> On 05 Jan 2016, at 13:06, Stefan Sperling <s...@stsp.name> wrote:
>
> On Tue, Jan 05, 2016 at 12:29:43PM +0100, Håkon Lerring wrote:
>> Hello misc.
>>
>> I was investigating a problem with a firewall that goes AWOL every week.
It
>> happens only if i activate an ipv6 address on a carp interface. The carp
log
>> has this message:
>>
>> Jan 5 12:10:06 <hostname> /bsd: carp: packet size 48 too small
>>
>> I think i have narrowed down the leak to the handling of too small
>> ipv6-packets:
>>
>> --- ip_carp.c.orig 2016-01-05 12:18:03.000000000 +0100
>> +++ ip_carp.c 2016-01-05 12:18:30.000000000 +0100
>> @@ -562,6 +562,7 @@
>> if ((m = m_pullup(m, *offp + sizeof(*ch))) == NULL) {
>> carpstats.carps_badlen++;
>> CARP_LOG(LOG_INFO, sc, ("packet size %u too small", len));
>> + m_freem(m);
>> return (IPPROTO_DONE);
>> }
>> ch = (struct carp_header *)(mtod(m, caddr_t) + *offp);
>>
>>
>> I have not yet tested this patch since this is a production system. Why
the
>> other machine is sending incomplete packets is another question i'm
currently
>> investigating.
>
> Your patch effectively just calls m_freem(NULL);
> And m_pullup already frees the mbuf on failure.
>
> Can you describe the actual problem you're seeing with more words than
"AWOL"?
Sorry for my hasty conclusion about my problem (i see that i might be wrong
about the cause), i will explain it in more detail.
I have 2 firewalls/routers with multiple carp interfaces (11). 1 on uplink
(carp2) and the rest for different internal networks. All the carp interfaces
are set up as a preemptive failover in case the master goes down. The problem
has two symptoms but i believe they might have the same cause (as they occur
at the same time).
The first symptom is that at what seems to be random times the carp2 interface
(see ifconfig output below) on the backup-machine starts flapping between
backup and master (the designated master does not do the same) and complain
about too small packets:
Jan 7 09:00:11 hostname /bsd: carp2: state transition: BACKUP -> MASTER
Jan 7 09:00:12 hostname /bsd: carp2: state transition: MASTER -> BACKUP
Jan 7 09:00:12 hostname /bsd: carp: packet size 48 too small
Jan 7 09:00:18 hostname last message repeated 6 times
Jan 7 09:00:19 hostname /bsd: carp2: state transition: BACKUP -> MASTER
Jan 7 09:00:19 hostname /bsd: carp2: state transition: MASTER -> BACKUP
Jan 7 09:00:19 hostname /bsd: carp: packet size 48 too small
Jan 7 09:00:25 hostname last message repeated 6 times
Jan 7 09:00:26 hostname /bsd: carp2: state transition: BACKUP -> MASTER
Jan 7 09:00:26 hostname /bsd: carp2: state transition: MASTER -> BACKUP
etc..
The designated master does also log that "packet size 48 too small"
MASTER carp2:
carp2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
lladdr 00:00:5e:00:01:02
description: uplink
priority: 15
carp: MASTER carpdev bnx0 vhid 2 advbase 1 advskew 0
groups: carp
status: master
inet <shared IP> netmask 0xfffffff8 broadcast <broadcast>
inet6 fe80::200:5eff:fe00:102%carp2 prefixlen 64 scopeid 0x16
inet6 <shared ipv6> prefixlen 64
BACKUP carp2:
carp2: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
lladdr 00:00:5e:00:01:02
description: uplink
priority: 15
carp: BACKUP carpdev bnx0 vhid 2 advbase 2 advskew 128
groups: carp
status: backup
inet <shared IP> netmask 0xfffffff8 broadcast <broadcast>
inet6 fe80::200:5eff:fe00:102%carp2 prefixlen 64 scopeid 0x16
inet6 <shared ipv6> prefixlen 64
The other carp interfaces on the same machine does not have this problem. The
only things different about carp2 from the other interfaces is that carp2 has
an IPv6 address and is backed by a bnx interface instead of an em interface
(though this does not seem to be of significance as i have tried it with em
interface with the same result).
