go: cmd/go: "runtime: cannot allocate memory" in workspaces with many non go files

What version of Go are you using (go version)?

$ go version
go version go1.19 linux/amd64

Does this issue reproduce with the latest release?

yes. No for go1.18.5.

What operating system and processor architecture are you using (go env)?

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/flehner/.cache/go-build"
GOENV="/home/flehner/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/flehner/go/pkg/mod"
GONOPROXY="github.com/optimyze"
GONOSUMDB="github.com/optimyze"
GOOS="linux"
GOPATH="/home/flehner/go"
GOPRIVATE="github.com/optimyze"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.19"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/dev/null"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3567430451=/tmp/go-build -gno-record-gcc-switches"

What did you do?

$ go mod tidy

What did you expect to see?

No changes at all or changes to go.mod and/or go.sum.

What did you see instead?

$ go version
go version go1.19 linux/amd64
$ go mod tidy
fatal error: runtime: cannot allocate memory

runtime stack:
runtime.throw({0xa35670?, 0xfffffffffffff800?})
	/usr/local/go/src/runtime/panic.go:1047 +0x5d fp=0x7f224d172d58 sp=0x7f224d172d28 pc=0x43765d
runtime.persistentalloc1(0x1018, 0x7f224d172dc0?, 0xe69838)
	/usr/local/go/src/runtime/malloc.go:1377 +0x24f fp=0x7f224d172da0 sp=0x7f224d172d58 pc=0x40f90f
runtime.persistentalloc.func1()
	/usr/local/go/src/runtime/malloc.go:1330 +0x2e fp=0x7f224d172dd0 sp=0x7f224d172da0 pc=0x40f68e
runtime.systemstack()
	/usr/local/go/src/runtime/asm_amd64.s:492 +0x49 fp=0x7f224d172dd8 sp=0x7f224d172dd0 pc=0x465e89

goroutine 53770 [running]:
runtime.systemstack_switch()
	/usr/local/go/src/runtime/asm_amd64.s:459 fp=0xc007c3f718 sp=0xc007c3f710 pc=0x465e20
runtime.persistentalloc(0x40?, 0xe69838?, 0xc007c3f748?)
	/usr/local/go/src/runtime/malloc.go:1329 +0x65 fp=0xc007c3f760 sp=0xc007c3f718 pc=0x40f605
runtime.(*spanSetBlockAlloc).alloc(0xa4?)
	/usr/local/go/src/runtime/mspanset.go:286 +0x76 fp=0xc007c3f788 sp=0xc007c3f760 pc=0x4322d6
runtime.(*spanSet).push(0xe5f2d8, 0x7f222bf2ff60)
	/usr/local/go/src/runtime/mspanset.go:124 +0x10c fp=0xc007c3f7e0 sp=0xc007c3f788 pc=0x431f4c
runtime.(*mcentral).uncacheSpan(0x2?, 0xc005299ec0?)
	/usr/local/go/src/runtime/mcentral.go:234 +0x8d fp=0xc007c3f808 sp=0xc007c3f7e0 pc=0x41942d
runtime.(*mcache).refill(0x7f22aef98a68, 0x1c)
	/usr/local/go/src/runtime/mcache.go:158 +0x9f fp=0xc007c3f848 sp=0xc007c3f808 pc=0x41895f
runtime.(*mcache).nextFree(0x7f22aef98a68, 0x1c)
	/usr/local/go/src/runtime/malloc.go:819 +0x85 fp=0xc007c3f890 sp=0xc007c3f848 pc=0x40e6e5
runtime.mallocgc(0xc0, 0xa09260, 0x1)
	/usr/local/go/src/runtime/malloc.go:1018 +0x4c8 fp=0xc007c3f908 sp=0xc007c3f890 pc=0x40ed48
runtime.newobject(0xc007115760?)
	/usr/local/go/src/runtime/malloc.go:1192 +0x27 fp=0xc007c3f930 sp=0xc007c3f908 pc=0x40f267
cmd/go/internal/modindex.importRaw({0xc000030004, 0x32}, {0xc006625f23, 0x71})
	/usr/local/go/src/cmd/go/internal/modindex/scan.go:217 +0x70a fp=0xc007c3fbc8 sp=0xc007c3f930 pc=0x7ddf8a
cmd/go/internal/modindex.indexPackage({0xc000030004, 0x32}, {0xc006625ef0, 0xa4})
	/usr/local/go/src/cmd/go/internal/modindex/scan.go:77 +0x6b fp=0xc007c3fc00 sp=0xc007c3fbc8 pc=0x7dd52b
cmd/go/internal/modindex.openIndexPackage.func1()
	/usr/local/go/src/cmd/go/internal/modindex/read.go:226 +0x134 fp=0xc007c3fd08 sp=0xc007c3fc00 pc=0x7d5df4
cmd/go/internal/par.(*Cache).Do(0xe32bc0, {0x97f3e0, 0xc004cdd000}, 0xc008badd90)
	/usr/local/go/src/cmd/go/internal/par/work.go:128 +0xc3 fp=0xc007c3fd50 sp=0xc007c3fd08 pc=0x5bb6e3
cmd/go/internal/modindex.openIndexPackage({0xc000030004, 0x32}, {0xc006625ef0, 0xa4})
	/usr/local/go/src/cmd/go/internal/modindex/read.go:216 +0xd0 fp=0xc007c3fdc8 sp=0xc007c3fd50 pc=0x7d5c50
cmd/go/internal/modindex.GetPackage({0xc000030004, 0x32}, {0xc006625ef0, 0xa4})
	/usr/local/go/src/cmd/go/internal/modindex/read.go:145 +0x156 fp=0xc007c3fe10 sp=0xc007c3fdc8 pc=0x7d5516
cmd/go/internal/modload.scanDir({0xc000030004?, 0x71ebc31?}, {0xc006625ef0, 0xa4}, 0x0?)
	/usr/local/go/src/cmd/go/internal/modload/load.go:2105 +0x4b fp=0xc007c3ff10 sp=0xc007c3fe10 pc=0x816d8b
cmd/go/internal/modload.matchPackages.func4.1.1()
	/usr/local/go/src/cmd/go/internal/modload/search.go:133 +0x4c fp=0xc007c3ff60 sp=0xc007c3ff10 pc=0x8290cc
cmd/go/internal/par.(*Queue).Add.func1()
	/usr/local/go/src/cmd/go/internal/par/queue.go:58 +0x7d fp=0xc007c3ffe0 sp=0xc007c3ff60 pc=0x5bad7d
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc007c3ffe8 sp=0xc007c3ffe0 pc=0x468041
created by cmd/go/internal/par.(*Queue).Add
	/usr/local/go/src/cmd/go/internal/par/queue.go:56 +0x225

