Re: panic: pmap_tlb_pendcount > 0 failed

To: current-users%NetBSD.org@localhost, campbell+netbsd%mumble.net@localhost
Subject: Re: panic: pmap_tlb_pendcount > 0 failed
From: Thomas Klausner <wiz%NetBSD.org@localhost>
Date: Thu, 28 Mar 2013 10:29:31 +0100

On Thu, Mar 28, 2013 at 09:50:33AM +0100, Thomas Klausner wrote:
> On Thu, Mar 28, 2013 at 09:00:45AM +0100, Thomas Klausner wrote:
> > On Thu, Mar 28, 2013 at 12:29:40AM +0100, Thomas Klausner wrote:
> > > Hi!
> > > 
> > > I've just run a GENERIC-6.99.18/amd64 kernel from today on a newly
> > > acquired machine, and see:
> > > 
> > > ...
> > > acpicpu11 at cpu11: ACPI CPU
> > > panic: kernel diagnostic assertion "pmap_tlb_pendcount > 0" failed: file 
> > > "../../../../arch/x86/x86/pmap_tlb.c", line 451
> > > fatal breakpoint trap in supervisor mode
> > > trap type 1 code 0 rip ffffffff802546ed cs 8 rflags 46 cr2 0 ilevel 0 rsp 
> > > fffffe813a6369e0
> > > curlwp 0xfffffe887556bb20 pid 0.71 lowest kstrack 0xfffffe813a633000
> > > Stopped in pid 0.71 (system) at netbsd:breakpoint+0x5: leave
> > > db{10}> bt
> > > breakpoint() at netbsd:breakpoint+0x5
> > > vpanic() at netbsd:vpanic+0x136
> > > kern_assert() at netbsd:kern_assert+0x48
> > > pmap_tlb_intr() at netbsd:pmap_tlb_intr+0xf4
> > > DDB lost frame for netbsd:Xinter_lapic_tlb+0x98, trying 0xfffffe813636aa0
> > > Xintr_lapic_tlb() at netbsd:Xinter_lapic_tlb+0x98
> > > --- interrupt ---
> > > 246:
> > > db{10}>
> > > 
> > > dmesg is too long to copy by hand, but available on the db prompt.
> > > It's a Supermicro X9SRi with a Xeon E5-1650@3.20GHz.
> > 
> > PR 47437 by Taylor R Campbell might be related, he writes:
> > 
> >    Sometimes when I boot a many-core machine, during autoconf I
> >    get a panic after the ACPI CPU devices are configured.  I've
> >    seen the panic several times; last night I caught it on the
> >    serial console for the first time with ddb and grabbed a stack
> >    trace.  I believe it always happens after all the acpicpuN
> >    devices are attached, but I'm not sure.
> > 
> > so it's the same place in the boot process; but his panic is
> > 
> > panic: kernel diagnostic assertion "pmap_tlb_pendcount < ncpu" failed: file 
> > "/home/riastradh/netbsd/current/src/sys/arch/x86/x86/pmap_tlb.c", line 434
> 
> I've looked at my panic a bit more:
> 
> pmap_tlb_pendcount is a static volatile u_int, but the kassert triggers:
>         KASSERT(pmap_tlb_pendcount > 0);
> So I assume it must be zero at that time.
> 
> The kassert is in sys/arch/x86/x86/pmap_tlb.c in the function
> pmap_tlb_intr(). I have found only one caller for it,
> sys/arch/i386/i386/vector.S:
> 
> /*
>  * TLB shootdown handler.
>  */
> IDTVEC(intr_lapic_tlb)
>         pushl   $0
>         pushl   $T_ASTFLT
>         INTRENTRY
>         movl    $0, _C_LABEL(local_apic)+LAPIC_EOI
>         call    _C_LABEL(pmap_tlb_intr)
>         INTRFASTEXIT
> IDTVEC_END(intr_lapic_tlb)
> 
> On the other hand, there is only one place where it is increased, in
> sys/arch/x86/x86/pmap_tlb.c again:
> ...
>         local = kcpuset_isset(target, cid) ? 1 : 0;
>         rcpucount = kcpuset_countset(target) - local;
> #ifdef MULTIPROCESSOR
>         if (rcpucount) {
> ...
>                 while (atomic_cas_uint(&pmap_tlb_pendcount, 0, rcpucount)) {
>                         splx(s);
>                         count = SPINLOCK_BACKOFF_MIN;
>                         while (pmap_tlb_pendcount) {
>                                 KASSERT(pmap_tlb_pendcount < ncpu);
>                                 SPINLOCK_BACKOFF(count);
>                         }
>                         s = splvm();
>                         /* An interrupt might have done it for us. */
>                         if (tp->tp_count == 0) {
>                                 splx(s);
>                                 return;
>                         }
>                 }
> ...
> 
> 
> I don't know enough about this to dig further here.

One more datapoint: It only happened in one out of four boots (the
first), so it's racy.

The dmesg of a successful boot is attached. Lots of unrecognized stuff, and one 
weird line
acpi0: X/RSDT: OemId <M^?M^?M^?M^?M^?M^?,M^?M^?M^?M^?M^?M^?M^?M^?,00000001>, 
AslId <AMI ,00010013>

 Thomas

Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 6.99.18 (GENERIC) #0: Wed Mar 27 23:40:09 CET 2013
        wiz%yt.nih.at@localhost:/usr/src/sys/arch/amd64/compile/GENERIC
total memory = 32735 MB
avail memory = 31770 MB
timecounter: Timecounters tick every 10.000 msec
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
Supermicro X9SRE/X9SRE-3F/X9SRi/X9SRi-3F (0123456789)
mainbus0 (root)
cpu0 at mainbus0 apid 0: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz, id 0x206d7
cpu1 at mainbus0 apid 2: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz, id 0x206d7
cpu2 at mainbus0 apid 4: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz, id 0x206d7
cpu3 at mainbus0 apid 6: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz, id 0x206d7
cpu4 at mainbus0 apid 8: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz, id 0x206d7
cpu5 at mainbus0 apid 10: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz, id 0x206d7
cpu6 at mainbus0 apid 1: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz, id 0x206d7
cpu7 at mainbus0 apid 3: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz, id 0x206d7
cpu8 at mainbus0 apid 5: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz, id 0x206d7
cpu9 at mainbus0 apid 7: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz, id 0x206d7
cpu10 at mainbus0 apid 9: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz, id 0x206d7
cpu11 at mainbus0 apid 11: Intel(R) Xeon(R) CPU E5-1650 0 @ 3.20GHz, id 0x206d7
ioapic0 at mainbus0 apid 0: pa 0xfec00000, version 20, 24 pins
ioapic1 at mainbus0 apid 2: pa 0xfec01000, version 20, 24 pins
acpi0 at mainbus0: Intel ACPICA 20110623
acpi0: X/RSDT: OemId <M^?M^?M^?M^?M^?M^?,M^?M^?M^?M^?M^?M^?M^?M^?,00000001>, 
AslId <AMI ,00010013>
acpi0: SCI interrupting at int 9
timecounter: Timecounter "ACPI-Fast" frequency 3579545 Hz quality 1000
hpet0 at acpi0: high precision event timer (mem 0xfed00000-0xfed00400)
