>Synopsis: Witnesss lock order reversal in radeondrm
>Category: kernel
>Environment:
System : OpenBSD 7.1
Details : OpenBSD 7.1-current (CUSTOM.MP) #14: Wed Apr 27 13:22:39
EDT 2022
d...@minmin.sisu.home:/usr/src/sys/arch/amd64/compile/CUSTOM.MP
Architecture: OpenBSD.amd64
Machine : amd64
>Description:
Noticed this on a fresh kernel I built while hacking on some vmm/vmd
stuff. Probably related to the MP_LOCKDEBUG spinout I reported
previously and since bumped the spinout counter to INT_MAX.
The following was in my kernel buffer after rebooting and logging
into my box:
witness: lock order reversal:
1st 0xfd91bffda1d0 uobjlk (>vmobjlock)
2nd 0x80430b78 mclk (>pm.mclk_lock)
lock order data w2 -> w1 missing
lock order ">vmobjlock"(rwlock) -> ">pm.mclk_lock"(rwlock) first
seen at:
#0 rw_enter_read+0x38
#1 radeon_gem_fault+0x4e
#2 uvm_fault+0x179
#3 upageflttrap+0x62
#4 usertrap+0x129
#5 recall_trap+0x8
>How-To-Repeat:
My kernel config:
include "arch/amd64/conf/GENERIC"
#option VMM_DEBUG
option MULTIPROCESSOR
option MP_LOCKDEBUG
option WITNESS
cpu*at mainbus?
>Fix:
TBD
-dv
dmesg:
OpenBSD 7.1-current (CUSTOM.MP) #14: Wed Apr 27 13:22:39 EDT 2022
d...@minmin.sisu.home:/usr/src/sys/arch/amd64/compile/CUSTOM.MP
real mem = 85769121792 (81795MB)
avail mem = 82520170496 (78697MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xec0f0 (105 entries)
bios0: vendor Dell Inc. version "A32" date 09/25/2019
bios0: Dell Inc. Precision Tower 7810
acpi0 at bios0: ACPI 5.0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP APIC FPDT FIDT MCFG UEFI HPET MSCT SLIT SRAT SRAT WDDT
SSDT NITR SLIC MSDM DMAR ASF!
acpi0: wakeup devices IP2P(S3) RP01(S4) RP02(S4) RP03(S4) RP04(S4) RP06(S4)
RP07(S4) RP08(S4) BR1A(S4) BR1B(S4) BR2A(S4) BR2B(S4) BR2C(S4) BR2D(S4)
BR3A(S4) BR3B(S4) [...]
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee0: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Xeon(R) CPU E5-2643 v3 @ 3.40GHz, 3392.63 MHz, 06-3f-02
cpu0:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,DCA,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,PQM,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu0: mwait min=64, max=64, C-substates=0.2.1.2, IBE
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Xeon(R) CPU E5-2643 v3 @ 3.40GHz, 3392.16 MHz, 06-3f-02
cpu1:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,DCA,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,PQM,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: disabling user TSC (skew=9173028)
cpu1: smt 0, core 1, package 0
cpu2 at mainbus0: apid 4 (application processor)
cpu2: Intel(R) Xeon(R) CPU E5-2643 v3 @ 3.40GHz, 3392.16 MHz, 06-3f-02
cpu2:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,DCA,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,PQM,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu2: 256KB 64b/line 8-way L2 cache
cpu2: disabling user TSC (skew=9880086)
cpu2: smt 0, core 2, package 0
cpu3 at mainbus0: apid 6 (application processor)
cpu3: Intel(R) Xeon(R) CPU E5-2643 v3 @ 3.40GHz, 3392.16 MHz, 06-3f-02
cpu3:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,DCA,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,PQM,MD_CLEAR,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: disabling user TSC (skew=8299192)
cpu3: smt 0, core 3, package 0
cpu4 at mainbus0: apid 8 (application processor)
cpu4: Intel(R) Xeon(R) CPU E5-2643 v3 @
