Bug 362920

Summary: valgrind refuses to execute pkcs11-tool binary from OpenSC: assertion 'tst->os_state.pthread - magic_delta == self' failed
Product: [Developer tools] valgrind Reporter: Uri <uri>
Component: memcheckAssignee: Rhys Kidd <rhyskidd>
Status: RESOLVED DUPLICATE    
Severity: crash CC: rhyskidd
Priority: NOR    
Version: 3.11.0   
Target Milestone: ---   
Platform: MacPorts   
OS: macOS   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Uri 2016-05-11 03:41:16 UTC 
I have built OpenSC from master branch on Github.com/OpenSC/OpenSC. I am trying to verify its memory usage with valgrind.  I am trying to execute command

valgrind pkcs11-tool -t -l  

to perform pkcs11 tests. It fails with this assertion:

valgrind: m_syswrap/syswrap-amd64-darwin.c:507 (void wqthread_hijack(Addr, Addr, Addr, Addr, Int, Addr)): Assertion 'tst->os_state.pthread - magic_delta == self' failed

Reproducible: Always

Steps to Reproduce:
1. On Mac OS X 10.11.4 with Xcode-7.3.1 install valgrind via Macports.
2. Clone, build and install https://Github.com/OpenSC/OpenSC.git
3. Run "valgrind pkcs11-tool -t -l"

Actual Results:  
$ valgrind pkcs11-tool -t -l
==23584== Memcheck, a memory error detector
==23584== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==23584== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==23584== Command: pkcs11-tool -t -l
==23584==
--23584-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option
--23584-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option (repeated 2 times)
--23584-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option (repeated 4 times)

valgrind: m_syswrap/syswrap-amd64-darwin.c:507 (void wqthread_hijack(Addr, Addr, Addr, Addr, Int, Addr)): Assertion 'tst->os_state.pthread - magic_delta == self' failed.

host stacktrace:
==23584==    at 0x23803FC97: ???
==23584==    by 0x238040094: ???
==23584==    by 0x238040077: ???
==23584==    by 0x2380DE3E1: ???

sched status:
  running_tid=0

Thread 1: status = VgTs_WaitSys (lwpid 2567)
==23584==    at 0x1007C8FAE: semaphore_wait_trap (in /usr/lib/system/libsystem_kernel.dylib)
==23584==    by 0x1005D7CB1: _dispatch_semaphore_wait_slow (in /usr/lib/system/libdispatch.dylib)
==23584==    by 0x100986EA4: xpc_connection_send_message_with_reply_sync (in /usr/lib/system/libxpc.dylib)
==23584==    by 0x1015877FD: transact (in /System/Library/Frameworks/PCSC.framework/Versions/A/PCSC)
==23584==    by 0x1000806AC: pcsc_detect_readers (in /Library/OpenSC/lib/libopensc.4.dylib)
==23584==    by 0x10003596D: sc_ctx_detect_readers (in /Library/OpenSC/lib/libopensc.4.dylib)
==23584==    by 0x100035D80: sc_context_create (in /Library/OpenSC/lib/libopensc.4.dylib)
==23584==    by 0x10154FBC4: C_Initialize (in /Library/OpenSC/lib/opensc-pkcs11.so)
==23584==    by 0x100001CAF: main (in /usr/local/bin/pkcs11-tool)

Thread 2: status = VgTs_WaitSys (lwpid 3587)
==23584==    at 0x1007CF5E2: __workq_kernreturn (in /usr/lib/system/libsystem_kernel.dylib)
==23584==    by 0x2380DE3E1: ???
==23584==    by 0x2382001AF: ???
==23584==    by 0x70000311EDAF: ???
==23584==    by 0x70000000BABF: ???

