On Tue, May 05, 2020 at 10:32:15PM -0400, Qian Cai wrote: > Today’s linux-next started to fail with this config, > > https://raw.githubusercontent.com/cailca/linux-mm/master/kcsan.config > > qemu-kvm-2.12.0-99.module+el8.2.0+5827+8c39933c.x86_64 > > I believe it was working yesterday. Before I bury myself bisecting it, does > anyone have any thought?
It reproduces for me as well with my vanilla config in a VM. I can debug and/or bisect, should be quite quick in a VM. VM is bailing on the EPT Violation at the reset vector, i.e. on the very first exit. Presumably KVM is incorrectly setting vmx->fail somewhere. > # /usr/libexec/qemu-kvm -name ubuntu-18.04-server-cloudimg -cpu host -smp 2 > -m 2G -hda ubuntu-18.04-server-cloudimg.qcow2 -cdrom > ubuntu-18.04-server-cloudimg.iso -nic user,hostfwd=tcp::2222-:22 -nographic > > KVM: entry failed, hardware error 0x0 > EAX=00000000 EBX=00000000 ECX=00000000 EDX=000306f2 > ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000 > EIP=0000fff0 EFL=00010002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0 > ES =0000 00000000 0000ffff 00009300 > CS =f000 ffff0000 0000ffff 00009b00 > SS =0000 00000000 0000ffff 00009300 > DS =0000 00000000 0000ffff 00009300 > FS =0000 00000000 0000ffff 00009300 > GS =0000 00000000 0000ffff 00009300 > LDT=0000 00000000 0000ffff 00008200 > TR =0000 00000000 0000ffff 00008b00 > GDT= 00000000 0000ffff > IDT= 00000000 0000ffff > CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000 > DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 > DR3=0000000000000000 > DR6=00000000ffff0ff0 DR7=0000000000000400 > EFER=0000000000000000 > > [28040.962363][T78789] *** Guest State *** > [28040.981990][T78789] CR0: actual=0x0000000000000030, > shadow=0x0000000060000010, gh_mask=fffffffffffffff7 > [28041.030248][T78789] CR4: actual=0x0000000000002040, > shadow=0x0000000000000000, gh_mask=ffffffffffffe871 > [28041.075900][T78789] CR3 = 0x0000000000000000 > [28041.096369][T78789] RSP = 0x0000000000000000 RIP = 0x000000000000fff0 > [28041.127519][T78789] RFLAGS=0x00010002 DR7 = 0x0000000000000400 > [28041.158730][T78789] Sysenter RSP=0000000000000000 > CS:RIP=0000:0000000000000000 > [28041.193409][T78789] CS: sel=0xf000, attr=0x0009b, limit=0x0000ffff, > base=0x00000000ffff0000 > [28041.234135][T78789] DS: sel=0x0000, attr=0x00093, limit=0x0000ffff, > base=0x0000000000000000 > [28041.274796][T78789] SS: sel=0x0000, attr=0x00093, limit=0x0000ffff, > base=0x0000000000000000 > [28041.315631][T78789] ES: sel=0x0000, attr=0x00093, limit=0x0000ffff, > base=0x0000000000000000 > [28041.357025][T78789] FS: sel=0x0000, attr=0x00093, limit=0x0000ffff, > base=0x0000000000000000 > [28041.397808][T78789] GS: sel=0x0000, attr=0x00093, limit=0x0000ffff, > base=0x0000000000000000 > [28041.438806][T78789] GDTR: limit=0x0000ffff, > base=0x0000000000000000 > [28041.479557][T78789] LDTR: sel=0x0000, attr=0x00082, limit=0x0000ffff, > base=0x0000000000000000 > [28041.522599][T78789] IDTR: limit=0x0000ffff, > base=0x0000000000000000 > [28041.564289][T78789] TR: sel=0x0000, attr=0x0008b, limit=0x0000ffff, > base=0x0000000000000000 > [28041.604705][T78789] EFER = 0x0000000000000000 PAT = 0x0007040600070406 > [28041.638146][T78789] DebugCtl = 0x0000000000000000 DebugExceptions = > 0x0000000000000000 > [28041.676235][T78789] Interruptibility = 00000000 ActivityState = 00000000 > [28041.709019][T78789] InterruptStatus = 0000 > [28041.728432][T78789] *** Host State *** > [28041.746774][T78789] RIP = 0xffffffffc05ab620 RSP = 0xffffb24ec6c9fb08 > [28041.777531][T78789] CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 > [28041.811313][T78789] FSBase=00007f697ffff700 GSBase=ffff8d799f980000 > TRBase=fffffe00001e0000 > [28041.851017][T78789] GDTBase=fffffe00001de000 IDTBase=fffffe0000000000 > [28041.881294][T78789] CR0=0000000080050033 CR3=00000008802c8003 > CR4=00000000001626e0 > [28041.917895][T78789] Sysenter RSP=0000000000000000 > CS:RIP=0000:0000000000000000 > [28041.953737][T78789] EFER = 0x0000000000000d01 PAT = 0x0007040600070406 > [28041.986043][T78789] *** Control State *** > [28042.006510][T78789] PinBased=000000ff CPUBased=b5a06dfa > SecondaryExec=000037eb > [28042.043823][T78789] EntryControls=0000d1ff ExitControls=002befff > [28042.074416][T78789] ExceptionBitmap=00060042 PFECmask=00000000 > PFECmatch=00000000 > [28042.110314][T78789] VMEntry: intr_info=00000000 errcode=00000000 > ilen=00000000 > [28042.144970][T78789] VMExit: intr_info=00000000 errcode=00000000 > ilen=00000003 > [28042.178829][T78789] reason=00000030 qualification=0000000000000184 > [28042.211619][T78789] IDTVectoring: info=00000000 errcode=00000000 > [28042.240511][T78789] TSC Offset = 0xffffbe0284927b21 > [28042.264284][T78789] SVI|RVI = 00|00 TPR Threshold = 0x00 > [28042.289414][T78789] APIC-access addr = 0x0000000e5dfc0000 virt-APIC addr = > 0x0000000d2e76c000 > [28042.330409][T78789] PostedIntrVec = 0xf2 > [28042.349513][T78789] EPT pointer = 0x000000105a27005e > [28042.372955][T78789] PLE Gap=00000080 Window=00001000 > [28042.396744][T78789] Virtual processor ID = 0x0001 > > # lscpu > Architecture: x86_64 > CPU op-mode(s): 32-bit, 64-bit > Byte Order: Little Endian > CPU(s): 48 > On-line CPU(s) list: 0-47 > Thread(s) per core: 1 > Core(s) per socket: 12 > Socket(s): 4 > NUMA node(s): 4 > Vendor ID: GenuineIntel > CPU family: 6 > Model: 63 > Model name: Intel(R) Xeon(R) CPU E5-4650 v3 @ 2.10GHz > Stepping: 2 > CPU MHz: 1400.623 > BogoMIPS: 4195.13 > Virtualization: VT-x > L1d cache: 32K > L1i cache: 32K > L2 cache: 256K > L3 cache: 30720K > NUMA node0 CPU(s): 0-5,24-29 > NUMA node1 CPU(s): 6-11,30-35 > NUMA node2 CPU(s): 12-17,36-41 > NUMA node3 CPU(s): 18-23,42-47 > Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca > cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx > pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology > nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est > tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt > tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm cpuid_fault epb > invpcid_single pti intel_ppin ssbd ibrs ibpb stibp tpr_shadow vnmi > flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms > invpcid cqm xsaveopt cqm_llc cqm_occup_llc dtherm arat pln pts flush_l1d
