panic: unknown export format version 6 ("version 6")

[OneOfOne]

go version devel +49e3e436e7 2018-04-14 21:59:08 +0000 linux/amd64

[quasilyte]

Confirming this issue.

panic: unknown export format version 6 ("version 6")
1(runtime.call32): ~/go/src/runtime/asm_amd64.s:545
2(runtime.gopanic): ~/go/src/runtime/panic.go:494
3(main.(*gc_bin_parser).parse_export): ~/gotools/src/github.com/nsf/gocode/package_bin.go:126
4(main.(*package_file_cache).process_package_data): ~/gotools/src/github.com/nsf/gocode/package.go:132
5(main.(*package_file_cache).update_cache): ~/gotools/src/github.com/nsf/gocode/package.go:92
6(main.update_packages.func1): ~/gotools/src/github.com/nsf/gocode/autocompletecontext.go:455
7(runtime.goexit): ~/go/src/runtime/asm_amd64.s:1356

~/go is GOROOT.
~/gotools is GOPATH that is used for installed gocode.

[mattn]

please try @zchee's PR. #512

[quasilyte]

See $GOROOT/src/cmd/compile/internal/gc/bexport.go:

// Current export format version. Increase with each format change.
// 6: package height (CL 105038)
// 5: improved position encoding efficiency (issue 20080, CL 41619)
// 4: type name objects support type aliases, uses aliasTag
// 3: Go1.8 encoding (same as version 2, aliasTag defined but never used)
// 2: removed unused bool in ODCL export (compiler only)
// 1: header format change (more regular), export package for _ struct fields
// 0: Go1.7 encoding
const exportVersion = 6

git blame:
07029254 (Matthew Dempsky 2018-04-05 14:29:32 -0700 145) const exportVersion = 6

https://go-review.googlesource.com/105038

[quasilyte]

@mattn, I will, thanks.
Didn't know there is PR already.

[quasilyte]

PR fixes the problem on go tip.

[OneOfOne]

I can confirm the PR fixes the issue for me on go version devel +c63e047dac 2018-04-19 17:13:21 +0000 linux/amd64.

[fsouza]

Indeed that PR fixed the original issue for me, but now I'm seeing a different panic on go version devel +adb52cff58 Fri Apr 27 20:57:51 2018 +0000 darwin/amd64 😞

2018/04/28 12:55:01 -------------------------------------------------------
2018/04/28 12:55:01 Found "os" at "/Users/fsouza/.gimme/versions/go/pkg/darwin_amd64/os.a"
2018/04/28 12:55:01 Found "os/user" at "/Users/fsouza/.gimme/versions/go/pkg/darwin_amd64/os/user.a"
2018/04/28 12:55:01 Error parsing input file (inner block):
2018/04/28 12:55:01  8:8: expected selector or type assertion, found ';'
panic: unknown export format version -1 ("i\x00\xbe\x03\xfa\x02\x1d$GOROOT/src/os/user/lookup.go\x00\x04User\busername\x03uid\x04name\x05Group\x03gid\x1b$GOROOT/src/os/user/user.go\x03Uid\x03Gid\bUsername\x04Name\aHomeDir\bGroupIds\x01u\aesc:0x9\x05Error\x01e\x12UnknownUserIdError\x10UnknownUserError\aesc:0x1\x13user: unknown user \x13UnknownGroupIdError\x17group: unknown groupid \x11UnknownGroupError\x15group: unknown group \x0f<autogenerated>\x04user\aCurrent\x06Lookup\vLookupGroup\rLookupGroupId\bLookupId\x04init\x17UnknownGroupError.Error\x19UnknownGroupIdError.Error\x16UnknownUserError.Error\x00\x1f\x1e\x01 F\u007f\x14\x00\x00\x02\x00\x1e#\x00\x1e\x13\x1e\x00F\u007f8\x00\x01\x00$\x10\x02\x00\x1e#\x00\x1e\x13\x00\x1e\x1e\x00F\u007fJ\x00\x01\x00-\x10\x02\x00\x1e#\x00\x1e\x13\x00\x1e\x1e\x00\x006\x1e\x01YF\u007f\\\x00\x01\x001\x10\x02\x00\x1e\\\x00\x1e\x13\x00\x1e\x1e\x00F\u007fh\x00\x01\x00<\x10\x02\x00\x1e\\\x00\x1e\x13\x00\x1e\x1e\x00\a\x1e\x05\u007fD@\\\x10\x00\x1e")
1(runtime.call32): /Users/fsouza/.gimme/versions/go/src/runtime/asm_amd64.s:545
2(runtime.gopanic): /Users/fsouza/.gimme/versions/go/src/runtime/panic.go:494
3(main.(*gc_bin_parser).parse_export): /Users/fsouza/src/github.com/nsf/gocode/package_bin.go:126
4(main.(*package_file_cache).process_package_data): /Users/fsouza/src/github.com/nsf/gocode/package.go:132
5(main.(*package_file_cache).update_cache): /Users/fsouza/src/github.com/nsf/gocode/package.go:92
6(main.update_packages.func1): /Users/fsouza/src/github.com/nsf/gocode/autocompletecontext.go:455
7(runtime.goexit): /Users/fsouza/.gimme/versions/go/src/runtime/asm_amd64.s:1356

