[delve/pkg/dwarf] panic: runtime error: slice bounds out of range

[amalavet]

For certain applications, Delve is panicking when I attempt to debug. This issue is only present for some of my go projects, some applications I can debug without issue.

1. What version of Delve are you using (dlv version)?

Delve Debugger
Version: 1.23.1
Build: $Id: 2eba762d75437d380e48fc42213853f13aa2904d $

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

go version go1.23.3 darwin/arm64

3. What operating system and processor architecture are you using?

darwin/arm64 (MacOS)

4. What did you do?

❯ dlv debug cmd/server/main.go

6. What did you expect to see?

Type 'help' for list of commands.
(dlv)

7. What did you see instead?

panic: runtime error: slice bounds out of range [74:0]

goroutine 7 [running]:
github.com/go-delve/delve/pkg/dwarf/line.parseIncludeDirs5(0x14003cc3810, 0x1400419d1a0)
        REDACTED/go/1.23.3/pkg/mod/github.com/go-delve/delve@v1.23.1/pkg/dwarf/line/line_parser.go:188 +0x460
github.com/go-delve/delve/pkg/dwarf/line.Parse({0x14006b3e630, 0xd}, 0x1400419d1a0, {0x0, 0x0, 0x0}, 0x0, 0x76c000, 0x0, 0x8)
        REDACTED/go/1.23.3/pkg/mod/github.com/go-delve/delve@v1.23.1/pkg/dwarf/line/line_parser.go:100 +0x23c
github.com/go-delve/delve/pkg/proc.(*BinaryInfo).loadDebugInfoMaps(0x1400023e000, 0x140016bc000, {0x14003c42000, 0x9b6289, 0x9b6289}, {0x14004768000, 0x6cf93a, 0x6cf93a}, 0x140016943c0, 0x14000242200)
        REDACTED/go/1.23.3/pkg/mod/github.com/go-delve/delve@v1.23.1/pkg/proc/bininfo.go:2478 +0x7a8
created by github.com/go-delve/delve/pkg/proc.loadBinaryInfoMacho in goroutine 1
        REDACTED/go/1.23.3/pkg/mod/github.com/go-delve/delve@v1.23.1/pkg/proc/bininfo.go:2017 +0x590

Also, here is my go env

GO111MODULE='on'
GOARCH='arm64'
GOBIN=''
GOCACHE='REDACTED/Library/Caches/go-build'
GOENV='REDACTED/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='REDACTED/go/1.23.3/pkg/mod'
GONOPROXY=''
GONOSUMDB=REDACTED
GOOS='darwin'
GOPATH='REDACTED/go/1.23.3'
GOPRIVATE=''
GOPROXY=REDACTED
GOROOT='REDACTED/.goenv/versions/1.23.3'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='REDACTED/.goenv/versions/1.23.3/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.23.3'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='REDACTED/Library/Application Support/go/telemetry'
GCCGO='gccgo'
GOARM64='v8.0'
AR='ar'
CC='/usr/local/bin/gcc'
CXX='/usr/bin/g++'
CGO_ENABLED='1'
GOMOD='REDACTED/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fmessage-length=0 -ffile-prefix-map=/var/folders/p2/r1fr92ns20dggzgnmv20w1p80000gn/T/go-build3234217224=/tmp/go-build -gno-record-gcc-switches -fno-common'

[amalavet]

I notice here that MacOS darwin/arm64 is not on the supported list. Could this be the issue, and if so, is there a plan to support Apple's M series of processors?

[amalavet]

Update, setting CGO_ENABLED=0 seems to provide a fix for projects that don't require it

[aarzilli]

Darwin/arm64 is supported. There is probably a bug in our implementation of DWARFv5, it would be very helpful if you could share the binary file that produces this error, even privately. Alternatively can you post the output of dlv debug --log --log-output=debugger ... as well as use go build -gcflags='all=-N -l' -o executable ... to compile and then run otool -l executable.

[amalavet]

Will send logs shortly

[amalavet]

Unfortunately, because the issue is occurring when debugging internal software at my company, I cannot provide anything beyond what I have already shared.

[aarzilli]

Not even the names of the sections returned by otool -l? I'd have to close this as not-reproducible.

