cmd/compile: value assigned to global fails to escape #29000
Labels
FrozenDueToAge
NeedsInvestigation
Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
release-blocker
Milestone
Comments
|
I can confirm the failure on go1.11.2, but I can't repro it with tip ( Here's a very slightly reduced test case (removed unneeded import, uncalled function) with a couple comments added about crash behavior when removing other lines: package bug
import (
"fmt"
"testing"
)
type A struct {
buf [32]byte
}
type Z struct {
buf [256]byte
}
var saved interface{}
func (a A) f(x interface{}) {
switch x := x.(type) {
case Z:
a.g(x)
}
}
func (a A) g(z Z) {
a.h(a, z)
}
func (a A) h(_ A, x interface{}) {
fmt.Printf("h\n") // Commenting out just this line causes the test to pass.
saved = x
return
a.f(x) // Commentint out just this line causes the test to pass.
}
func TestBug(t *testing.T) {
big := make([]byte, 1024, 1024)
big[0] = 1
var z Z
z.buf[0] = 1
var a A
a.f(z)
m := make(map[int]int)
for i := 0; i < 1000000; i++ {
m[i] = i
}
} |
|
Here's another version of the bug-triggering code that's better in two important ways:
package main
import (
_ "net"
)
type A struct {
buf [32]byte
}
type Z struct {
buf [256]byte
}
var saved interface{}
func (a A) f(x interface{}) {
xx := x.(Z)
a.g(xx)
}
func (a A) g(z Z) {
allocstuff()
a.h(a, z)
}
func (a A) h(_ A, x interface{}) {
saved = x
return
a.f(x)
}
func allocstuff() {
m := make(map[int]int)
for i := 0; i < 1000000; i++ {
m[i] = i
}
}
func main() {
var z Z
var a A
a.f(z)
allocstuff()
}
Running it, I get: nickolai@kalahari:~/tmp/gobug2$ GOGC=1 ~/tmp/go/bin/go run bug.go runtime: pointer 0xc0000ab8f8 to unused region of span span.base()=0xc000364000 span.limit=0xc000366000 span.state=1 runtime: found in object at *(0x54a3a0+0x248) object=0x54a3a0 s=nil fatal error: found bad pointer in Go heap (incorrect use of unsafe or cgo?) runtime stack: runtime.throw(0x4bad42, 0x3e) /home/nickolai/tmp/go/src/runtime/panic.go:608 +0x72 fp=0x7fc578ae7c70 sp=0x7fc578ae7c40 pc=0x428722 runtime.findObject(0xc0000ab8f8, 0x54a3a0, 0x248, 0x7fc57d637360, 0xc00002d770, 0xa) /home/nickolai/tmp/go/src/runtime/mbitmap.go:397 +0x3b4 fp=0x7fc578ae7cc0 sp=0x7fc578ae7c70 pc=0x411e34 runtime.scanblock(0x54a3a0, 0x1bb30, 0x7fc57d6409a6, 0xc00002d770, 0x0) /home/nickolai/tmp/go/src/runtime/mgcmark.go:1057 +0xa8 fp=0x7fc578ae7d20 sp=0x7fc578ae7cc0 pc=0x41cff8 runtime.markrootBlock(0x54a3a0, 0x1bb30, 0x7fc57d6409a6, 0xc00002d770, 0x0) /home/nickolai/tmp/go/src/runtime/mgcmark.go:251 +0x9c fp=0x7fc578ae7d58 sp=0x7fc578ae7d20 pc=0x41b41c runtime.markroot(0xc00002d770, 0x3) /home/nickolai/tmp/go/src/runtime/mgcmark.go:166 +0x1b1 fp=0x7fc578ae7dd8 sp=0x7fc578ae7d58 pc=0x41b1c1 runtime.gcDrainN(0xc00002d770, 0x10000, 0x2f983c87bcb8a) /home/nickolai/tmp/go/src/runtime/mgcmark.go:1006 +0xff fp=0x7fc578ae7e08 sp=0x7fc578ae7dd8 pc=0x41ce1f runtime.gcAssistAlloc1(0xc000000180, 0x10000) /home/nickolai/tmp/go/src/runtime/mgcmark.go:512 +0xf4 fp=0x7fc578ae7e58 sp=0x7fc578ae7e08 pc=0x41bb54 runtime.gcAssistAlloc.func1() /home/nickolai/tmp/go/src/runtime/mgcmark.go:423 +0x33 fp=0x7fc578ae7e78 sp=0x7fc578ae7e58 pc=0x44d073 runtime.systemstack(0x0) /home/nickolai/tmp/go/src/runtime/asm_amd64.s:351 +0x66 fp=0x7fc578ae7e80 sp=0x7fc578ae7e78 pc=0x44eef6 runtime.mstart() /home/nickolai/tmp/go/src/runtime/proc.go:1153 fp=0x7fc578ae7e88 sp=0x7fc578ae7e80 pc=0x42cc30 goroutine 1 [GC assist marking]: runtime.systemstack_switch() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:311 fp=0xc00005ba38 sp=0xc00005ba30 pc=0x44ee80 runtime.gcAssistAlloc(0xc000000180) /home/nickolai/tmp/go/src/runtime/mgcmark.go:422 +0x15c fp=0xc00005ba98 sp=0xc00005ba38 pc=0x41b8ec runtime.mallocgc(0x400, 0x49c840, 0x101, 0xc000364000) /home/nickolai/tmp/go/src/runtime/malloc.go:843 +0x8d6 fp=0xc00005bb38 sp=0xc00005ba98 pc=0x40bb86 runtime.growslice(0x49c840, 0xc000364000, 0x40, 0x40, 0x41, 0xc000364000, 0x20, 0x40) /home/nickolai/tmp/go/src/runtime/slice.go:181 +0x1e4 fp=0xc00005bba0 sp=0xc00005bb38 pc=0x43ba84 runtime.