[swift-dev] ASan runtime does not come first

[Kate Stone]

Indeed the install location proves to be the root issue.  When LLDB is installed in /usr/bin/lldb we also wind up with content under /usr/lib/lldb that are presumed to be plugins – even though they aren't.  When an ASAN enabled library is loaded to initialize the plugin it notices LLDB isn't running with the ASAN runtime and immediately terminates it.

Workarounds: don't install Swift packages in the root directory, or install and then rename /usr/lib/lldb to /usr/lib/lldb-disabled.

A fix for this is being tracked as <rdar://problem/25921276>

Kate Stone k8stone at apple.com <mailto:k8stone at apple.com>
 Xcode Low Level Tools

> On Apr 25, 2016, at 11:43 AM, Joseph Bell via swift-dev <swift-dev at swift.org> wrote:
> 
> What I've found out so far is that the tree built in the 'install' directory (./install/usr) is not suitable to live side-by-side with /usr/ on the host machine.  My original approach (documented on http://dev.iachieved.it/iachievedit/ <http://dev.iachieved.it/iachievedit/>) was to ball everything up into a .deb package that installed as an overlay to /usr/, this was just to make it simple to get started.
> 
> Now with swift-2.2 and swift-3.0 and the possibility one might want to use both (python2.7, python3), I'm going to change over to placing in /opt/swift/VERSION and provide some alternatives mechanism, OR, use the approach that python2.7, 3, etc. use where there is a /usr/bin/python2.7/, /usr/lib/python2.7/, etc. and /usr/bin/python links back there.  
> 
> tl;dr:  I don't know what occurs exactly but the equivalent of rsync -a ./install/usr/ /usr/ (overlay) causes mayhem for starting the REPL.
> 
> On Mon, Apr 25, 2016 at 8:02 AM, Joseph Bell <joe at iachieved.it <mailto:joe at iachieved.it>> wrote:
> I've just noticed (thanks to you Ryan) that compiler-rt is indeed checked out and included in the 14.04 build but not the 15.10.  I'm going to rebuild from the ground up on 15.10 to see if it grabs compiler-rt and reproduces, as this is being checked out by the ci.swift.org <http://ci.swift.org/> CI server.
> 
> This error occurs before any downstream packaging (deb) and is failing the build itself (on the test REPL, it can't even load).  Will report back in a bit.
> 
> Joe
> 
> 
> On Mon, Apr 25, 2016 at 7:52 AM, Ryan Lovelett <swift-dev at ryan.lovelett.me <mailto:swift-dev at ryan.lovelett.me>> wrote:
> On Sun, Apr 24, 2016, at 05:44 PM, Joseph Bell via swift-dev wrote:
>> Well, I thought the REPL issues had all been put to rest, but now I am seeing this on Ubuntu 14.04 (15.10 I do not see it):
>>  
>> ➜  package-swift-3.0 git:(swift-3.0) ✗ ./install/usr/bin/swift
>> ==18928==ASan runtime does not come first in initial library list; you should either link runtime to your application or manually preload it with LD_PRELOAD.
>>  
>> This is with the "master" branches that build Swift 3.0, hashes:
>>  
>> $ swift swiftrevs.swift
>> swift:95e3be665d
>> llvm:752e1430fc
>> clang:1e6cba3ce3
>> lldb:a38bed5855
>> compiler-rt:a897309947
>> cmark:5af77f3c1d
>> llbuild:ea9fd78a4a
>> swiftpm:22954afe9f
>> swift-corelibs-xctest:efdde9849c
>> swift-corelibs-foundation:d2dc9f3cf9
>> swift-integration-tests:98f6c6d992
>> swift-corelibs-libdispatch:65330e06d9
>>  
>> Is anyone else building the world on Ubuntu 14.04 that can verify this?
>  
> I have seen this behavior many times in many scenarios. Almost always it has to do with a build parameter.
>  
> Recently I have noticed that compiling with the "compiler-rt" project seems to cause this issue frequently. I do not understand what "compiler-rt" is, or what its value to Swift is, so I just omit it from my builds. It maybe worth while to do the same and rebuild and see if it goes away.
>  
> I would think that if "compiler-rt" is the source of the issues then something likely needs to be submitted to bugs.swift.org <http://bugs.swift.org/>.
>  
> Another thing to check is if your packaging Swift (dep, rpm, pacman, etc...) that you are do not strip symbols from binaries and libraries as part of packaging.
>  
>> Regards,
>> Joe
>>  
>> -- 
>> Joseph Bell
>> http://dev.iachieved.it/iachievedit/ <http://dev.iachieved.it/iachievedit/>
>> @iachievedit
>> _______________________________________________
>> swift-dev mailing list
>> swift-dev at swift.org <mailto:swift-dev at swift.org>
>> https://lists.swift.org/mailman/listinfo/swift-dev <https://lists.swift.org/mailman/listinfo/swift-dev>
>  
> 
> 
> 
> -- 
> Joseph Bell
> http://dev.iachieved.it/iachievedit/ <http://dev.iachieved.it/iachievedit/>
> @iachievedit
> 
> 
> 
> -- 
> Joseph Bell
> http://dev.iachieved.it/iachievedit/ <http://dev.iachieved.it/iachievedit/>
> @iachievedit
> _______________________________________________
> swift-dev mailing list
> swift-dev at swift.org
> https://lists.swift.org/mailman/listinfo/swift-dev

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-dev/attachments/20160425/55b34091/attachment.html>