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| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2021-11-29 15:07:04 -0500 |
|---|---|---|
| committer | Michael Knyszek <mknyszek@google.com> | 2021-12-01 22:09:36 +0000 |
| commit | f2b0149e5701939ebbe05449e58ab162d98d7a22 (patch) | |
| tree | 6d292ed15f98e229efec04b30c0bd9e77318feb3 /src/runtime/sys_darwin_arm64.go | |
| parent | f6103e9b560e1089a1491cc6438b24074ad05957 (diff) | |
| download | go-f2b0149e5701939ebbe05449e58ab162d98d7a22.tar.gz go-f2b0149e5701939ebbe05449e58ab162d98d7a22.zip | |
[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>
Diffstat (limited to 'src/runtime/sys_darwin_arm64.go')
| -rw-r--r-- | src/runtime/sys_darwin_arm64.go | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/runtime/sys_darwin_arm64.go b/src/runtime/sys_darwin_arm64.go index 9c14f33a1c..471e93cb71 100644 --- 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() |