ifconfig bridge command crashes the machine

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ifconfig bridge command crashes the machine

Russell Sutherland
>Synopsis:      machine crashes when issuing the ifconfig bridge0 command
>Category:      kernel
>Environment:
        System      : OpenBSD 6.5
        Details     : OpenBSD 6.5-current (GENERIC.MP) #5: Mon Jun  3 07:46:49 MDT 2019
                         [hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP

        Architecture: OpenBSD.amd64
        Machine     : amd64
>Description:
        I began to install resflash (https://stable.rcesoftware.com/resflash/) which is based
        on OpenBSD) to build a small firewall on an PC Engines apu2 board.
        Three interfaces, two bridged and one with an IP for management.

        I found the system would crash and drop down to the debugger interface whenever I issued the
        following command:

        # ifconfig bridge0

        # ifconfig -a

        worked fine. After discussing this with the author we thought it good to try the same configuration on vanilla 6.5 install.

        This worked better, but after a short period of operation the same symptoms occured:
       Here's the output once the machine goes to debugger mode:

        # ifconfig bridge0
        bridge0: flags=4WAR1<UP,RUNNING>
                Nindex 6 llprio ING: SPL NOT
                groups: bridgLOWEe
                priority 327RED68 hellotime 2 f ONwddelay 15 maxag e 20 holdcnt 6 pSYSCALL 5roto rstp
                desi4gnated: id 00:0 3 EXIT 0:00:00:00:00 pri 9
                                                               ority 0
        agsStopped at      savectx+0xb1:   movl    $0,%gs:0x508

        ddb{0}> trace
        savectx(6,0,2000,36,c355527e000,2000) at savectx+0xb1
        end of kernel
        end trace frame: 0x7f7ffffc7110, count: -1

        ddb{0}> ps
           PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
        *46224  143995   8696      0  7         0x3                ifconfig
          8696   43570  33589      0  3    0x10008b  pause         ksh
         66530   17989  42256   1000  3    0x100083  ttyin         ksh
         42256   36958  30199   1000  3        0x90  select        sshd
         30199   96437   8767      0  3        0x92  poll          sshd
         33589   88245      1   1000  3    0x10008b  pause         ksh
         18091  186423      1      0  3    0x100098  poll          cron
          8767  191903      1      0  3        0x80  select        sshd
         27989  421086      1      0  3    0x100080  poll          ntpd
         97042   84751  62847     83  3    0x100092  poll          ntpd
         62847  212783      1     83  3    0x100092  poll          ntpd
         40079  120006  42133     74  3    0x100092  bpf           pflogd
         42133  374913      1      0  3        0x80  netio         pflogd
         96201  180263  25096     73  7    0x100010                syslogd
         25096  134422      1      0  3    0x100082  netio         syslogd
         76419  452607      1     77  3    0x100090  poll          dhclient
         34228  278802      1      0  3        0x80  poll          dhclient
         40538  112849      0      0  3     0x14200  pgzero        zerothread
           423  206500      0      0  3     0x14200  aiodoned      aiodoned
         49841   42087      0      0  3     0x14200  syncer        update
         58735  347035      0      0  3     0x14200  cleaner       cleaner
        85559  498596      0      0  3     0x14200  reaper        reaper
         89148  161365      0      0  3     0x14200  pgdaemon      pagedaemon
          1484  426551      0      0  3     0x14200  bored         crynlk
          5631  299945      0      0  3     0x14200  bored         crypto
           535  138336      0      0  3     0x14200  bored         sensors
         82546  513506      0      0  3     0x14200  mmctsk        sdmmc0
         63560  305248      0      0  3     0x14200  usbtsk        usbtask
         38408  499748      0      0  3     0x14200  usbatsk       usbatsk
         35158  158016      0      0  3  0x40014200  acpi0         acpi0
         71285  459484      0      0  3  0x40014200                idle3
         50258  221210      0      0  7  0x40014200                idle2
         83445  273927      0      0  7  0x40014200                idle1
         53791  120419      0      0  3     0x14200  bored         softnet
         36573  428870      0      0  3     0x14200  bored         systqmp
          5079  392521      0      0  3     0x14200  bored         systq
         33344  155576      0      0  3  0x40014200  bored         softclock
         23065  116565      0      0  3  0x40014200                idle0
         84041  155791      0      0  3     0x14200  bored         smr
             1  278429      0      0  3        0x82  wait          init
             0       0     -1      0  3     0x10200  scheduler     swapper

