpointManager).start(0x1920920)
	/home/duma/go/pkg/mod/github.com/asynkron/[email protected]/remote/endpoint_manager.go:85 +0xc4
github.com/asynkron/protoactor-go/remote.(*Remote).Start(0x1920900)
	/home/duma/go/pkg/mod/github.com/asynkron/[email protected]/remote/server.go:79 +0x4f8
main.main()
	/tests/main_bugprotocator/main.go:15 +0x9c

Expected behavior
avoid conversion int32 from uint32 when the return is negative.

Additional context
The problem is in 32 bit Arquitecture because the built-in type int is a 32 bit data.

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