goroutine 1 [runnable]:
syscall.Syscall6(0xc006648fd0?, 0xb0?, 0x7f22aef9a1d8?, 0xd0?, 0xc000100000?, 0xc005314b60?, 0x0?)
	/usr/local/go/src/syscall/syscall_linux.go:90 +0x36 fp=0xc0001d8420 sp=0xc0001d8398 pc=0x47e036
syscall.fstatat(0xc0001d84f8?, {0xc006648fd0?, 0x9c3b20?}, 0xc005314b98, 0x3?)
	/usr/local/go/src/syscall/zsyscall_linux_amd64.go:1439 +0x9a fp=0xc0001d8498 sp=0xc0001d8420 pc=0x47d41a
syscall.Lstat(...)
	/usr/local/go/src/syscall/syscall_linux_amd64.go:67
os.lstatNolog.func1(...)
	/usr/local/go/src/os/stat_unix.go:45
os.ignoringEINTR(...)
	/usr/local/go/src/os/file_posix.go:245
os.lstatNolog({0xc006648fd0, 0xb0})
	/usr/local/go/src/os/stat_unix.go:44 +0x5b fp=0xc0001d84e8 sp=0xc0001d8498 pc=0x4e045b
os.Lstat({0xc006648fd0, 0xb0})
	/usr/local/go/src/os/stat.go:22 +0x34 fp=0xc0001d8508 sp=0xc0001d84e8 pc=0x4dfe74
os.(*File).readdir(0xc0072e3600, 0xffffffffffffffff?, 0x2)
	/usr/local/go/src/os/dir_unix.go:128 +0x6fb fp=0xc0001d8628 sp=0xc0001d8508 pc=0x4d7f7b
os.(*File).Readdir(0xc007328d10?, 0xa4?)
	/usr/local/go/src/os/dir.go:41 +0x25 fp=0xc0001d8660 sp=0xc0001d8628 pc=0x4d7285
io/ioutil.ReadDir({0xc007328d10?, 0xc0001d8728?})
	/usr/local/go/src/io/ioutil/ioutil.go:74 +0x45 fp=0xc0001d86e0 sp=0xc0001d8660 pc=0x5946a5
cmd/go/internal/fsys.readDir({0xc007328d10, 0xa4})
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:297 +0x27 fp=0xc0001d8720 sp=0xc0001d86e0 pc=0x5982c7
cmd/go/internal/fsys.ReadDir({0xc007328d10, 0xa4})
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:322 +0x2c5 fp=0xc0001d8ab8 sp=0xc0001d8720 pc=0x5986e5
cmd/go/internal/fsys.walk({0xc007328d10, 0xa4}, {0xb2e510, 0xc005245ee0}, 0xc0001d9100)
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:471 +0xb8 fp=0xc0001d8b60 sp=0xc0001d8ab8 pc=0x5997d8
cmd/go/internal/fsys.walk({0xc00523ea00, 0x96}, {0xb2e510, 0xc005245d40}, 0xc0001d9100)
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:478 +0x1bc fp=0xc0001d8c08 sp=0xc0001d8b60 pc=0x5998dc
cmd/go/internal/fsys.walk({0xc005b6ea00, 0x7c}, {0xb2e510, 0xc004c429c0}, 0xc0001d9100)
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:478 +0x1bc fp=0xc0001d8cb0 sp=0xc0001d8c08 pc=0x5998dc
cmd/go/internal/fsys.walk({0xc002a10b60, 0x6a}, {0xb2e510, 0xc000513860}, 0xc0001d9100)
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:478 +0x1bc fp=0xc0001d8d58 sp=0xc0001d8cb0 pc=0x5998dc
cmd/go/internal/fsys.walk({0xc0002c1620, 0x51}, {0xb2e510, 0xc0003def70}, 0xc0001d9100)
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:478 +0x1bc fp=0xc0001d8e00 sp=0xc0001d8d58 pc=0x5998dc
cmd/go/internal/fsys.walk({0xc0004f4960, 0x49}, {0xb2e510, 0xc00038fd40}, 0xc0001d9100)