timecounter: Timecounter "hpet0" frequency 14318180 Hz quality 2000
IOH (PNP0C01) at acpi0 not configured
VTDR (PNP0C02) at acpi0 not configured
attimer1 at acpi0 (TMR, PNP0100): io 0x40-0x43 irq 0
pcppi1 at acpi0 (SPKR, PNP0800): io 0x61
midi0 at pcppi1: PC speaker
sysbeep0 at pcppi1
RMSC (PNP0C02) at acpi0 not configured
SIO1 (PNP0C02) at acpi0 not configured
pckbc1 at acpi0 (PS2K, PNP0303) (kbd port): io 0x60,0x64 irq 1
pckbc2 at acpi0 (PS2M, PNP0F03) (aux port): irq 12
UAR1 (PNP0501) at acpi0 not configured
UAR2 (PNP0501) at acpi0 not configured
SIO2 (PNP0C02) at acpi0 not configured
UAR3 (PNP0501) at acpi0 not configured
SPMI (IPI0001) at acpi0 not configured
PCH (PNP0C01) at acpi0 not configured
CWDT (INT3F0D) at acpi0 not configured
acpibut0 at acpi0 (PWRB, PNP0C0C-170): ACPI Power Button
RMEM (PNP0C01) at acpi0 not configured
acpiwmi0 at acpi0 (SRIO, PNP0C14-0): ACPI WMI Interface
acpiwmibus at acpiwmi0 not configured
SCK0 (ACPI0004) at acpi0 not configured
OMSC (PNP0C02) at acpi0 not configured
attimer1: attached to pcppi1
pckbd0 at pckbc1 (kbd slot)
pckbc1: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard
ipmi0 at mainbus0
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
pchb0 at pci0 dev 0 function 0: vendor 0x8086 product 0x3c00 (rev. 0x07)
ppb0 at pci0 dev 1 function 0: vendor 0x8086 product 0x3c02 (rev. 0x07)
ppb0: PCI Express 2.0 <Root Port of PCI-E Root Complex> x4 @ 2.5Gb/s
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled, rd/line, wr/inv ok
ppb1 at pci0 dev 2 function 0: vendor 0x8086 product 0x3c04 (rev. 0x07)
ppb1: PCI Express 2.0 <Root Port of PCI-E Root Complex> x16 @ 8.0Gb/s
pci2 at ppb1 bus 2
pci2: i/o space, memory space enabled, rd/line, wr/inv ok
ppb2 at pci0 dev 3 function 0: vendor 0x8086 product 0x3c08 (rev. 0x07)
ppb2: PCI Express 2.0 <Root Port of PCI-E Root Complex> x8 @ 8.0Gb/s
ppb2: link is x4 @ 5.0Gb/s
pci3 at ppb2 bus 3
pci3: i/o space, memory space enabled, rd/line, wr/inv ok
wm0 at pci3 dev 0 function 0: I350 Gigabit Network Connection (rev. 0x01)
wm0: interrupting at ioapic1 pin 16
wm0: PCI-Express bus
wm0: 256 word (8 address bits) SPI EEPROM
wm0: Ethernet address 00:25:90:a7:ac:30
ukphy0 at wm0 phy 1: OUI 0x00aa00, model 0x003b, rev. 1
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 
1000baseT-FDX, auto
wm1 at pci3 dev 0 function 1: I350 Gigabit Network Connection (rev. 0x01)
wm1: interrupting at ioapic1 pin 20
wm1: PCI-Express bus
wm1: 256 word (8 address bits) SPI EEPROM
wm1: Ethernet address 00:25:90:a7:ac:31
ukphy1 at wm1 phy 1: OUI 0x00aa00, model 0x003b, rev. 1
ukphy1: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 
1000baseT-FDX, auto
ppb3 at pci0 dev 3 function 2: vendor 0x8086 product 0x3c0a (rev. 0x07)
ppb3: PCI Express 2.0 <Root Port of PCI-E Root Complex> x8 @ 8.0Gb/s
pci4 at ppb3 bus 5
pci4: i/o space, memory space enabled, rd/line, wr/inv ok
vendor 0x8086 product 0x3c20 (miscellaneous system, revision 0x07) at pci0 dev 
4 function 0 not configured
vendor 0x8086 product 0x3c21 (miscellaneous system, revision 0x07) at pci0 dev 
4 function 1 not configured
vendor 0x8086 product 0x3c22 (miscellaneous system, revision 0x07) at pci0 dev 