Thread 3: status = VgTs_WaitSys (lwpid 6147)
==23584==    at 0x1007C8F72: mach_msg_trap (in /usr/lib/system/libsystem_kernel.dylib)
==23584==    by 0x1007C83B2: mach_msg (in /usr/lib/system/libsystem_kernel.dylib)
==23584==    by 0x1007BE03B: _kernelrpc_mach_port_request_notification (in /usr/lib/system/libsystem_kernel.dylib)
==23584==    by 0x1005D4FCC: _dispatch_kevent_mach_notify_resume (in /usr/lib/system/libdispatch.dylib)
==23584==    by 0x1005D51BC: _dispatch_kevent_unregister (in /usr/lib/system/libdispatch.dylib)
==23584==    by 0x1005D3FD1: _dispatch_mach_msg_send (in /usr/lib/system/libdispatch.dylib)
==23584==    by 0x1005D3A20: _dispatch_mach_msg_send (in /usr/lib/system/libdispatch.dylib)
==23584==    by 0x1005D4B23: _dispatch_mach_send_drain (in /usr/lib/system/libdispatch.dylib)
==23584==    by 0x1005D3458: _dispatch_mach_invoke (in /usr/lib/system/libdispatch.dylib)
==23584==    by 0x1005D11FF: _dispatch_queue_drain (in /usr/lib/system/libdispatch.dylib)
==23584==    by 0x1005D21DE: _dispatch_mgr_queue_drain (in /usr/lib/system/libdispatch.dylib)
==23584==    by 0x1005D20B9: _dispatch_mgr_invoke (in /usr/lib/system/libdispatch.dylib)
==23584==    by 0x1005D1DCC: _dispatch_mgr_thread (in /usr/lib/system/libdispatch.dylib)


Note: see also the FAQ in the source distribution.
It contains workarounds to several common problems.
In particular, if Valgrind aborted or crashed after
identifying problems in your program, there's a good chance
that fixing those problems will prevent Valgrind aborting or
crashing, especially if it happened in m_mallocfree.c.

If that doesn't help, please report this bug to: www.valgrind.org

In the bug report, send all the above text, the valgrind
version, and what OS and version you are using.  Thanks.

$

Expected Results:  
Valgrind analysis of memory usage by pkcs11-tool and dynamic libraries it loads.

