runtime: GDB tests failing on linux-mips64-rtrk since CL 380755

[bcmills]

--- FAIL: TestGdbBacktrace (1.30s)
    runtime-gdb_test.go:76: gdb version 8.1
    runtime-gdb_test.go:428: gdb output:
        BFD: /tmp/gobuilder-mips64/tmp/TestGdbBacktrace2309338065/001/a.exe: unable to initialize decompress status for section .debug_abbrev
        BFD: /tmp/gobuilder-mips64/tmp/TestGdbBacktrace2309338065/001/a.exe: unable to initialize decompress status for section .debug_abbrev
        "/tmp/gobuilder-mips64/tmp/TestGdbBacktrace2309338065/001/a.exe": not in executable format: File format not recognized
        No symbol table is loaded.  Use the "file" command.
        Make breakpoint pending on future shared library load? (y or [n]) [answered N; input not from terminal]
        No executable file specified.
        Use the "file" or "exec-file" command.
        No stack.
        The program is not being run.
    runtime-gdb_test.go:454: could not find '#0.*main\.eee' in backtrace
--- FAIL: TestGdbPanic (2.48s)
    runtime-gdb_test.go:76: gdb version 8.1
    runtime-gdb_test.go:636: gdb output:
        BFD: /tmp/gobuilder-mips64/tmp/TestGdbPanic797438989/001/a.exe: unable to initialize decompress status for section .debug_abbrev
        BFD: /tmp/gobuilder-mips64/tmp/TestGdbPanic797438989/001/a.exe: unable to initialize decompress status for section .debug_abbrev
        "/tmp/gobuilder-mips64/tmp/TestGdbPanic797438989/001/a.exe": not in executable format: File format not recognized
        No executable file specified.
        Use the "file" or "exec-file" command.
        No stack.
    runtime-gdb_test.go:650: could not find '(#.* .* in )?main\.crash' in backtrace
--- FAIL: TestGdbConst (20.83s)
    runtime-gdb_test.go:76: gdb version 8.1
    runtime-gdb_test.go:578: gdb output:
        BFD: /tmp/gobuilder-mips64/tmp/TestGdbConst1900233325/001/a.exe: unable to initialize decompress status for section .debug_abbrev
        BFD: /tmp/gobuilder-mips64/tmp/TestGdbConst1900233325/001/a.exe: unable to initialize decompress status for section .debug_abbrev
        "/tmp/gobuilder-mips64/tmp/TestGdbConst1900233325/001/a.exe": not in executable format: File format not recognized
        No symbol table is loaded.  Use the "file" command.
        Make breakpoint pending on future shared library load? (y or [n]) [answered N; input not from terminal]
        No executable file specified.
        Use the "file" or "exec-file" command.
        No symbol table is loaded.  Use the "file" command.
        No symbol table is loaded.  Use the "file" command.
        No symbol table is loaded.  Use the "file" command.
        No symbol table is loaded.  Use the "file" command.
        No symbol table is loaded.  Use the "file" command.
    runtime-gdb_test.go:586: output mismatch
--- FAIL: TestGdbAutotmpTypes (18.97s)
    runtime-gdb_test.go:76: gdb version 8.1
    runtime-gdb_test.go:510: gdb output:
        BFD: /tmp/gobuilder-mips64/tmp/TestGdbAutotmpTypes830246952/001/a.exe: unable to initialize decompress status for section .debug_abbrev
        BFD: /tmp/gobuilder-mips64/tmp/TestGdbAutotmpTypes830246952/001/a.exe: unable to initialize decompress status for section .debug_abbrev
        "/tmp/gobuilder-mips64/tmp/TestGdbAutotmpTypes830246952/001/a.exe": not in executable format: File format not recognized
        No symbol table is loaded.  Use the "file" command.
        Make breakpoint pending on future shared library load? (y or [n]) [answered N; input not from terminal]
        No executable file specified.
        Use the "file" or "exec-file" command.
        The program is not being run.
        All types matching regular expression "astruct":
    runtime-gdb_test.go:527: could not find []main.astruct; in 'info typrs astruct' output
FAIL
FAIL	runtime	104.355s

greplogs --dashboard -md -l -e 'unable to initialize decompress status for section' --since=2022-03-01

2022-03-17T08:43:51-c379c3d/linux-mips64-rtrk
2022-03-17T08:43:15-599d539/linux-mips64-rtrk
2022-03-17T03:41:50-9956a54/linux-mips64-rtrk
2022-03-17T03:04:30-8427429/linux-mips64-rtrk
2022-03-17T02:43:05-f839aaa/linux-mips64-rtrk
2022-03-17T01:29:17-6686536/linux-mips64-rtrk
2022-03-17T00:12:40-1cfe100/linux-mips64-rtrk
2022-03-16T23:03:54-e5e638e/linux-mips64-rtrk
2022-03-16T20:39:14-ed4db86/linux-mips64-rtrk
2022-03-16T20:10:07-91631bc/linux-mips64-rtrk
2022-03-16T18:34:31-81d3c25/linux-mips64-rtrk
2022-03-16T07:03:20-5fd0ed7/linux-mips64-rtrk
2022-03-16T05:32:52-d34287a/linux-mips64-rtrk

[bcmills]

These failures started as of CL 380755 (attn @mengzhuo, @cherrymui, @thanm; CC @golang/runtime).

The tests are only failing on the one builder (attn @bogojevic, @milanknezevic), it is not a first-class port, and the failure may be due to a bug or deficiency in the installed gdb — so it seems to me that it would be fine to resolve this issue by skipping the affected tests on that builder. (As noted in #39204 (comment), we already skip those tests on a shockingly large fraction of builders.)

[mengzhuo]

I'll take a look.

[gopherbot]

Change https://go.dev/cl/393916 mentions this issue: cmd/link: Set alignment of compressed section based on arch alignment