• Keith Randall's avatar
    runtime: be very careful with bad pointer tests · 3b2577ce
    Keith Randall authored
    Saw this on a test:
    
    runtime: bad pointer in frame runtime_test.testSetPanicOnFault at 0xc20801c6b0: 0xfff
    fatal error: bad pointer!
    
    runtime stack:
    ...
    copystack(0xc2081bf7a0, 0x1000)
            /root/work/solaris-amd64-smartos-2dde8b453d26/go/src/runtime/stack.c:621 +0x173 fp=0xfffffd7ffd5ffee0 sp=0xfffffd7ffd5ffe20
    runtime.newstack()
            /root/work/solaris-amd64-smartos-2dde8b453d26/go/src/runtime/stack.c:774 +0x552 fp=0xfffffd7ffd5fff90 sp=0xfffffd7ffd5ffee0
    runtime.morestack()
            /root/work/solaris-amd64-smartos-2dde8b453d26/go/src/runtime/asm_amd64.s:324 +0x90 fp=0xfffffd7ffd5fff98 sp=0xfffffd7ffd5fff90
    
    goroutine 163354 [stack growth]:
    ...
    runtime.convT2E(0x587000, 0xc20807bea8, 0x0, 0x0)
            /root/work/solaris-amd64-smartos-2dde8b453d26/go/src/runtime/iface.go:141 +0xd2 fp=0xc20801c678 sp=0xc20801c640
    runtime_test.testSetPanicOnFault(0xc20822c510, 0xfff, 0xc20801c748)
            /root/work/solaris-amd64-smartos-2dde8b453d26/go/src/runtime/runtime_test.go:211 +0xc6 fp=0xc20801c718 sp=0xc20801c678
    ...
    
    This test is testing bad pointers.  It loads the bad pointer into a pointer variable,
    but before it gets a chance to dereference it, calls convT2E.  That call causes a stack copy,
    which exposes that live but bad pointer variable.
    
    LGTM=dvyukov
    R=golang-codereviews, dvyukov
    CC=golang-codereviews
    https://golang.org/cl/146880043
    3b2577ce
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