>How-To-Repeat:
        Issue the ifconfig bridge0 command after a few minutes of operation

>Fix:
        None yet known.

dmesg:
OpenBSD 6.5-current (GENERIC.MP) #5: Mon Jun  3 07:46:49 MDT 2019
    [hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 1996148736 (1903MB)
avail mem = 1925599232 (1836MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.7 @ 0x77fb7020 (7 entries)
bios0: vendor coreboot version "88a4f96" date 03/07/2016
bios0: PC Engines apu2
acpi0 at bios0: rev 2
acpi0: sleep states S0 S1 S2 S3 S4 S5
acpi0: tables DSDT FACP SSDT APIC HEST SSDT SSDT HPET
acpi0: wakeup devices PWRB(S4) PBR4(S4) PBR5(S4) PBR6(S4) PBR7(S4) PBR8(S4) UOH1(S3) UOH3(S3) UOH5(S3) XHC0(S4)
acpitimer0 at acpi0: 3579545 Hz, 32 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: AMD GX-412TC SOC, 998.27 MHz, 16-30-01
cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,PCLMUL,MWAIT,SSSE3,CX16,SSE4.1,SSE4.2,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,IBS,SKINIT,TOPEXT,DBKP,PERFTSC,PCTRL3,ITSC,BMI1,XSAVEOPT
cpu0: 32KB 64b/line 2-way I-cache, 32KB 64b/line 8-way D-cache, 2MB 64b/line 16-way L2 cache
cpu0: ITLB 32 4KB entries fully associative, 8 4MB entries fully associative
cpu0: DTLB 40 4KB entries fully associative, 8 4MB entries fully associative
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 99MHz
cpu0: mwait min=64, max=64, IBE
cpu1 at mainbus0: apid 1 (application processor)
cpu1: AMD GX-412TC SOC, 998.13 MHz, 16-30-01
cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,PCLMUL,MWAIT,SSSE3,CX16,SSE4.1,SSE4.2,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,IBS,SKINIT,TOPEXT,DBKP,PERFTSC,PCTRL3,ITSC,BMI1,XSAVEOPT
cpu1: 32KB 64b/line 2-way I-cache, 32KB 64b/line 8-way D-cache, 2MB 64b/line 16-way L2 cache
cpu1: ITLB 32 4KB entries fully associative, 8 4MB entries fully associative
cpu1: DTLB 40 4KB entries fully associative, 8 4MB entries fully associative
cpu1: smt 0, core 1, package 0
cpu2 at mainbus0: apid 2 (application processor)
cpu2: AMD GX-412TC SOC, 998.13 MHz, 16-30-01
cpu2: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,PCLMUL,MWAIT,SSSE3,CX16,SSE4.1,SSE4.2,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,IBS,SKINIT,TOPEXT,DBKP,PERFTSC,PCTRL3,ITSC,BMI1,XSAVEOPT
cpu2: 32KB 64b/line 2-way I-cache, 32KB 64b/line 8-way D-cache, 2MB 64b/line 16-way L2 cache
cpu2: ITLB 32 4KB entries fully associative, 8 4MB entries fully associative
cpu2: DTLB 40 4KB entries fully associative, 8 4MB entries fully associative
cpu2: smt 0, core 2, package 0
cpu3 at mainbus0: apid 3 (application processor)
cpu3: AMD GX-412TC SOC, 998.20 MHz, 16-30-01
cpu3: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,PCLMUL,MWAIT,SSSE3,CX16,SSE4.1,SSE4.2,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,IBS,SKINIT,TOPEXT,DBKP,PERFTSC,PCTRL3,ITSC,BMI1,XSAVEOPT
cpu3: 32KB 64b/line 2-way I-cache, 32KB 64b/line 8-way D-cache, 2MB 64b/line 16-way L2 cache
cpu3: ITLB 32 4KB entries fully associative, 8 4MB entries fully associative
cpu3: DTLB 40 4KB entries fully associative, 8 4MB entries fully associative
cpu3: smt 0, core 3, package 0
ioapic0 at mainbus0: apid 4 pa 0xfec00000, version 21, 24 pins
ioapic1 at mainbus0: apid 5 pa 0xfec20000, version 21, 32 pins, remapped