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:478 +0x1bc fp=0xc0001d8ea8 sp=0xc0001d8e00 pc=0x5998dc
cmd/go/internal/fsys.walk({0xc000217c80, 0x3e}, {0xb2e510, 0xc0002acea0}, 0xc0001d9100)
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:478 +0x1bc fp=0xc0001d8f50 sp=0xc0001d8ea8 pc=0x5998dc
cmd/go/internal/fsys.walk({0xc000030004, 0x32}, {0xb2e510, 0xc0002332b0}, 0xc0001d9100)
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:478 +0x1bc fp=0xc0001d8ff8 sp=0xc0001d8f50 pc=0x5998dc
cmd/go/internal/fsys.Walk({0xc000030004, 0x32}, 0xc0001d9100)
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:495 +0x94 fp=0xc0001d9048 sp=0xc0001d8ff8 pc=0x599a54
cmd/go/internal/modload.matchPackages.func4({0xc000030004, 0x32}, {0xc0001bc540, 0x1d}, 0x3)
	/usr/local/go/src/cmd/go/internal/modload/search.go:80 +0x231 fp=0xc0001d9180 sp=0xc0001d9048 pc=0x8285f1
cmd/go/internal/modload.matchPackages({0xb2d2d0?, 0xc000188000?}, 0xc00019e2a0, 0xc000215ec0, 0x0, {0xc0001adb20, 0x1, 0xc0002879b0?})
	/usr/local/go/src/cmd/go/internal/modload/search.go:209 +0xc0d fp=0xc0001d9460 sp=0xc0001d9180 pc=0x82808d
cmd/go/internal/modload.LoadPackages.func1(0xe34de0?, 0x0)
	/usr/local/go/src/cmd/go/internal/modload/load.go:324 +0x734 fp=0xc0001d95d8 sp=0xc0001d9460 pc=0x80cb34
cmd/go/internal/modload.LoadPackages.func2(0xc0002331e0?)
	/usr/local/go/src/cmd/go/internal/modload/load.go:351 +0x2c fp=0xc0001d9650 sp=0xc0001d95d8 pc=0x80c2ac
cmd/go/internal/modload.loadFromRoots({0xb2d2d0, 0xc000188000}, {{{0x0, 0x0}, 0xc000215ec0, 0x1, {0x0, 0x0}, 0x1, 0x1, ...}, ...})
	/usr/local/go/src/cmd/go/internal/modload/load.go:1066 +0x5f4 fp=0xc0001d99b0 sp=0xc0001d9650 pc=0x810474
cmd/go/internal/modload.LoadPackages({0xb2d2d0?, 0xc000188000}, {{0x0, 0x0}, 0xc000215ec0, 0x1, {0x0, 0x0}, 0x1, 0x1, ...}, ...)
	/usr/local/go/src/cmd/go/internal/modload/load.go:344 +0x308 fp=0xc0001d9c60 sp=0xc0001d99b0 pc=0x80b6e8
cmd/go/internal/modcmd.runTidy({0xb2d2d0, 0xc000188000}, 0xc0001ba4e0?, {0xc0001a2030?, 0x8?, 0x4?})
	/usr/local/go/src/cmd/go/internal/modcmd/tidy.go:114 +0x198 fp=0xc0001d9d88 sp=0xc0001d9c60 pc=0x90cf58
main.invoke(0xe269a0, {0xc0001a2020, 0x2, 0x2})
	/usr/local/go/src/cmd/go/main.go:225 +0x34e fp=0xc0001d9e60 sp=0xc0001d9d88 pc=0x9400ae
main.main()
	/usr/local/go/src/cmd/go/main.go:179 +0x7d1 fp=0xc0001d9f80 sp=0xc0001d9e60 pc=0x93fa31
runtime.main()
	/usr/local/go/src/runtime/proc.go:250 +0x212 fp=0xc0001d9fe0 sp=0xc0001d9f80 pc=0x439eb2
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc0001d9fe8 sp=0xc0001d9fe0 pc=0x468041

goroutine 2 [force gc (idle)]:
runtime.gopark(0x0?, 0x0?, 0x0?, 0x0?, 0x0?)
	/usr/local/go/src/runtime/proc.go:363 +0xd6 fp=0xc000060fb0 sp=0xc000060f90 pc=0x43a276
runtime.goparkunlock(...)
	/usr/local/go/src/runtime/proc.go:369
runtime.forcegchelper()
	/usr/local/go/src/runtime/proc.go:302 +0xad fp=0xc000060fe0 sp=0xc000060fb0 pc=0x43a10d
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc000060fe8 sp=0xc000060fe0 pc=0x468041
created by runtime.init.6
	/usr/local/go/src/runtime/proc.go:290 +0x25

goroutine 3 [GC sweep wait]:
runtime.gopark(0x1?, 0x0?, 0x0?, 0x0?, 0x0?)
	/usr/local/go/src/runtime/proc.go:363 +0xd6 fp=0xc000061790 sp=0xc000061770 pc=0x43a276
runtime.goparkunlock(...)
	/usr/local/go/src/runtime/proc.go:369
runtime.bgsweep(0x0?)
	/usr/local/go/src/runtime/mgcsweep.go:297 +0xd7 fp=0xc0000617c8 sp=0xc000061790 pc=0x426957
runtime.gcenable.func1()
	/usr/local/go/src/runtime/mgc.go:178 +0x26 fp=0xc0000617e0 sp=0xc0000617c8 pc=0x41b5c6
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc0000617e8 sp=0xc0000617e0 pc=0x468041
created by runtime.gcenable
	/usr/local/go/src/runtime/mgc.go:178 +0x6b

goroutine 4 [GC scavenge wait]:
runtime.gopark(0xe33680?, 0xb8f238?, 0x0?, 0x0?, 0x0?)
	/usr/local/go/src/runtime/proc.go:363 +0xd6 fp=0xc000061f70 sp=0xc000061f50 pc=0x43a276
runtime.goparkunlock(...)
	/usr/local/go/src/runtime/proc.go:369
runtime.(*scavengerState).park(0xe33680)
	/usr/local/go/src/runtime/mgcscavenge.go:389 +0x53 fp=0xc000061fa0 sp=0xc000061f70 pc=0x4249b3
runtime.bgscavenge(0x0?)
	/usr/local/go/src/runtime/mgcscavenge.go:622 +0x65 fp=0xc000061fc8 sp=0xc000061fa0 pc=0x424fa5
runtime.gcenable.func2()
	/usr/local/go/src/runtime/mgc.go:179 +0x26 fp=0xc000061fe0 sp=0xc000061fc8 pc=0x41b566
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc000061fe8 sp=0xc000061fe0 pc=0x468041
created by runtime.gcenable
	/usr/local/go/src/runtime/mgc.go:179 +0xaa

goroutine 18 [finalizer wait]:
runtime.gopark(0x0?, 0xa89728?, 0x0?, 0x0?, 0x2000000020?)
	/usr/local/go/src/runtime/proc.go:363 +0xd6 fp=0xc000060628 sp=0xc000060608 pc=0x43a276
runtime.goparkunlock(...)
	/usr/local/go/src/runtime/proc.go:369
runtime.runfinq()
	/usr/local/go/src/runtime/mfinal.go:180 +0x10f fp=0xc0000607e0 sp=0xc000060628 pc=0x41a6cf
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc0000607e8 sp=0xc0000607e0 pc=0x468041
created by runtime.createfing
	/usr/local/go/src/runtime/mfinal.go:157 +0x45

goroutine 53771 [runnable]:
runtime.convTstring({0xc0053a15c5?, 0x25?})
	/usr/local/go/src/runtime/iface.go:388 +0x89 fp=0xc008ba3ad8 sp=0xc008ba3ad0 pc=0x40cc29
cmd/go/internal/modindex.dirHash({0xc000030004, 0x32}, {0xc007328630, 0xa4})
	/usr/local/go/src/cmd/go/internal/modindex/read.go:116 +0x39f fp=0xc008ba3c00 sp=0xc008ba3ad8 pc=0x7d525f
cmd/go/internal/modindex.openIndexPackage.func1()
	/usr/local/go/src/cmd/go/internal/modindex/read.go:218 +0x85 fp=0xc008ba3d08 sp=0xc008ba3c00 pc=0x7d5d45
cmd/go/internal/par.(*Cache).Do(0xe32bc0, {0x97f3e0, 0xc004f3d520}, 0xc00809ed90)
	/usr/local/go/src/cmd/go/internal/par/work.go:128 +0xc3 fp=0xc008ba3d50 sp=0xc008ba3d08 pc=0x5bb6e3
cmd/go/internal/modindex.openIndexPackage({0xc000030004, 0x32}, {0xc007328630, 0xa4})
	/usr/local/go/src/cmd/go/internal/modindex/read.go:216 +0xd0 fp=0xc008ba3dc8 sp=0xc008ba3d50 pc=0x7d5c50
cmd/go/internal/modindex.GetPackage({0xc000030004, 0x32}, {0xc007328630, 0xa4})
	/usr/local/go/src/cmd/go/internal/modindex/read.go:145 +0x156 fp=0xc008ba3e10 sp=0xc008ba3dc8 pc=0x7d5516
cmd/go/internal/modload.scanDir({0xc000030004?, 0x0?}, {0xc007328630, 0xa4}, 0x0?)
	/usr/local/go/src/cmd/go/internal/modload/load.go:2105 +0x4b fp=0xc008ba3f10 sp=0xc008ba3e10 pc=0x816d8b
cmd/go/internal/modload.matchPackages.func4.1.1()
	/usr/local/go/src/cmd/go/internal/modload/search.go:133 +0x4c fp=0xc008ba3f60 sp=0xc008ba3f10 pc=0x8290cc
cmd/go/internal/par.(*Queue).Add.func1()
	/usr/local/go/src/cmd/go/internal/par/queue.go:58 +0x7d fp=0xc008ba3fe0 sp=0xc008ba3f60 pc=0x5bad7d
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc008ba3fe8 sp=0xc008ba3fe0 pc=0x468041
created by cmd/go/internal/par.(*Queue).Add
	/usr/local/go/src/cmd/go/internal/par/queue.go:56 +0x225

