Illegal instruction on new port mongodb49 on arm64

[Ronald Klop]

Van: "Micha? Górny" <mgorny at gentoo.org>
Datum: donderdag, 1 april 2021 10:47
Aan: Ronald Klop <ronald-lists at klop.ws>, freebsd-ports at freebsd.org, freebsd-arm at freebsd.org
Onderwerp: Re: Illegal instruction on new port mongodb49 on arm64
> 
> On Thu, 2021-04-01 at 10:37 +0200, Ronald Klop wrote:
> > Hi,
> >
> > I created a new port for mongodb49: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254631
> > It compiles fine: https://www.klop.ws/mongodb49-4.9.0.r0.log
> >
> > When I run an application I get "Illegal Instruction" error.
> >
> > ==============================================================
> > [root at rpi4 /tmp]# lldb /usr/local/bin/mongo
> > (lldb) target create "/usr/local/bin/mongo"
> > Current executable set to '/usr/local/bin/mongo' (aarch64).
> > (lldb) run
> > Process 55420 launching
> > Process 55420 launched: '/usr/local/bin/mongo' (aarch64)
> > Process 55420 stopped
> > * thread #1, name = 'mongo', stop reason = signal SIGILL: illegal trap
> >     frame #0: 0x00000000016a320c mongo`___lldb_unnamed_symbol32$$mongo + 1784
> > mongo`___lldb_unnamed_symbol32$$mongo:
> > ->  0x16a320c <+1784>: ldaddal x9, x8, [x8]
> 
> According to [1], this instruction requires ARMv8.1.  If I grep
> correctly, rpi4 is ARMv8-A.  Yet you're compiling with -march=armv8.2-a,
> so it's a case of wrong -march.
> 
> [1] https://developer.arm.com/documentation/100069/0608/A64-Data-Transfer-Instructions/LDADDA--LDADDAL--LDADD--LDADDL--LDADDAL--LDADD--LDADDL
> 
> -- 
> Best regards,
> Micha Górny
> 
>  
> 
> 
> 


Hi,

Thank you for the quick insight.
Now I found this update upstream: https://jira.mongodb.org/browse/SERVER-55178 and https://github.com/mongodb/mongo/commit/8f708f3b68c3c85108294a8f58d780b6ccf18194 .
Not much info why this was necessary though. I hate it when a commit message describes *what* changed instead of *why* it changed. The what is already in the diff.

Anyways. Thanks for the reply. I think I'll need to try to contact somebody at MongoDB.

Regards,
Ronald.