llvm dev - Apr 2014 - [LLVMdev] Need help reproducing a sanitizer buildbot failure

On Thu, Apr 10, 2014 at 4:43 PM, Reid Kleckner <rnk at google.com> wrote:
> msan isn't usable without an instrumented C++ standard library.
>
> The script in question is here:
>
>
https://code.google.com/p/address-sanitizer/source/browse/trunk/build/scripts/slave/buildbot_bootstrap.sh
>
Thanks, Reid. I've gotten the script and I'm now running it locally.
It's
running into trouble in llvm_build2_asan, so I'll have to kick it a bit
first.


I think the bot usually gives a readable error report, but it doesn't
work
> for this test because the test is passing stderr to FileCheck.  Lots of
> tests do that, and we should find a way to make that work.  We might want
> to pass MSAN_OPTIONS=log_path=/tmp/something.log and then cat that file
> from lit if it's non-empty.
>
Yeah. From the output, I can see part of the msan failure, but I can't see
the whole thing. Worse, I can't even replicate it.


Diego.
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OK, so now I've gotten a build but the output from asan is less than
helpful:

$ llvm/x/llvm_build_asan/./bin/opt
llvm/x/llvm/test/Other/optimization-remarks-inline.ll
-inline -pass-remarks=inline -S
==================================================================6791==ERROR:
AddressSanitizer: heap-use-after-free on address
0x6040000016a8 at pc 0x1e70553 bp 0x7fff29de4fb0 sp 0x7fff29de4fa8
READ of size 13 at 0x6040000016a8 thread T0
    #0 0x1e70552 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x1e70552)
    #1 0x1e6f3d3 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x1e6f3d3)
    #2 0x7ab722 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x7ab722)
    #3 0x19eacc5 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x19eacc5)
    #4 0x1892f92 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x1892f92)
[ ... ]

Is there an option for asan to show me source file locations?  Or at least
function names.  I'm not sure what to do with this.


Thanks.  Diego.
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On Fri, Apr 11, 2014 at 3:12 AM, Diego Novillo <dnovillo at google.com>
wrote:
> OK, so now I've gotten a build but the output from asan is less than
> helpful:
>
> $ llvm/x/llvm_build_asan/./bin/opt
llvm/x/llvm/test/Other/optimization-remarks-inline.ll
> -inline -pass-remarks=inline -S
> ================================================================>
==6791==ERROR: AddressSanitizer: heap-use-after-free on address
> 0x6040000016a8 at pc 0x1e70553 bp 0x7fff29de4fb0 sp 0x7fff29de4fa8
> READ of size 13 at 0x6040000016a8 thread T0
>     #0 0x1e70552 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x1e70552)
>     #1 0x1e6f3d3 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x1e6f3d3)
>     #2 0x7ab722 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x7ab722)
>     #3 0x19eacc5 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x19eacc5)
>     #4 0x1892f92 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x1892f92)
> [ ... ]
>
> Is there an option for asan to show me source file locations?  Or at least
> function names.  I'm not sure what to do with this.
>
You need one of these:
https://code.google.com/p/address-sanitizer/wiki/CallStack

(Hmm. I thought that on our bot the reports are symbolized... No?)

>
>
> Thanks.  Diego.
>
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You need llvm-symbolizer in PATH.
On Apr 11, 2014 3:16 AM, "Diego Novillo" <dnovillo at
google.com> wrote:
> OK, so now I've gotten a build but the output from asan is less than
> helpful:
>
> $ llvm/x/llvm_build_asan/./bin/opt
llvm/x/llvm/test/Other/optimization-remarks-inline.ll
> -inline -pass-remarks=inline -S
> ================================================================>
==6791==ERROR: AddressSanitizer: heap-use-after-free on address
> 0x6040000016a8 at pc 0x1e70553 bp 0x7fff29de4fb0 sp 0x7fff29de4fa8
> READ of size 13 at 0x6040000016a8 thread T0
>     #0 0x1e70552 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x1e70552)
>     #1 0x1e6f3d3 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x1e6f3d3)
>     #2 0x7ab722 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x7ab722)
>     #3 0x19eacc5 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x19eacc5)
>     #4 0x1892f92 (/ssd/dnovillo/llvm/x/llvm_build_asan/bin/opt+0x1892f92)
> [ ... ]
>
> Is there an option for asan to show me source file locations?  Or at least
> function names.  I'm not sure what to do with this.
>
>
> Thanks.  Diego.
>
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