panic: One of the package cache updaters panicked
1(runtime.call32): /Users/fsouza/.gimme/versions/go/src/runtime/asm_amd64.s:545
2(runtime.gopanic): /Users/fsouza/.gimme/versions/go/src/runtime/panic.go:494
3(main.update_packages): /Users/fsouza/src/github.com/nsf/gocode/autocompletecontext.go:463
4(main.(*auto_complete_context).update_caches): /Users/fsouza/src/github.com/nsf/gocode/autocompletecontext.go:178
5(main.(*auto_complete_context).apropos): /Users/fsouza/src/github.com/nsf/gocode/autocompletecontext.go:360
6(main.server_auto_complete): /Users/fsouza/src/github.com/nsf/gocode/server.go:202
7(main.(*RPC).RPC_auto_complete): /Users/fsouza/src/github.com/nsf/gocode/rpc.go:26
8(runtime.call64): /Users/fsouza/.gimme/versions/go/src/runtime/asm_amd64.s:546
9(reflect.Value.call): /Users/fsouza/.gimme/versions/go/src/reflect/value.go:447
10(reflect.Value.Call): /Users/fsouza/.gimme/versions/go/src/reflect/value.go:308
11(net/rpc.(*service).call): /Users/fsouza/.gimme/versions/go/src/net/rpc/server.go:384
12(runtime.goexit): /Users/fsouza/.gimme/versions/go/src/runtime/asm_amd64.s:1356

panic: unknown export format version -1 ("i\x00\xf9.\xe0O\x15$GOROOT/src/os/env.go\x01s\amapping\x00\aesc:0x1\x03key\x05value\x17$GOROOT/src/os/error.go\x02Op\x04Path\x03Err\x05Error\x01e\tPathError\aTimeout\aesc:0x9\aSyscall\fSyscallError\asyscall\x03err\x16$GOROOT/src/os/exec.go\x03Pid\x06handle\x06isdone\x05sigMu\aRWMutex\x04sync\asetDone\x01p\aProcess\x04done\aRelease\x04Kill\x04Wait\fProcessState\x06Signal\x03sig\x1c$GOROOT/src/os/exec_posix.go\x04kill\x1b$GOROOT/src/os/exec_unix.go\x04wait\x02ps\x06signal\arelease\x1c$GOROOT/src/os/wait_unimp.go\x12blockUntilWaitable\x03Dir\x03Env\x05Files\x04File\x03Sys\vSysProcAttr\x06String\x03pid\x04name\x04argv\x04attr\bProcAttr\x06status")
1(runtime.call32): /Users/fsouza/.gimme/versions/go/src/runtime/asm_amd64.s:545
2(runtime.gopanic): /Users/fsouza/.gimme/versions/go/src/runtime/panic.go:494
3(main.(*gc_bin_parser).parse_export): /Users/fsouza/src/github.com/nsf/gocode/package_bin.go:126
4(main.(*package_file_cache).process_package_data): /Users/fsouza/src/github.com/nsf/gocode/package.go:132
5(main.(*package_file_cache).update_cache): /Users/fsouza/src/github.com/nsf/gocode/package.go:92
6(main.update_packages.func1): /Users/fsouza/src/github.com/nsf/gocode/autocompletecontext.go:455
7(runtime.goexit): /Users/fsouza/.gimme/versions/go/src/runtime/asm_amd64.s:1356

[quasilyte]

@fsouza, you're right. Thanks for details.
Mentioned pull request includes comments that refer to that problem.
#512 (comment)

The main options I see are:

• Do not checkout Go ca2f85fd3f32b2a4c863a2de602876bd31e9d956
• If you have to, use https://github.com/mdempsky/gocode/ until this is fixed