acpihpet0 at acpi0: 14318180 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (PBR4)
acpiprt2 at acpi0: bus 1 (PBR5)
acpiprt3 at acpi0: bus 2 (PBR6)
acpiprt4 at acpi0: bus 3 (PBR7)
acpiprt5 at acpi0: bus -1 (PBR8)
acpicpu0 at acpi0: C2(0@400 io@0x1771), C1(@1 halt!), PSS
acpicpu1 at acpi0: C2(0@400 io@0x1771), C1(@1 halt!), PSS
acpicpu2 at acpi0: C2(0@400 io@0x1771), C1(@1 halt!), PSS
acpicpu3 at acpi0: C2(0@400 io@0x1771), C1(@1 halt!), PSS
acpibtn0 at acpi0: PWRB
acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001
acpicmos0 at acpi0
cpu0: 998 MHz: speeds: 1000 800 600 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "AMD AMD64 16h Root Complex" rev 0x00
pchb1 at pci0 dev 2 function 0 "AMD AMD64 16h Host" rev 0x00
ppb0 at pci0 dev 2 function 2 "AMD AMD64 16h PCIE" rev 0x00: msi
pci1 at ppb0 bus 1
em0 at pci1 dev 0 function 0 "Intel I211" rev 0x03: msi, address 00:0d:b9:43:9b:30
ppb1 at pci0 dev 2 function 3 "AMD AMD64 16h PCIE" rev 0x00: msi
pci2 at ppb1 bus 2
em1 at pci2 dev 0 function 0 "Intel I211" rev 0x03: msi, address 00:0d:b9:43:9b:31
ppb2 at pci0 dev 2 function 4 "AMD AMD64 16h PCIE" rev 0x00: msi
pci3 at ppb2 bus 3
em2 at pci3 dev 0 function 0 "Intel I211" rev 0x03: msi, address 00:0d:b9:43:9b:32
ccp0 at pci0 dev 8 function 0 "AMD AMD64 16h Crypto" rev 0x00
xhci0 at pci0 dev 16 function 0 "AMD Bolton xHCI" rev 0x11: msi, xHCI 1.0
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "AMD xHCI root hub" rev 3.00/1.00 addr 1
ahci0 at pci0 dev 17 function 0 "AMD Hudson-2 SATA" rev 0x40: apic 4 int 19, AHCI 1.3
scsibus1 at ahci0: 32 targets
ehci0 at pci0 dev 19 function 0 "AMD Hudson-2 USB2" rev 0x39: apic 4 int 18
usb1 at ehci0: USB revision 2.0
uhub1 at usb1 configuration 1 interface 0 "AMD EHCI root hub" rev 2.00/1.00 addr 1
piixpm0 at pci0 dev 20 function 0 "AMD Hudson-2 SMBus" rev 0x42: SMBus disabled
pcib0 at pci0 dev 20 function 3 "AMD Hudson-2 LPC" rev 0x11
sdhc0 at pci0 dev 20 function 7 "AMD Bolton SD/MMC" rev 0x01: apic 4 int 16
sdhc0: SDHC 2.0, 63 MHz base clock
sdmmc0 at sdhc0: 4-bit, sd high-speed, mmc high-speed, dma
pchb2 at pci0 dev 24 function 0 "AMD AMD64 16h Link Cfg" rev 0x00
pchb3 at pci0 dev 24 function 1 "AMD AMD64 16h Address Map" rev 0x00
pchb4 at pci0 dev 24 function 2 "AMD AMD64 16h DRAM Cfg" rev 0x00
km0 at pci0 dev 24 function 3 "AMD AMD64 16h Misc Cfg" rev 0x00
pchb5 at pci0 dev 24 function 4 "AMD AMD64 16h CPU Power" rev 0x00
pchb6 at pci0 dev 24 function 5 "AMD AMD64 16h Misc Cfg" rev 0x00
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
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
wbsio0 at isa0 port 0x2e/2: NCT5104D rev 0x52
vmm0 at mainbus0: SVM/RVI
umass0 at uhub0 port 3 configuration 1 interface 0 "SanDisk Cruzer Glide" rev 2.00/1.00 addr 2
umass0: using SCSI over Bulk-Only
scsibus2 at umass0: 2 targets, initiator 0
sd0 at scsibus2 targ 1 lun 0: <SanDisk, Cruzer Glide, 1.00> SCSI4 0/direct removable serial.07815575310109112560
sd0: 29952MB, 512 bytes/sector, 61341696 sectors
uhub2 at uhub1 port 1 configuration 1 interface 0 "Advanced Micro Devices product 0x7900" rev 2.00/0.18 addr 2
vscsi0 at root
scsibus3 at vscsi0: 256 targets
softraid0 at root
scsibus4 at softraid0: 256 targets
root on sd0a (d3fbbb47f1a19759.a) swap on sd0b dump on sd0b

usbdevs:
Controller /dev/usb0:
addr 01: 1022:0000 AMD, xHCI root hub
         super speed, self powered, config 1, rev 1.00
         driver: uhub0
addr 02: 0781:5575 SanDisk, Cruzer Glide
         high speed, power 200 mA, config 1, rev 1.00, iSerial 4C530001310109112560
         driver: umass0
Controller /dev/usb1:
addr 01: 1022:0000 AMD, EHCI root hub
         high speed, self powered, config 1, rev 1.00
         driver: uhub1
addr 02: 0438:7900 Advanced Micro Devices, product 0x7900
         high speed, self powered, config 1, rev 0.18
         driver: uhub2




Russell P. Sutherland           Email: russell . sutherland @ utoronto dawt ca
Network Engineer, I+TS       Voice: +1.416.978.0470
4 Bancroft Ave., Rm. 102      Cell: +1.416.803.0080        
University of Toronto            Fax:   +1.416.978.6620
Toronto, ON  M5S 1C1      

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Re: ifconfig bridge command crashes the machine

Martin Pieuchot
On 05/06/19(Wed) 13:09, Russell Sutherland wrote:

> >Synopsis:      machine crashes when issuing the ifconfig bridge0 command
> >Category:      kernel
> >Environment:
>         System      : OpenBSD 6.5
>         Details     : OpenBSD 6.5-current (GENERIC.MP) #5: Mon Jun  3 07:46:49 MDT 2019
>                          [hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
>
>         Architecture: OpenBSD.amd64
>         Machine     : amd64
> >Description:
>         I began to install resflash (https://stable.rcesoftware.com/resflash/) which is based
>         on OpenBSD) to build a small firewall on an PC Engines apu2 board.
>         Three interfaces, two bridged and one with an IP for management.
>
>         I found the system would crash and drop down to the debugger interface whenever I issued the
>         following command:
>
>         # ifconfig bridge0
>
>         # ifconfig -a

Would you mind sharing your /etc/hostname.bridge0.  I can't reproduce
the problem.  It could be exposed by your settings.

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Re: ifconfig bridge command crashes the machine

Russell Sutherland
Sure.  Nothing fancy at all:

# cat /etc/hostname.bridge0
add em0
add em1
up

I have tried the same configuration on OpenBSD 6.4 and there does not seem to be any of the same problems.


Russell P. Sutherland           Email: russell . sutherland @ utoronto dawt ca
Network Engineer, I+TS       Voice: +1.416.978.0470
4 Bancroft Ave., Rm. 102      Cell: +1.416.803.0080
University of Toronto            Fax:   +1.416.978.6620
Toronto, ON  M5S 1C1
________________________________
From: Martin Pieuchot <[hidden email]>
Sent: Tuesday, June 11, 2019 12:34
To: Russell Sutherland
Cc: [hidden email]
Subject: Re: ifconfig bridge command crashes the machine

On 05/06/19(Wed) 13:09, Russell Sutherland wrote:

> >Synopsis:      machine crashes when issuing the ifconfig bridge0 command
> >Category:      kernel
> >Environment:
>         System      : OpenBSD 6.5
>         Details     : OpenBSD 6.5-current (GENERIC.MP) #5: Mon Jun  3 07:46:49 MDT 2019
>                          [hidden email]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
>
>         Architecture: OpenBSD.amd64
>         Machine     : amd64
> >Description:
>         I began to install resflash (https://stable.rcesoftware.com/resflash/) which is based
>         on OpenBSD) to build a small firewall on an PC Engines apu2 board.
>         Three interfaces, two bridged and one with an IP for management.
>
>         I found the system would crash and drop down to the debugger interface whenever I issued the
>         following command:
>
>         # ifconfig bridge0
>
>         # ifconfig -a

Would you mind sharing your /etc/hostname.bridge0.  I can't reproduce
the problem.  It could be exposed by your settings.