[lldb-dev] incorrect shared library addresses

Wed Oct 14 13:49:58 PDT 2015

Yep, it looks like LC_VERSION_MIN_MACOSX is missing.
target list shows:
  target #0: /private/tmp/gopath/bin/wikilinktester ( arch=x86_64-apple-,
platform=host )
specifying --arch doesn't seem to work. It still has the modules loaded
starting at 0, and target list says:
* target #1: /tmp/gopath/bin/wikilinktester ( arch=x86_64h-apple-macosx,
platform=host, pid=48597, state=stopped )

If you link a go program with c code it uses the system linker, which does
add LC_VERSION_MIN_MACOSX. That explains why I've never seen this before.
Here's what that sort of binary looks like:
(lldb) target list
Current targets:
* target #0: /private/tmp/gopath/bin/wikilinktester (
arch=x86_64-apple-macosx, platform=host, pid=49564, state=stopped )
(lldb) image list
[  0] DC92B610-E1DD-3CB2-AD7E-4EEF21E19D20 0x0000000004000000
/private/tmp/gopath/bin/wikilinktester
[  1] B1B370A5-479F-3533-8AD7-97B687D4F989 0x00007fff5fc00000 /usr/lib/dyld
[  2] 1866C519-C5F3-3D09-8C17-A8F703664521 0x00007fff86ce6000
/usr/lib/libSystem.B.dylib
[  3] 5C0892B8-9691-341F-9279-CA3A74D59AA0 0x00007fff8631a000
/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
...

On Wed, Oct 14, 2015 at 11:49 AM Greg Clayton <gclayton at apple.com> wrote:

> I am guessing that your binary is missing a LC_VERSION_MIN_XXX load
> command and so it is being loaded with "<arch>-unknown-unknown" as the
> architecture. This is probably causing LLDB to load the DynamicLoaderStatic
> as the dynamic loader which just loads all shared libraries as the address
> that is contained within the file itself, which is zero for most shared
> libraries.
>
> If you have a linker that is generating mach-o files, you will need to add
> a LC_VERSION_MIN_MACOSX load command to your executable so we know it is
> MacOSX.
>
> What does the output of "target list" show as the triple? It is probably
> "x86_64-unknown-unknown". We are often able to extract the correct triple
> for an executable from the executable itself. When no architecture if
> specified, it will default to the architecture that we detect in the main
> executable and this architecture will be used when a process asks for
> plug-ins to be created, line a DynamicLoader plug-in. If the triple is
> wrong, then we might select the wrong plug-ins for what you are trying to
> debug.
>
> You might be able to get around this for now by specifying this when you
> create your target:
>
> (lldb) target create --arch=x86_64-apple-macosx
> /tmp/gopath/bin/wikilinktester
>
> > On Oct 13, 2015, at 4:25 PM, Ryan Brown via lldb-dev <
> lldb-dev at lists.llvm.org> wrote:
> >
> > I'm having a strange issue debugging a go program.
> >
> > I set a breakpoint, and lldb stops at it. However, lldb thinks it's in a
> different function:
> > (lldb) b wikilinktester.go:35
> > Breakpoint 1: where = wikilinktester`main.main + 805 at
> wikilinktester.go:35, address = 0x0000000000002365
> > (lldb) r
> > Process 43141 launched: '/tmp/gopath/bin/wikilinktester' (x86_64)
> > Process 43141 stopped
> > * thread #5: tid = 0x0001, 0x0000000000002365
> libOpenScriptingUtil.dylib, stop reason = breakpoint 1.1
> >     frame #0: 0x0000000000002365 libOpenScriptingUtil.dylib
> > ->  0x2365: movq   %rax, 0x48(%rsp)
> >     0x236a: movq   %rax, (%rsp)
> >     0x236e: callq  0xb23d0
> >     0x2373: movq   0x8(%rsp), %rbx
> >
> > For some reason lldb seems to think all the shared libraries are loaded
> at address 0:
> > (lldb) image list
> > [  0]                                      0x0000000000001000
> /tmp/gopath/bin/wikilinktester
> > [  1] B1B370A5-479F-3533-8AD7-97B687D4F989 0x00007fff5fc00000
> /usr/lib/dyld
> > [  2] 1866C519-C5F3-3D09-8C17-A8F703664521 0x0000000000000000
> /usr/lib/libSystem.B.dylib
> > [  3] 5C0892B8-9691-341F-9279-CA3A74D59AA0 0x0000000000000000
> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
> > [  4] FCCCC4FD-043A-30CA-9997-4211CA0E9297 0x0000000000000000
> /System/Library/Frameworks/Security.framework/Versions/A/Security
> > [  5] 45E9A2E7-99C4-36B2-BEE3-0C4E11614AD1 0x0000000000000000
> /usr/lib/system/libcache.dylib
> > [  6] E789748D-F9A7-3CFF-B317-90DF348B1E95 0x0000000000000000
> /usr/lib/system/libcommonCrypto.dylib
> > [  7] BF8FC133-EE10-3DA6-9B90-92039E28678F 0x0000000000000000
> /usr/lib/system/libcompiler_rt.dylib
> > [  8] 0C68D3A6-ACDD-3EF3-991A-CC82C32AB836 0x0000000000000000
> /usr/lib/system/libcopyfile.dylib
> > [  9] 5779FFA0-4D9A-3AD4-B7F2-618227621DC8 0x0000000000000000
> /usr/lib/system/libcorecrypto.dylib
> > [ 10] 502CF32B-669B-3709-8862-08188225E4F0 0x0000000000000000
> /usr/lib/system/libdispatch.dylib
> > [ 11] CFBBE540-D503-3AFC-B5D6-644F1E69949B 0x0000000000000000
> /usr/lib/system/libdyld.dylib
> > [ 12] 77845842-DE70-3CC5-BD01-C3D14227CED5 0x0000000000000000
> /usr/lib/system/libkeymgr.dylib
> > [ 13] 4F81CA3A-D2CE-3030-A89D-42F3DAD7BA8F 0x0000000000000000
> /usr/lib/system/liblaunch.dylib
> > [ 14] 126CA2ED-DE91-308F-8881-B9DAEC3C63B6 0x0000000000000000
> /usr/lib/system/libmacho.dylib
> > [ 15] 7AF90041-2768-378A-925A-D83161863642 0x0000000000000000
> /usr/lib/system/libquarantine.dylib
> > [ 16] 3485B5F4-6CE8-3C62-8DFD-8736ED6E8531 0x0000000000000000
> /usr/lib/system/libremovefile.dylib
> > [ 17] F153AC5B-0542-356E-88C8-20A62CA704E2 0x0000000000000000
> /usr/lib/system/libsystem_asl.dylib
> > [ 18] 9615D10A-FCA7-3BE4-AA1A-1B195DACE1A1 0x0000000000000000
> /usr/lib/system/libsystem_blocks.dylib
> > [ 19] F0635E0F-FE4B-34DB-ACF9-A58C1E9070E9 0x0000000000000000
> /usr/lib/system/libsystem_c.dylib
> > [ 20] 56F94DCE-DBDE-3615-8F07-DE6270D9F8BE 0x0000000000000000
> /usr/lib/system/libsystem_configuration.dylib
> > [ 21] 41B7C578-5A53-31C8-A96F-C73E030B0938 0x0000000000000000
> /usr/lib/system/libsystem_coreservices.dylib
> > [ 22] 155DA0A9-2046-332E-BFA3-D7974A51F731 0x0000000000000000
> /usr/lib/system/libsystem_coretls.dylib
> > [ 23] 0CEB5910-843F-315C-A1DE-5D955A48A045 0x0000000000000000
> /usr/lib/system/libsystem_dnssd.dylib
> > [ 24] 2E16C4B3-A327-3957-9C41-143911979A1E 0x0000000000000000
> /usr/lib/system/libsystem_info.dylib
> > [ 25] 16AD15EF-3DAE-3F63-9D26-26CCE1920762 0x0000000000000000
> /usr/lib/system/libsystem_kernel.dylib
> > [ 26] 1E12AB45-6D96-36D0-A226-F24D9FB0D9D6 0x0000000000000000
> /usr/lib/system/libsystem_m.dylib
> > [ 27] DDA8928B-CC0D-3255-BD8A-3FEA0982B890 0x0000000000000000
> /usr/lib/system/libsystem_malloc.dylib
> > [ 28] 6105C134-6722-3C0A-A4CE-5E1261E2E1CC 0x0000000000000000
> /usr/lib/system/libsystem_network.dylib
> > [ 29] BA58B30B-8377-3B0A-8AE3-4F84021D9D4E 0x0000000000000000
> /usr/lib/system/libsystem_networkextension.dylib
> > [ 30] 61147800-F320-3DAA-850C-BADF33855F29 0x0000000000000000
> /usr/lib/system/libsystem_notify.dylib
> > [ 31] 64E34079-D712-3D66-9CE2-418624A5C040 0x0000000000000000
> /usr/lib/system/libsystem_platform.dylib
> > [ 32] ACE90967-ECD0-3251-AEEB-461E3C6414F7 0x0000000000000000
> /usr/lib/system/libsystem_pthread.dylib
> > [ 33] 3F5E973F-C702-31AC-97BC-05F5C195683C 0x0000000000000000
> /usr/lib/system/libsystem_sandbox.dylib
> > [ 34] 581DAD0F-6B63-3A48-B63B-917AF799ABAA 0x0000000000000000
> /usr/lib/system/libsystem_secinit.dylib
> > [ 35] D0E96837-3CF6-323D-B711-6DF6F660E530 0x0000000000000000
> /usr/lib/system/libsystem_stats.dylib
> > [ 36] 840F5301-B55A-3078-90B9-FEFFD6CD741A 0x0000000000000000
> /usr/lib/system/libsystem_trace.dylib
> > [ 37] 5676F7EA-C1DF-329F-B006-D2C3022B7D70 0x0000000000000000
> /usr/lib/system/libunc.dylib
> > [ 38] BE7E51A0-B6EA-3A54-9CCA-9D88F683A6D6 0x0000000000000000
> /usr/lib/system/libunwind.dylib
> > [ 39] 5C829202-962E-3744-8B50-00D38CC88E84 0x0000000000000000
> /usr/lib/system/libxpc.dylib
> > [ 40] A260789B-D4D8-316A-9490-254767B8A5F1 0x0000000000000000
> /usr/lib/libauto.dylib
> > [ 41] 2EE8E436-5CDC-34C5-9959-5BA218D507FB 0x0000000000000000
> /usr/lib/libDiagnosticMessagesClient.dylib
> > [ 42] 3CD34752-B1F9-31D2-865D-B5B0F0BE3111 0x0000000000000000
> /usr/lib/libicucore.A.dylib
> > [ 43] 759E155D-BC42-3D4E-869B-6F57D477177C 0x0000000000000000
> /usr/lib/libobjc.A.dylib
> > [ 44] 88C7C7DE-04B8-316F-8B74-ACD9F3DE1AA1 0x0000000000000000
> /usr/lib/libz.1.dylib
> > [ 45] A3A2E56C-2B65-37C7-B43A-A1F926E1A0BB 0x0000000000000000
> /usr/lib/libbsm.0.dylib
> > [ 46] 7CD69BB5-97BA-3858-8A8B-2F33F129E6E7 0x0000000000000000
> /usr/lib/libxar.1.dylib
> > [ 47] BCB1F77E-2484-3EC4-A1D5-1AE90A407A23 0x0000000000000000
> /usr/lib/libsqlite3.dylib
> > [ 48] E805398D-9A92-31F8-8005-8DC188BD8B6E 0x0000000000000000
> /usr/lib/libpam.2.dylib
> > [ 49] 09C0518C-90DF-3FC3-96D6-34D35F72C8EF 0x0000000000000000
> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
> > [ 50] D6A2216D-ADB2-3F24-AD30-F6D00829F545 0x0000000000000000
> /usr/lib/libOpenScriptingUtil.dylib
> > [ 51] 1B9530FD-989B-3174-BB1C-BDC159501710 0x0000000000000000
> /usr/lib/libc++.1.dylib
> > [ 52] 88A22A0F-87C6-3002-BFBA-AC0F2808B8B9 0x0000000000000000
> /usr/lib/libc++abi.dylib
> > [ 53] 2DF83FBC-5C08-39E1-94F5-C28653791B5F 0x0000000000000000
> /usr/lib/libbz2.1.0.dylib
> > [ 54] 3FBA890F-2850-3A45-87EA-DB6892BDEB60 0x0000000000000000
> /usr/lib/libxml2.2.dylib
> > [ 55] 2ADAE067-78A0-371E-A5A8-1E7C892D193C 0x0000000000000000
> /usr/lib/system/libkxld.dylib
> >
> > Any idea what's going on here?
> >
> > _______________________________________________
> > lldb-dev mailing list
> > lldb-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>
>
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