runtime: SIGSEGV when building on freebsd ARM #25770
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compiler/runtime
Issues related to the Go compiler and/or runtime.
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Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
OS-FreeBSD
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^ something passed a nil pollDesc to netpollunblock, this came from runtime.netpoll So ev.udata was nil. It's possible that the definition of the kqueue event type is not correct on freebsd/arm |
ianlancetaylor
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OS-FreeBSD
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You say "I was able to bootstrap with go14 just fine". Does that mean that you were able to build 1.4, or that you were able to use 1.4 to build 1.10.2? Does the problem only occur in a jail, or does it always happen? We do have a freebsd-arm builder, and it seems to be mostly working. |
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Also, you do not need to use go1.4 to bootstrap, in fact, its getting
harder to do that every release. You can, and probably should, use
something newer.
…On 7 June 2018 at 14:33, Ian Lance Taylor ***@***.***> wrote:
You say "I was able to bootstrap with go14 just fine". Does that mean that
you were able to build 1.4, or that you were able to use 1.4 to build
1.10.2? Does the problem only occur in a jail, or does it always happen?
We do have a freebsd-arm builder, and it seems to be mostly working.
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@ianlancetaylor I meant I was able to build 1.4. @davecheney according to https://golang.org/doc/install/source it says to bootstrap using go1.4. Maybe I'm not understanding the terms, essentially I am looking at the Makefile from here https://svnweb.freebsd.org/ports/head/lang/go/Makefile?view=markup which depends on go14 in order to build go 1.10.2. I'll try building as ARM outside of the poudriere jail to see if that makes a difference and report back. |
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So building outside of poudriere works fine. Of note poudriere runs the arm jail in a qemu-arm-static emulator. Perhaps it's related to that. |
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I am wondering if this issue is related to issue #24656 and perhaps that fix just needs to be ported to the freebsd side. |
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After copying the change from https://go-review.googlesource.com/c/go/+/111176/7/src/runtime/os_linux.go#416 to os_freebsd.go I end up with the following. |
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CC @aclements |
ianlancetaylor
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I have the same issue with FreeBSD 11.1-RELEASE-p10, amd64 architecture. The problem is visible only inside KVM guest - everything works fine on actual hardware. Some examples of my crashes (unmodified sources): or: or or |
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After installing UPDATE: it works sometimes, but sometimes I still see the crash. |
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That package isn't even available on ARM, I think your issue is unrelated to this issue which is specific to compiling the Go tools in ARM under poudriere/qemu. |
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Just encountered #26141, which might be related. I conservatively created a new issue, since they don't look to be the exact same issue to me. |
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@artooro Since it works on normal FreeBSD/ARM but fails on QEMU, I would look closely at the definition of |
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FYI as of a couple of months ago the FreeBSD/ARM builder is running under QEMU with KVM acceleration (using the ARMv7 virtualization extensions - details here). This is different from qemu-arm-static which is "QEMU User Mode". As Ian notes there might be bugs in the user qemu code translating the system calls, especially with the host being 64-bit while the ARM ABI it's emulating is 32-bit. |
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@artooro, sorry if I missed this somewhere, but what is the host architecture you're running on (outside of the qemu emulation)? Is it also ARM or something else? In particular, QEMU doesn't have any special handling for |
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@aclements I've tested on multiple host machines, all were 64-bit Intel. I don't have an ARM host machine to test with. It sounds like if I used a 32-bit host, it might work from what you're saying. Perhaps I'll install 32-bit freebsd in a VM to test. |
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That would be an interesting test. |
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Trying to build go on freebsd-arm. I've tried both 1.10.2 and master branch from git. Both have the same issue.
I was able to bootstrap with go14 just fine, and the output of go env is
What did you do?
I built a new jail on my freebsd 11.1 machine as follows
poudriere jail -c -j 111armv6 -a arm.armv6 -x -m git -U https://github.com/freebsd/freebsd.git -v releng/11.1To build go I ran:
poudriere bulk -j 111armv6 -i -v lang/goTo further troubleshoot from inside the jail I ran make.bash directly via:
GOROOT_BOOTSTRAP=/usr/local/go14 ./make.bashWhat did you expect to see?
I expected it to build. And it does build if everything else is equal and all I do is make the jail amd64 instead of arm, everything is fine.
What did you see instead?
Build output below. I've been able to reproduce this on both a physical server running freebsd 11.1 bare metal and also on a virtual machine.
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