[release-branch.go1.16] runtime: keep //go:cgo_unsafe_args arguments alive to prevent GC

When syscall's DLL.FindProc calls into syscall_getprocaddress with a
byte slice pointer, we need to keep those bytes alive. Otherwise the GC
will collect the allocation, and we wind up calling `GetProcAddress` on
garbage, which showed up as various flakes in the builders. It turns out
that this problem extends to many uses of //go:cgo_unsafe_args
throughout, on all platforms. So this patch fixes the issue by keeping
non-integer pointer arguments alive through their invocation in
//go:cgo_unsafe_args functions.

Fixes #49867.
Updates #49731.

Change-Id: I93e4fbc2e8e210cb3fc53149708758bb33f2f9c7
Reviewed-on: https://go-review.googlesource.com/c/go/+/368356
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

diff --git a/src/runtime/sys_darwin.go b/src/runtime/sys_darwin.go
index 4a3f2fc453d30935cc71755ce0994bd7e7facdd2..bf124315dfd48f8e77c78c23e42460d8f3691b6f 100644 (file)
--- a/src/runtime/sys_darwin.go
+++ b/src/runtime/sys_darwin.go
@@ -102,28 +102,38 @@ func syscallNoErr()
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_attr_init(attr *pthreadattr) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_attr_init_trampoline)), unsafe.Pointer(&attr))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_attr_init_trampoline)), unsafe.Pointer(&attr))
+       KeepAlive(attr)
+       return ret
 }
 func pthread_attr_init_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_attr_getstacksize(attr *pthreadattr, size *uintptr) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_attr_getstacksize_trampoline)), unsafe.Pointer(&attr))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_attr_getstacksize_trampoline)), unsafe.Pointer(&attr))
+       KeepAlive(attr)
+       KeepAlive(size)
+       return ret
 }
 func pthread_attr_getstacksize_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_attr_setdetachstate(attr *pthreadattr, state int) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_attr_setdetachstate_trampoline)), unsafe.Pointer(&attr))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_attr_setdetachstate_trampoline)), unsafe.Pointer(&attr))
+       KeepAlive(attr)
+       return ret
 }
 func pthread_attr_setdetachstate_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_create(attr *pthreadattr, start uintptr, arg unsafe.Pointer) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_create_trampoline)), unsafe.Pointer(&attr))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_create_trampoline)), unsafe.Pointer(&attr))
+       KeepAlive(attr)
+       KeepAlive(arg) // Just for consistency. Arg of course needs to be kept alive for the start function.
+       return ret
 }
 func pthread_create_trampoline()
 
@@ -172,6 +182,7 @@ func mmap_trampoline()
 //go:cgo_unsafe_args
 func munmap(addr unsafe.Pointer, n uintptr) {
        libcCall(unsafe.Pointer(funcPC(munmap_trampoline)), unsafe.Pointer(&addr))
+       KeepAlive(addr) // Just for consistency. Hopefully addr is not a Go address.
 }
 func munmap_trampoline()
 
@@ -179,6 +190,7 @@ func munmap_trampoline()
 //go:cgo_unsafe_args
 func madvise(addr unsafe.Pointer, n uintptr, flags int32) {
        libcCall(unsafe.Pointer(funcPC(madvise_trampoline)), unsafe.Pointer(&addr))
+       KeepAlive(addr) // Just for consistency. Hopefully addr is not a Go address.
 }
 func madvise_trampoline()
 
@@ -186,13 +198,16 @@ func madvise_trampoline()
 //go:cgo_unsafe_args
 func mlock(addr unsafe.Pointer, n uintptr) {
        libcCall(unsafe.Pointer(funcPC(mlock_trampoline)), unsafe.Pointer(&addr))
+       KeepAlive(addr) // Just for consistency. Hopefully addr is not a Go address.
 }
 func mlock_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func read(fd int32, p unsafe.Pointer, n int32) int32 {
-       return libcCall(unsafe.Pointer(funcPC(read_trampoline)), unsafe.Pointer(&fd))
+       ret := libcCall(unsafe.Pointer(funcPC(read_trampoline)), unsafe.Pointer(&fd))
+       KeepAlive(p)
+       return ret
 }
 func read_trampoline()
 