The other symptom (which causes most problems) is that at the same time the
amount mbuf clusters starts to increase. I set kern.maxclusters=12288 to stop
it from running out too quickly but i don't think it will ever be satisfied if
i continue to increase the limit. When it runs out of mbuf clusters it just
stops forwarding packets and SSH drops any connection attempts. Here is a
munin graph from this morning:
https://www.dropbox.com/s/j4353z4nl9e22jg/netmem_clusters.png?dl=0
<https://www.dropbox.com/s/j4353z4nl9e22jg/netmem_clusters.png?dl=0> ( sorry
archive users for linking on a mailing list )
The symptoms sometimes disappear after reboot but ocurr again after a while.
Environment:
System : OpenBSD 5.8
Details : OpenBSD 5.8 (GENERIC.MP) #1236: Sun Aug 16 02:31:04 MDT
2015
dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/co
mpile/GENERIC.MP
Architecture: OpenBSD.amd64
Machine : amd64
dmesg:
OpenBSD 5.8 (GENERIC.MP) #1236: Sun Aug 16 02:31:04 MDT 2015
dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 4276432896 (4078MB)
avail mem = 4142936064 (3951MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xee000 (68 entries)
bios0: vendor HP version "P58" date 11/02/2008
bios0: HP ProLiant DL360 G5
acpi0 at bios0: rev 2
acpi0: sleep states S0 S4 S5
acpi0: tables DSDT FACP SPCR MCFG HPET SPMI ERST APIC FFFF BERT HEST SSDT
acpi0: wakeup devices PCI0(S5)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimcfg0 at acpi0 addr 0xe0000000, bus 0-255
acpihpet0 at acpi0: 14318179 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Xeon(R) CPU E5440 @ 2.83GHz, 2833.77 MHz
cpu0:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUS
H,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,EST,TM
2,SSSE3,CX16,xTPR,PDCM,DCA,SSE4.1,XSAVE,NXE,LONG,LAHF,PERF,SENSOR
cpu0: 6MB 64b/line 16-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 333MHz
cpu0: mwait min=64, max=64, C-substates=0.2.2.2, IBE
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Xeon(R) CPU E5440 @ 2.83GHz, 2000.08 MHz
cpu1:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUS
H,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,EST,TM
2,SSSE3,CX16,xTPR,PDCM,DCA,SSE4.1,XSAVE,NXE,LONG,LAHF,PERF,SENSOR
cpu1: 6MB 64b/line 16-way L2 cache
cpu1: smt 0, core 2, package 0
cpu2 at mainbus0: apid 1 (application processor)
cpu2: Intel(R) Xeon(R) CPU E5440 @ 2.83GHz, 2833.44 MHz
cpu2:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUS
H,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,EST,TM
2,SSSE3,CX16,xTPR,PDCM,DCA,SSE4.1,XSAVE,NXE,LONG,LAHF,PERF,SENSOR
cpu2: 6MB 64b/line 16-way L2 cache
cpu2: smt 0, core 1, package 0
cpu3 at mainbus0: apid 3 (application processor)
cpu3: Intel(R) Xeon(R) CPU E5440 @ 2.83GHz, 2656.37 MHz
cpu3:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUS
H,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,EST,TM
2,SSSE3,CX16,xTPR,PDCM,DCA,SSE4.1,XSAVE,NXE,LONG,LAHF,PERF,SENSOR
cpu3: 6MB 64b/line 16-way L2 cache
cpu3: smt 0, core 3, package 0
ioapic0 at mainbus0: apid 8 pa 0xfec00000, version 20, 24 pins
ioapic1 at mainbus0: apid 9 pa 0xfec80000, version 20, 24 pins
acpiprt0 at acpi0: bus 1 (IP2P)
