Date: Sun, 14 Apr 2024 12:17:22 +0000 From: John F Carr <jfc@mit.edu> To: "tuexen@freebsd.org" <tuexen@freebsd.org> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: Loading vmm Message-ID: <08796868-9E24-4BFE-AE96-F8B4A7FB6C0A@mit.edu> In-Reply-To: <760D76E5-F2D5-4D0D-9CDC-A42D3335C9DA@freebsd.org> References: <760D76E5-F2D5-4D0D-9CDC-A42D3335C9DA@freebsd.org>
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See bug https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D277559. It was= suspected to be specific to the heterogenous Rockchip RK3399 but perhaps i= t is more widespread. When I first hit the bug there was a 30-50% chance that the first kldload v= mm would hang the system so hard I couldn't even invoke the debugger with b= reak on a serial console. Later, with no relevant changes to source code, = it would take about 2,000 load/unload pairs to hang the system. If that 1-= in-2000 chance is typical this bug could affect all systems. Give it a try= on your 128 core system: # while kldload vmm ; do echo -n . ; kldunload vmm ; done If anybody can tell me how to debug at the hardware level using JTAG, I can= give it a try on my RockPro64 and see where the kernel is stuck. I have u= sed hardware level debugging tools, but they were always black boxes my emp= loyer bought with instructions included. > On Apr 14, 2024, at 04:50, tuexen@freebsd.org wrote: >=20 > Dear all, >=20 > using the sources for kernel/world of yesterday running > kldload vmm > on a 128 core Ampere system runs just fine: >=20 > CPU 0: ARM Neoverse-N1 r3p1 affinity: 18 0 0 > Cache Type =3D <64 byte D-cacheline,64 byte I-cacheline,= PIPT ICache,64 byte ERG,64 byte CWG,IDC> > Instruction Set Attributes 0 =3D <DP,RDM,Atomic,CRC32,SHA2,SHA1,AES+PMULL= > > Instruction Set Attributes 1 =3D <RCPC-8.3,DCPoP> > Instruction Set Attributes 2 =3D <> > Processor Features 0 =3D <CSV3,CSV2,RAS,GIC,AdvSIMD+HP,FP+HP,EL3,E= L2,EL1,EL0 32> > Processor Features 1 =3D <PSTATE.SSBS MSR> > Memory Model Features 0 =3D <TGran4,TGran64,TGran16,SNSMem,BigEnd,16b= it ASID,256TB PA> > Memory Model Features 1 =3D <XNX,PAN+ATS1E1,LO,HPD+TTPBHA,VH,16bit VM= ID,HAF+DS> > Memory Model Features 2 =3D <EVT-8.2,32bit CCIDX,48bit VA,UAO,CnP> > Debug Features 0 =3D <DoubleLock,SPE,2 CTX BKPTs,4 Watchpoints= ,6 Breakpoints,PMUv3p1,Debugv8p2> > Debug Features 1 =3D <> > Auxiliary Features 0 =3D <> > Auxiliary Features 1 =3D <> > AArch32 Instruction Set Attributes 5 =3D <RDM,CRC32,SHA2,SHA1,AES+VMULL,S= EVL> > AArch32 Media and VFP Features 0 =3D <FPRound,FPSqrt,FPDivide,DP VFPv3+v4= ,SP VFPv3+v4,AdvSIMD> > AArch32 Media and VFP Features 1 =3D <SIMDFMAC,FPHP Arith,SIMDHP Arith,SI= MDSP,SIMDInt,SIMDLS,FPDNaN,FPFtZ> >=20 > However, doing the same on a 32 core Ampere system results in > the system becoming unresponsive. No reaction on the console, > no message there, no response over the network. >=20 > CPU 0: APM eMAG 8180 r3p2 affinity: 0 0 > Cache Type =3D <64 byte D-cacheline,64 byte I-cacheline,PI= PT ICache,64 byte ERG,64 byte CWG> > Instruction Set Attributes 0 =3D <CRC32,SHA2,SHA1,AES+PMULL> > Instruction Set Attributes 1 =3D <> > Instruction Set Attributes 2 =3D <> > Processor Features 0 =3D <GIC,AdvSIMD,FP,EL3,EL2,EL1 32,EL0 32> > Processor Features 1 =3D <> > Memory Model Features 0 =3D <TGran4,TGran64,TGran16,SNSMem,BigEnd,16bit= ASID,4TB PA> > Memory Model Features 1 =3D <8bit VMID> > Trying to mount root from ufs:/dev/ada0p2 [rw]... > Memory Model Features 2 =3D <32bit CCIDX,48bit VA> > Debug Features 0 =3D <DoubleLock,2 CTX BKPTs,4 Watchpoints,6 Bre= akpoints,PMUv3,Debugv8> > Debug Features 1 =3D <> > Auxiliary Features 0 =3D <> > Auxiliary Features 1 =3D <> > AArch32 Instruction Set Attributes 5 =3D <CRC32,SHA2,SHA1,AES+VMULL,SEVL> > AArch32 Media and VFP Features 0 =3D <FPRound,FPSqrt,FPDivide,DP VFPv3+v4= ,SP VFPv3+v4,AdvSIMD> > AArch32 Media and VFP Features 1 =3D <SIMDFMAC,FPHP DP Conv,SIMDHP SP Con= v,SIMDSP,SIMDInt,SIMDLS,FPDNaN,FPFtZ> >=20 > Any idea, what is going wrong? >=20 > Best regards > Michael
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