(*hmap).newoverflow(0xc00005bcf8, 0x4990e0, 0xc0000c7e00, 0xc0000d4370) /home/nickolai/tmp/go/src/runtime/map.go:269 +0x183 fp=0xc00005bc00 sp=0xc00005bba0 pc=0x40c7c3 runtime.mapassign_fast64(0x4990e0, 0xc00005bcf8, 0x142d, 0xc0000cdfc8) /home/nickolai/tmp/go/src/runtime/map_fast64.go:162 +0x207 fp=0xc00005bc40 sp=0xc00005bc00 pc=0x40fab7 main.allocstuff() /home/nickolai/tmp/gobug2/bug.go:37 +0xad fp=0xc00005bd38 sp=0xc00005bc40 pc=0x481c8d main.main() /home/nickolai/tmp/gobug2/bug.go:45 +0xad fp=0xc00005bf98 sp=0xc00005bd38 pc=0x481d6d runtime.main() /home/nickolai/tmp/go/src/runtime/proc.go:200 +0x204 fp=0xc00005bfe0 sp=0xc00005bf98 pc=0x42a084 runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00005bfe8 sp=0xc00005bfe0 pc=0x450f51 goroutine 2 [force gc (idle)]: runtime.gopark(0x4bb330, 0x54ab10, 0x1410, 0x1) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00004afb0 sp=0xc00004af90 pc=0x42a456 runtime.goparkunlock(...) /home/nickolai/tmp/go/src/runtime/proc.go:307 runtime.forcegchelper() /home/nickolai/tmp/go/src/runtime/proc.go:250 +0xb6 fp=0xc00004afe0 sp=0xc00004afb0 pc=0x42a306 runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00004afe8 sp=0xc00004afe0 pc=0x450f51 created by runtime.init.5 /home/nickolai/tmp/go/src/runtime/proc.go:239 +0x35 goroutine 3 [GC sweep wait]: runtime.gopark(0x4bb330, 0x54ac40, 0x140c, 0x1) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00004b7a8 sp=0xc00004b788 pc=0x42a456 runtime.goparkunlock(...) /home/nickolai/tmp/go/src/runtime/proc.go:307 runtime.bgsweep(0xc000022070) /home/nickolai/tmp/go/src/runtime/mgcsweep.go:89 +0x12d fp=0xc00004b7d8 sp=0xc00004b7a8 pc=0x41e97d runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00004b7e0 sp=0xc00004b7d8 pc=0x450f51 created by runtime.gcenable /home/nickolai/tmp/go/src/runtime/mgc.go:208 +0x58 goroutine 4 [finalizer wait]: runtime.gopark(0x4bb330, 0x565fc8, 0x140f, 0x1) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00004bf58 sp=0xc00004bf38 pc=0x42a456 runtime.goparkunlock(...) /home/nickolai/tmp/go/src/runtime/proc.go:307 runtime.runfinq() /home/nickolai/tmp/go/src/runtime/mfinal.go:175 +0xa5 fp=0xc00004bfe0 sp=0xc00004bf58 pc=0x415b45 runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00004bfe8 sp=0xc00004bfe0 pc=0x450f51 created by runtime.createfing /home/nickolai/tmp/go/src/runtime/mfinal.go:156 +0x61 goroutine 5 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc000350000, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00004a760 sp=0xc00004a740 pc=0x42a456 runtime.gcBgMarkWorker(0xc00002a000) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc00004a7d8 sp=0xc00004a760 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00004a7e0 sp=0xc00004a7d8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 18 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc000350010, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc000046760 sp=0xc000046740 pc=0x42a456 runtime.gcBgMarkWorker(0xc00002c500) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc0000467d8 sp=0xc000046760 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc0000467e0 sp=0xc0000467d8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 19 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc000350020, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc000046f60 sp=0xc000046f40 pc=0x42a456 runtime.gcBgMarkWorker(0xc00002ea00) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc000046fd8 sp=0xc000046f60 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc000046fe0 sp=0xc000046fd8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 20 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc000350030, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc000047760 sp=0xc000047740 pc=0x42a456 runtime.gcBgMarkWorker(0xc000030f00) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc0000477d8 sp=0xc000047760 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc0000477e0 sp=0xc0000477d8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 34 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc000350040, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00035a760 sp=0xc00035a740 pc=0x42a456 runtime.gcBgMarkWorker(0xc000033400) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc00035a7d8 sp=0xc00035a760 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00035a7e0 sp=0xc00035a7d8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 6 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc000016300, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00004c760 sp=0xc00004c740 pc=0x42a456 runtime.gcBgMarkWorker(0xc000035900) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc00004c7d8 sp=0xc00004c760 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00004c7e0 