goroutine 116 [GC worker (idle)]:
runtime.gopark(0x8edbeb06ef8?, 0x3?, 0x5b?, 0x41?, 0x0?)
	/usr/local/go/src/runtime/proc.go:363 +0xd6 fp=0xc0005aef50 sp=0xc0005aef30 pc=0x43a276
runtime.gcBgMarkWorker()
	/usr/local/go/src/runtime/mgc.go:1235 +0xf1 fp=0xc0005aefe0 sp=0xc0005aef50 pc=0x41d711
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc0005aefe8 sp=0xc0005aefe0 pc=0x468041
created by runtime.gcBgMarkStartWorkers
	/usr/local/go/src/runtime/mgc.go:1159 +0x25

goroutine 115 [GC worker (idle)]:
runtime.gopark(0x8edccd76d83?, 0x3?, 0xe6?, 0x77?, 0x0?)
	/usr/local/go/src/runtime/proc.go:363 +0xd6 fp=0xc0005b0750 sp=0xc0005b0730 pc=0x43a276
runtime.gcBgMarkWorker()
	/usr/local/go/src/runtime/mgc.go:1235 +0xf1 fp=0xc0005b07e0 sp=0xc0005b0750 pc=0x41d711
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc0005b07e8 sp=0xc0005b07e0 pc=0x468041
created by runtime.gcBgMarkStartWorkers
	/usr/local/go/src/runtime/mgc.go:1159 +0x25

goroutine 99 [GC worker (idle)]:
runtime.gopark(0x8edccd78360?, 0x3?, 0x74?, 0x24?, 0x0?)
	/usr/local/go/src/runtime/proc.go:363 +0xd6 fp=0xc0005b0f50 sp=0xc0005b0f30 pc=0x43a276
runtime.gcBgMarkWorker()
	/usr/local/go/src/runtime/mgc.go:1235 +0xf1 fp=0xc0005b0fe0 sp=0xc0005b0f50 pc=0x41d711
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc0005b0fe8 sp=0xc0005b0fe0 pc=0x468041
created by runtime.gcBgMarkStartWorkers
	/usr/local/go/src/runtime/mgc.go:1159 +0x25

goroutine 98 [GC worker (idle)]:
runtime.gopark(0xe65800?, 0x3?, 0x33?, 0x90?, 0x0?)
	/usr/local/go/src/runtime/proc.go:363 +0xd6 fp=0xc0005b1f50 sp=0xc0005b1f30 pc=0x43a276
runtime.gcBgMarkWorker()
	/usr/local/go/src/runtime/mgc.go:1235 +0xf1 fp=0xc0005b1fe0 sp=0xc0005b1f50 pc=0x41d711
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc0005b1fe8 sp=0xc0005b1fe0 pc=0x468041
created by runtime.gcBgMarkStartWorkers
	/usr/local/go/src/runtime/mgc.go:1159 +0x25

goroutine 114 [GC worker (idle)]:
runtime.gopark(0x8edccd781e2?, 0x1?, 0x81?, 0x5b?, 0x0?)
	/usr/local/go/src/runtime/proc.go:363 +0xd6 fp=0xc0005aa750 sp=0xc0005aa730 pc=0x43a276
runtime.gcBgMarkWorker()
	/usr/local/go/src/runtime/mgc.go:1235 +0xf1 fp=0xc0005aa7e0 sp=0xc0005aa750 pc=0x41d711
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc0005aa7e8 sp=0xc0005aa7e0 pc=0x468041
created by runtime.gcBgMarkStartWorkers
	/usr/local/go/src/runtime/mgc.go:1159 +0x25

goroutine 130 [GC worker (idle)]:
runtime.gopark(0x8eda8166fa7?, 0x3?, 0x51?, 0x36?, 0x0?)
	/usr/local/go/src/runtime/proc.go:363 +0xd6 fp=0xc0005aaf50 sp=0xc0005aaf30 pc=0x43a276
runtime.gcBgMarkWorker()
	/usr/local/go/src/runtime/mgc.go:1235 +0xf1 fp=0xc0005aafe0 sp=0xc0005aaf50 pc=0x41d711
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc0005aafe8 sp=0xc0005aafe0 pc=0x468041
created by runtime.gcBgMarkStartWorkers
	/usr/local/go/src/runtime/mgc.go:1159 +0x25