4 function 2 not configured
vendor 0x8086 product 0x3c23 (miscellaneous system, revision 0x07) at pci0 dev 
4 function 3 not configured
vendor 0x8086 product 0x3c24 (miscellaneous system, revision 0x07) at pci0 dev 
4 function 4 not configured
vendor 0x8086 product 0x3c25 (miscellaneous system, revision 0x07) at pci0 dev 
4 function 5 not configured
vendor 0x8086 product 0x3c26 (miscellaneous system, revision 0x07) at pci0 dev 
4 function 6 not configured
vendor 0x8086 product 0x3c27 (miscellaneous system, revision 0x07) at pci0 dev 
4 function 7 not configured
vendor 0x8086 product 0x3c28 (miscellaneous system, revision 0x07) at pci0 dev 
5 function 0 not configured
vendor 0x8086 product 0x3c2a (miscellaneous system, revision 0x07) at pci0 dev 
5 function 2 not configured
vendor 0x8086 product 0x3c2c (interrupt system, interface 0x20, revision 0x07) 
at pci0 dev 5 function 4 not configured
ppb4 at pci0 dev 17 function 0: vendor 0x8086 product 0x1d3e (rev. 0x06)
ppb4: PCI Express 2.0 <Root Port of PCI-E Root Complex> x1 @ 2.5Gb/s
pci5 at ppb4 bus 6
pci5: i/o space, memory space enabled, rd/line, wr/inv ok
vendor 0x8086 product 0x1d6b (SAS mass storage, revision 0x06) at pci5 dev 0 
function 0 not configured
vendor 0x8086 product 0x1d3a (miscellaneous communications, revision 0x05) at 
pci0 dev 22 function 0 not configured
vendor 0x8086 product 0x1d3b (miscellaneous communications, revision 0x05) at 
pci0 dev 22 function 1 not configured
ehci0 at pci0 dev 26 function 0: vendor 0x8086 product 0x1d2d (rev. 0x06)
ehci0: interrupting at ioapic0 pin 16
ehci0: BIOS has given up ownership
ehci0: EHCI version 1.0
usb0 at ehci0: USB revision 2.0
ehci1 at pci0 dev 29 function 0: vendor 0x8086 product 0x1d26 (rev. 0x06)
ehci1: interrupting at ioapic0 pin 23
ehci1: BIOS has given up ownership
ehci1: EHCI version 1.0
usb1 at ehci1: USB revision 2.0
ppb5 at pci0 dev 30 function 0: vendor 0x8086 product 0x244e (rev. 0xa6)
pci6 at ppb5 bus 7
pci6: i/o space, memory space enabled
vga0 at pci6 dev 4 function 0: vendor 0x102b product 0x0532 (rev. 0x0a)
wsdisplay0 at vga0 kbdmux 1: console (80x25, vt100 emulation), using wskbd0
wsmux1: connecting to wsdisplay0
drm at vga0 not configured
ichlpcib0 at pci0 dev 31 function 0: vendor 0x8086 product 0x1d41 (rev. 0x06)
timecounter: Timecounter "ichlpcib0" frequency 3579545 Hz quality 1000
ichlpcib0: 24-bit timer
ichlpcib0: TCO timer reboot disabled by hardware; hope SMBIOS properly handles 
it.
ichlpcib0: TCO (watchdog) timer configured.
ahcisata0 at pci0 dev 31 function 2: vendor 0x8086 product 0x1d02 (rev. 0x06)
ahcisata0: interrupting at ioapic0 pin 18
ahcisata0: 64-bit DMA
ahcisata0: AHCI revision 1.30, 6 ports, 32 slots, CAP 
0xe730ff45<EMS,PSC,SSC,PMD,ISS=0x3=Gen3,SCLO,SAL,SALP,SSNTF,SNCQ,S64A>
atabus0 at ahcisata0 channel 0
atabus1 at ahcisata0 channel 1
atabus2 at ahcisata0 channel 2
atabus3 at ahcisata0 channel 3
atabus4 at ahcisata0 channel 4
atabus5 at ahcisata0 channel 5
ichsmb0 at pci0 dev 31 function 3: vendor 0x8086 product 0x1d22 (rev. 0x06)
ichsmb0: interrupting at ioapic0 pin 18
iic0 at ichsmb0: I2C bus
vendor 0x8086 product 0x1d24 (miscellaneous DASP, revision 0x06) at pci0 dev 31 