sp=0xc00004c7d8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 21 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc000016310, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc000047f60 sp=0xc000047f40 pc=0x42a456 runtime.gcBgMarkWorker(0xc000038000) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc000047fd8 sp=0xc000047f60 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc000047fe0 sp=0xc000047fd8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 7 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc00035e000, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00004cf60 sp=0xc00004cf40 pc=0x42a456 runtime.gcBgMarkWorker(0xc00003a500) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc00004cfd8 sp=0xc00004cf60 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00004cfe0 sp=0xc00004cfd8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 exit status 2 nickolai@kalahari:~/tmp/gobug2$ |
|
And a version that triggers the bug even without package main
import (
_ "net"
)
type Z struct {
buf [256]byte
}
var saved interface{}
func f(x interface{}) {
z := x.(Z)
g(z)
}
func g(z Z) {
allocstuff()
h(z, z, z)
}
func h(_ Z, _ Z, x interface{}) {
saved = x
return
f(x)
}
func allocstuff() {
m := make(map[int]int)
for i := 0; i < 1000000; i++ {
m[i] = i
}
}
func main() {
var z Z
f(z)
allocstuff()
}
leading to: nickolai@kalahari:~/tmp/gobug2$ ~/tmp/go/bin/go version go version devel +2b58ca6e3d Thu Nov 29 14:00:26 2018 +0000 linux/amd64 nickolai@kalahari:~/tmp/gobug2$ ~/tmp/go/bin/go run bug.go runtime: pointer 0xc00020fa58 to unused region of span span.base()=0xc0003fa000 span.limit=0xc0003fbf80 span.state=1 runtime: found in object at *(0x54a3a0+0x248) object=0x54a3a0 s=nil fatal error: found bad pointer in Go heap (incorrect use of unsafe or cgo?) runtime stack: runtime.throw(0x4bad42, 0x3e) /home/nickolai/tmp/go/src/runtime/panic.go:608 +0x72 fp=0x7f26135fec78 sp=0x7f26135fec48 pc=0x428722 runtime.findObject(0xc00020fa58, 0x54a3a0, 0x248, 0x7f26167eb360, 0xc00002d770, 0xa) /home/nickolai/tmp/go/src/runtime/mbitmap.go:397 +0x3b4 fp=0x7f26135fecc8 sp=0x7f26135fec78 pc=0x411e34 runtime.scanblock(0x54a3a0, 0x1bb30, 0x7f26167f49a6, 0xc00002d770, 0x0) /home/nickolai/tmp/go/src/runtime/mgcmark.go:1057 +0xa8 fp=0x7f26135fed28 sp=0x7f26135fecc8 pc=0x41cff8 runtime.markrootBlock(0x54a3a0, 0x1bb30, 0x7f26167f49a6, 0xc00002d770, 0x0) /home/nickolai/tmp/go/src/runtime/mgcmark.go:251 +0x9c fp=0x7f26135fed60 sp=0x7f26135fed28 pc=0x41b41c runtime.markroot(0xc00002d770, 0x7f2600000003) /home/nickolai/tmp/go/src/runtime/mgcmark.go:166 +0x1b1 fp=0x7f26135fede0 sp=0x7f26135fed60 pc=0x41b1c1 runtime.gcDrain(0xc00002d770, 0x7) /home/nickolai/tmp/go/src/runtime/mgcmark.go:886 +0x10e fp=0x7f26135fee38 sp=0x7f26135fede0 pc=0x41c9ee runtime.gcBgMarkWorker.func2() /home/nickolai/tmp/go/src/runtime/mgc.go:1821 +0x166 fp=0x7f26135fee78 sp=0x7f26135fee38 pc=0x44cf06 runtime.systemstack(0x0) /home/nickolai/tmp/go/src/runtime/asm_amd64.s:351 +0x66 fp=0x7f26135fee80 sp=0x7f26135fee78 pc=0x44eef6 runtime.mstart() /home/nickolai/tmp/go/src/runtime/proc.go:1153 fp=0x7f26135fee88 sp=0x7f26135fee80 pc=0x42cc30 goroutine 18 [GC worker (idle)]: runtime.systemstack_switch() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:311 fp=0xc000046760 sp=0xc000046758 pc=0x44ee80 runtime.gcBgMarkWorker(0xc00002c500) /home/nickolai/tmp/go/src/runtime/mgc.go:1785 +0x1b8 fp=0xc0000467d8 sp=0xc000046760 pc=0x4193e8 runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc0000467e0 sp=0xc0000467d8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 1 [runnable]: runtime.growslice(0x49c840, 0x0, 0x0, 0x0, 0x1, 0xc00005bd30, 0x410033, 0x4990e0) /home/nickolai/tmp/go/src/runtime/slice.go:76 +0x62e fp=0xc00005bce0 sp=0xc00005bcd8 pc=0x43bece runtime.