@@ -230,14 +245,18 @@ func usleep_trampoline()
 //go:nosplit
 //go:cgo_unsafe_args
 func write1(fd uintptr, p unsafe.Pointer, n int32) int32 {
-       return libcCall(unsafe.Pointer(funcPC(write_trampoline)), unsafe.Pointer(&fd))
+       ret := libcCall(unsafe.Pointer(funcPC(write_trampoline)), unsafe.Pointer(&fd))
+       KeepAlive(p)
+       return ret
 }
 func write_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func open(name *byte, mode, perm int32) (ret int32) {
-       return libcCall(unsafe.Pointer(funcPC(open_trampoline)), unsafe.Pointer(&name))
+       ret = libcCall(unsafe.Pointer(funcPC(open_trampoline)), unsafe.Pointer(&name))
+       KeepAlive(name)
+       return
 }
 func open_trampoline()
 
@@ -276,6 +295,8 @@ func walltime_trampoline()
 //go:cgo_unsafe_args
 func sigaction(sig uint32, new *usigactiont, old *usigactiont) {
        libcCall(unsafe.Pointer(funcPC(sigaction_trampoline)), unsafe.Pointer(&sig))
+       KeepAlive(new)
+       KeepAlive(old)
 }
 func sigaction_trampoline()
 
@@ -283,6 +304,8 @@ func sigaction_trampoline()
 //go:cgo_unsafe_args
 func sigprocmask(how uint32, new *sigset, old *sigset) {
        libcCall(unsafe.Pointer(funcPC(sigprocmask_trampoline)), unsafe.Pointer(&how))
+       KeepAlive(new)
+       KeepAlive(old)
 }
 func sigprocmask_trampoline()
 
@@ -297,6 +320,8 @@ func sigaltstack(new *stackt, old *stackt) {
                new.ss_size = 32768
        }
        libcCall(unsafe.Pointer(funcPC(sigaltstack_trampoline)), unsafe.Pointer(&new))
+       KeepAlive(new)
+       KeepAlive(old)
 }
 func sigaltstack_trampoline()
 
@@ -311,20 +336,32 @@ func raiseproc_trampoline()
 //go:cgo_unsafe_args
 func setitimer(mode int32, new, old *itimerval) {
        libcCall(unsafe.Pointer(funcPC(setitimer_trampoline)), unsafe.Pointer(&mode))
+       KeepAlive(new)
+       KeepAlive(old)
 }
 func setitimer_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func sysctl(mib *uint32, miblen uint32, oldp *byte, oldlenp *uintptr, newp *byte, newlen uintptr) int32 {
-       return libcCall(unsafe.Pointer(funcPC(sysctl_trampoline)), unsafe.Pointer(&mib))
+       ret := libcCall(unsafe.Pointer(funcPC(sysctl_trampoline)), unsafe.Pointer(&mib))
+       KeepAlive(mib)
+       KeepAlive(oldp)
+       KeepAlive(oldlenp)
+       KeepAlive(newp)
+       return ret
 }
 func sysctl_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func sysctlbyname(name *byte, oldp *byte, oldlenp *uintptr, newp *byte, newlen uintptr) int32 {
-       return libcCall(unsafe.Pointer(funcPC(sysctlbyname_trampoline)), unsafe.Pointer(&name))
+       ret := libcCall(unsafe.Pointer(funcPC(sysctlbyname_trampoline)), unsafe.Pointer(&name))
+       KeepAlive(name)
+       KeepAlive(oldp)
+       KeepAlive(oldlenp)
+       KeepAlive(newp)
+       return ret
 }
 func sysctlbyname_trampoline()
 
@@ -346,56 +383,79 @@ func kqueue_trampoline()
 //go:nosplit
 //go:cgo_unsafe_args
 func kevent(kq int32, ch *keventt, nch int32, ev *keventt, nev int32, ts *timespec) int32 {
-       return libcCall(unsafe.Pointer(funcPC(kevent_trampoline)), unsafe.Pointer(&kq))
+       ret := libcCall(unsafe.Pointer(funcPC(kevent_trampoline)), unsafe.Pointer(&kq))
+       KeepAlive(ch)
+       KeepAlive(ev)
+       KeepAlive(ts)
+       return ret
 }
 func kevent_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_mutex_init(m *pthreadmutex, attr *pthreadmutexattr) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_mutex_init_trampoline)), unsafe.Pointer(&m))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_mutex_init_trampoline)), unsafe.Pointer(&m))
+       KeepAlive(m)
+       KeepAlive(attr)
+       return ret
 }
 func pthread_mutex_init_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_mutex_lock(m *pthreadmutex) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_mutex_lock_trampoline)), unsafe.Pointer(&m))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_mutex_lock_trampoline)), unsafe.Pointer(&m))
+       KeepAlive(m)
+       return ret
 }
 func pthread_mutex_lock_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_mutex_unlock(m *pthreadmutex) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_mutex_unlock_trampoline)), unsafe.Pointer(&m))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_mutex_unlock_trampoline)), unsafe.Pointer(&m))
+       KeepAlive(m)
+       return ret
 }
 func pthread_mutex_unlock_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_cond_init(c *pthreadcond, attr *pthreadcondattr) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_cond_init_trampoline)), unsafe.Pointer(&c))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_cond_init_trampoline)), unsafe.Pointer(&c))
+       KeepAlive(c)
+       KeepAlive(attr)
+       return ret
 }
 func pthread_cond_init_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_cond_wait(c *pthreadcond, m *pthreadmutex) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_cond_wait_trampoline)), unsafe.Pointer(&c))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_cond_wait_trampoline)), unsafe.Pointer(&c))
+       KeepAlive(c)
+       KeepAlive(m)
+       return ret
 }
 func pthread_cond_wait_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_cond_timedwait_relative_np(c *pthreadcond, m *pthreadmutex, t *timespec) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_cond_timedwait_relative_np_trampoline)), unsafe.Pointer(&c))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_cond_timedwait_relative_np_trampoline)), unsafe.Pointer(&c))
+       KeepAlive(c)
+       KeepAlive(m)
+       KeepAlive(t)
+       return ret
 }
 func pthread_cond_timedwait_relative_np_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_cond_signal(c *pthreadcond) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_cond_signal_trampoline)), unsafe.Pointer(&c))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_cond_signal_trampoline)), unsafe.Pointer(&c))
+       KeepAlive(c)
+       return ret
 }
 func pthread_cond_signal_trampoline()
 

diff --git a/src/runtime/sys_darwin_arm64.go b/src/runtime/sys_darwin_arm64.go
index 9c14f33a1ce2389778dd17c144c59dcd20b95fa3..471e93cb71c9217f24bfa63a166bd01048d805d7 100644 (file)
--- a/src/runtime/sys_darwin_arm64.go
+++ b/src/runtime/sys_darwin_arm64.go
@@ -14,7 +14,9 @@ import (
 //go:nosplit
 //go:cgo_unsafe_args
 func g0_pthread_key_create(k *pthreadkey, destructor uintptr) int32 {
-       return asmcgocall(unsafe.Pointer(funcPC(pthread_key_create_trampoline)), unsafe.Pointer(&k))
+       ret := asmcgocall(unsafe.Pointer(funcPC(pthread_key_create_trampoline)), unsafe.Pointer(&k))
+       KeepAlive(k)
+       return ret
 }
 func pthread_key_create_trampoline()
 

diff --git a/src/runtime/sys_openbsd.go b/src/runtime/sys_openbsd.go
index fcddf4d6a5635884fb4cdd5b61c71b7666dc3ac8..bda8a32ae8ec57a96f8f18a28991aed5f8f85e7f 100644 (file)
--- a/src/runtime/sys_openbsd.go
+++ b/src/runtime/sys_openbsd.go
@@ -14,35 +14,47 @@ import "unsafe"
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_attr_init(attr *pthreadattr) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_attr_init_trampoline)), unsafe.Pointer(&attr))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_attr_init_trampoline)), unsafe.Pointer(&attr))
+       KeepAlive(attr)
+       return ret
 }
 func pthread_attr_init_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_attr_destroy(attr *pthreadattr) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_attr_destroy_trampoline)), unsafe.Pointer(&attr))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_attr_destroy_trampoline)), unsafe.Pointer(&attr))
+       KeepAlive(attr)
+       return ret
 }
 func pthread_attr_destroy_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_attr_getstacksize(attr *pthreadattr, size *uintptr) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_attr_getstacksize_trampoline)), unsafe.Pointer(&attr))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_attr_getstacksize_trampoline)), unsafe.Pointer(&attr))
+       KeepAlive(attr)
+       KeepAlive(size)
+       return ret
 }
 func pthread_attr_getstacksize_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_attr_setdetachstate(attr *pthreadattr, state int) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_attr_setdetachstate_trampoline)), unsafe.Pointer(&attr))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_attr_setdetachstate_trampoline)), unsafe.Pointer(&attr))
+       KeepAlive(attr)
+       return ret
 }
 func pthread_attr_setdetachstate_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func pthread_create(attr *pthreadattr, start uintptr, arg unsafe.Pointer) int32 {
-       return libcCall(unsafe.Pointer(funcPC(pthread_create_trampoline)), unsafe.Pointer(&attr))
+       ret := libcCall(unsafe.Pointer(funcPC(pthread_create_trampoline)), unsafe.Pointer(&attr))
+       KeepAlive(attr)
+       KeepAlive(arg) // Just for consistency. Arg of course needs to be kept alive for the start function.
+       return ret
 }
 func pthread_create_trampoline()
 

