internal/coverage/cfile: TestCoverageApis/emitToFailingWriter failures

[gopherbot]

#!watchflakes
default <- pkg == "internal/coverage/cfile" && test == "TestCoverageApis/emitToFailingWriter"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestCoverageApis/emitToFailingWriter
=== PAUSE TestCoverageApis/emitToFailingWriter
=== CONT  TestCoverageApis/emitToFailingWriter
    emitdata_test.go:166: running: /home/swarming/.swarming/w/ir/x/t/TestCoverageApis2055472943/001/build1/harness.exe -tp emitToFailingWriter -o /home/swarming/.swarming/w/ir/x/t/TestCoverageApis2055472943/001/emitToFailingWriter-edir-y with rdir=/home/swarming/.swarming/w/ir/x/t/TestCoverageApis2055472943/001/emitToFailingWriter-rdir-y and GOCOVERDIR=false
    emitdata_test.go:166: running: /home/swarming/.swarming/w/ir/x/t/TestCoverageApis2055472943/001/build1/harness.exe -tp emitToFailingWriter -o /home/swarming/.swarming/w/ir/x/t/TestCoverageApis2055472943/001/emitToFailingWriter-edir-x with rdir=/home/swarming/.swarming/w/ir/x/t/TestCoverageApis2055472943/001/emitToFailingWriter-rdir-x and GOCOVERDIR=true
    emitdata_test.go:343: 
        internal error in coverage meta-data tracking:
        encountered bad pkgID: 0  at slot: 3484  fnID: 6  numCtrs: 1
        list of hard-coded runtime package IDs needs revising.
        [see the comment on the 'rtPkgs' var in 
...
        panic: runtime error: slice bounds out of range [:4294969857] with capacity 27250
        
        goroutine 1 gp=0x40000021c0 m=2 mp=0x400005a808 [running]:
        panic({0x2ad880?, 0x40000181f8?})
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:806 +0x578 fp=0x4000308930 sp=0x4000308880 pc=0x1a2c38
        runtime.goPanicSliceAcap(0x100000a01, 0x6a72)
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:141 +0xc4 fp=0x4000308970 sp=0x4000308930 pc=0xc9e44
        internal/coverage/cfile.(*emitState).VisitFuncs(0x400009e140, 0x400000c0f0)
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/internal/coverage/cfile/emit.go:478 +0x1564 fp=0x4000308be0 sp=0x4000308970 pc=0x26e874
        internal/coverage/encodecounter.(*CoverageDataWriter).writeCounters(0x4000010140, {0x2eb140, 0x400009e140}, 0x40000a0120)
...
        runtime.gcBgMarkWorker(0x40000240e0)
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgc.go:1363 +0x2b8 fp=0x4000051fb0 sp=0x4000051f10 pc=0x64198
        runtime.gcBgMarkStartWorkers.gowrap1()
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgc.go:1279 +0x28 fp=0x4000051fd0 sp=0x4000051fb0 pc=0x63ea8
        runtime.goexit({})
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1260 +0x4 fp=0x4000051fd0 sp=0x4000051fd0 pc=0x1b1924
        created by runtime.gcBgMarkStartWorkers in goroutine 1
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgc.go:1279 +0x3f4
    emitdata_test.go:344: running 'harness -tp emitToFailingWriter': exit status 2
--- FAIL: TestCoverageApis/emitToFailingWriter (0.17s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "internal/coverage/cfile" && test == "TestCoverageApis/emitToFailingWriter"

2024-10-25 21:42 gotip-linux-arm64-longtest go@46b576be internal/coverage/cfile.TestCoverageApis/emitToFailingWriter (log)

=== RUN   TestCoverageApis/emitToFailingWriter
=== PAUSE TestCoverageApis/emitToFailingWriter
=== CONT  TestCoverageApis/emitToFailingWriter
    emitdata_test.go:166: running: /home/swarming/.swarming/w/ir/x/t/TestCoverageApis2055472943/001/build1/harness.exe -tp emitToFailingWriter -o /home/swarming/.swarming/w/ir/x/t/TestCoverageApis2055472943/001/emitToFailingWriter-edir-y with rdir=/home/swarming/.swarming/w/ir/x/t/TestCoverageApis2055472943/001/emitToFailingWriter-rdir-y and GOCOVERDIR=false
    emitdata_test.go:166: running: /home/swarming/.swarming/w/ir/x/t/TestCoverageApis2055472943/001/build1/harness.exe -tp emitToFailingWriter -o /home/swarming/.swarming/w/ir/x/t/TestCoverageApis2055472943/001/emitToFailingWriter-edir-x with rdir=/home/swarming/.swarming/w/ir/x/t/TestCoverageApis2055472943/001/emitToFailingWriter-rdir-x and GOCOVERDIR=true
    emitdata_test.go:343: 
        internal error in coverage meta-data tracking:
        encountered bad pkgID: 0  at slot: 3484  fnID: 6  numCtrs: 1
        list of hard-coded runtime package IDs needs revising.
        [see the comment on the 'rtPkgs' var in 
...
        panic: runtime error: slice bounds out of range [:4294969857] with capacity 27250
        
        goroutine 1 gp=0x40000021c0 m=2 mp=0x400005a808 [running]:
        panic({0x2ad880?, 0x40000181f8?})
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:806 +0x578 fp=0x4000308930 sp=0x4000308880 pc=0x1a2c38
        runtime.goPanicSliceAcap(0x100000a01, 0x6a72)
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/panic.go:141 +0xc4 fp=0x4000308970 sp=0x4000308930 pc=0xc9e44
        internal/coverage/cfile.(*emitState).VisitFuncs(0x400009e140, 0x400000c0f0)
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/internal/coverage/cfile/emit.go:478 +0x1564 fp=0x4000308be0 sp=0x4000308970 pc=0x26e874
        internal/coverage/encodecounter.(*CoverageDataWriter).writeCounters(0x4000010140, {0x2eb140, 0x400009e140}, 0x40000a0120)
...
        runtime.gcBgMarkWorker(0x40000240e0)
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgc.go:1363 +0x2b8 fp=0x4000051fb0 sp=0x4000051f10 pc=0x64198
        runtime.gcBgMarkStartWorkers.gowrap1()
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgc.go:1279 +0x28 fp=0x4000051fd0 sp=0x4000051fb0 pc=0x63ea8
        runtime.goexit({})
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/asm_arm64.s:1260 +0x4 fp=0x4000051fd0 sp=0x4000051fd0 pc=0x1b1924
        created by runtime.gcBgMarkStartWorkers in goroutine 1
        	/home/swarming/.swarming/w/ir/x/w/goroot/src/runtime/mgc.go:1279 +0x3f4
    emitdata_test.go:344: running 'harness -tp emitToFailingWriter': exit status 2
--- FAIL: TestCoverageApis/emitToFailingWriter (0.17s)

— watchflakes