(*hmap).newoverflow(0xc00005be38, 0x4990e0, 0xc006145fd0, 0xc0004e0240) /home/nickolai/tmp/go/src/runtime/map.go:269 +0x183 fp=0xc00005bd40 sp=0xc00005bce0 pc=0x40c7c3 runtime.mapassign_fast64(0x4990e0, 0xc00005be38, 0x6801f, 0xc0058badf8) /home/nickolai/tmp/go/src/runtime/map_fast64.go:162 +0x207 fp=0xc00005bd80 sp=0xc00005bd40 pc=0x40fab7 main.allocstuff() /home/nickolai/tmp/gobug2/bug.go:33 +0xad fp=0xc00005be78 sp=0xc00005bd80 pc=0x481c9d main.main() /home/nickolai/tmp/gobug2/bug.go:40 +0x68 fp=0xc00005bf98 sp=0xc00005be78 pc=0x481d38 runtime.main() /home/nickolai/tmp/go/src/runtime/proc.go:200 +0x204 fp=0xc00005bfe0 sp=0xc00005bf98 pc=0x42a084 runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00005bfe8 sp=0xc00005bfe0 pc=0x450f51 goroutine 2 [force gc (idle)]: runtime.gopark(0x4bb330, 0x54ab10, 0x1410, 0x1) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00004afb0 sp=0xc00004af90 pc=0x42a456 runtime.goparkunlock(...) /home/nickolai/tmp/go/src/runtime/proc.go:307 runtime.forcegchelper() /home/nickolai/tmp/go/src/runtime/proc.go:250 +0xb6 fp=0xc00004afe0 sp=0xc00004afb0 pc=0x42a306 runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00004afe8 sp=0xc00004afe0 pc=0x450f51 created by runtime.init.5 /home/nickolai/tmp/go/src/runtime/proc.go:239 +0x35 goroutine 3 [GC sweep wait]: runtime.gopark(0x4bb330, 0x54ac40, 0x140c, 0x1) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00004b7a8 sp=0xc00004b788 pc=0x42a456 runtime.goparkunlock(...) /home/nickolai/tmp/go/src/runtime/proc.go:307 runtime.bgsweep(0xc000022070) /home/nickolai/tmp/go/src/runtime/mgcsweep.go:89 +0x12d fp=0xc00004b7d8 sp=0xc00004b7a8 pc=0x41e97d runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00004b7e0 sp=0xc00004b7d8 pc=0x450f51 created by runtime.gcenable /home/nickolai/tmp/go/src/runtime/mgc.go:208 +0x58 goroutine 4 [finalizer wait]: runtime.gopark(0x4bb330, 0x565fc8, 0x140f, 0x1) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00004bf58 sp=0xc00004bf38 pc=0x42a456 runtime.goparkunlock(...) /home/nickolai/tmp/go/src/runtime/proc.go:307 runtime.runfinq() /home/nickolai/tmp/go/src/runtime/mfinal.go:175 +0xa5 fp=0xc00004bfe0 sp=0xc00004bf58 pc=0x415b45 runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00004bfe8 sp=0xc00004bfe0 pc=0x450f51 created by runtime.createfing /home/nickolai/tmp/go/src/runtime/mfinal.go:156 +0x61 goroutine 5 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc000612000, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00004a760 sp=0xc00004a740 pc=0x42a456 runtime.gcBgMarkWorker(0xc00002a000) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc00004a7d8 sp=0xc00004a760 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00004a7e0 sp=0xc00004a7d8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 34 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc00061e000, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00061a760 sp=0xc00061a740 pc=0x42a456 runtime.gcBgMarkWorker(0xc00002ea00) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc00061a7d8 sp=0xc00061a760 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00061a7e0 sp=0xc00061a7d8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 19 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc000612010, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc000046f60 sp=0xc000046f40 pc=0x42a456 runtime.gcBgMarkWorker(0xc000030f00) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc000046fd8 sp=0xc000046f60 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc000046fe0 sp=0xc000046fd8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 35 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc000612020, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00061af60 sp=0xc00061af40 pc=0x42a456 runtime.gcBgMarkWorker(0xc000033400) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc00061afd8 sp=0xc00061af60 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00061afe0 sp=0xc00061afd8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 36 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc000612030, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00061b760 sp=0xc00061b740 pc=0x42a456 runtime.gcBgMarkWorker(0xc000035900) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc00061b7d8 sp=0xc00061b760 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00061b7e0 sp=0xc00061b7d8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 37 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc00001c310, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00061bf60 sp=0xc00061bf40 pc=0x42a456 runtime.gcBgMarkWorker(0xc000038000) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc00061bfd8 sp=0xc00061bf60 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00061bfe0 sp=0xc00061bfd8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 goroutine 6 [GC worker (idle)]: runtime.gopark(0x4bb1f8, 0xc000612040, 0x1417, 0x0) /home/nickolai/tmp/go/src/runtime/proc.go:301 +0xe6 fp=0xc00004c760 sp=0xc00004c740 pc=0x42a456 runtime.gcBgMarkWorker(0xc00003a500) /home/nickolai/tmp/go/src/runtime/mgc.go:1731 +0xfc fp=0xc00004c7d8 sp=0xc00004c760 pc=0x41932c runtime.goexit() /home/nickolai/tmp/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc00004c7e0 sp=0xc00004c7d8 pc=0x450f51 created by runtime.gcBgMarkStartWorkers /home/nickolai/tmp/go/src/runtime/mgc.go:1679 +0x77 exit status 2 nickolai@kalahari:~/tmp/gobug2$ It takes a few tries without |
|
Does this trigger in 1.10 ? Is it worth trying to bisect ? |
|
The same bug shows up with go-1.10 and go-1.10.3. I didn't bother going back further. |
|
CC @aclements |
ianlancetaylor
added
NeedsInvestigation
|
On go 1.11, this version (no imports and no special flags) also produces the bug. Result -- |
|
I've poked at this a bit more, using Running with GOGC=1 simplifies the stack trace a bit by removing the number of GC workers. On my machine, the object is always at the same address. The first line of the output varies between The crash seems to always while growing the map in the I've tried making many small variations to the reproducer but they've all stopped reproducing after the change:
So it looks like there are very specific circumstances required to reproduce this crash. |
|
I bisected the latest reproducer from |
|
Reproducer from #29000 (comment) crashes all versions of Go up 1.7. And I can't test 1.6.4 since it can't be compiled on Mojave. |
|
My attempt at bisecting landed on 8607b2e . I wonder if the fact that it's not 100% reproducible is affecting the bisecting logic? |
Definitely. Probably need to loop a fair number of times before calling a commit good. |
|
And if this is sensitive to stack layout or optimizations or other fiddly toolchain details, looping might not even help. Might want to try also check as many different reproducers as you can. If that doesn't help, I would also consider focusing on changes that touch runtime/map*. We do lots of sketchy stuff there around GC and overflow buckets, and they have evolved non-trivially on every release. |
|
Updating to try 20 runs before failing also points to 21656d0 ; the previous commit didn't fail at 200 runs. |
|
Two maybe-helpful comments:
func allocstuff() {
m := make([]byte, 0)
for i := 0; i < 1000000; i++ {
m = append(m, 1)
}
}
|
|
Yes, my updated bisect script used as the check line. |
|
I'm able to reproduce with @zeldovich's example which imports "net", haven't been able to with newer ones. Looking a bit closer (and also looking at the above stack traces) the program is very consistently crashing when trying to mark in the GC following from a BSS value (an uninitialized global), and the only such value in this program is The pointer which gets written into This is all very bizarre. I'll keep investigating tomorrow and look into where exactly this object is allocated, which might help to answer some questions. |
|
Also odd: running the latest repro under delve changes it enough that for me it never crashes. |
|
There seems to be a bug with escape analysis, which concludes that the Z written to "saved" does not escape. Thus a pointer to a stack-allocated Z is written to "saved", a subsequent GC will shrink/free the stack, and the GC then observes a pointer to an unallocated span and panics. Using -gcflags="-m -m" supports this theory: the compiler concludes that the written Z does not escape. Without the recursive, dead-code call to f() in h(), the compiler correctly realizes that the Z escapes to the heap. Furthermore, the panic seems to go away when using GODEBUG="gcshrinkstackoff=1", presumably because the GC no longer finds a pointer to a free span. |
|
Oh yeah, good catch. It explains why the pointer doesn't seem to be in any size-segregated span. CC: @dr2chase @cherrymui |
mknyszek
changed the title
|
Interesting bug. It seems to need both
The code handling recursive functions are a lot more interesting. I'll take a careful look. |
|
The problem is that when analyzing the call, it iterates the formal parameters using |
|
Change https://golang.org/cl/152617 mentions this issue: |
Sign up for free
to subscribe to this conversation on GitHub.
Already have an account?
Sign in.
What version of Go are you using (
go version)?Does this issue reproduce with the latest release?
Yes.
What operating system and processor architecture are you using (
go env)?go envOutputWhat did you do?