function 6 not configured
isa0 at ichlpcib0
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
pci7 at mainbus0 bus 255
pci7: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
vendor 0x8086 product 0x3c80 (miscellaneous system, revision 0x07) at pci7 dev 
8 function 0 not configured
vendor 0x8086 product 0x3c83 (miscellaneous system, revision 0x07) at pci7 dev 
8 function 3 not configured
vendor 0x8086 product 0x3c84 (miscellaneous system, revision 0x07) at pci7 dev 
8 function 4 not configured
vendor 0x8086 product 0x3c90 (miscellaneous system, revision 0x07) at pci7 dev 
9 function 0 not configured
vendor 0x8086 product 0x3c93 (miscellaneous system, revision 0x07) at pci7 dev 
9 function 3 not configured
vendor 0x8086 product 0x3c94 (miscellaneous system, revision 0x07) at pci7 dev 
9 function 4 not configured
vendor 0x8086 product 0x3cc0 (miscellaneous system, revision 0x07) at pci7 dev 
10 function 0 not configured
vendor 0x8086 product 0x3cc1 (miscellaneous system, revision 0x07) at pci7 dev 
10 function 1 not configured
vendor 0x8086 product 0x3cc2 (miscellaneous system, revision 0x07) at pci7 dev 
10 function 2 not configured
vendor 0x8086 product 0x3cd0 (miscellaneous system, revision 0x07) at pci7 dev 
10 function 3 not configured
vendor 0x8086 product 0x3ce0 (miscellaneous system, revision 0x07) at pci7 dev 
11 function 0 not configured
vendor 0x8086 product 0x3ce3 (miscellaneous system, revision 0x07) at pci7 dev 
11 function 3 not configured
vendor 0x8086 product 0x3ce8 (miscellaneous system, revision 0x07) at pci7 dev 
12 function 0 not configured
vendor 0x8086 product 0x3ce8 (miscellaneous system, revision 0x07) at pci7 dev 
12 function 1 not configured
vendor 0x8086 product 0x3ce8 (miscellaneous system, revision 0x07) at pci7 dev 
12 function 2 not configured
vendor 0x8086 product 0x3cf4 (miscellaneous system, revision 0x07) at pci7 dev 
12 function 6 not configured
vendor 0x8086 product 0x3cf6 (miscellaneous system, revision 0x07) at pci7 dev 
12 function 7 not configured
vendor 0x8086 product 0x3ce8 (miscellaneous system, revision 0x07) at pci7 dev 
13 function 0 not configured
vendor 0x8086 product 0x3ce8 (miscellaneous system, revision 0x07) at pci7 dev 
13 function 1 not configured
vendor 0x8086 product 0x3ce8 (miscellaneous system, revision 0x07) at pci7 dev 
13 function 2 not configured
vendor 0x8086 product 0x3cf5 (miscellaneous system, revision 0x07) at pci7 dev 
13 function 6 not configured
vendor 0x8086 product 0x3ca0 (miscellaneous system, revision 0x07) at pci7 dev 
14 function 0 not configured
vendor 0x8086 product 0x3c46 (Time and Frequency DASP, revision 0x07) at pci7 
dev 14 function 1 not configured
vendor 0x8086 product 0x3ca8 (miscellaneous system, revision 0x07) at pci7 dev 
15 function 0 not configured
vendor 0x8086 product 0x3c71 (miscellaneous system, revision 0x07) at pci7 dev 
15 function 1 not configured
vendor 0x8086 product 0x3caa (miscellaneous system, revision 0x07) at pci7 dev 
15 function 2 not configured
vendor 0x8086 product 0x3cab (miscellaneous system, revision 0x07) at pci7 dev 
15 function 3 not configured
vendor 0x8086 product 0x3cac (miscellaneous system, revision 0x07) at pci7 dev 
15 function 4 not configured
vendor 0x8086 product 0x3cad (miscellaneous system, revision 0x07) at pci7 dev 
15 function 5 not configured
vendor 0x8086 product 0x3cae (miscellaneous system, revision 0x07) at pci7 dev 
15 function 6 not configured
vendor 0x8086 product 0x3cb0 (miscellaneous system, revision 0x07) at pci7 dev 
16 function 0 not configured
vendor 0x8086 product 0x3cb1 (miscellaneous system, revision 0x07) at pci7 dev 
16 function 1 not configured
vendor 0x8086 product 0x3cb2 (miscellaneous system, revision 0x07) at pci7 dev 
16 function 2 not configured
vendor 0x8086 product 0x3cb3 (miscellaneous system, revision 0x07) at pci7 dev 
16 function 3 not configured
vendor 0x8086 product 0x3cb4 (miscellaneous system, revision 0x07) at pci7 dev 
16 function 4 not configured
vendor 0x8086 product 0x3cb5 (miscellaneous system, revision 0x07) at pci7 dev 
16 function 5 not configured
vendor 0x8086 product 0x3cb6 (miscellaneous system, revision 0x07) at pci7 dev 
16 function 6 not configured
vendor 0x8086 product 0x3cb7 (miscellaneous system, revision 0x07) at pci7 dev 
16 function 7 not configured
vendor 0x8086 product 0x3cb8 (miscellaneous system, revision 0x07) at pci7 dev 
17 function 0 not configured
vendor 0x8086 product 0x3ce4 (miscellaneous system, revision 0x07) at pci7 dev 
19 function 0 not configured
vendor 0x8086 product 0x3c43 (Time and Frequency DASP, revision 0x07) at pci7 
dev 19 function 1 not configured
vendor 0x8086 product 0x3ce6 (Time and Frequency DASP, revision 0x07) at pci7 
dev 19 function 4 not configured
vendor 0x8086 product 0x3c44 (Time and Frequency DASP, revision 0x07) at pci7 
dev 19 function 5 not configured
vendor 0x8086 product 0x3c45 (miscellaneous system, revision 0x07) at pci7 dev 
19 function 6 not configured
acpicpu0 at cpu0: ACPI CPU
acpicpu0: C1: FFH, lat   3 us, pow  1000 mW
acpicpu0: C2: FFH, lat  93 us, pow   350 mW
acpicpu0: C3: FFH, lat  93 us, pow   200 mW, bus master check
acpicpu0: P0: FFH, lat  10 us, pow 130000 mW, 3201 MHz, turbo boost
acpicpu0: P1: FFH, lat  10 us, pow 130000 mW, 3200 MHz
acpicpu0: P2: FFH, lat  10 us, pow 118159 mW, 3000 MHz
acpicpu0: P3: FFH, lat  10 us, pow 113032 mW, 2900 MHz
acpicpu0: P4: FFH, lat  10 us, pow 108001 mW, 2800 MHz
acpicpu0: P5: FFH, lat  10 us, pow 98240 mW, 2600 MHz
acpicpu0: P6: FFH, lat  10 us, pow 93489 mW, 2500 MHz
acpicpu0: P7: FFH, lat  10 us, pow 83090 mW, 2300 MHz
acpicpu0: P8: FFH, lat  10 us, pow 78626 mW, 2200 MHz
acpicpu0: P9: FFH, lat  10 us, pow 74267 mW, 2100 MHz
acpicpu0: P10: FFH, lat  10 us, pow 65782 mW, 1900 MHz
acpicpu0: P11: FFH, lat  10 us, pow 61671 mW, 1800 MHz
acpicpu0: P12: FFH, lat  10 us, pow 53708 mW, 1600 MHz
acpicpu0: P13: FFH, lat  10 us, pow 48804 mW, 1500 MHz
acpicpu0: P14: FFH, lat  10 us, pow 41374 mW, 1300 MHz
acpicpu0: P15: FFH, lat  10 us, pow 37783 mW, 1200 MHz
acpicpu0: T0: FFH, lat   1 us, pow 37783 mW, 100 %
acpicpu0: T1: FFH, lat   1 us, pow 35264 mW,  94 %
acpicpu0: T2: FFH, lat   1 us, pow 32745 mW,  88 %
acpicpu0: T3: FFH, lat   1 us, pow 30226 mW,  82 %
acpicpu0: T4: FFH, lat   1 us, pow 27707 mW,  75 %
acpicpu0: T5: FFH, lat   1 us, pow 25188 mW,  69 %
acpicpu0: T6: FFH, lat   1 us, pow 22669 mW,  63 %
acpicpu0: T7: FFH, lat   1 us, pow 20150 mW,  57 %
acpicpu0: T8: FFH, lat   1 us, pow 17632 mW,  50 %
acpicpu0: T9: FFH, lat   1 us, pow 15113 mW,  44 %
acpicpu0: T10: FFH, lat   1 us, pow 12594 mW,  38 %
acpicpu0: T11: FFH, lat   1 us, pow 10075 mW,  32 %
acpicpu0: T12: FFH, lat   1 us, pow  7556 mW,  25 %
acpicpu0: T13: FFH, lat   1 us, pow  5037 mW,  19 %
acpicpu0: T14: FFH, lat   1 us, pow  2518 mW,  13 %
coretemp0 at cpu0: thermal sensor, 1 C resolution
acpicpu1 at cpu1: ACPI CPU
coretemp1 at cpu1: thermal sensor, 1 C resolution
acpicpu2 at cpu2: ACPI CPU
coretemp2 at cpu2: thermal sensor, 1 C resolution
acpicpu3 at cpu3: ACPI CPU
coretemp3 at cpu3: thermal sensor, 1 C resolution
acpicpu4 at cpu4: ACPI CPU
coretemp4 at cpu4: thermal sensor, 1 C resolution
acpicpu5 at cpu5: ACPI CPU
coretemp5 at cpu5: thermal sensor, 1 C resolution
acpicpu6 at cpu6: ACPI CPU
acpicpu7 at cpu7: ACPI CPU
acpicpu8 at cpu8: ACPI CPU
acpicpu9 at cpu9: ACPI CPU
acpicpu10 at cpu10: ACPI CPU
acpicpu11 at cpu11: ACPI CPU
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
uhub0 at usb1: vendor 0x8086 EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhub1 at usb0: vendor 0x8086 EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
ahcisata0 port 2: device present, speed: 3.0Gb/s
wd0 at atabus2 drive 0
wd0: <Samsung SSD 840 Series>
wd0: drive supports 16-sector PIO transfers, LBA48 addressing
wd0: 232 GB, 484521 cyl, 16 head, 63 sec, 512 bytes/sect x 488397168 sectors
wd0: GPT GUID: c092836c-972d-11e2-a3a6-001f1f595752
dk0 at wd0: NetBSD_Boot_SSD
dk0: 488397071 blocks at 64, type: ffs
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd0(ahcisata0:2:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133) 
(using DMA)
uhub2 at uhub1 port 1: vendor 0x8087 product 0x0024, class 9/0, rev 2.00/0.00, 
addr 2
uhub2: single transaction translator
uhub3 at uhub0 port 1: vendor 0x8087 product 0x0024, class 9/0, rev 2.00/0.00, 
addr 2
uhub3: single transaction translator
uhub2: 6 ports with 6 removable, self powered
uhub3: 8 ports with 8 removable, self powered
uhidev0 at uhub2 port 6 configuration 1 interface 0
uhidev0: Winbond Electronics Corp Hermon USB hidmouse Device, rev 1.10/0.01, 
addr 3, iclass 3/1
ums0 at uhidev0: 3 buttons and Z dir
wsmouse0 at ums0 mux 0
uhidev1 at uhub2 port 6 configuration 1 interface 1
uhidev1: Winbond Electronics Corp Hermon USB hidmouse Device, rev 1.10/0.01, 
addr 3, iclass 3/1
ukbd0 at uhidev1: 8 modifier keys, 6 key codes
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
Kernelized RAIDframe activated
pad0: outputs: 44100Hz, 16-bit, stereo
audio0 at pad0: half duplex, playback, capture
boot device: wd0
root on dk0
root file system type: ffs
warning: no /dev/console
ipmi0: version 2.0 interface KCS iobase 0xca2/2 spacing 1

References:
- panic: pmap_tlb_pendcount > 0 failed
  - From: Thomas Klausner
- Re: panic: pmap_tlb_pendcount > 0 failed
  - From: Thomas Klausner
- Re: panic: pmap_tlb_pendcount > 0 failed
  - From: Thomas Klausner

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