Not work on macOS 10.15.2

[ufosky]

When I upgrade my system to 10.15.2, valgrind always run with errors

/usr/local/bin/valgrind --tool=memcheck --xml=yes --xml-file=/private/var/folders/hf/fhwvc13x03s0pbqyg6vc1w3h1st3ld/T/valgrind --gen-suppressions=all --leak-check=full --leak-resolution=med --track-origins=yes --vgdb=no test_program

--85493-- UNKNOWN fcntl 101!
--85493-- UNKNOWN fcntl 101! (repeated 2 times)
--85493-- UNKNOWN fcntl 101! (repeated 4 times)
--85493-- UNKNOWN fcntl 101! (repeated 8 times)
--85493-- UNKNOWN fcntl 101! (repeated 16 times)
--85493-- UNKNOWN fcntl 101! (repeated 32 times)
--85493-- UNKNOWN fcntl 101! (repeated 64 times)
==85493== valgrind: Unrecognised instruction at address 0x101caf7bd.
==85493== Your program just tried to execute an instruction that Valgrind
==85493== did not recognise.  There are two possible reasons for this.
==85493== 1. Your program has a bug and erroneously jumped to a non-code
==85493==    location.  If you are running Memcheck and you just saw a
==85493==    warning about a bad jump, it's probably your program's fault.
==85493== 2. The instruction is legitimate but Valgrind doesn't handle it,
==85493==    i.e. it's Valgrind's fault.  If you think this is the case or
==85493==    you are not sure, please let us know and we'll try to fix it.
==85493== Either way, Valgrind will now raise a SIGILL signal which will
==85493== probably kill your program.

[biocyberman]

Related? https://stackoverflow.com/questions/36893494/valgrind-shows-memory-leak-with-empty-main-without-including-headers

[eichelberg]

I can confirm this issue, which also affects MacOS 10.15.3.
The unrecognized instruction is reported in __pthread_init.cold.2 (in /usr/lib/system/libsystem_pthread.dylib).

[saiprasadjnv]

Is there a fix for this?

[Neight99]

I can also comfirm this issue on macOS 10.15.3 in __pthread_init.cold.2 (in /usr/lib/system/libsystem_pthread.dylib).

[andrewlvovsky]

Same issue on macOS 10.15.4, same area as with @Neight99

[axelkennedal]

Same issue on macOS 10.15.4:

--91829-- UNKNOWN fcntl 101!
--91829-- UNKNOWN fcntl 101! (repeated 2 times)
--91829-- UNKNOWN fcntl 101! (repeated 4 times)
--91829-- UNKNOWN fcntl 101! (repeated 8 times)
--91829-- UNKNOWN fcntl 101! (repeated 16 times)
--91829-- UNKNOWN fcntl 101! (repeated 32 times)
==91829== valgrind: Unrecognised instruction at address 0x1007a27bd.

[atiwari3bu]

+1

==17475== 
--17475-- UNKNOWN fcntl 101!
--17475-- UNKNOWN fcntl 101! (repeated 2 times)
--17475-- UNKNOWN fcntl 101! (repeated 4 times)
--17475-- UNKNOWN fcntl 101! (repeated 8 times)
--17475-- UNKNOWN fcntl 101! (repeated 16 times)
--17475-- UNKNOWN fcntl 101! (repeated 32 times)
==17475== valgrind: Unrecognised instruction at address 0x1007547bd.

[jpflori]

The unsupported instruction might be ud2:
https://forums.developer.apple.com/thread/128263

[dzpt]

Any fix for this?

[emeryberger]

Ditto for 10.15.5:

--52877-- UNKNOWN fcntl 101!
--52877-- UNKNOWN fcntl 101! (repeated 2 times)
--52877-- UNKNOWN fcntl 101! (repeated 4 times)
--52877-- UNKNOWN fcntl 101! (repeated 8 times)
--52877-- UNKNOWN fcntl 101! (repeated 16 times)
--52877-- UNKNOWN fcntl 101! (repeated 32 times)
==52877== valgrind: Unrecognised instruction at address 0x1006f3a73.

[paultomas]

Same for 10.15.6:

--97377-- UNKNOWN fcntl 101!
--97377-- UNKNOWN fcntl 101! (repeated 2 times)
--97377-- UNKNOWN fcntl 101! (repeated 4 times)
--97377-- UNKNOWN fcntl 101! (repeated 8 times)
--97377-- UNKNOWN fcntl 101! (repeated 16 times)
--97377-- UNKNOWN fcntl 101! (repeated 32 times)
==97377== valgrind: Unrecognised instruction at address 0x1024f8a73.