panic after re(4) watchdog timeouts

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panic after re(4) watchdog timeouts

Anthony J. Bentley-4
Hi,

I just hit the following panic. The machine had been under heavy network
load (tens of megabits per second) for several hours. Every ten or
twenty minutes it would lose network, hit a re(4) watchdog timeout (a
recurring problem on this machine: https://marc.info/?m=143701763323995),
then recover network.

Shortly before the panic, network didn't come back after the watchdog,
it just kept hitting it:

re0: watchdog timeout
last message repeated 3 times

A few seconds later I got this panic.

panic: pool_cache_item_magic_check: mcl9k cpu free list modified: item addr 0xfffffd803eeedec0+16 0x6360000b9783c00!=0xac53d3f74cca7713
Stopped at      db_enter+0x12:  popq    %r11
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 373210  81751     35        0x12       0x80    2  Xorg
db_enter() at db_enter+0x12
panic() at panic+0x128
pool_cache_get(ffffffff81da7e20) at pool_cache_get+0x26c
pool_get(ffffffff81da7e20,2) at pool_get+0x6a
m_clget(0,2,2400) at m_clget+0x1ca)
re_newbuf(ffff800000187000) at re_newbuf+0x3e
re_rxeof(ffff800000187000) at re_rxeof+0x3b8
re_intr(ffff800000187000) at re_intr+0xf8
intr_handler(ffff800022079ec0,ffff800000135180) at intr_handler+0x6e
Xintr_ioapic_edge23_untramp(0,33,1388,0,33,ffffffff81d2e6d0) at Xintr_ioapic_edge23_untramp+0x19f
acpicpu_idle() at acpicpu_idle+0x1eb
sched_idle(fffff81d2dff0) at sched_idle+0x205
end trace frame: 0x0, count: 3
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.


OpenBSD 6.5-beta (GENERIC.MP) #828: Sun Mar 24 03:48:54 MDT 2019
    [hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 34283499520 (32695MB)
avail mem = 33234137088 (31694MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xec2b0 (89 entries)
bios0: vendor American Megatrends Inc. version "2205" date 10/09/2014
bios0: ASUS All Series
acpi0 at bios0: rev 2
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP APIC FPDT SSDT SSDT SSDT MCFG HPET SSDT SSDT
acpi0: wakeup devices PEGP(S4) PEG0(S4) PEGP(S4) PEG1(S4) PEGP(S4) PEG2(S4) UAR1(S4) PXSX(S4) RP01(S4) PXSX(S4) RP02(S4) PXSX(S4) RP03(S4) PXSX(S4) RP04(S4) PXSX(S4) [...]
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) Core(TM) i5-4590 CPU @ 3.30GHz, 3292.87 MHz, 06-3c-03
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,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,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=0.2.1.2.4, IBE
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Core(TM) i5-4590 CPU @ 3.30GHz, 3292.39 MHz, 06-3c-03
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,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 0, core 1, package 0
cpu2 at mainbus0: apid 4 (application processor)
cpu2: Intel(R) Core(TM) i5-4590 CPU @ 3.30GHz, 3292.39 MHz, 06-3c-03
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,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,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) Core(TM) i5-4590 CPU @ 3.30GHz, 3292.39 MHz, 06-3c-03
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,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,PERF,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,IBRS,IBPB,STIBP,L1DF,SSBD,SENSOR,ARAT,XSAVEOPT,MELTDOWN
cpu3: 256KB 64b/line 8-way L2 cache
cpu3: smt 0, core 3, package 0
ioapic0 at mainbus0: apid 8 pa 0xfec00000, version 20, 24 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xf8000000, bus 0-63
acpihpet0 at acpi0: 14318179 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 1 (PEG0)
acpiprt2 at acpi0: bus -1 (PEG1)
acpiprt3 at acpi0: bus -1 (PEG2)
acpiprt4 at acpi0: bus 2 (RP01)
acpiprt5 at acpi0: bus -1 (RP02)
acpiprt6 at acpi0: bus 3 (RP03)
acpiprt7 at acpi0: bus 4 (RP04)
acpiprt8 at acpi0: bus -1 (RP05)
acpiprt9 at acpi0: bus -1 (RP06)
acpiprt10 at acpi0: bus -1 (RP07)
acpiprt11 at acpi0: bus -1 (RP08)
acpiec0 at acpi0: not present
acpicpu0 at acpi0: C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpicpu1 at acpi0: C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpicpu2 at acpi0: C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpicpu3 at acpi0: C2(200@148 mwait.1@0x33), C1(1000@1 mwait.1), PSS
acpipwrres0 at acpi0: PG00, resource for PEG0
acpipwrres1 at acpi0: PG01, resource for PEG1
acpipwrres2 at acpi0: PG02, resource for PEG2
acpipwrres3 at acpi0: FN00, resource for FAN0
acpipwrres4 at acpi0: FN01, resource for FAN1
acpipwrres5 at acpi0: FN02, resource for FAN2
acpipwrres6 at acpi0: FN03, resource for FAN3
acpipwrres7 at acpi0: FN04, resource for FAN4
acpitz0 at acpi0: critical temperature is 105 degC
acpitz1 at acpi0: critical temperature is 105 degC
acpipci0 at acpi0 PCI0: 0x00000010 0x00000011 0x00000000
acpicmos0 at acpi0
"PNP0C14" at acpi0 not configured
acpibtn0 at acpi0: PWRB
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
"PNP0A0A" at acpi0 not configured
"PNP0C14" at acpi0 not configured
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: DD1F
cpu0: Enhanced SpeedStep 3292 MHz: speeds: 3301, 3300, 3100, 2900, 2800, 2600, 2400, 2200, 2000, 1900, 1700, 1500, 1300, 1200, 1000, 800 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Core 4G Host" rev 0x06
ppb0 at pci0 dev 1 function 0 "Intel Core 4G PCIE" rev 0x06: msi
pci1 at ppb0 bus 1
radeondrm0 at pci1 dev 0 function 0 "ATI Radeon HD 5450" rev 0x00
drm0 at radeondrm0
radeondrm0: msi
azalia0 at pci1 dev 0 function 1 "ATI Radeon HD 5470 Audio" rev 0x00: msi
azalia0: no supported codecs
xhci0 at pci0 dev 20 function 0 "Intel 9 Series xHCI" rev 0x00: msi, xHCI 1.0
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 addr 1
"Intel 9 Series MEI" rev 0x00 at pci0 dev 22 function 0 not configured
ehci0 at pci0 dev 26 function 0 "Intel 9 Series USB" rev 0x00: apic 8 int 20
usb1 at ehci0: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
azalia1 at pci0 dev 27 function 0 "Intel 9 Series HD Audio" rev 0x00: msi
azalia1: codecs: Realtek/0x0887
audio0 at azalia1
ppb1 at pci0 dev 28 function 0 "Intel 9 Series PCIE" rev 0xd0: msi
pci2 at ppb1 bus 2
nvme0 at pci2 dev 0 function 0 "Samsung SM981/PM981 NVMe" rev 0x00: msi, NVMe 1.3
nvme0: Samsung SSD 970 EVO 500GB, firmware 2B2QEXE7, serial S466NX1KB27570N
scsibus1 at nvme0: 1 targets
sd0 at scsibus1 targ 0 lun 0: <NVMe, Samsung SSD 970, 2B2Q> SCSI4 0/direct fixed
sd0: 476940MB, 512 bytes/sector, 976773168 sectors
ppb2 at pci0 dev 28 function 2 "Intel 9 Series PCIE" rev 0xd0: msi
pci3 at ppb2 bus 3
re0 at pci3 dev 0 function 0 "Realtek 8168" rev 0x11: RTL8168G/8111G (0x4c00), msi, address 08:62:66:2e:95:0a
rgephy0 at re0 phy 7: RTL8251 PHY, rev. 0
ppb3 at pci0 dev 28 function 3 "Intel 9 Series PCIE" rev 0xd0: msi
pci4 at ppb3 bus 4
vendor "Conexant", unknown product 0x8880 (class multimedia subclass video, rev 0x04) at pci4 dev 0 function 0 not configured
ehci1 at pci0 dev 29 function 0 "Intel 9 Series USB" rev 0x00: apic 8 int 23
usb2 at ehci1: USB revision 2.0
uhub2 at usb2 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
pcib0 at pci0 dev 31 function 0 "Intel H97 LPC" rev 0x00
ahci0 at pci0 dev 31 function 2 "Intel 9 Series AHCI" rev 0x00: msi, AHCI 1.3
ahci0: port 0: 6.0Gb/s
ahci0: port 1: 6.0Gb/s
ahci0: port 2: 6.0Gb/s
ahci0: port 3: 6.0Gb/s
scsibus2 at ahci0: 32 targets
sd1 at scsibus2 targ 0 lun 0: <ATA, Samsung SSD 860, RVT0> SCSI3 0/direct fixed naa.5002538e40a4c671
sd1: 476940MB, 512 bytes/sector, 976773168 sectors, thin
sd2 at scsibus2 targ 1 lun 0: <ATA, WDC WD20EZRZ-00Z, 80.0> SCSI3 0/direct fixed naa.50014ee2bb1c1ab4
sd2: 1907729MB, 512 bytes/sector, 3907029168 sectors
sd3 at scsibus2 targ 2 lun 0: <ATA, ST2000VM003-1CT1, SC23> SCSI3 0/direct fixed naa.5000c50072de892f
sd3: 1907729MB, 512 bytes/sector, 3907029168 sectors
sd4 at scsibus2 targ 3 lun 0: <ATA, Hitachi HDS5C302, ML6O> SCSI3 0/direct fixed naa.5000cca369cec8f2
sd4: 1907729MB, 512 bytes/sector, 3907029168 sectors
ichiic0 at pci0 dev 31 function 3 "Intel 9 Series SMBus" rev 0x00: apic 8 int 18
iic0 at ichiic0
spdmem0 at iic0 addr 0x50: 8GB DDR3 SDRAM PC3-12800
spdmem1 at iic0 addr 0x51: 8GB DDR3 SDRAM PC3-12800
spdmem2 at iic0 addr 0x52: 8GB DDR3 SDRAM PC3-12800
spdmem3 at iic0 addr 0x53: 8GB DDR3 SDRAM PC3-12800
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0 mux 1
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vmm0 at mainbus0: VMX/EPT
efifb at mainbus0 not configured
uhidev0 at uhub0 port 9 configuration 1 interface 0 "Microsoft Natural\M-. Ergonomic Keyboard 4000" rev 2.00/1.73 addr 2
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 variable keys, 6 key codes
wskbd1 at ukbd0 mux 1
uhidev1 at uhub0 port 9 configuration 1 interface 1 "Microsoft Natural\M-. Ergonomic Keyboard 4000" rev 2.00/1.73 addr 2
uhidev1: iclass 3/0, 1 report id
uhid0 at uhidev1 reportid 1: input=7, output=0, feature=0
uplcom0 at uhub0 port 11 configuration 1 interface 0 "Prolific Technology Inc. USB 2.0 To COM Device" rev 1.10/3.00 addr 3
ucom0 at uplcom0
uhidev2 at uhub0 port 13 configuration 1 interface 0 "Logitech USB Receiver" rev 2.00/24.07 addr 4
uhidev2: iclass 3/1
ukbd1 at uhidev2: 8 variable keys, 6 key codes
wskbd2 at ukbd1 mux 1
uhidev3 at uhub0 port 13 configuration 1 interface 1 "Logitech USB Receiver" rev 2.00/24.07 addr 4
uhidev3: iclass 3/1, 8 report ids
ums0 at uhidev3 reportid 2: 16 buttons, Z and W dir
wsmouse0 at ums0 mux 0
uhid1 at uhidev3 reportid 3: input=4, output=0, feature=0
uhid2 at uhidev3 reportid 4: input=1, output=0, feature=0
uhid3 at uhidev3 reportid 8: input=1, output=0, feature=0
uhidev4 at uhub0 port 13 configuration 1 interface 2 "Logitech USB Receiver" rev 2.00/24.07 addr 4
uhidev4: iclass 3/0, 33 report ids
uhid4 at uhidev4 reportid 16: input=6, output=6, feature=0
uhid5 at uhidev4 reportid 17: input=19, output=19, feature=0
uhid6 at uhidev4 reportid 32: input=14, output=14, feature=0
uhid7 at uhidev4 reportid 33: input=31, output=31, feature=0
uhub3 at uhub1 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2
uhub4 at uhub2 port 1 configuration 1 interface 0 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2
vscsi0 at root
scsibus3 at vscsi0: 256 targets
softraid0 at root
scsibus4 at softraid0: 256 targets
root on sd1a (5b38f95c398ae344.a) swap on sd1b dump on sd1b
WARNING: / was not properly unmounted
initializing kernel modesetting (CEDAR 0x1002:0x68F9 0x1545:0x5450).
error: [drm:pid0:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 128
Raw EDID:
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
error: [drm:pid0:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 128
Raw EDID:
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
error: [drm:pid0:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 128
Raw EDID:
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
error: [drm:pid0:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 128
Raw EDID:
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
drm:pid0:drm_do_get_edid *WARNING* DVI-I-: Ignoring invalid EDID block 1.
error: [drm:pid0:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 128
Raw EDID:
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
error: [drm:pid0:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 128
Raw EDID:
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
error: [drm:pid0:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 128
Raw EDID:
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
error: [drm:pid0:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 128
Raw EDID:
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
  ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
drm:pid0:drm_do_get_edid *WARNING* DVI-I-: Ignoring invalid EDID block 1.
radeondrm0: 2560x1440, 32bpp
wsdisplay0 at radeondrm0 mux 1: console (std, vt100 emulation)
pckbd_enable: command error
wskbd1: connecting to wsdisplay0
wskbd2: connecting to wsdisplay0
wsdisplay0: screen 1-5 added (std, vt100 emulation)