$ cat bug_test.go package bug import ( "fmt" _ "net" "testing" ) type A struct { buf [32]byte } type Z struct { buf [256]byte } var saved interface{} func (a A) f(x interface{}) { switch x := x.(type) { case Z: a.g(x) } } func (a A) g(z Z) { a.h(a, z) } func (a A) h(_ A, x interface{}) { fmt.Printf("h\n") saved = x return a.f(x) } func w(i interface{}) { } func TestBug(t *testing.T) { big := make([]byte, 1024, 1024) big[0] = 1 var z Z z.buf[0] = 1 var a A a.f(z) m := make(map[int]int) for i := 0; i < 1000000; i++ { m[i] = i } } $ GOGC=1 go test . -v -count=1 === RUN TestBug h runtime: pointer 0xc0000bf640 to unallocated span span.base()=0xc0000b8000 span.limit=0xc0000c0000 span.state=3 runtime: found in object at *(0x630540+0x278) object=0x630540 s=nil fatal error: found bad pointer in Go heap (incorrect use of unsafe or cgo?) runtime stack: runtime.throw(0x547f29, 0x3e) /usr/local/go-1.11.2/src/runtime/panic.go:608 +0x72 fp=0x7fa12c91bc88 sp=0x7fa12c91bc58 pc=0x42ac12 runtime.findObject(0xc0000bf640, 0x630540, 0x278, 0x7fa130b09560, 0xc00002b770, 0xc) /usr/local/go-1.11.2/src/runtime/mbitmap.go:399 +0x3b6 fp=0x7fa12c91bcd8 sp=0x7fa12c91bc88 pc=0x412ed6 runtime.scanblock(0x630540, 0x1ce10, 0x7fa130b119e3, 0xc00002b770) /usr/local/go-1.11.2/src/runtime/mgcmark.go:1048 +0xa9 fp=0x7fa12c91bd30 sp=0x7fa12c91bcd8 pc=0x41dad9 runtime.markrootBlock(0x630540, 0x1ce10, 0x7fa130b119e3, 0xc00002b770, 0x0) /usr/local/go-1.11.2/src/runtime/mgcmark.go:294 +0x90 fp=0x7fa12c91bd60 sp=0x7fa12c91bd30 pc=0x41c0c0 runtime.markroot(0xc00002b770, 0xc000000003) /usr/local/go-1.11.2/src/runtime/mgcmark.go:200 +0x1a9 fp=0x7fa12c91bde0 sp=0x7fa12c91bd60 pc=0x41be69 runtime.gcDrain(0xc00002b770, 0x5) /usr/local/go-1.11.2/src/runtime/mgcmark.go:882 +0x117 fp=0x7fa12c91be38 sp=0x7fa12c91bde0 pc=0x41d4c7 runtime.gcBgMarkWorker.func2() /usr/local/go-1.11.2/src/runtime/mgc.go:1839 +0x80 fp=0x7fa12c91be78 sp=0x7fa12c91be38 pc=0x453cb0 runtime.systemstack(0x0) /usr/local/go-1.11.2/src/runtime/asm_amd64.s:351 +0x66 fp=0x7fa12c91be80 sp=0x7fa12c91be78 pc=0x455fb6 runtime.mstart() /usr/local/go-1.11.2/src/runtime/proc.go:1229 fp=0x7fa12c91be88 sp=0x7fa12c91be80 pc=0x42f4e0 goroutine 34 [GC worker (idle)]: runtime.systemstack_switch() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:311 fp=0xc000396760 sp=0xc000396758 pc=0x455f40 runtime.gcBgMarkWorker(0xc00002a500) /usr/local/go-1.11.2/src/runtime/mgc.go:1826 +0x1b8 fp=0xc0003967d8 sp=0xc000396760 pc=0x41a248 runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0003967e0 sp=0xc0003967d8 pc=0x458021 created by runtime.gcBgMarkStartWorkers /usr/local/go-1.11.2/src/runtime/mgc.go:1720 +0x77 goroutine 1 [chan receive]: runtime.gopark(0x548918, 0xc000088298, 0x170d, 0x3) /usr/local/go-1.11.2/src/runtime/proc.go:302 +0xeb fp=0xc00005bb58 sp=0xc00005bb38 pc=0x42c97b runtime.goparkunlock(0xc000088298, 0x170d, 0x3) /usr/local/go-1.11.2/src/runtime/proc.go:308 +0x53 fp=0xc00005bb88 sp=0xc00005bb58 pc=0x42ca23 runtime.chanrecv(0xc000088240, 0xc0000bdc9f, 0xc000000301, 0x4b3573) /usr/local/go-1.11.2/src/runtime/chan.go:520 +0x2be fp=0xc00005bc18 sp=0xc00005bb88 pc=0x4064ae runtime.chanrecv1(0xc000088240, 0xc0000bdc9f) /usr/local/go-1.11.2/src/runtime/chan.go:402 +0x2b fp=0xc00005bc48 sp=0xc00005bc18 pc=0x4061db testing.(*T).Run(0xc0000e2100, 0x53f83c, 0x7, 0x5484e8, 0x469a46) /usr/local/go-1.11.2/src/testing/testing.go:879 +0x37a fp=0xc00005bd00 sp=0xc00005bc48 pc=0x4b359a testing.runTests.func1(0xc0000e2000) /usr/local/go-1.11.2/src/testing/testing.go:1119 +0x78 fp=0xc00005bd50 sp=0xc00005bd00 pc=0x4b7268 testing.tRunner(0xc0000e2000, 0xc0000bde08) /usr/local/go-1.11.2/src/testing/testing.go:827 +0xbf fp=0xc00005bd78 sp=0xc00005bd50 pc=0x4b31bf testing.runTests(0xc0000ac060, 0x6296e0, 0x1, 0x1, 0x40c09f) /usr/local/go-1.11.2/src/testing/testing.go:1117 +0x2aa fp=0xc00005be38 sp=0xc00005bd78 pc=0x4b4a4a testing.(*M).Run(0xc0000e0000, 0x0) /usr/local/go-1.11.2/src/testing/testing.go:1034 +0x165 fp=0xc00005bf30 sp=0xc00005be38 pc=0x4b3995 main.main() _testmain.go:42 +0x13d fp=0xc00005bf98 sp=0xc00005bf30 pc=0x4f529d runtime.main() /usr/local/go-1.11.2/src/runtime/proc.go:201 +0x207 fp=0xc00005bfe0 sp=0xc00005bf98 pc=0x42c587 runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc00005bfe8 sp=0xc00005bfe0 pc=0x458021 goroutine 2 [force gc (idle)]: runtime.gopark(0x548918, 0x630f70, 0x1410, 0x1) /usr/local/go-1.11.2/src/runtime/proc.go:302 +0xeb fp=0xc000048f80 sp=0xc000048f60 pc=0x42c97b runtime.goparkunlock(0x630f70, 0x1410, 0x1) /usr/local/go-1.11.2/src/runtime/proc.go:308 +0x53 fp=0xc000048fb0 sp=0xc000048f80 pc=0x42ca23 runtime.forcegchelper() /usr/local/go-1.11.2/src/runtime/proc.go:251 +0xb3 fp=0xc000048fe0 sp=0xc000048fb0 pc=0x42c7f3 runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000048fe8 sp=0xc000048fe0 pc=0x458021 created by runtime.init.4 /usr/local/go-1.11.2/src/runtime/proc.go:240 +0x35 goroutine 3 [GC sweep wait]: runtime.gopark(0x548918, 0x6310e0, 0x45140c, 0x1) /usr/local/go-1.11.2/src/runtime/proc.go:302 +0xeb fp=0xc000049780 sp=0xc000049760 pc=0x42c97b runtime.goparkunlock(0x6310e0, 0x55140c, 0x1) /usr/local/go-1.11.2/src/runtime/proc.go:308 +0x53 fp=0xc0000497b0 sp=0xc000049780 pc=0x42ca23 runtime.bgsweep(0xc000020070) /usr/local/go-1.11.2/src/runtime/mgcsweep.go:71 +0x102 fp=0xc0000497d8 sp=0xc0000497b0 pc=0x41ef52 runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000497e0 sp=0xc0000497d8 pc=0x458021 created by runtime.gcenable /usr/local/go-1.11.2/src/runtime/mgc.go:216 +0x58 goroutine 18 [finalizer wait]: runtime.gopark(0x548918, 0x64d460, 0x140f, 0x1) /usr/local/go-1.11.2/src/runtime/proc.go:302 +0xeb fp=0xc000044728 sp=0xc000044708 pc=0x42c97b runtime.goparkunlock(0x64d460, 0x140f, 0x1) /usr/local/go-1.11.2/src/runtime/proc.go:308 +0x53 fp=0xc000044758 sp=0xc000044728 pc=0x42ca23 runtime.runfinq() /usr/local/go-1.11.2/src/runtime/mfinal.go:175 +0x99 fp=0xc0000447e0 sp=0xc000044758 pc=0x4168b9 runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000447e8 sp=0xc0000447e0 pc=0x458021 created by runtime.createfing /usr/local/go-1.11.2/src/runtime/mfinal.go:156 +0x61 goroutine 19 [runnable]: runtime.advanceEvacuationMark(0xc000056f68, 0x516840, 0x1000) /usr/local/go-1.11.2/src/runtime/map.go:1178 +0xd6 fp=0xc000056a70 sp=0xc000056a68 pc=0x40f546 runtime.evacuate_fast64(0x516840, 0xc000056f68, 0x562) /usr/local/go-1.11.2/src/runtime/map_fast64.go:417 +0x3f3 fp=0xc000056b18 sp=0xc000056a70 pc=0x4110a3 runtime.growWork_fast64(0x516840, 0xc000056f68, 0x14d4) /usr/local/go-1.11.2/src/runtime/map_fast64.go:321 +0x93 fp=0xc000056b40 sp=0xc000056b18 pc=0x410c93 runtime.mapassign_fast64(0x516840, 0xc000056f68, 0x6c9b, 0xc0002f3f70) /usr/local/go-1.11.2/src/runtime/map_fast64.go:115 +0x272 fp=0xc000056b80 sp=0xc000056b40 pc=0x4107e2 _/home/nickolai/tmp/gobug2.TestBug(0xc0000e2100) /home/nickolai/tmp/gobug2/bug_test.go:54 +0x157 fp=0xc000056fa8 sp=0xc000056b80 pc=0x4f5057 testing.tRunner(0xc0000e2100, 0x5484e8) /usr/local/go-1.11.2/src/testing/testing.go:827 +0xbf fp=0xc000056fd0 sp=0xc000056fa8 pc=0x4b31bf runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000056fd8 sp=0xc000056fd0 pc=0x458021 created by testing.(*T).Run /usr/local/go-1.11.2/src/testing/testing.go:878 +0x353 goroutine 20 [GC worker (idle)]: runtime.gopark(0x5487e0, 0xc0000140e0, 0xc000041417, 0x0) /usr/local/go-1.11.2/src/runtime/proc.go:302 +0xeb fp=0xc000048760 sp=0xc000048740 pc=0x42c97b runtime.gcBgMarkWorker(0xc000028000) /usr/local/go-1.11.2/src/runtime/mgc.go:1772 +0xfc fp=0xc0000487d8 sp=0xc000048760 pc=0x41a18c runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0000487e0 sp=0xc0000487d8 pc=0x458021 created by runtime.gcBgMarkStartWorkers /usr/local/go-1.11.2/src/runtime/mgc.go:1720 +0x77 goroutine 4 [GC worker (idle)]: runtime.gopark(0x5487e0, 0xc00009e2a0, 0x1417, 0x0) /usr/local/go-1.11.2/src/runtime/proc.go:302 +0xeb fp=0xc000049f60 sp=0xc000049f40 pc=0x42c97b runtime.gcBgMarkWorker(0xc00002ca00) /usr/local/go-1.11.2/src/runtime/mgc.go:1772 +0xfc fp=0xc000049fd8 sp=0xc000049f60 pc=0x41a18c runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000049fe0 sp=0xc000049fd8 pc=0x458021 created by runtime.gcBgMarkStartWorkers /usr/local/go-1.11.2/src/runtime/mgc.go:1720 +0x77 goroutine 35 [GC worker (idle)]: runtime.gopark(0x5487e0, 0xc00039c000, 0x1417, 0x0) /usr/local/go-1.11.2/src/runtime/proc.go:302 +0xeb fp=0xc000396f60 sp=0xc000396f40 pc=0x42c97b runtime.gcBgMarkWorker(0xc00002ef00) /usr/local/go-1.11.2/src/runtime/mgc.go:1772 +0xfc fp=0xc000396fd8 sp=0xc000396f60 pc=0x41a18c runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000396fe0 sp=0xc000396fd8 pc=0x458021 created by runtime.gcBgMarkStartWorkers /usr/local/go-1.11.2/src/runtime/mgc.go:1720 +0x77 goroutine 36 [GC worker (idle)]: runtime.gopark(0x5487e0, 0xc00009e2b0, 0x1417, 0x0) /usr/local/go-1.11.2/src/runtime/proc.go:302 +0xeb fp=0xc000397760 sp=0xc000397740 pc=0x42c97b runtime.gcBgMarkWorker(0xc000031400) /usr/local/go-1.11.2/src/runtime/mgc.go:1772 +0xfc fp=0xc0003977d8 sp=0xc000397760 pc=0x41a18c runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0003977e0 sp=0xc0003977d8 pc=0x458021 created by runtime.gcBgMarkStartWorkers /usr/local/go-1.11.2/src/runtime/mgc.go:1720 +0x77 goroutine 21 [GC worker (idle)]: runtime.gopark(0x5487e0, 0xc000014100, 0x1417, 0x0) /usr/local/go-1.11.2/src/runtime/proc.go:302 +0xeb fp=0xc000044f60 sp=0xc000044f40 pc=0x42c97b runtime.gcBgMarkWorker(0xc000033900) /usr/local/go-1.11.2/src/runtime/mgc.go:1772 +0xfc fp=0xc000044fd8 sp=0xc000044f60 pc=0x41a18c runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000044fe0 sp=0xc000044fd8 pc=0x458021 created by runtime.gcBgMarkStartWorkers /usr/local/go-1.11.2/src/runtime/mgc.go:1720 +0x77 goroutine 37 [GC worker (idle)]: runtime.gopark(0x5487e0, 0xc00039c010, 0x1417, 0x0) /usr/local/go-1.11.2/src/runtime/proc.go:302 +0xeb fp=0xc000397f60 sp=0xc000397f40 pc=0x42c97b runtime.gcBgMarkWorker(0xc000036000) /usr/local/go-1.11.2/src/runtime/mgc.go:1772 +0xfc fp=0xc000397fd8 sp=0xc000397f60 pc=0x41a18c runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc000397fe0 sp=0xc000397fd8 pc=0x458021 created by runtime.gcBgMarkStartWorkers /usr/local/go-1.11.2/src/runtime/mgc.go:1720 +0x77 goroutine 38 [GC worker (idle)]: runtime.gopark(0x5487e0, 0xc000014110, 0x1417, 0x0) /usr/local/go-1.11.2/src/runtime/proc.go:302 +0xeb fp=0xc000398760 sp=0xc000398740 pc=0x42c97b runtime.gcBgMarkWorker(0xc000038500) /usr/local/go-1.11.2/src/runtime/mgc.go:1772 +0xfc fp=0xc0003987d8 sp=0xc000398760 pc=0x41a18c runtime.goexit() /usr/local/go-1.11.2/src/runtime/asm_amd64.s:1333 +0x1 fp=0xc0003987e0 sp=0xc0003987d8 pc=0x458021 created by runtime.gcBgMarkStartWorkers /usr/local/go-1.11.2/src/runtime/mgc.go:1720 +0x77 FAIL _/home/nickolai/tmp/gobug2 0.018s $What did you expect to see?
No symptoms of runtime memory corruption.
What did you see instead?
Symptoms of runtime memory corruption.
The text was updated successfully, but these errors were encountered: