I just hit the endless "scsi_xfer pool exhausted!" stream that others
reported over the years. I don't believe people previously found a
satisfactory resolution to the problem. The machine in question is a Google
Compute Engine VM (I found reports of vmware VM with this symptom).
One thing I observed is syz-bot abuses the machine pretty badly. It runs a
ton of golang compilations in parallel and they exhaust the 24G of RAM
which makes the machine very slow. jca@ hypothesized that when a system
runs with elevated memory pressure it is likely to hit this problem. So,
I'll increase the amount of RAM for the VM to match what linux bot has.
I'll also pick up the most recent snapshot, while I'm here.
Now, is there any value in trying to follow scxspl pool utilization while
the system is running? Do we have a more pointed tool than systat for that?
Right now systat reports
scxspl 200 736552 0 2 352 348 4 14 0 8 3
The machine just finished rebuilding syzkaller and churning through a
kernel build.
Thanks
Greg
OpenBSD 6.8-beta (GENERIC.MP) #54: Mon Aug 31 18:15:42 MDT 2020
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 25753014272 (24559MB)
avail mem = 24957480960 (23801MB)
random: good seed from bootblocks
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xbffffc90 (22 entries)
bios0: vendor Google version "Google" date 01/01/2011
bios0: Google Google Compute Engine
acpi0 at bios0: ACPI 2.0
acpi0: sleep states S3 S4 S5
acpi0: tables DSDT FACP SRAT APIC SSDT WAET
acpi0: wakeup devices
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Xeon(R) CPU @ 2.30GHz, 2300.33 MHz, 06-3f-00
cpu0:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SS,HTT,SSE3,PCLMUL,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,RDRAND,HV,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,SSBD,ARAT,XSAVEOPT,MELTDOWN
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 990MHz
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Xeon(R) CPU @ 2.30GHz, 2276.87 MHz, 06-3f-00
cpu1:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SS,HTT,SSE3,PCLMUL,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,RDRAND,HV,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,SSBD,ARAT,XSAVEOPT,MELTDOWN
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: disabling user TSC (skew=-485)
cpu1: smt 0, core 1, package 0
cpu2 at mainbus0: apid 4 (application processor)
cpu2: Intel(R) Xeon(R) CPU @ 2.30GHz, 2276.89 MHz, 06-3f-00
cpu2:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SS,HTT,SSE3,PCLMUL,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,RDRAND,HV,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,SSBD,ARAT,XSAVEOPT,MELTDOWN
cpu2: 256KB 64b/line 8-way L2 cache
cpu2: smt 0, core 2, package 0
cpu3 at mainbus0: apid 6 (application processor)
cpu3: Intel(R) Xeon(R) CPU @ 2.30GHz, 2276.90 MHz, 06-3f-00
cpu3:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SS,HTT,SSE3,PCLMUL,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,RDRAND,HV,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,SSBD,ARAT,XSAVEOPT,MELTDOWN
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: smt 0, core 3, package 0
cpu4 at mainbus0: apid 1 (application processor)
cpu4: Intel(R) Xeon(R) CPU @ 2.30GHz, 2276.91 MHz, 06-3f-00
cpu4:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SS,HTT,SSE3,PCLMUL,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,RDRAND,HV,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,SSBD,ARAT,XSAVEOPT,MELTDOWN
cpu4: 256KB 64b/line 8-way L2 cache
cpu4: smt 1, core 0, package 0
cpu5 at mainbus0: apid 3 (application processor)
cpu5: Intel(R) Xeon(R) CPU @ 2.30GHz, 2276.89 MHz, 06-3f-00
cpu5:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SS,HTT,SSE3,PCLMUL,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,RDRAND,HV,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,SSBD,ARAT,XSAVEOPT,MELTDOWN
cpu5: 256KB 64b/line 8-way L2 cache
cpu5: smt 1, core 1, package 0
cpu6 at mainbus0: apid 5 (application processor)
cpu6: Intel(R) Xeon(R) CPU @ 2.30GHz, 2276.89 MHz, 06-3f-00
cpu6:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SS,HTT,SSE3,PCLMUL,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,RDRAND,HV,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,SSBD,ARAT,XSAVEOPT,MELTDOWN
cpu6: 256KB 64b/line 8-way L2 cache
cpu6: smt 1, core 2, package 0
cpu7 at mainbus0: apid 7 (application processor)
cpu7: Intel(R) Xeon(R) CPU @ 2.30GHz, 2276.89 MHz, 06-3f-00
cpu7:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SS,HTT,SSE3,PCLMUL,SSSE3,FMA3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,RDRAND,HV,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,ITSC,FSGSBASE,TSC_ADJUST,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MD_CLEAR,IBRS,IBPB,STIBP,SSBD,ARAT,XSAVEOPT,MELTDOWN
cpu7: 256KB 64b/line 8-way L2 cache
cpu7: smt 1, core 3, package 0
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins
acpiprt0 at acpi0: bus 0 (PCI0)
"ACPI0006" at acpi0 not configured
acpipci0 at acpi0 PCI0
extent `acpipci0 pcibus' (0x0 - 0xff), flags=0
extent `pciio' (0x0 - 0xffffffff), flags=0
0x10000 - 0xffffffff
extent `pcimem' (0x0 - 0xffffffffffffffff), flags=0
0x0 - 0xbfffffff
0xfffbc000 - 0xffffffff
0x40000000000 - 0xffffffffffffffff
acpicmos0 at acpi0
"QEMU0001" at acpi0 not configured
acpicpu0 at acpi0: C1(@1 halt!)
acpicpu1 at acpi0: C1(@1 halt!)
acpicpu2 at acpi0: C1(@1 halt!)
acpicpu3 at acpi0: C1(@1 halt!)
acpicpu4 at acpi0: C1(@1 halt!)
acpicpu5 at acpi0: C1(@1 halt!)
acpicpu6 at acpi0: C1(@1 halt!)
acpicpu7 at acpi0: C1(@1 halt!)
cpu0: using VERW MDS workaround
pvbus0 at mainbus0: KVM
pvclock0 at pvbus0
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 82441FX" rev 0x02
pcib0 at pci0 dev 1 function 0 "Intel 82371AB PIIX4 ISA" rev 0x03
piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x03: SMBus
disabled
virtio0 at pci0 dev 3 function 0 "Qumranet Virtio SCSI" rev 0x00
vioscsi0 at virtio0: qsize 8192
scsibus1 at vioscsi0: 253 targets
sd0 at scsibus1 targ 1 lun 0: <Google, PersistentDisk, 1>
serial.Google_PersistentDisk_
sd0: 10240MB, 512 bytes/sector, 20971520 sectors, thin
sd1 at scsibus1 targ 2 lun 0: <Google, PersistentDisk, 1>
serial.Google_PersistentDisk_
sd1: 1024000MB, 512 bytes/sector, 2097152000 sectors, thin
virtio0: msix shared
virtio1 at pci0 dev 4 function 0 "Qumranet Virtio Network" rev 0x00
vio0 at virtio1: address 42:01:0a:80:0f:eb
virtio1: msix per-VQ
virtio2 at pci0 dev 5 function 0 "Qumranet Virtio Memory Balloon" rev 0x00
viomb0 at virtio2
virtio2: apic 0 int 10
virtio3 at pci0 dev 6 function 0 "Qumranet Virtio RNG" rev 0x00
viornd0 at virtio3
virtio3: msix shared
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com0: console
com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
com2 at isa0 port 0x3e8/8 irq 5: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0 mux 1
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (cbe475edb8f8863e.a) swap on sd0b dump on sd0b
WARNING: / was not properly unmounted
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