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runtime/pprof: SIGPROF crashes process on netbsd/amd64 #10166

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bsiegert opened this issue Mar 14, 2015 · 2 comments
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runtime/pprof: SIGPROF crashes process on netbsd/amd64 #10166

bsiegert opened this issue Mar 14, 2015 · 2 comments
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FrozenDueToAge OS-NetBSD
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Unplanned

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@bsiegert
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This is on

$ uname -a
NetBSD edamame.mirbsd.org 7.0_BETA NetBSD 7.0_BETA (GENERIC.201501181820Z) amd64
$ go version
go version devel +3b1d692 Sat Mar 14 10:47:19 2015 +0000 netbsd/amd64

At tip, the runtime/pprof test fails, which also makes all.bash fail:

=== RUN TestMemoryProfiler
--- PASS: TestMemoryProfiler (0.02s)
=== RUN TestCPUProfile
exit status 255
FAIL    runtime/pprof   0.038s

Looking at ktrace output, it looks like the SIGPROF is what kills the process:

 16246      3 pprof.test RET   compat_60__lwp_park -1 errno 4
Interrupted system call
 16246      3 pprof.test PSIG  SIGPROF caught handler=0x456980
mask=(): code=SI_TIMER sent by pid=0, uid=0 with sigval 0x2)
 16246      3 pprof.test CALL  setcontext(0x40)
 16246      3 pprof.test RET   setcontext -1 errno 14 Bad address
 16246      3 pprof.test CALL  exit(0xffffffffffffffff)

According to Minux:

has NetBSD changed kernel signal handler ABI?
or there might some stack/register corruption in runtime.sigtramp. The implicit
setcontext(2) is picking up a wrong address for ucontext. Should we preserve
callee-saved registers in runtime.sigtramp? I'd start by setting a break on
runtime.sigtramp, and then disassemble the function it should return to and try
understand where does 0x40 come from.
@rsc rsc added this to the Unplanned milestone Apr 10, 2015
@gopherbot
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CL https://golang.org/cl/47036 mentions this issue.

gopherbot pushed a commit that referenced this issue Jun 28, 2017
@bradfitz
doc: document the state of NetBSD in the Go 1.9 release notes
3200207 
Updates #20836
Updates #19339
Updates #19652
Updates #20835
Updates #16511
Updates #10166
Updates #8574

Change-Id: If9a7f560489f1a8d628dafab227925bd8989326e
Reviewed-on: https://go-review.googlesource.com/47036
Reviewed-by: Ian Lance Taylor <iant@golang.org>
@bradfitz
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Fixed by requiring NetBSD 8+ for Go 1.10.

Documentation bug is #22911

@bradfitz bradfitz mentioned this issue Dec 2, 2017
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@golang golang locked and limited conversation to collaborators Nov 28, 2018
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@bradfitz @mikioh @rsc @bsiegert @gopherbot