[amalavet]

Let me check

[amalavet]

executablecmd/server/main.go:
Load command 0
      cmd LC_SEGMENT_64
  cmdsize 72
  segname __PAGEZERO
   vmaddr 0x0000000000000000
   vmsize 0x0000000100000000
  fileoff 0
 filesize 0
  maxprot 0x00000000
 initprot 0x00000000
   nsects 0
    flags 0x0
Load command 1
      cmd LC_SEGMENT_64
  cmdsize 552
  segname __TEXT
   vmaddr 0x0000000100000000
   vmsize 0x0000000001e84000
  fileoff 0
 filesize 31997952
  maxprot 0x00000005
 initprot 0x00000005
   nsects 6
    flags 0x0
Section
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   segname __TEXT
      addr 0x00000001000047a0
      size 0x0000000001879560
    offset 18336
     align 2^5 (32)
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     flags 0x80000400
 reserved1 0
 reserved2 0
Section
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   segname __TEXT
      addr 0x000000010187dd00
      size 0x0000000000000840
    offset 25681152
     align 2^2 (4)
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     flags 0x80000408
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Section
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   segname __TEXT
      addr 0x000000010187e540
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    offset 25683264
     align 2^5 (32)
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Section
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Section
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     align 2^4 (16)
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Section
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    offset 31983992
     align 2^3 (8)
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 reserved1 0
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Load command 2
      cmd LC_SEGMENT_64
  cmdsize 632
  segname __DATA_CONST
   vmaddr 0x0000000101e84000
   vmsize 0x0000000001048000
  fileoff 31997952
 filesize 17072128
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Section
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Section
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Section
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     align 2^3 (8)
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Section
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     align 2^5 (32)
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 reserved1 0
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Section
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Section
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Section
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Load command 3
      cmd LC_SEGMENT_64
  cmdsize 552
  segname __DATA
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  fileoff 49070080
 filesize 1703936
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Section
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Section
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   segname __DATA
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     align 2^4 (16)
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Section
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   segname __DATA
      addr 0x0000000102f0b420
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     align 2^5 (32)
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Section
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   segname __DATA
      addr 0x000000010306b080
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Section
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Section
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     align 2^3 (8)
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Load command 4
      cmd LC_SEGMENT_64
  cmdsize 72
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Load command 5
      cmd LC_DYLD_CHAINED_FIXUPS
  cmdsize 16
  dataoff 58441728
 datasize 4024
Load command 6
      cmd LC_DYLD_EXPORTS_TRIE
  cmdsize 16
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 datasize 3280
Load command 7
     cmd LC_SYMTAB
 cmdsize 24
  symoff 58546560
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Load command 8
            cmd LC_DYSYMTAB
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          cmd LC_LOAD_DYLINKER
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Load command 10
     cmd LC_UUID
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    uuid DBB859D1-3AC5-3987-C72A-0927B6872F4D
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      cmd LC_BUILD_VERSION
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 platform 1
    minos 15.0
      sdk n/a
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  version 1115.7.3
Load command 12
      cmd LC_SOURCE_VERSION
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  version 0.0
Load command 13
       cmd LC_MAIN
   cmdsize 24
  entryoff 545904
 stacksize 0
Load command 14
          cmd LC_LOAD_DYLIB
      cmdsize 56
         name /usr/lib/libresolv.9.dylib (offset 24)
   time stamp 2 Wed Dec 31 18:00:02 1969
      current version 1.0.0
compatibility version 1.0.0
Load command 15
          cmd LC_LOAD_DYLIB
      cmdsize 104
         name /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (offset 24)
   time stamp 2 Wed Dec 31 18:00:02 1969
      current version 3208.0.0
compatibility version 150.0.0
Load command 16
          cmd LC_LOAD_DYLIB
      cmdsize 96
         name /System/Library/Frameworks/Security.framework/Versions/A/Security (offset 24)
   time stamp 2 Wed Dec 31 18:00:02 1969
      current version 61439.60.117
compatibility version 1.0.0
Load command 17
          cmd LC_LOAD_DYLIB
      cmdsize 88
         name /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit (offset 24)
   time stamp 2 Wed Dec 31 18:00:02 1969
      current version 275.0.0
compatibility version 1.0.0
Load command 18
          cmd LC_LOAD_DYLIB
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         name /usr/lib/libSystem.B.dylib (offset 24)
   time stamp 2 Wed Dec 31 18:00:02 1969
      current version 1351.0.0
compatibility version 1.0.0
Load command 19
          cmd LC_RPATH
      cmdsize 32
         path @loader_path (offset 12)
Load command 20
          cmd LC_RPATH
      cmdsize 96
         path /opt/homebrew/Cellar/gcc/14.2.0_1/lib/gcc/current/gcc/aarch64-apple-darwin24/14 (offset 12)
Load command 21
          cmd LC_RPATH
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         path /opt/homebrew/Cellar/gcc/14.2.0_1/lib/gcc/current/gcc (offset 12)
Load command 22
          cmd LC_RPATH
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         path /opt/homebrew/Cellar/gcc/14.2.0_1/lib/gcc/current (offset 12)
Load command 23
      cmd LC_FUNCTION_STARTS
  cmdsize 16
  dataoff 58449032
 datasize 97528
Load command 24
      cmd LC_DATA_IN_CODE
  cmdsize 16
  dataoff 58546560
 datasize 0
Load command 25
      cmd LC_CODE_SIGNATURE
  cmdsize 16
  dataoff 63876016
 datasize 499154
Load command 26
      cmd LC_SEGMENT_64
  cmdsize 1032
  segname __DWARF
   vmaddr 0x0000000000000000
   vmsize 0x0000000000000000
  fileoff 50774016
 filesize 7665958
  maxprot 0x00000007
 initprot 0x00000000
   nsects 12
    flags 0x0
Section
  sectname __zdebug_line
   segname __DWARF
      addr 0x00000001035d8000
      size 0x0000000000112cd0
    offset 50774016
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
Section
  sectname __zdebug_loc
   segname __DWARF
      addr 0x00000001036eacd0
      size 0x00000000000d0f6c
    offset 51899600
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
Section
  sectname __zdebug_ranges
   segname __DWARF
      addr 0x00000001037bbc3c
      size 0x0000000000028219
    offset 52755516
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
Section
  sectname __zdebug_aranges
   segname __DWARF
      addr 0x00000001037e3e55
      size 0x0000000000002852
    offset 52919893
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
Section
  sectname __zdebug_info
   segname __DWARF
      addr 0x00000001037e66a7
      size 0x0000000000290026
    offset 52930215
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
Section
  sectname __zdebug_frame
   segname __DWARF
      addr 0x0000000103a766cd
      size 0x000000000008d53d
    offset 55617229
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
Section
  sectname __zdebug_abbrev
   segname __DWARF
      addr 0x0000000103b03c0a
      size 0x0000000000000314
    offset 56196106
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
Section
  sectname __zdebug_str
   segname __DWARF
      addr 0x0000000103b03f1e
      size 0x000000000009cbdd
    offset 56196894
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
Section
  sectname __zapple_names
   segname __DWARF
      addr 0x0000000103ba0afb
      size 0x00000000001078fa
    offset 56838907
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
Section
  sectname __apple_namespac
   segname __DWARF
      addr 0x0000000103ca83f5
      size 0x0000000000000024
    offset 57918453
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
Section
  sectname __zapple_types
   segname __DWARF
      addr 0x0000000103ca8419
      size 0x000000000007f4e9
    offset 57918489
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
Section
  sectname __apple_objc
   segname __DWARF
      addr 0x0000000103d27902
      size 0x0000000000000024
    offset 58439938
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0