goroutine 93 [GC worker (idle)]:
runtime.gopark(0x8edccd7780d?, 0x3?, 0xde?, 0x44?, 0x0?)
	/usr/local/go/src/runtime/proc.go:363 +0xd6 fp=0xc0005ab750 sp=0xc0005ab730 pc=0x43a276
runtime.gcBgMarkWorker()
	/usr/local/go/src/runtime/mgc.go:1235 +0xf1 fp=0xc0005ab7e0 sp=0xc0005ab750 pc=0x41d711
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc0005ab7e8 sp=0xc0005ab7e0 pc=0x468041
created by runtime.gcBgMarkStartWorkers
	/usr/local/go/src/runtime/mgc.go:1159 +0x25

goroutine 94 [GC worker (idle)]:
runtime.gopark(0x8edcc577f9b?, 0x1?, 0xb6?, 0x49?, 0x0?)
	/usr/local/go/src/runtime/proc.go:363 +0xd6 fp=0xc0005abf50 sp=0xc0005abf30 pc=0x43a276
runtime.gcBgMarkWorker()
	/usr/local/go/src/runtime/mgc.go:1235 +0xf1 fp=0xc0005abfe0 sp=0xc0005abf50 pc=0x41d711
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc0005abfe8 sp=0xc0005abfe0 pc=0x468041
created by runtime.gcBgMarkStartWorkers
	/usr/local/go/src/runtime/mgc.go:1159 +0x25

goroutine 53772 [runnable]:
runtime.gcTrigger.test({0x0?, 0x0?, 0x0?})
	/usr/local/go/src/runtime/mgc.go:548 +0xfc fp=0xc008ba7490 sp=0xc008ba7488 pc=0x41b9bc
runtime.mallocgc(0xa5, 0x0, 0x0)
	/usr/local/go/src/runtime/malloc.go:1137 +0x7fd fp=0xc008ba7508 sp=0xc008ba7490 pc=0x40f07d
runtime.makeslicecopy(0xc007328d10?, 0xa4?, 0x994400?, 0xc007328d10)
	/usr/local/go/src/runtime/slice.go:57 +0x89 fp=0xc008ba7550 sp=0xc008ba7508 pc=0x44e669
syscall.ByteSliceFromString({0xc007328d10, 0xa4})
	/usr/local/go/src/syscall/syscall.go:52 +0x8e fp=0xc008ba7588 sp=0xc008ba7550 pc=0x47842e
syscall.BytePtrFromString(...)
	/usr/local/go/src/syscall/syscall.go:68
syscall.openat(0xc0083b6000?, {0xc007328d10?, 0x0?}, 0x0?, 0x0)
	/usr/local/go/src/syscall/zsyscall_linux_amd64.go:64 +0x3c fp=0xc008ba7600 sp=0xc008ba7588 pc=0x47ac7c
syscall.Open(...)
	/usr/local/go/src/syscall/syscall_linux.go:232
os.openFileNolog({0xc007328d10, 0xa4}, 0x0, 0x0)
	/usr/local/go/src/os/file_unix.go:216 +0x9b fp=0xc008ba7648 sp=0xc008ba7600 pc=0x4dd83b
os.OpenFile({0xc007328d10, 0xa4}, 0x0, 0x72be5d74?)
	/usr/local/go/src/os/file.go:337 +0x45 fp=0xc008ba7680 sp=0xc008ba7648 pc=0x4db685
os.Open(...)
	/usr/local/go/src/os/file.go:317
io/ioutil.ReadDir({0xc007328d10?, 0x0?})
	/usr/local/go/src/io/ioutil/ioutil.go:70 +0x29 fp=0xc008ba7700 sp=0xc008ba7680 pc=0x594689
cmd/go/internal/fsys.readDir({0xc007328d10, 0xa4})
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:297 +0x27 fp=0xc008ba7740 sp=0xc008ba7700 pc=0x5982c7
cmd/go/internal/fsys.ReadDir({0xc007328d10, 0xa4})
	/usr/local/go/src/cmd/go/internal/fsys/fsys.go:322 +0x2c5 fp=0xc008ba7ad8 sp=0xc008ba7740 pc=0x5986e5
cmd/go/internal/modindex.dirHash({0xc000030004, 0x32}, {0xc007328d10, 0xa4})
	/usr/local/go/src/cmd/go/internal/modindex/read.go:90 +0x1a8 fp=0xc008ba7c00 sp=0xc008ba7ad8 pc=0x7d5068
cmd/go/internal/modindex.openIndexPackage.func1()
	/usr/local/go/src/cmd/go/internal/modindex/read.go:218 +0x85 fp=0xc008ba7d08 sp=0xc008ba7c00 pc=0x7d5d45
cmd/go/internal/par.(*Cache).Do(0xe32bc0, {0x97f3e0, 0xc0049b5640}, 0xc008ba9d90)
	/usr/local/go/src/cmd/go/internal/par/work.go:128 +0xc3 fp=0xc008ba7d50 sp=0xc008ba7d08 pc=0x5bb6e3
cmd/go/internal/modindex.openIndexPackage({0xc000030004, 0x32}, {0xc007328d10, 0xa4})
	/usr/local/go/src/cmd/go/internal/modindex/read.go:216 +0xd0 fp=0xc008ba7dc8 sp=0xc008ba7d50 pc=0x7d5c50
cmd/go/internal/modindex.GetPackage({0xc000030004, 0x32}, {0xc007328d10, 0xa4})
	/usr/local/go/src/cmd/go/internal/modindex/read.go:145 +0x156 fp=0xc008ba7e10 sp=0xc008ba7dc8 pc=0x7d5516
cmd/go/internal/modload.scanDir({0xc000030004?, 0x0?}, {0xc007328d10, 0xa4}, 0x0?)
	/usr/local/go/src/cmd/go/internal/modload/load.go:2105 +0x4b fp=0xc008ba7f10 sp=0xc008ba7e10 pc=0x816d8b
cmd/go/internal/modload.matchPackages.func4.1.1()
	/usr/local/go/src/cmd/go/internal/modload/search.go:133 +0x4c fp=0xc008ba7f60 sp=0xc008ba7f10 pc=0x8290cc
cmd/go/internal/par.(*Queue).Add.func1()
	/usr/local/go/src/cmd/go/internal/par/queue.go:58 +0x7d fp=0xc008ba7fe0 sp=0xc008ba7f60 pc=0x5bad7d
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc008ba7fe8 sp=0xc008ba7fe0 pc=0x468041
created by cmd/go/internal/par.(*Queue).Add
	/usr/local/go/src/cmd/go/internal/par/queue.go:56 +0x225

