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runtime: linux/arm builders crash with runtime_pollWait: unblocked by ioready #6103

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dvyukov opened this issue Aug 11, 2013 · 4 comments
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runtime: linux/arm builders crash with runtime_pollWait: unblocked by ioready #6103

dvyukov opened this issue Aug 11, 2013 · 4 comments
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@dvyukov
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dvyukov commented Aug 11, 2013 

http://build.golang.org/log/131089a1af9f349727cec6ce76f236145744a49e
http://build.golang.org/log/2086f897676c67aa10d4683bef258f1cdf690fb4
http://build.golang.org/log/c88a005815efda13e9ca03b76f067a0d3e5c3e22
http://build.golang.org/log/46ebd8b48786519935e11b6e46bb1520e4997c14
and more

Happens only on linux/arm builders and always on reading from http persistent connection.

fatal error: runtime_pollWait: unblocked by ioready

goroutine 56 [running]:
runtime.throw(0x469567)
    /usr/local/go/src/pkg/runtime/panic.c:501 +0x5c fp=0xb4adde24
net.runtime_pollWait(0xb6dcf6c8, 0x72, 0x0)
    /usr/local/go/src/pkg/runtime/netpoll.goc:119 +0xac fp=0xb4adde30
net.(*pollDesc).Wait(0x107aa078, 0x72, 0x0, 0x0)
    /usr/local/go/src/pkg/net/fd_poll_runtime.go:81 +0x44 fp=0xb4adde40
net.(*pollDesc).WaitRead(0x107aa078, 0x0, 0x0)
    /usr/local/go/src/pkg/net/fd_poll_runtime.go:86 +0x40 fp=0xb4adde54
net.(*netFD).Read(0x107aa040, 0x107af000, 0x1000, 0x1000, 0x0, ...)
    /usr/local/go/src/pkg/net/fd_unix.go:210 +0x2cc fp=0xb4adde8c
net.(*conn).Read(0x107577f0, 0x107af000, 0x1000, 0x1000, 0x0, ...)
    /usr/local/go/src/pkg/net/net.go:123 +0xd4 fp=0xb4addeac
bufio.(*Reader).fill(0x1071cd50)
    /usr/local/go/src/pkg/bufio/bufio.go:91 +0x15c fp=0xb4addefc
bufio.(*Reader).Peek(0x1071cd50, 0x1, 0x0, 0x0, 0x0, ...)
    /usr/local/go/src/pkg/bufio/bufio.go:119 +0xdc fp=0xb4addf04
net/http.(*persistConn).readLoop(0x107205f0)
    /usr/local/go/src/pkg/net/http/transport.go:687 +0xdc fp=0xb4addfc4
runtime.goexit()
    /usr/local/go/src/pkg/runtime/proc.c:1364 fp=0xb4addfc4
created by net/http.(*Transport).dialConn
    /usr/local/go/src/pkg/net/http/transport.go:528 +0x5fc
@dvyukov
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dvyukov commented Aug 11, 2013

Comment 1:

Most likely started happening on:
net: add special netFD mutex
https://code.google.com/p/go/source/detail?r=7afd81b7fe122e743f0db88f538eb3b4004be650

@dvyukov
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dvyukov commented Aug 11, 2013

Comment 2:

Can there can be codegen issues? E.g. (void*)false != nil?
Issue with memory barriers? All state there is protected with locks, so unclear how it
can be...

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dvyukov commented Aug 11, 2013

Comment 3:

Status changed to Started.

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dvyukov commented Aug 13, 2013

Comment 4:

This issue was closed by revision 9707f26.

Status changed to Fixed.

@rsc rsc added this to the Go1.2 milestone Apr 14, 2015
@rsc rsc removed the go1.2 label Apr 14, 2015
@golang golang locked and limited conversation to collaborators Jun 24, 2016
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