Mac OS X 10.11.4. Xcode-7.3.1. OpenSC master branch (probably less relevant).
Valgrind-3.11.0 installed by Macports.
Comment 1 Uri 2016-05-11 03:51:28 UTC 
$ uname -a
Darwin Uris-MacBook-Air.local 15.4.0 Darwin Kernel Version 15.4.0: Fri Feb 26 22:08:05 PST 2016; root:xnu-3248.40.184~3/RELEASE_X86_64 x86_64
$ valgrind -v pkcs11-tool -t -l
==23708== Memcheck, a memory error detector
==23708== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==23708== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==23708== Command: pkcs11-tool -t -l
==23708==
--23708-- Valgrind options:
--23708--    -v
--23708-- Output from sysctl({CTL_KERN,KERN_VERSION}):
--23708--   Darwin Kernel Version 15.4.0: Fri Feb 26 22:08:05 PST 2016; root:xnu-3248.40.184~3/RELEASE_X86_64
--23708-- Arch and hwcaps: AMD64, LittleEndian, amd64-cx16-lzcnt-rdtscp-sse3-avx-avx2-bmi
--23708-- Page sizes: currently 4096, max supported 4096
--23708-- Valgrind library directory: /opt/local/lib/valgrind
--23708-- /usr/local/bin/pkcs11-tool (rx at 0x100000000, rw at 0x10001b000)
--23708--    reading syms   from primary file (20 142)
--23708-- /usr/lib/dyld (rx at 0x7fff5fc00000, rw at 0x7fff5fc38000)
--23708--    reading syms   from primary file (6 1226)
--23708-- Scheduler: using generic scheduler lock implementation.
--23708-- Reading suppressions file: /opt/local/lib/valgrind/default.supp
==23708== embedded gdbserver: reading from /var/folders/pd/mxn5kp_55jg23x7jjd10gtwm0000gn/T//vgdb-pipe-from-vgdb-to-23708-by-uri-on-???
==23708== embedded gdbserver: writing to   /var/folders/pd/mxn5kp_55jg23x7jjd10gtwm0000gn/T//vgdb-pipe-to-vgdb-from-23708-by-uri-on-???
==23708== embedded gdbserver: shared mem   /var/folders/pd/mxn5kp_55jg23x7jjd10gtwm0000gn/T//vgdb-pipe-shared-mem-vgdb-23708-by-uri-on-???
==23708==
==23708== TO CONTROL THIS PROCESS USING vgdb (which you probably
==23708== don't want to do, unless you know exactly what you're doing,
==23708== or are doing some strange experiment):
==23708==   /opt/local/lib/valgrind/../../bin/vgdb --pid=23708 ...command...
==23708==
==23708== TO DEBUG THIS PROCESS USING GDB: start GDB like this
==23708==   /path/to/gdb pkcs11-tool
==23708== and then give GDB the following command
==23708==   target remote | /opt/local/lib/valgrind/../../bin/vgdb --pid=23708
==23708== --pid is optional if only one valgrind process is running
==23708==
--23708-- REDIR: 0x7fff5fc1e679 (dyld:arc4random) redirected to 0x23805a8de (???)
--23708-- REDIR: 0x7fff5fc24840 (dyld:strcmp) redirected to 0x23805a840 (???)
--23708-- REDIR: 0x7fff5fc21ddf (dyld:strlcat) redirected to 0x23805a879 (???)
--23708-- REDIR: 0x7fff5fc1e440 (dyld:strlen) redirected to 0x23805a80f (???)
--23708-- REDIR: 0x7fff5fc1e3a0 (dyld:strcpy) redirected to 0x23805a85c (???)
--23708-- REDIR: 0x7fff5fc21d9f (dyld:strcat) redirected to 0x23805a820 (???)
--23708-- /opt/local/lib/valgrind/vgpreload_core-amd64-darwin.so (rx at 0x100022000, rw at 0x100024000)
--23708--    reading syms   from primary file (3 47)
--23708--    dSYM= /opt/local/lib/valgrind/vgpreload_core-amd64-darwin.so.dSYM/Contents/Resources/DWARF/vgpreload_core-amd64-darwin.so
--23708--    reading dwarf3 from dsyms file
--23708-- /opt/local/lib/valgrind/vgpreload_memcheck-amd64-darwin.so (rx at 0x100026000, rw at 0x10002c000)
--23708--    reading syms   from primary file (72 356)
--23708--    dSYM= /opt/local/lib/valgrind/vgpreload_memcheck-amd64-darwin.so.dSYM/Contents/Resources/DWARF/vgpreload_memcheck-amd64-darwin.so
--23708--    reading dwarf3 from dsyms file
--23708-- /Library/OpenSC/lib/libopensc.4.dylib (rx at 0x100032000, rw at 0x100245000)
--23708--    reading syms   from primary file (335 2738)
--23708-- /opt/local/lib/libssl.1.0.0.dylib (rx at 0x100282000, rw at 0x1002c6000)
--23708--    reading syms   from primary file (592 154)
--23708-- /opt/local/lib/libcrypto.1.0.0.dylib (rx at 0x1002e1000, rw at 0x100463000)
--23708--    reading syms   from primary file (4157 1869)
--23708-- /opt/local/lib/libz.1.2.8.dylib (rx at 0x1004d8000, rw at 0x1004e9000)
--23708--    reading syms   from primary file (80 65)
--23708-- /usr/lib/libSystem.B.dylib (rx at 0x1004ec000, rw at 0x1004ee000)
--23708--    reading syms   from primary file (31 5)
--23708-- /usr/lib/system/libcache.dylib (rx at 0x1004f3000, rw at 0x1004f8000)
--23708--    reading syms   from primary file (32 30)
--23708-- /usr/lib/system/libcommonCrypto.dylib (rx at 0x1004fd000, rw at 0x100509000)
--23708--    reading syms   from primary file (214 188)
--23708-- /usr/lib/system/libcompiler_rt.dylib (rx at 0x100516000, rw at 0x10051e000)
--23708--    reading syms   from primary file (510 8)
--23708-- /usr/lib/system/libcopyfile.dylib (rx at 0x10052b000, rw at 0x100534000)
--23708--    reading syms   from primary file (13 35)
--23708-- /usr/lib/system/libcorecrypto.dylib (rx at 0x10053a000, rw at 0x1005b2000)
--23708--    reading syms   from primary file (430 601)
--23708-- /usr/lib/system/libdispatch.dylib (rx at 0x1005ca000, rw at 0x1005f8000)
--23708--    reading syms   from primary file (215 832)
--23708-- /usr/lib/system/libdyld.dylib (rx at 0x100621000, rw at 0x100625000)
--23708--    reading syms   from primary file (80 109)
--23708-- /usr/lib/system/libkeymgr.dylib (rx at 0x10062c000, rw at 0x10062d000)
--23708--    reading syms   from primary file (12 3)
--23708-- /usr/lib/system/libmacho.dylib (rx at 0x100638000, rw at 0x10063e000)
--23708--    reading syms   from primary file (97 1)
--23708-- /usr/lib/system/libquarantine.dylib (rx at 0x100644000, rw at 0x100647000)
--23708--    reading syms   from primary file (67 32)
--23708-- /usr/lib/system/libremovefile.dylib (rx at 0x10064d000, rw at 0x10064f000)
--23708--    reading syms   from primary file (15 4)
--23708-- /usr/lib/system/libsystem_asl.dylib (rx at 0x100654000, rw at 0x10066c000)
--23708--    reading syms   from primary file (222 225)
--23708-- /usr/lib/system/libsystem_blocks.dylib (rx at 0x100679000, rw at 0x10067b000)
--23708--    reading syms   from primary file (25 22)
--23708-- /usr/lib/system/libsystem_c.dylib (rx at 0x10067f000, rw at 0x10070d000)
--23708--    reading syms   from primary file (1303 748)
--23708-- /usr/lib/system/libsystem_configuration.dylib (rx at 0x100738000, rw at 0x10073b000)
--23708--    reading syms   from primary file (28 57)
--23708-- /usr/lib/system/libsystem_coreservices.dylib (rx at 0x100741000, rw at 0x100744000)
--23708--    reading syms   from primary file (13 30)
--23708-- /usr/lib/system/libsystem_coretls.dylib (rx at 0x100749000, rw at 0x100761000)
--23708--    reading syms   from primary file (118 233)
--23708-- /usr/lib/system/libsystem_dnssd.dylib (rx at 0x10076a000, rw at 0x100773000)
--23708--    reading syms   from primary file (68 33)
--23708-- /usr/lib/system/libsystem_info.dylib (rx at 0x100779000, rw at 0x1007a3000)
--23708--    reading syms   from primary file (526 527)
--23708-- /usr/lib/system/libsystem_kernel.dylib (rx at 0x1007b8000, rw at 0x1007d7000)
--23708--    reading syms   from primary file (1069 84)
--23708-- /usr/lib/system/libsystem_m.dylib (rx at 0x1007ec000, rw at 0x10081c000)
--23708--    reading syms   from primary file (593 1)
--23708-- /usr/lib/system/libsystem_malloc.dylib (rx at 0x100828000, rw at 0x100845000)
--23708--    reading syms   from primary file (102 201)
--23708-- /usr/lib/system/libsystem_network.dylib (rx at 0x10084e000, rw at 0x1008b5000)
--23708--    reading syms   from primary file (686 2055)
--23708-- /usr/lib/system/libsystem_networkextension.dylib (rx at 0x1008ec000, rw at 0x1008f5000)
--23708--    reading syms   from primary file (85 236)
--23708-- /usr/lib/system/libsystem_notify.dylib (rx at 0x100900000, rw at 0x10090a000)
--23708--    reading syms   from primary file (136 53)
--23708-- /usr/lib/system/libsystem_platform.dylib (rx at 0x100912000, rw at 0x10091b000)
--23708--    reading syms   from primary file (142 158)
--23708-- /usr/lib/system/libsystem_pthread.dylib (rx at 0x100923000, rw at 0x10092d000)
--23708--    reading syms   from primary file (163 70)
--23708-- /usr/lib/system/libsystem_sandbox.dylib (rx at 0x10093a000, rw at 0x10093e000)
--23708--    reading syms   from primary file (80 7)
--23708-- /usr/lib/system/libsystem_secinit.dylib (rx at 0x100944000, rw at 0x100946000)
--23708--    reading syms   from primary file (3 6)
--23708-- /usr/lib/system/libsystem_trace.dylib (rx at 0x10094b000, rw at 0x10095d000)
--23708--    reading syms   from primary file (94 351)
--23708-- /usr/lib/system/libunwind.dylib (rx at 0x10096f000, rw at 0x100975000)
--23708--    reading syms   from primary file (102 52)
--23708-- /usr/lib/system/libxpc.dylib (rx at 0x10097c000, rw at 0x1009a6000)
--23708--    reading syms   from primary file (503 833)
--23708-- /usr/lib/libobjc.A.dylib (rx at 0x1009c4000, rw at 0x100d27000)
--23708--    reading syms   from primary file (347 935)
--23708-- /usr/lib/libauto.dylib (rx at 0x100e03000, rw at 0x100e4a000)
--23708--    reading syms   from primary file (68 658)
--23708-- /usr/lib/libc++abi.dylib (rx at 0x100e5f000, rw at 0x100e89000)
--23708--    reading syms   from primary file (337 181)
--23708-- /usr/lib/libc++.1.dylib (rx at 0x100e97000, rw at 0x100eeb000)
--23708--    reading syms   from primary file (1960 1590)
--23708-- /usr/lib/libDiagnosticMessagesClient.dylib (rx at 0x100f47000, rw at 0x100f49000)
--23708--    reading syms   from primary file (21 14)
--23708-- REDIR: 0x100912ba0 (libsystem_platform.dylib:_platform_memchr$VARIANT$Haswell) redirected to 0x100029b57 (_platform_memchr$VARIANT$Haswell)
--23708-- REDIR: 0x100912c80 (libsystem_platform.dylib:_platform_memcmp) redirected to 0x10002a093 (_platform_memcmp)
--23708-- REDIR: 0x100913220 (libsystem_platform.dylib:_platform_strncmp) redirected to 0x100029a09 (_platform_strncmp)
--23708-- REDIR: 0x1008290a2 (libsystem_malloc.dylib:malloc) redirected to 0x100027e0a (malloc)
--23708-- REDIR: 0x100680140 (libsystem_c.dylib:strlen) redirected to 0x100029684 (strlen)
--23708-- REDIR: 0x100913800 (libsystem_platform.dylib:_platform_strcmp) redirected to 0x100029aa9 (_platform_strcmp)
--23708-- REDIR: 0x10082be98 (libsystem_malloc.dylib:free) redirected to 0x10002824a (free)
--23708-- REDIR: 0x10082e431 (libsystem_malloc.dylib:calloc) redirected to 0x1000284c2 (calloc)
--23708-- REDIR: 0x10082d939 (libsystem_malloc.dylib:malloc_default_zone) redirected to 0x100029274 (malloc_default_zone)
--23708-- REDIR: 0x10082a55a (libsystem_malloc.dylib:malloc_zone_malloc) redirected to 0x1000280be (malloc_zone_malloc)
--23708-- REDIR: 0x10082d958 (libsystem_malloc.dylib:malloc_zone_calloc) redirected to 0x1000286c4 (malloc_zone_calloc)
--23708-- REDIR: 0x10082da12 (libsystem_malloc.dylib:malloc_zone_from_ptr) redirected to 0x1000292b5 (malloc_zone_from_ptr)
--23708-- REDIR: 0x100913400 (libsystem_platform.dylib:_platform_strchr$VARIANT$Haswell) redirected to 0x10002954a (_platform_strchr$VARIANT$Haswell)
--23708-- REDIR: 0x10082e634 (libsystem_malloc.dylib:realloc) redirected to 0x100028866 (realloc)
--23708-- REDIR: 0x1008309e0 (libsystem_malloc.dylib:malloc_zone_memalign) redirected to 0x100028e0c (malloc_zone_memalign)
--23708-- /Library/OpenSC/lib/opensc-pkcs11.so (rx at 0x10154f000, rw at 0x10157a000)
--23708--    reading syms   from primary file (68 350)
--23708-- /System/Library/Frameworks/PCSC.framework/Versions/A/PCSC (rx at 0x101586000, rw at 0x101591000)
--23708--    reading syms   from primary file (103 109)
--23708-- /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (rx at 0x101599000, rw at 0x101a10000)
--23708--    reading syms   from primary file (2653 7425)
--23708-- /usr/lib/libicucore.A.dylib (rx at 0x101c8e000, rw at 0x101e9c000)
--23708--    reading syms   from primary file (6525 1)
--23708-- /usr/lib/libz.1.dylib (rx at 0x101f62000, rw at 0x101f74000)
--23708--    reading syms   from primary file (65 1)
--23708-- REDIR: 0x1006db01a (libsystem_c.dylib:strrchr) redirected to 0x1000294d4 (strrchr)
--23708-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option
--23708-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option (repeated 2 times)
--23708-- UNKNOWN mach_msg unhandled MACH_SEND_TRAILER option (repeated 4 times)

valgrind: m_syswrap/syswrap-amd64-darwin.c:507 (void wqthread_hijack(Addr, Addr, Addr, Addr, Int, Addr)): Assertion 'tst->os_state.pthread - magic_delta == self' failed.

host stacktrace:
==23708==    at 0x23803FC97: ???
==23708==    by 0x238040094: ???
==23708==    by 0x238040077: ???
==23708==    by 0x2380DE3E1: ???

sched status:
  running_tid=0

Thread 1: status = VgTs_WaitSys (lwpid 2567)
==23708==    at 0x1007C8FAE: semaphore_wait_trap (in /usr/lib/system/libsystem_kernel.dylib)
==23708==    by 0x1005D7CB1: _dispatch_semaphore_wait_slow (in /usr/lib/system/libdispatch.dylib)
==23708==    by 0x100986EA4: xpc_connection_send_message_with_reply_sync (in /usr/lib/system/libxpc.dylib)
==23708==    by 0x1015877FD: transact (in /System/Library/Frameworks/PCSC.framework/Versions/A/PCSC)
==23708==    by 0x1000806AC: pcsc_detect_readers (in /Library/OpenSC/lib/libopensc.4.dylib)
==23708==    by 0x10003596D: sc_ctx_detect_readers (in /Library/OpenSC/lib/libopensc.4.dylib)
==23708==    by 0x100035D80: sc_context_create (in /Library/OpenSC/lib/libopensc.4.dylib)
==23708==    by 0x10154FBC4: C_Initialize (in /Library/OpenSC/lib/opensc-pkcs11.so)
==23708==    by 0x100001CAF: main (in /usr/local/bin/pkcs11-tool)

Thread 2: status = VgTs_WaitSys (lwpid 3587)
==23708==    at 0x1007CF5E2: __workq_kernreturn (in /usr/lib/system/libsystem_kernel.dylib)
==23708==    by 0x2380DE3E1: ???
==23708==    by 0x2382001AF: ???
==23708==    by 0x70000311EDAF: ???
==23708==    by 0x70000000BB1F: ???

Thread 3: status = VgTs_WaitSys (lwpid 6147)
==23708==    at 0x1007C8F72: mach_msg_trap (in /usr/lib/system/libsystem_kernel.dylib)
==23708==    by 0x1007C83B2: mach_msg (in /usr/lib/system/libsystem_kernel.dylib)
==23708==    by 0x1007BE03B: _kernelrpc_mach_port_request_notification (in /usr/lib/system/libsystem_kernel.dylib)
==23708==    by 0x1005D4FCC: _dispatch_kevent_mach_notify_resume (in /usr/lib/system/libdispatch.dylib)
==23708==    by 0x1005D51BC: _dispatch_kevent_unregister (in /usr/lib/system/libdispatch.dylib)
==23708==    by 0x1005D3FD1: _dispatch_mach_msg_send (in /usr/lib/system/libdispatch.dylib)
==23708==    by 0x1005D3A20: _dispatch_mach_msg_send (in /usr/lib/system/libdispatch.dylib)
==23708==    by 0x1005D4B23: _dispatch_mach_send_drain (in /usr/lib/system/libdispatch.dylib)
==23708==    by 0x1005D3458: _dispatch_mach_invoke (in /usr/lib/system/libdispatch.dylib)
==23708==    by 0x1005D11FF: _dispatch_queue_drain (in /usr/lib/system/libdispatch.dylib)
==23708==    by 0x1005D21DE: _dispatch_mgr_queue_drain (in /usr/lib/system/libdispatch.dylib)
==23708==    by 0x1005D20B9: _dispatch_mgr_invoke (in /usr/lib/system/libdispatch.dylib)
==23708==    by 0x1005D1DCC: _dispatch_mgr_thread (in /usr/lib/system/libdispatch.dylib)


Note: see also the FAQ in the source distribution.
It contains workarounds to several common problems.
In particular, if Valgrind aborted or crashed after
identifying problems in your program, there's a good chance
that fixing those problems will prevent Valgrind aborting or
crashing, especially if it happened in m_mallocfree.c.

If that doesn't help, please report this bug to: www.valgrind.org

In the bug report, send all the above text, the valgrind
version, and what OS and version you are using.  Thanks.

$
Comment 2 Rhys Kidd 2016-05-27 20:15:16 UTC 
Hello Uri,
Thanks for the report. This is a known bug. Closing and adding a reference to the main bug tracking this #354883

*** This bug has been marked as a duplicate of bug 354883 ***