runtime: segfault in tests #5422
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Some notes.
When I look at the type _select in zruntime_defs_$(GOOS)_$(GOARCH).go, I'm slightly
troubled by this:
type _select struct {
tcase uint16
ncase uint16
pollorder *uint16
lockorder **hchan
scase [1]scase
}
The C code will allocate more than one entry for scase (see newselect in chan.c). Will
the precise GC handle this unwarranted chumminess correctly? It should be fine as long
as all the pointers to this memory are (from the point of view of the GC) untyped. And
that may well be the case.
The crash is happening on a parked call to selunlock, which must have come from
chan.c:989. When I look at the goroutine backtraces, I'm puzzled that I don't see any
goroutine sitting at that line number. Somebody must have called runtime·ready on the
goroutine to cause it to start going again, but where is it? This may be expected, I'm
not sure.
At the point of failure the program is running TestMultiConsumer from
runtime/chan_test.go. It's interesting to note that that test does not use select at
all, so it would seem that whatever goroutine is executing a select is left over from
some earlier test. Although I can't make out which test that would be.
|
I've found a way to reproduce this more reliably:
GOGC=0 GOGCTRACE=1 GOMAXPROCS=2 ./runtime.test -test.short
-test.cpu=1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4
-test.v
It failed within 3 or 4 runs.
Here's another trace:
=== RUN TestPseudoRandomSend-2
gc313476(2): 0+0+0 ms, 10 -> 10 MB 3021 -> 3021 (1262540-1259519) objects, 2(30)
handoff, 6(385) steal, 31/4/0 yields
gc313477(2): 0+0+0 ms, 10 -> 10 MB 3022 -> 3022 (1262542-1259520) objects, 2(23)
handoff, 4(413) steal, 40/6/1 yields
gc313478(2): 0+0+0 ms, 10 -> 10 MB 3023 -> 3023 (1262544-1259521) objects, 2(19)
handoff, 6(421) steal, 37/3/0 yields
gc313479(2): 0+0+0 ms, 10 -> 10 MB 3024 -> 3024 (1262546-1259522) objects, 2(12)
handoff, 10(1357) steal, 36/15/2 yields
gc313480(2): 0+0+0 ms, 10 -> 10 MB 3025 -> 3025 (1262548-1259523) objects, 1(15)
handoff, 5(170) steal, 31/4/0 yields
gc313481(2): 0+0+0 ms, 10 -> 10 MB 3026 -> 3026 (1262550-1259524) objects, 2(10)
handoff, 10(1357) steal, 26/15/2 yields
gc313482(2): 0+0+0 ms, 10 -> 10 MB 3027 -> 3027 (1262552-1259525) objects, 2(43)
handoff, 6(421) steal, 36/7/0 yields
gc313483(2): 0+0+0 ms, 10 -> 10 MB 3028 -> 3023 (1262554-1259531) objects, 0(0) handoff,
5(408) steal, 22/11/0 yields
gc313484(2): 0+0+0 ms, 10 -> 10 MB 3023 -> 3023 (1262556-1259533) objects, 1(9) handoff,
4(418) steal, 24/3/0 yields
gc313485(2): 0+0+0 ms, 10 -> 10 MB 3023 -> 3023 (1262558-1259535) objects, 3(56)
handoff, 5(1124) steal, 22/14/1 yields
gc313486(2): 0+0+0 ms, 10 -> 10 MB 3023 -> 3023 (1262560-1259537) objects, 3(61)
handoff, 4(1123) steal, 22/15/1 yields
gc313487(2): 0+0+0 ms, 10 -> 10 MB 3023 -> 3023 (1262562-1259539) objects, 4(115)
handoff, 4(834) steal, 22/15/1 yields
gc313488(2): 0+0+0 ms, 10 -> 10 MB 3023 -> 3023 (1262564-1259541) objects, 1(5) handoff,
5(419) steal, 22/2/0 yields
SIGSEGV: segmentation violation
PC=0x4065cf
selunlock(0xc2008cab40)
/home/alberts/go/src/pkg/runtime/chan.c:817 +0x3f
park0(0xc200817200)
/home/alberts/go/src/pkg/runtime/proc.c:1186 +0x7a
runtime.mcall()
/home/alberts/go/src/pkg/runtime/asm_amd64.s:195 +0x49
goroutine 1 [chan receive]:
runtime.park(0x40d1b0, 0xc2003103b0, 0x75f90a)
/home/alberts/go/src/pkg/runtime/proc.c:1175 +0x64
runtime.chanrecv(0x573a00, 0xc200310360, 0x7f4c9831cce0, 0x0, 0x0, ...)
/home/alberts/go/src/pkg/runtime/chan.c:366 +0x566
runtime.chanrecv1()
/home/alberts/go/src/pkg/runtime/chan.c:458 +0x38
testing.RunTests(0x650528, 0x760260, 0x31, 0x31, 0x1, ...)