diff --git a/src/runtime/sys_openbsd1.go b/src/runtime/sys_openbsd1.go
index e2886218db5da06b1893e73d1b5c08db8c61f461..08a978b4aea2a71d999e901d076bc1044844440f 100644 (file)
--- a/src/runtime/sys_openbsd1.go
+++ b/src/runtime/sys_openbsd1.go
@@ -11,7 +11,10 @@ import "unsafe"
 //go:nosplit
 //go:cgo_unsafe_args
 func thrsleep(ident uintptr, clock_id int32, tsp *timespec, lock uintptr, abort *uint32) int32 {
-       return libcCall(unsafe.Pointer(funcPC(thrsleep_trampoline)), unsafe.Pointer(&ident))
+       ret := libcCall(unsafe.Pointer(funcPC(thrsleep_trampoline)), unsafe.Pointer(&ident))
+       KeepAlive(tsp)
+       KeepAlive(abort)
+       return ret
 }
 func thrsleep_trampoline()
 

diff --git a/src/runtime/sys_openbsd2.go b/src/runtime/sys_openbsd2.go
index 474e7145e796220187bba2817a7eb0e513d27ea2..5303a68cf5ee53921293eb3f2a867fb2ea83ff9f 100644 (file)
--- a/src/runtime/sys_openbsd2.go
+++ b/src/runtime/sys_openbsd2.go
@@ -53,6 +53,7 @@ func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (un
                ret2            int
        }{addr, n, prot, flags, fd, off, nil, 0}
        libcCall(unsafe.Pointer(funcPC(mmap_trampoline)), unsafe.Pointer(&args))
+       KeepAlive(addr) // Just for consistency. Hopefully addr is not a Go address.
        return args.ret1, args.ret2
 }
 func mmap_trampoline()
@@ -61,6 +62,7 @@ func mmap_trampoline()
 //go:cgo_unsafe_args
 func munmap(addr unsafe.Pointer, n uintptr) {
        libcCall(unsafe.Pointer(funcPC(munmap_trampoline)), unsafe.Pointer(&addr))
+       KeepAlive(addr) // Just for consistency. Hopefully addr is not a Go address.
 }
 func munmap_trampoline()
 
@@ -68,13 +70,16 @@ func munmap_trampoline()
 //go:cgo_unsafe_args
 func madvise(addr unsafe.Pointer, n uintptr, flags int32) {
        libcCall(unsafe.Pointer(funcPC(madvise_trampoline)), unsafe.Pointer(&addr))
+       KeepAlive(addr) // Just for consistency. Hopefully addr is not a Go address.
 }
 func madvise_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func open(name *byte, mode, perm int32) (ret int32) {
-       return libcCall(unsafe.Pointer(funcPC(open_trampoline)), unsafe.Pointer(&name))
+       ret = libcCall(unsafe.Pointer(funcPC(open_trampoline)), unsafe.Pointer(&name))
+       KeepAlive(name)
+       return
 }
 func open_trampoline()
 
@@ -88,14 +93,18 @@ func close_trampoline()
 //go:nosplit
 //go:cgo_unsafe_args
 func read(fd int32, p unsafe.Pointer, n int32) int32 {
-       return libcCall(unsafe.Pointer(funcPC(read_trampoline)), unsafe.Pointer(&fd))
+       ret := libcCall(unsafe.Pointer(funcPC(read_trampoline)), unsafe.Pointer(&fd))
+       KeepAlive(p)
+       return ret
 }
 func read_trampoline()
 
 //go:nosplit
 //go:cgo_unsafe_args
 func write1(fd uintptr, p unsafe.Pointer, n int32) int32 {
-       return libcCall(unsafe.Pointer(funcPC(write_trampoline)), unsafe.Pointer(&fd))
+       ret := libcCall(unsafe.Pointer(funcPC(write_trampoline)), unsafe.Pointer(&fd))
+       KeepAlive(p)
+       return ret
 }
 func write_trampoline()
 
@@ -118,6 +127,8 @@ func pipe2_trampoline()
 //go:cgo_unsafe_args
 func setitimer(mode int32, new, old *itimerval) {
        libcCall(unsafe.Pointer(funcPC(setitimer_trampoline)), unsafe.Pointer(&mode))
+       KeepAlive(new)
+       KeepAlive(old)
 }
 func setitimer_trampoline()
 