goroutine 53768 [runnable]:
crypto/sha256.(*digest).Sum(0xc007309a00, {0xc001197b20, 0x0, 0x20})
	/usr/local/go/src/crypto/sha256/sha256.go:215 +0x205 fp=0xc001197ab8 sp=0xc001197ab0 pc=0x5aa105
cmd/go/internal/cache.(*Cache).put(0x100?, {0x17, 0x7b, 0x65, 0xb8, 0xeb, 0x70, 0x1, 0x49, 0x93, ...}, ...)
	/usr/local/go/src/cmd/go/internal/cache/cache.go:454 +0x125 fp=0xc001197b68 sp=0xc001197ab8 pc=0x7c86e5
cmd/go/internal/cache.(*Cache).Put(...)
	/usr/local/go/src/cmd/go/internal/cache/cache.go:432
cmd/go/internal/cache.(*Cache).PutBytes(0x0?, {0x17, 0x7b, 0x65, 0xb8, 0xeb, 0x70, 0x1, 0x49, 0x93, ...}, ...)
	/usr/local/go/src/cmd/go/internal/cache/cache.go:467 +0xd7 fp=0xc001197c00 sp=0xc001197b68 pc=0x7c8937
cmd/go/internal/modindex.openIndexPackage.func1()
	/usr/local/go/src/cmd/go/internal/modindex/read.go:227 +0x1ad fp=0xc001197d08 sp=0xc001197c00 pc=0x7d5e6d
cmd/go/internal/par.(*Cache).Do(0xe32bc0, {0x97f3e0, 0xc00476b6c0}, 0xc00118dd90)
	/usr/local/go/src/cmd/go/internal/par/work.go:128 +0xc3 fp=0xc001197d50 sp=0xc001197d08 pc=0x5bb6e3
cmd/go/internal/modindex.openIndexPackage({0xc000030004, 0x32}, {0xc006624fd0, 0xa3})
	/usr/local/go/src/cmd/go/internal/modindex/read.go:216 +0xd0 fp=0xc001197dc8 sp=0xc001197d50 pc=0x7d5c50
cmd/go/internal/modindex.GetPackage({0xc000030004, 0x32}, {0xc006624fd0, 0xa3})
	/usr/local/go/src/cmd/go/internal/modindex/read.go:145 +0x156 fp=0xc001197e10 sp=0xc001197dc8 pc=0x7d5516
cmd/go/internal/modload.scanDir({0xc000030004?, 0x0?}, {0xc006624fd0, 0xa3}, 0x0?)
	/usr/local/go/src/cmd/go/internal/modload/load.go:2105 +0x4b fp=0xc001197f10 sp=0xc001197e10 pc=0x816d8b
cmd/go/internal/modload.matchPackages.func4.1.1()
	/usr/local/go/src/cmd/go/internal/modload/search.go:133 +0x4c fp=0xc001197f60 sp=0xc001197f10 pc=0x8290cc
cmd/go/internal/par.(*Queue).Add.func1()
	/usr/local/go/src/cmd/go/internal/par/queue.go:58 +0x7d fp=0xc001197fe0 sp=0xc001197f60 pc=0x5bad7d
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc001197fe8 sp=0xc001197fe0 pc=0x468041
created by cmd/go/internal/par.(*Queue).Add
	/usr/local/go/src/cmd/go/internal/par/queue.go:56 +0x225

goroutine 53767 [runnable]:
syscall.Syscall6(0xc00083e7e0?, 0x63?, 0xa213c0?, 0x1?, 0xc008c8b850?, 0x7c5596?, 0xc008c8b820?)
	/usr/local/go/src/syscall/syscall_linux.go:90 +0x36 fp=0xc008c8b768 sp=0xc008c8b6e0 pc=0x47e036
syscall.openat(0xc5a49cac09d2a755?, {0xc00083e7e0?, 0x59e063a007cb5063?}, 0xc004179fe0?, 0x1b6)
	/usr/local/go/src/syscall/zsyscall_linux_amd64.go:68 +0x94 fp=0xc008c8b7e0 sp=0xc008c8b768 pc=0x47acd4
syscall.Open(...)
	/usr/local/go/src/syscall/syscall_linux.go:232
os.openFileNolog({0xc00083e7e0, 0x63}, 0x41, 0x1b6)
	/usr/local/go/src/os/file_unix.go:216 +0x9b fp=0xc008c8b828 sp=0xc008c8b7e0 pc=0x4dd83b
os.OpenFile({0xc00083e7e0, 0x63}, 0x41, 0x7cb5063?)
	/usr/local/go/src/os/file.go:337 +0x45 fp=0xc008c8b860 sp=0xc008c8b828 pc=0x4db685
cmd/go/internal/cache.(*Cache).putIndexEntry(0xc000128150, {0x99, 0xff, 0x4f, 0x35, 0x51, 0x18, 0x27, 0x34, 0x55, ...}, ...)
	/usr/local/go/src/cmd/go/internal/cache/cache.go:400 +0x397 fp=0xc008c8bab8 sp=0xc008c8b860 pc=0x7c8237
cmd/go/internal/cache.(*Cache).put(0x100?, {0x99, 0xff, 0x4f, 0x35, 0x51, 0x18, 0x27, 0x34, 0x55, ...}, ...)
	/usr/local/go/src/cmd/go/internal/cache/cache.go:462 +0x1d8 fp=0xc008c8bb68 sp=0xc008c8bab8 pc=0x7c8798
cmd/go/internal/cache.(*Cache).Put(...)
	/usr/local/go/src/cmd/go/internal/cache/cache.go:432
cmd/go/internal/cache.(*Cache).PutBytes(0x0?, {0x99, 0xff, 0x4f, 0x35, 0x51, 0x18, 0x27, 0x34, 0x55, ...}, ...)
	/usr/local/go/src/cmd/go/internal/cache/cache.go:467 +0xd7 fp=0xc008c8bc00 sp=0xc008c8bb68 pc=0x7c8937
cmd/go/internal/modindex.openIndexPackage.func1()
	/usr/local/go/src/cmd/go/internal/modindex/read.go:227 +0x1ad fp=0xc008c8bd08 sp=0xc008c8bc00 pc=0x7d5e6d
cmd/go/internal/par.(*Cache).Do(0xe32bc0, {0x97f3e0, 0xc005028940}, 0xc00809fd90)
	/usr/local/go/src/cmd/go/internal/par/work.go:128 +0xc3 fp=0xc008c8bd50 sp=0xc008c8bd08 pc=0x5bb6e3
cmd/go/internal/modindex.openIndexPackage({0xc000030004, 0x32}, {0xc0066248f0, 0xa4})
	/usr/local/go/src/cmd/go/internal/modindex/read.go:216 +0xd0 fp=0xc008c8bdc8 sp=0xc008c8bd50 pc=0x7d5c50
cmd/go/internal/modindex.GetPackage({0xc000030004, 0x32}, {0xc0066248f0, 0xa4})
	/usr/local/go/src/cmd/go/internal/modindex/read.go:145 +0x156 fp=0xc008c8be10 sp=0xc008c8bdc8 pc=0x7d5516
cmd/go/internal/modload.scanDir({0xc000030004?, 0x0?}, {0xc0066248f0, 0xa4}, 0x0?)
	/usr/local/go/src/cmd/go/internal/modload/load.go:2105 +0x4b fp=0xc008c8bf10 sp=0xc008c8be10 pc=0x816d8b
cmd/go/internal/modload.matchPackages.func4.1.1()
	/usr/local/go/src/cmd/go/internal/modload/search.go:133 +0x4c fp=0xc008c8bf60 sp=0xc008c8bf10 pc=0x8290cc
cmd/go/internal/par.(*Queue).Add.func1()
	/usr/local/go/src/cmd/go/internal/par/queue.go:58 +0x7d fp=0xc008c8bfe0 sp=0xc008c8bf60 pc=0x5bad7d
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1594 +0x1 fp=0xc008c8bfe8 sp=0xc008c8bfe0 pc=0x468041
created by cmd/go/internal/par.(*Queue).Add
	/usr/local/go/src/cmd/go/internal/par/queue.go:56 +0x225

Findings

With GODEBUG=gofsystrace=1 I was able to trace down the issue. The repository in question contains a lot of non Go files and go mod tidy parses them all. Moving these files into a directory with the prefix _ resolves this issue - but I think this might be more a workaround for this particular case. Unfortunately this happens on a non-public repository, so I can’t share it directly.