/build/go/go/src/pkg/testing/testing.go:434 +0x88e
testing.Main(0x650528, 0x760260, 0x31, 0x31, 0x762040, ...)
/build/go/go/src/pkg/testing/testing.go:365 +0x8a
main.main()
runtime/_test/_testmain.go:319 +0x9a
runtime.main()
/home/alberts/go/src/pkg/runtime/proc.c:182 +0x92
runtime.goexit()
/home/alberts/go/src/pkg/runtime/proc.c:1223
goroutine 2 [syscall]:
runtime.entersyscallblock()
/home/alberts/go/src/pkg/runtime/proc.c:1333 +0x16e
runtime.MHeap_Scavenger()
/home/alberts/go/src/pkg/runtime/mheap.c:454 +0xee
runtime.goexit()
/home/alberts/go/src/pkg/runtime/proc.c:1223
created by runtime.main
/home/alberts/go/src/pkg/runtime/proc.c:165
goroutine 68 [timer goroutine (idle)]:
runtime.park(0x40d1b0, 0x763420, 0x75a686)
/home/alberts/go/src/pkg/runtime/proc.c:1175 +0x64
timerproc()
/home/alberts/go/src/pkg/runtime/ztime_linux_amd64.c:187 +0x79
runtime.goexit()
/home/alberts/go/src/pkg/runtime/proc.c:1223
created by addtimer
/home/alberts/go/src/pkg/runtime/ztime_linux_amd64.c:82
goroutine 36 [finalizer wait]:
runtime.park(0x0, 0x0, 0x760ad1)
/home/alberts/go/src/pkg/runtime/proc.c:1175 +0x64
runfinq()
/home/alberts/go/src/pkg/runtime/mgc0.c:2182 +0x6d
runtime.goexit()
/home/alberts/go/src/pkg/runtime/proc.c:1223
created by runtime.gc
/home/alberts/go/src/pkg/runtime/mgc0.c:1886
goroutine 560834 [runnable]:
runtime.gosched()
/home/alberts/go/src/pkg/runtime/proc.c:1201 +0x25
runtime.Gosched()
/home/alberts/go/src/pkg/runtime/proc.c:1621 +0x18
runtime_test.func·001()
/home/alberts/go/src/pkg/runtime/chan_test.go:38 +0x55
runtime.goexit()
/home/alberts/go/src/pkg/runtime/proc.c:1223
created by runtime_test.TestPseudoRandomSend
/home/alberts/go/src/pkg/runtime/chan_test.go:42 +0x12d
goroutine 560833 [running]:
runtime.park(0xc2008cab40, 0x7f4c9835c7e8, 0x75fa36)
/home/alberts/go/src/pkg/runtime/proc.c:1175 +0x64
selectgo(0x7f4c97e14ec8)
/home/alberts/go/src/pkg/runtime/chan.c:1119 +0x28d
created by testing.RunTests
/build/go/go/src/pkg/testing/testing.go:433 +0x86b
rax 0x0
rbx 0x0
rcx 0x0
rdx 0xc200310ee0
rdi 0x419320
rsi 0xc200791a00
rbp 0xc200310ea0
rsp 0xc200797f58
r8 0xffffffff
r9 0xc200310ea0
r10 0x0
r11 0x202
r12 0x0
r13 0x4f
r14 0x3f59824c084218
r15 0x6261d0
rip 0x4065cf
rflags 0x10202
cs 0x33
fs 0x0
gs 0x0
|
The good news is that running TestPseudoRandomSend on its own crashes it in a few seconds. GOGC=0 GOGCTRACE=1 GOMAXPROCS=2 ./runtime.test -test.short -test.cpu=1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4,1,2,4 -test.v -test.run=TestPseudoRandomSend |
Thanks. I was able to replicate the crash on my Ubuntu system.
SIGSEGV: segmentation violation
PC=0x4065cf
goroutine 1 [chan receive]:
testing.RunTests(0x650528, 0x760260, 0x31, 0x31, 0x1, ...)
/home/iant/go2/src/pkg/testing/testing.go:434 +0x88e
testing.Main(0x650528, 0x760260, 0x31, 0x31, 0x762040, ...)
