Date: Mon, 13 Nov 2017 09:54:30 -0600 From: Karl Denninger <karl@denninger.net> To: freebsd-arm@freebsd.org Subject: Re: Very bizarre behavior ARM64 (Pi3) Message-ID: <1aa5d05e-d5cb-4e46-4d94-e9e51339ca0c@denninger.net> In-Reply-To: <7caae80e-876f-631c-23a9-957db7d7ddd5@denninger.net> References: <7caae80e-876f-631c-23a9-957db7d7ddd5@denninger.net>
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This is a cryptographically signed message in MIME format. --------------ms010708020002080602010301 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 11/12/2017 12:02, Karl Denninger wrote: > I managed to get around the Crochet blow-up I reported the other day > with another svn update, and now can Crochet myself a running image for= > the Pi3 which boots and (at least at first blush) works. > > But I have code that has been running on the Pi3 (and also on the Pi2, > along with other architectures) for quite some time that no longer runs= > when compiled on that newly-built OS.=C2=A0 It compiles without warning= s or > errors but blows up immediately when executed. > > I just tried to roll that build forward to the newly-built (FreeBSD > 12.0-CURRENT #0 r325681M: Fri Nov 10 19:31:28 CST 2017)=C2=A0 -HEAD and= am > getting really bizarre core dumps, including (if compiled using OpenSSL= > libraries) a crash on initialization claiming unknown opcodes in the > compiled binary. > > root@rpi3:/data/HD-MCP # lldb hd-mcp > (lldb) target create "hd-mcp" > Current executable set to 'hd-mcp' (aarch64). > (lldb) run -n > Process 1101 launching > Process 1101 launched: '/data/HD-MCP/hd-mcp' (aarch64) > Process 1101 stopped > * thread #1, name =3D 'hd-mcp', stop reason =3D signal SIGILL: illegal = trap > =C2=A0=C2=A0=C2=A0 frame #0: 0x00000000403342e8 > ->=C2=A0 0x403342e8: .long=C2=A0 0x0ee0e000=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ; unknown op= code > =C2=A0=C2=A0=C2=A0 0x403342ec: ret > =C2=A0=C2=A0=C2=A0 0x403342f0: stp=C2=A0=C2=A0=C2=A0 x28, x19, [sp, #-0= x20]! > =C2=A0=C2=A0=C2=A0 0x403342f4: stp=C2=A0=C2=A0=C2=A0 x29, x30, [sp, #0x= 10] > (lldb) bt > * thread #1, name =3D 'hd-mcp', stop reason =3D signal SIGILL: illegal = trap > =C2=A0 * frame #0: 0x00000000403342e8 > =C2=A0=C2=A0=C2=A0 frame #1: 0x0000000040082ad8 > =C2=A0=C2=A0=C2=A0 frame #2: 0x0000000040081ab4 > (lldb) > > If I compile and link with OpenSSL omitted (which is an option in the > software in question) then I get blowups shortly after the software > starts implying the stack is getting smashed in bizarre ways that don't= > make any sense. > > The same source has been running for months uninterrupted on 11.x hoste= d > on a Pi2 and used to run just fine on a Pi3 from a build I last updated= > back in February. > > To top it off lldb blows up if I set a breakpoint (or get a SEGV and > trap back to it) and try to print anything out of the current frame > (e.g. the variables in the function that blew) so it's basically > impossible to figure out what's getting hammered in the stack if I leav= e > the OpenSSL libraries out. > > Are there known issues with the arm64 architecture in -HEAD at present?= I MAY know what is going on here; see this report: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D223653 If I link without OpenSSL (no -lcrypto and no -lssl) then my code runs fine (I have a build-time option to not use encryption of any sort for demonstration reasons.)=C2=A0 But even attempting to link the SSL librari= es causes the above blowup in front of main(); a breakpoint on the first actual statement in main() (which is an initialization of a variable) is not reached; the trap comes first. Why the above behavior would cause code linked with SSL libraries to blow up on start I do not know, and there is nothing in the backtrace that helps me identify exactly where it dies...... --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms010708020002080602010301 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw FwYDVQQKDBBDdWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExITAf BgNVBAMMGEN1ZGEgU3lzdGVtcyBMTEMgMjAxNyBDQTAeFw0xNzA4MTcxNjQyMTdaFw0yNzA4 MTUxNjQyMTdaMHsxCzAJBgNVBAYTAlVTMRAwDgYDVQQIDAdGbG9yaWRhMRkwFwYDVQQKDBBD 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