the code is below.
```
package main
import "math/rand"
import "fmt"
/*
#include <stdio.h>
#include <stdlib.h>
void t(const short *buf, size_t buf_size) {
printf("in t.");
printf("0: %d ", buf[0]);
printf("buf_size-1: %d\n", buf[buf_size-1]);
}
*/
import "C"
func main() {
for {
a := make([]byte, 178209)
rand.Read(a)
fmt.Println(a[0], a[len(a)-1])
aPointer := C.CBytes(a)
C.t((*C.short)(aPointer), C.size_t(len(a)))
C.free(aPointer)
}
}
```
And result is
```
root@ieltscms-v183-tp9xn:/# go run main.go
82 59
in t.0: -686 buf_size-1: 0
111 248
fatal error: unexpected signal during runtime execution
[signal SIGSEGV: segmentation violation code=0x1 addr=0x1279850 pc=0x48ac2b]
runtime stack:
runtime.throw(0x4c07c2, 0x2a)
/usr/local/go/src/runtime/panic.go:605 +0x95 fp=0x7fff87b66950
sp=0x7fff87b66930 pc=0x428ba5
runtime.sigpanic()
/usr/local/go/src/runtime/signal_unix.go:351 +0x2b8 fp=0x7fff87b669a0
sp=0x7fff87b66950 pc=0x43bc38
goroutine 1 [syscall, locked to thread]:
runtime.cgocall(0x48ac60, 0xc420067f00, 0x0)
/usr/local/go/src/runtime/cgocall.go:132 +0xe4 fp=0xc420067ec0
sp=0xc420067e80 pc=0x402e34
main._Cfunc_t(0x1222810, 0x2b821)
command-line-arguments/_obj/_cgo_gotypes.go:67 +0x45 fp=0xc420067f00
sp=0xc420067ec0 pc=0x48a795
main.main()
/main.go:25 +0xd7 fp=0xc420067f80 sp=0xc420067f00 pc=0x48a967
runtime.main()
/usr/local/go/src/runtime/proc.go:195 +0x226 fp=0xc420067fe0
sp=0xc420067f80 pc=0x42a296
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:2337 +0x1 fp=0xc420067fe8
sp=0xc420067fe0 pc=0x452b11
goroutine 2 [force gc (idle)]:
runtime.gopark(0x4c1c00, 0x732ac0, 0x4bbfc4, 0xf, 0x14, 0x1)
/usr/local/go/src/runtime/proc.go:287 +0x12c fp=0xc420044768
sp=0xc420044738 pc=0x42a73c
runtime.goparkunlock(0x732ac0, 0x4bbfc4, 0xf, 0xc420000114, 0x1)
/usr/local/go/src/runtime/proc.go:293 +0x5e fp=0xc4200447a8
sp=0xc420044768 pc=0x42a82e
runtime.forcegchelper()
/usr/local/go/src/runtime/proc.go:245 +0xcc fp=0xc4200447e0
sp=0xc4200447a8 pc=0x42a55c
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:2337 +0x1 fp=0xc4200447e8
sp=0xc4200447e0 pc=0x452b11
created by runtime.init.4
/usr/local/go/src/runtime/proc.go:234 +0x35
goroutine 3 [GC sweep wait]:
runtime.gopark(0x4c1c00, 0x732bc0, 0x4bbb8d, 0xd, 0x41df14, 0x1)
/usr/local/go/src/runtime/proc.go:287 +0x12c fp=0xc420044f60
sp=0xc420044f30 pc=0x42a73c
runtime.goparkunlock(0x732bc0, 0x4bbb8d, 0xd, 0x14, 0x1)
/usr/local/go/src/runtime/proc.go:293 +0x5e fp=0xc420044fa0
sp=0xc420044f60 pc=0x42a82e
runtime.bgsweep(0xc42002e070)
/usr/local/go/src/runtime/mgcsweep.go:52 +0xa3 fp=0xc420044fd8
sp=0xc420044fa0 pc=0x41dfc3
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:2337 +0x1 fp=0xc420044fe0
sp=0xc420044fd8 pc=0x452b11
created by runtime.gcenable
/usr/local/go/src/runtime/mgc.go:216 +0x58
goroutine 4 [finalizer wait]:
runtime.gopark(0x4c1c00, 0x750eb0, 0x4bbdd0, 0xe, 0x14, 0x1)
/usr/local/go/src/runtime/proc.go:287 +0x12c fp=0xc420045700
sp=0xc4200456d0 pc=0x42a73c
runtime.goparkunlock(0x750eb0, 0x4bbdd0, 0xe, 0x14, 0x1)
/usr/local/go/src/runtime/proc.go:293 +0x5e fp=0xc420045740
sp=0xc420045700 pc=0x42a82e
runtime.runfinq()
/usr/local/go/src/runtime/mfinal.go:175 +0xb8 fp=0xc4200457e0
sp=0xc420045740 pc=0x415028
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:2337 +0x1 fp=0xc4200457e8
sp=0xc4200457e0 pc=0x452b11
created by runtime.createfing
/usr/local/go/src/runtime/mfinal.go:156 +0x62
signal: aborted (core dumped)
```
I pass the `aPointer` to c function `t`. And it will panic, after the 1st
loop.
And I try move `a := make([]byte, 178209)` to outside of for loop. The
program work fine.
Could anyone tell me why this happened? thx.
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