/home/iant/go2/src/pkg/testing/testing.go:365 +0x8a
main.main()
runtime/_test/_testmain.go:319 +0x9a
goroutine 62 [chan receive]:
runtime_test.func·001()
/home/iant/go2/src/pkg/runtime/chan_test.go:39 +0x6f
created by runtime_test.TestPseudoRandomSend
/home/iant/go2/src/pkg/runtime/chan_test.go:42 +0x12d
goroutine 61 [running]:
created by testing.RunTests
/home/iant/go2/src/pkg/testing/testing.go:433 +0x86b
rax 0x0
rbx 0x0
rcx 0x0
rdx 0xc2000d5580
rdi 0x419320
rsi 0xc200079b00
rbp 0xc2000d5540
rsp 0xc2000e7f58
r8 0xffffffff
r9 0xc2000d5540
r10 0x0
r11 0x202
r12 0x0
r13 0x62
r14 0x10
r15 0x6261d0
rip 0x4065cf
rflags 0x10202
cs 0x33
fs 0x0
gs 0x0
Labels changed: added priority-asap, go1.1, removed priority-triage. |
With GOTRACEBACK=2:
SIGSEGV: segmentation violation
PC=0x4065cf
selunlock(0xc2001130c0)
/home/iant/go2/src/pkg/runtime/chan.c:817 +0x3f
park0(0xc200079800)
/home/iant/go2/src/pkg/runtime/proc.c:1186 +0x7a
runtime.mcall()
/home/iant/go2/src/pkg/runtime/asm_amd64.s:195 +0x49
goroutine 1 [running]:
syscall.Syscall()
/home/iant/go2/src/pkg/syscall/asm_linux_amd64.s:16 +0x5
syscall.write(0x1, 0xc2000b8800, 0x30, 0x4a70fd, 0xc2000b7120, ...)
/home/iant/go2/src/pkg/syscall/zerrors_linux_amd64.go:2717 +0x70
syscall.Write(0x1, 0xb8800, 0x4b1b8a, 0xc2000b7120, 0x4c4498, ...)
/home/iant/go2/src/pkg/syscall/syscall_unix.go:143 +0x5a
goroutine 2 [syscall]:
runtime.entersyscallblock()
/home/iant/go2/src/pkg/runtime/proc.c:1333 +0x16e
runtime.MHeap_Scavenger()
/home/iant/go2/src/pkg/runtime/mheap.c:454 +0xee
runtime.goexit()
/home/iant/go2/src/pkg/runtime/proc.c:1223
created by runtime.main
/home/iant/go2/src/pkg/runtime/proc.c:165
rax 0x0
rbx 0x0
rcx 0x0
rdx 0xc200112be0
rdi 0x419320
rsi 0xc200079b00
rbp 0xc200112ba0
rsp 0xc2000e4f58
r8 0xffffffff
r9 0xc200112ba0
r10 0x0
r11 0x202
r12 0x80
r13 0x4b
r14 0x10
r15 0x6261d0
rip 0x4065cf
rflags 0x10202
cs 0x33
fs 0x0
gs 0x0
|
I see the problem. Will send a fix shortly. Owner changed to @dvyukov. Status changed to Started. |
|
This issue was closed by revision 26d95d8. Status changed to Fixed. |
adg
added a commit
that referenced
this issue
May 11, 2015
««« CL 9311043 / 53bc96b4c0c7 runtime: fix crash in select runtime.park() can access freed select descriptor due to a racing free in another thread. See the comment for details. Slightly modified version of dvyukov's CL 9259045. No test yet. Before this CL, the test described in issue 5422 would fail about every 40 times for me. With this CL, I ran the test 5900 times with no failures. Fixes #5422. R=golang-dev, r CC=golang-dev https://golang.org/cl/9311043 »»» R=golang-dev, r CC=golang-dev https://golang.org/cl/9304044
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What steps will reproduce the problem? ./run.bash --no-rebuild What do you see instead? # GOMAXPROCS=2 runtime -cpu=1,2,4 SIGSEGV: segmentation violation PC=0x4065cf selunlock(0xc2009a4cc0) /build/go.tip/go/src/pkg/runtime/chan.c:817 +0x3f park0(0xc20099bd00) /build/go.tip/go/src/pkg/runtime/proc.c:1186 +0x7a runtime.mcall() /build/go.tip/go/src/pkg/runtime/asm_amd64.s:195 +0x49 goroutine 1 [runnable]: runtime.park(0x40d1b0, 0xc2007e84d0, 0x75f92a) /build/go.tip/go/src/pkg/runtime/proc.c:1175 +0x64 runtime.chanrecv(0x573a20, 0xc2007e8480, 0x7f3f426f4ce0, 0x0, 0x0, ...) /build/go.tip/go/src/pkg/runtime/chan.c:366 +0x566 runtime.chanrecv1() /build/go.tip/go/src/pkg/runtime/chan.c:458 +0x38 testing.RunTests(0x650568, 0x760280, 0x31, 0x31, 0x1, ...) /build/go.tip/go/src/pkg/testing/testing.go:434 +0x88e testing.Main(0x650568, 0x760280, 0x31, 0x31, 0x762060, ...) /build/go.tip/go/src/pkg/testing/testing.go:365 +0x8a main.main() runtime/_test/_testmain.go:319 +0x9a runtime.main() /build/go.tip/go/src/pkg/runtime/proc.c:182 +0x92 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 goroutine 2 [syscall]: runtime.entersyscallblock() /build/go.tip/go/src/pkg/runtime/proc.c:1333 +0x16e runtime.MHeap_Scavenger() /build/go.tip/go/src/pkg/runtime/mheap.c:454 +0xee runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime.main /build/go.tip/go/src/pkg/runtime/proc.c:165 goroutine 3 [syscall]: runtime.entersyscallblock() /build/go.tip/go/src/pkg/runtime/proc.c:1333 +0x16e timerproc() /build/go.tip/go/src/pkg/runtime/ztime_linux_amd64.c:195 +0xbc runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by addtimer /build/go.tip/go/src/pkg/runtime/ztime_linux_amd64.c:82 goroutine 80122 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x0) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 73 [finalizer wait]: runtime.park(0x0, 0x0, 0x760af1) /build/go.tip/go/src/pkg/runtime/proc.c:1175 +0x64 runfinq() /build/go.tip/go/src/pkg/runtime/mgc0.c:2182 +0x6d runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime.gc /build/go.tip/go/src/pkg/runtime/mgc0.c:1886 goroutine 80139 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x11) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80135 [running]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0xd) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80131 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x9) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80140 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x12) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80123 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x1) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80125 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x3) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80142 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x14) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80144 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x16) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80136 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0xe) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80137 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0xf) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80126 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x4) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80127 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x5) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80145 [runnable]: runtime.park(0x40d1b0, 0xc2007bc350, 0x7f3f4227df78) /build/go.tip/go/src/pkg/runtime/proc.c:1175 +0x64 runtime.chansend(0x5739c0, 0xc2007bc280, 0x7f3f4227df78, 0x0, 0x47d279, ...) /build/go.tip/go/src/pkg/runtime/chan.c:261 +0x1d7 runtime.chansend1() /build/go.tip/go/src/pkg/runtime/chan.c:450 +0x4c runtime_test.func·003() /build/go.tip/go/src/pkg/runtime/chan_test.go:93 +0xb9 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:98 +0x23d goroutine 80129 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x7) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80138 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x10) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80143 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x15) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80130 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x8) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80121 [runnable]: runtime.park(0x40d1b0, 0xc2007bc550, 0x0) /build/go.tip/go/src/pkg/runtime/proc.c:1175 +0x64 runtime.chanrecv(0x5739c0, 0xc2007bc500, 0x7f3f4228be88, 0x0, 0x7f3f4228be90, ...) /build/go.tip/go/src/pkg/runtime/chan.c:397 +0x234 runtime.chanrecv2() /build/go.tip/go/src/pkg/runtime/chan.c:470 +0x45 runtime_test.TestMultiConsumer(0xc200781510) /build/go.tip/go/src/pkg/runtime/chan_test.go:103 +0x27e testing.tRunner(0xc200781510, 0x7602e0) /build/go.tip/go/src/pkg/testing/testing.go:353 +0x8a runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by testing.RunTests /build/go.tip/go/src/pkg/testing/testing.go:433 +0x86b goroutine 80124 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x2) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80128 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x6) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80133 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0xb) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80132 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0xa) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80141 [running]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0x13) /build/go.tip/go/src/pkg/runtime/chan_test.go:76 +0x55 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab goroutine 80134 [runnable]: runtime.gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1201 +0x25 runtime.Gosched() /build/go.tip/go/src/pkg/runtime/proc.c:1621 +0x18 runtime_test.func·002(0xc) /build/go.tip/go/src/pkg/runtime/chan_test.go:79 +0xb0 runtime.goexit() /build/go.tip/go/src/pkg/runtime/proc.c:1223 created by runtime_test.TestMultiConsumer /build/go.tip/go/src/pkg/runtime/chan_test.go:84 +0x1ab rax 0x0 rbx 0x0 rcx 0x0 rdx 0xc2007e8dc0 rdi 0x419340 rsi 0xc2003bd600 rbp 0xc2007e8d80 rsp 0xc20094cf58 r8 0xffffffff r9 0xc2007e8d80 r10 0x0 r11 0x202 r12 0x80 r13 0x4f r14 0x2aa89543b5100c r15 0x626210 rip 0x4065cf rflags 0x10202 cs 0x33 fs 0x0 gs 0x0 FAIL runtime 8.486s Which compiler are you using (5g, 6g, 8g, gccgo)? 6g Which operating system are you using? linux Which version are you using? (run 'go version') go version devel +17c26220ac96 Mon May 06 10:15:16 2013 -0700 linux/amd64 Please provide any additional information below. first time I've seen this one...The text was updated successfully, but these errors were encountered: