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cmd/link: gdb frame unwinding fails on architectures with a link register #14628

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mundaym opened this issue Mar 3, 2016 · 1 comment
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cmd/link: gdb frame unwinding fails on architectures with a link register #14628

mundaym opened this issue Mar 3, 2016 · 1 comment
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@mundaym
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mundaym commented Mar 3, 2016

gdb is not given enough information about the stack frame layout to unwind frames on at least ppc64 and s390x, and I assume other link register architectures.

My colleague @bryanpkc has written a CL addressing this that I will be uploading shortly.

Current behavior:

(gdb) bt
#0  runtime.mallocgc (size=360, typ=0x5dbce0, flags=0, ~r3=0xffffffff1d8)
    at /sandbox/munday/go/go-linux-ppc64-bootstrap/src/runtime/malloc.go:500
#1  0x00000000000c5ff0 in runtime.malg (stacksize=0, ~r1=0x0)
    at /sandbox/munday/go/go-linux-ppc64-bootstrap/src/runtime/proc.go:2614
#2  0x0000000020000000 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Desired behavior:

(gdb) bt
#0  runtime.mallocgc (size=360, typ=0x5dbce0, flags=0, ~r3=0xffffffff1d8)
    at /sandbox/munday/go/go-linux-ppc64-bootstrap/src/runtime/malloc.go:500
#1  0x000000000009cf50 in runtime.newobject (typ=0x5dbce0, ~r1=0xc000000000)
    at /sandbox/munday/go/go-linux-ppc64-bootstrap/src/runtime/malloc.go:781
#2  0x00000000000c5ff0 in runtime.malg (stacksize=32768, ~r1=0x873ca0)
    at /sandbox/munday/go/go-linux-ppc64-bootstrap/src/runtime/proc.go:2614
#3  0x00000000000b9354 in runtime.mpreinit (mp=0x874460)
    at /sandbox/munday/go/go-linux-ppc64-bootstrap/src/runtime/os1_linux.go:205
#4  0x00000000000bf3a8 in runtime.mcommoninit (mp=0x874460)
    at /sandbox/munday/go/go-linux-ppc64-bootstrap/src/runtime/proc.go:494
#5  0x00000000000beef0 in runtime.schedinit ()
    at /sandbox/munday/go/go-linux-ppc64-bootstrap/src/runtime/proc.go:434
#6  0x00000000000ef824 in runtime.rt0_go ()
    at /sandbox/munday/go/go-linux-ppc64-bootstrap/src/runtime/asm_ppc64x.s:72
#7  0x0000000000000000 in ?? ()
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CL https://golang.org/cl/20193 mentions this issue.

@bradfitz bradfitz added this to the Unplanned milestone Apr 10, 2016
@golang golang locked and limited conversation to collaborators Apr 26, 2017
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