Possible Compiler Bug #745
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I forgot to include this in the original report, but the output I get from the
segfaulting case is:
panic: runtime error: SIGSEGV: segmentation violation
panic PC=0x7ffc76cb3028
runtime.panic+0x7c /home/jgennis/go/src/pkg/runtime/proc.c:1012
runtime.panic(0x7ffc00000000, 0x406768)
panicstring+0x60 /home/jgennis/go/src/pkg/runtime/runtime.c:83
panicstring(0x469500, 0x7ffc76d181f0)
sigpanic+0x48 /home/jgennis/go/src/pkg/runtime/linux/thread.c:296
sigpanic()
go/printer.*printer·identList+0x94 /home/jgennis/go/src/pkg/go/printer/nodes.go:103
go/printer.*printer·identList(0x464be0, 0x452620, 0x0, 0x7ffc76cef930, 0x0, ...)
go/printer.*printer·parameters+0x29f /home/jgennis/go/src/pkg/go/printer/nodes.go:309
go/printer.*printer·parameters(0x7ffc76d12000, 0x7ffc76cf0420, 0x41f191, 0x0, 0x7ffc76ca32d8, ...)
go/printer.*printer·signature+0x155 /home/jgennis/go/src/pkg/go/printer/nodes.go:330
go/printer.*printer·signature(0x7ffc76d12000, 0x7ffc76d170f0, 0x7ffc76ca32d8, 0x7ffc00000020, 0x41f19176cef090, ...)
go/printer.*printer·funcDecl+0x2a0 /home/jgennis/go/src/pkg/go/printer/nodes.go:1380
go/printer.*printer·funcDecl(0x7ffc76d12000, 0x7ffc76d17000, 0x7ffc76d170f0, 0x7ffc76ca32d8, 0x7ffc76cef090, ...)
go/printer.*printer·decl+0xad /home/jgennis/go/src/pkg/go/printer/nodes.go:1393
go/printer.*printer·decl(0x7ffc76d12000, 0x7ffc76cf0510, 0x7ffc76ca32d8, 0x7ffc76cf0510, 0x1, ...)
go/printer._func_001+0x25f /home/jgennis/go/src/pkg/go/printer/printer.go:1017
go/printer._func_001(0x7ffc76d12000, 0x7ffc76cef810, 0x7ffc76cf0510, 0x7ffc00000000)
goexit /home/jgennis/go/src/pkg/runtime/proc.c:145
goexit()
goroutine 1 [4]:
gosched+0x4e /home/jgennis/go/src/pkg/runtime/proc.c:542
gosched()
chanrecv+0x3e6 /home/jgennis/go/src/pkg/runtime/chan.c:327
chanrecv(0x7ffc76ca9bf0, 0x7ffc76cef570, 0x0, 0x7ffc76caef60, 0x43fc4e, ...)
runtime.chanrecv1+0x41 /home/jgennis/go/src/pkg/runtime/chan.c:429
runtime.chanrecv1(0x7ffc76ca9ba0, 0x7ffc76caef80)
go/printer.*Config·Fprint+0x1e2 /home/jgennis/go/src/pkg/go/printer/printer.go:1032
go/printer.*Config·Fprint(0x7ffc76ca9ba0, 0x41f1ab, 0x7ffc76d18000, 0x7ffc76d12000, 0x7ffc76cab680, ...)
go/printer.Fprint+0x57 /home/jgennis/go/src/pkg/go/printer/printer.go:1047
go/printer.Fprint(0x7ffc76d053e0, 0x7ffc76cef4e0, 0x7ffc76d07000, 0x471cf8, 0x7ffc76cf0510, ...)
main.main+0x84 /home/jgennis/src/gobug/bug.go:95
main.main()
mainstart+0xf /home/jgennis/go/src/pkg/runtime/amd64/asm.s:60
mainstart()
goexit /home/jgennis/go/src/pkg/runtime/proc.c:145
goexit()
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Labels changed: added priority-high, compilerbug, removed priority-medium. Owner changed to r...@golang.org. Status changed to Accepted. |
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This issue was closed by revision 10eb76b. Status changed to Fixed. |
This issue was closed.
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What steps will reproduce the problem? 1. Compile the attached bug.go file into an executable 2. Run the compiled executable 3. Watch it segfault What is the expected output? What do you see instead? The attached program should print: func blah(x interface{}) (interface{}) { } What is your $GOOS? $GOARCH? $ echo $GOOS $GOARCH linux amd64 Which revision are you using? (hg identify) $ hg identify e7d0863b48db+ tip Please provide any additional information below. In the attached bug.go there are three pieces of code that are commented out. Uncommenting any one of them (and removing the code just below the comment) makes the code execute correctly. As far as I can see the commented code should do pretty much the same thing as the code causing the segfault.Attachments:
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