#!watchflakes
default <- `fatal error: s.allocCount != s.nelems && freeIndex == s.nelems`

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestScript/test_vet
=== PAUSE TestScript/test_vet
=== CONT  TestScript/test_vet
    script_test.go:139: 2025-07-07T20:41:38Z
    script_test.go:141: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1628678239/tmpdir224885965/test_vet3939172626
    script_test.go:163: 
        PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1628678239/tmpdir224885965/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin
        HOME=/no-home
        CCACHE_DISABLE=1
        GOARCH=arm64
...
        fatal error: s.allocCount != s.nelems && freeIndex == s.nelems

        goroutine 1 gp=0x140000041c0 m=3 mp=0x1400005b008 [running]:
        runtime.throw({0x100c740d8?, 0xc000000000001?})
            runtime/panic.go:1094 +0x34 fp=0x140040fee30 sp=0x140040fee00 pc=0x1004124c4
        runtime.(*mcache).nextFree(0x1017b0108, 0x4)
            runtime/malloc.go:966 +0x510 fp=0x140040feea0 sp=0x140040fee30 pc=0x1003a8d70
        runtime.mallocgcSmallScanNoHeader(...)
            runtime/malloc.go:1378
        runtime.mallocgc(0x10, 0x100eb4140, 0x1)
...
        runtime.gcBgMarkWorker(0x14001108700)
            runtime/mgc.go:1463 +0x18c fp=0x140003f8fb0 sp=0x140003f8f10 pc=0x1003b5afc
        runtime.gcBgMarkStartWorkers.gowrap1()
            runtime/mgc.go:1373 +0x28 fp=0x140003f8fd0 sp=0x140003f8fb0 pc=0x1003b5938
        runtime.goexit({})
            runtime/asm_arm64.s:1268 +0x4 fp=0x140003f8fd0 sp=0x140003f8fd0 pc=0x10041a0b4
        created by runtime.gcBgMarkStartWorkers in goroutine 1
            runtime/mgc.go:1373 +0x140
    script_test.go:163: FAIL: testdata/script/test_vet.txt:47: go test -a m/vetfail/p2: exit status 1
--- FAIL: TestScript/test_vet (8.90s)

— watchflakes

Comment From: gopherbot

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "cmd/go" && test == "TestScript/test_vet"
2025-07-07 20:13 gotip-darwin-arm64-longtest go@ef46e1b1 cmd/go.TestScript/test_vet (log) === RUN TestScript/test_vet === PAUSE TestScript/test_vet === CONT TestScript/test_vet script_test.go:139: 2025-07-07T20:41:38Z script_test.go:141: $WORK=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1628678239/tmpdir224885965/test_vet3939172626 script_test.go:163: PATH=/Users/swarming/.swarming/w/ir/x/t/cmd-go-test-1628678239/tmpdir224885965/testbin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/x/w/goroot/bin:/Users/swarming/.swarming/w/ir/cache/tools/bin:/Users/swarming/.swarming/w/ir/bbagent_utility_packages:/Users/swarming/.swarming/w/ir/bbagent_utility_packages/bin:/Users/swarming/.swarming/w/ir/cipd_bin_packages:/Users/swarming/.swarming/w/ir/cipd_bin_packages/bin:/Users/swarming/.swarming/w/ir/cache/cipd_client:/Users/swarming/.swarming/w/ir/cache/cipd_client/bin:/Users/swarming/.swarming/cipd_cache/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin HOME=/no-home CCACHE_DISABLE=1 GOARCH=arm64 ... fatal error: s.allocCount != s.nelems && freeIndex == s.nelems goroutine 1 gp=0x140000041c0 m=3 mp=0x1400005b008 [running]: runtime.throw({0x100c740d8?, 0xc000000000001?}) runtime/panic.go:1094 +0x34 fp=0x140040fee30 sp=0x140040fee00 pc=0x1004124c4 runtime.(*mcache).nextFree(0x1017b0108, 0x4) runtime/malloc.go:966 +0x510 fp=0x140040feea0 sp=0x140040fee30 pc=0x1003a8d70 runtime.mallocgcSmallScanNoHeader(...) runtime/malloc.go:1378 runtime.mallocgc(0x10, 0x100eb4140, 0x1) ... runtime.gcBgMarkWorker(0x14001108700) runtime/mgc.go:1463 +0x18c fp=0x140003f8fb0 sp=0x140003f8f10 pc=0x1003b5afc runtime.gcBgMarkStartWorkers.gowrap1() runtime/mgc.go:1373 +0x28 fp=0x140003f8fd0 sp=0x140003f8fb0 pc=0x1003b5938 runtime.goexit({}) runtime/asm_arm64.s:1268 +0x4 fp=0x140003f8fd0 sp=0x140003f8fd0 pc=0x10041a0b4 created by runtime.gcBgMarkStartWorkers in goroutine 1 runtime/mgc.go:1373 +0x140 script_test.go:163: FAIL: testdata/script/test_vet.txt:47: go test -a m/vetfail/p2: exit status 1 --- FAIL: TestScript/test_vet (8.90s)

— watchflakes

Comment From: cherrymui

This build also has a few weird failures, like the linker test failures, and the linker crash in cmd/nm test https://ci.chromium.org/ui/p/golang/builders/ci/gotip-darwin-arm64-longtest/b8709973248330130161/test-results

Maybe a bad builder state, file corruption or memory corruption?

Comment From: prattmic

This builder (https://chromium-swarm.appspot.com/bot?id=darwin-arm64-15--353dd9a9-6298-4153-8546-d5e904bf3abc.golang.c3.macservice.goog) almost always failed to even install Xcode due to checksum mismatches. It likely had some issue, but it's gone now anyway.