@@ -131,7 +142,12 @@ func usleep_trampoline()
 //go:nosplit
 //go:cgo_unsafe_args
 func sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32 {
-       return libcCall(unsafe.Pointer(funcPC(sysctl_trampoline)), unsafe.Pointer(&mib))
+       ret := libcCall(unsafe.Pointer(funcPC(sysctl_trampoline)), unsafe.Pointer(&mib))
+       KeepAlive(mib)
+       KeepAlive(out)
+       KeepAlive(size)
+       KeepAlive(dst)
+       return ret
 }
 func sysctl_trampoline()
 
@@ -175,7 +191,11 @@ func kqueue_trampoline()
 //go:nosplit
 //go:cgo_unsafe_args
 func kevent(kq int32, ch *keventt, nch int32, ev *keventt, nev int32, ts *timespec) int32 {
-       return libcCall(unsafe.Pointer(funcPC(kevent_trampoline)), unsafe.Pointer(&kq))
+       ret := libcCall(unsafe.Pointer(funcPC(kevent_trampoline)), unsafe.Pointer(&kq))
+       KeepAlive(ch)
+       KeepAlive(ev)
+       KeepAlive(ts)
+       return ret
 }
 func kevent_trampoline()
 
@@ -183,6 +203,8 @@ func kevent_trampoline()
 //go:cgo_unsafe_args
 func sigaction(sig uint32, new *sigactiont, old *sigactiont) {
        libcCall(unsafe.Pointer(funcPC(sigaction_trampoline)), unsafe.Pointer(&sig))
+       KeepAlive(new)
+       KeepAlive(old)
 }
 func sigaction_trampoline()
 
@@ -190,6 +212,8 @@ func sigaction_trampoline()
 //go:cgo_unsafe_args
 func sigprocmask(how uint32, new *sigset, old *sigset) {
        libcCall(unsafe.Pointer(funcPC(sigprocmask_trampoline)), unsafe.Pointer(&how))
+       KeepAlive(new)
+       KeepAlive(old)
 }
 func sigprocmask_trampoline()
 
@@ -197,6 +221,8 @@ func sigprocmask_trampoline()
 //go:cgo_unsafe_args
 func sigaltstack(new *stackt, old *stackt) {
        libcCall(unsafe.Pointer(funcPC(sigaltstack_trampoline)), unsafe.Pointer(&new))
+       KeepAlive(new)
+       KeepAlive(old)
 }
 func sigaltstack_trampoline()
 

diff --git a/src/runtime/syscall_solaris.go b/src/runtime/syscall_solaris.go
index 094516927f3f495ad9b4817772fa510db3e35bf9..ed5b7d19f900e7fced03693ee7fe2e2387f2b4ec 100644 (file)
--- a/src/runtime/syscall_solaris.go
+++ b/src/runtime/syscall_solaris.go
@@ -303,6 +303,8 @@ func syscall_wait4(pid uintptr, wstatus *uint32, options uintptr, rusage unsafe.
        entersyscallblock()
        asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&call))
        exitsyscall()
+       KeepAlive(wstatus)
+       KeepAlive(rusage)
        return int(call.r1), call.err
 }
 

diff --git a/src/runtime/syscall_windows.go b/src/runtime/syscall_windows.go
index 7835b492f78146f49a6b9fe4719298ccf03ff6d4..296f6a39c1fc6b4dc5ef0df497a0e770f6a0d7d6 100644 (file)
--- a/src/runtime/syscall_windows.go
+++ b/src/runtime/syscall_windows.go
@@ -276,6 +276,8 @@ func syscall_loadsystemlibrary(filename *uint16, absoluteFilepath *uint16) (hand
        }
 
        cgocall(asmstdcallAddr, unsafe.Pointer(c))
+       KeepAlive(filename)
+       KeepAlive(absoluteFilepath)
        handle = c.r1
        if handle == 0 {
                err = c.err
@@ -294,6 +296,7 @@ func syscall_loadlibrary(filename *uint16) (handle, err uintptr) {
        c.n = 1
        c.args = uintptr(noescape(unsafe.Pointer(&filename)))
        cgocall(asmstdcallAddr, unsafe.Pointer(c))
+       KeepAlive(filename)
        handle = c.r1
        if handle == 0 {
                err = c.err
@@ -311,6 +314,7 @@ func syscall_getprocaddress(handle uintptr, procname *byte) (outhandle, err uint
        c.n = 2
        c.args = uintptr(noescape(unsafe.Pointer(&handle)))
        cgocall(asmstdcallAddr, unsafe.Pointer(c))
+       KeepAlive(procname)
        outhandle = c.r1
        if outhandle == 0 {
                err = c.err