[aarzilli]

It looks like the __zdebug_line_str has been stripped off by something, I wonder what, there might be other bugs with long section names and mach-o somewhere. Hard to know what's at fault without being able to reproduce it. Not delve's fault, however. Maybe go's linker, maybe LLVM.

[bradtgmurray]

I just noticed I'm hitting this error as well, which is breaking debugging in GoLand for me. If you need any additional information I'm happy to help.

[bradtgmurray]

go test -gcflags="all=-N -l" -c ./path/to/package -o out && otool -l out | grep debug -A 10

  sectname __zdebug_line
   segname __DWARF
      addr 0x0000000106ddf000
      size 0x00000000001d73d1
    offset 99237888
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
--
  sectname __zdebug_ranges
   segname __DWARF
      addr 0x0000000106fb63d1
      size 0x00000000000477b8
    offset 101168081
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
--
  sectname __zdebug_loc
   segname __DWARF
      addr 0x0000000106ffdb89
      size 0x00000000001d9163
    offset 101460873
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
--
  sectname __zdebug_aranges
   segname __DWARF
      addr 0x00000001071d6cec
      size 0x0000000000002b32
    offset 103398636
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
--
  sectname __zdebug_info
   segname __DWARF
      addr 0x00000001071d981e
      size 0x000000000054ef32
    offset 103409694
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
--
  sectname __zdebug_frame
   segname __DWARF
      addr 0x0000000107728750
      size 0x00000000000daf91
    offset 108975952
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
--
  sectname __zdebug_abbrev
   segname __DWARF
      addr 0x00000001078036e1
      size 0x00000000000007c4
    offset 109872865
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0
--
  sectname __zdebug_str
   segname __DWARF
      addr 0x0000000107803ea5
      size 0x000000000013cb41
    offset 109874853
     align 2^0 (1)
    reloff 0
    nreloc 0
     flags 0x00000000
 reserved1 0
 reserved2 0

$ go version
go version go1.23.2 darwin/arm64

$ which go
/opt/homebrew/bin/go