acpiprt1 at acpi0: bus 11 (IPE1)
acpiprt2 at acpi0: bus 10 (IPE4)
acpiprt3 at acpi0: bus 16 (P2P2)
acpiprt4 at acpi0: bus 9 (PT02)
acpiprt5 at acpi0: bus 6 (PT03)
acpiprt6 at acpi0: bus 19 (PT04)
acpiprt7 at acpi0: bus 3 (NB01)
acpiprt8 at acpi0: bus 5 (NB02)
acpiprt9 at acpi0: bus 0 (PCI0)
acpicpu0 at acpi0: !C3(250@17 io@0x915), !C2(500@1 io@0x914), C1(1000@1 halt)
acpicpu1 at acpi0: !C3(250@17 io@0x915), !C2(500@1 io@0x914), C1(1000@1 halt)
acpicpu2 at acpi0: !C3(250@17 io@0x915), !C2(500@1 io@0x914), C1(1000@1 halt)
acpicpu3 at acpi0: !C3(250@17 io@0x915), !C2(500@1 io@0x914), C1(1000@1 halt)
acpitz0 at acpi0: critical temperature is 31 degC
ipmi at mainbus0 not configured
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 5000P Host" rev 0xb1
ppb0 at pci0 dev 2 function 0 "Intel 5000 PCIE" rev 0xb1
pci1 at ppb0 bus 9
ppb1 at pci1 dev 0 function 0 "Intel 6321ESB PCIE" rev 0x01
pci2 at ppb1 bus 10
ppb2 at pci2 dev 0 function 0 "Intel 6321ESB PCIE" rev 0x01
pci3 at ppb2 bus 11
em0 at pci3 dev 0 function 0 "Intel 82571EB" rev 0x06: apic 8 int 16, address
00:1f:29:61:57:4a
em1 at pci3 dev 0 function 1 "Intel 82571EB" rev 0x06: apic 8 int 17, address
00:1f:29:61:57:4b
ppb3 at pci2 dev 1 function 0 "Intel 6321ESB PCIE" rev 0x01
pci4 at ppb3 bus 14
ppb4 at pci2 dev 2 function 0 "Intel 6321ESB PCIE" rev 0x01
pci5 at ppb4 bus 15
ppb5 at pci1 dev 0 function 3 "Intel 6321ESB PCIE-PCIX" rev 0x01
pci6 at ppb5 bus 16
ppb6 at pci0 dev 3 function 0 "Intel 5000 PCIE" rev 0xb1
pci7 at ppb6 bus 6
ppb7 at pci7 dev 0 function 0 "ServerWorks PCIE-PCIX" rev 0xb4
pci8 at ppb7 bus 7
ppb8 at pci8 dev 4 function 0 "ServerWorks HT-1000 PCIX" rev 0xb2
pci9 at ppb8 bus 8
ciss0 at pci8 dev 8 function 0 "Hewlett-Packard Smart Array" rev 0x00: apic 8
int 16
ciss0: 1 LD, HW rev 0, FW 1.80/1.80
scsibus1 at ciss0: 1 targets
sd0 at scsibus1 targ 0 lun 0: <HP, LOGICAL VOLUME, 1.80> SCSI3 0/direct fixed
sd0: 69973MB, 512 bytes/sector, 143305920 sectors
ppb9 at pci0 dev 4 function 0 "Intel 5000 PCIE x8" rev 0xb1
pci10 at ppb9 bus 19
ppb10 at pci0 dev 5 function 0 "Intel 5000 PCIE" rev 0xb1
pci11 at ppb10 bus 22
ppb11 at pci0 dev 6 function 0 "Intel 5000 PCIE" rev 0xb1
pci12 at ppb11 bus 2
ppb12 at pci12 dev 0 function 0 "ServerWorks PCIE-PCIX" rev 0xc3
pci13 at ppb12 bus 3
bnx0 at pci13 dev 0 function 0 "Broadcom BCM5708" rev 0x12: apic 8 int 18
ppb13 at pci0 dev 7 function 0 "Intel 5000 PCIE" rev 0xb1
pci14 at ppb13 bus 4
ppb14 at pci14 dev 0 function 0 "ServerWorks PCIE-PCIX" rev 0xc3
pci15 at ppb14 bus 5
bnx1 at pci15 dev 0 function 0 "Broadcom BCM5708" rev 0x12: apic 8 int 19
pchb1 at pci0 dev 16 function 0 "Intel 5000 Error Reporting" rev 0xb1
pchb2 at pci0 dev 16 function 1 "Intel 5000 Error Reporting" rev 0xb1
pchb3 at pci0 dev 16 function 2 "Intel 5000 Error Reporting" rev 0xb1
pchb4 at pci0 dev 17 function 0 "Intel 5000 Reserved" rev 0xb1
pchb5 at pci0 dev 19 function 0 "Intel 5000 Reserved" rev 0xb1
pchb6 at pci0 dev 21 function 0 "Intel 5000 FBD" rev 0xb1
pchb7 at pci0 dev 22 function 0 "Intel 5000 FBD" rev 0xb1
uhci0 at pci0 dev 29 function 0 "Intel 6321ESB USB" rev 0x09: apic 8 int 16
uhci1 at pci0 dev 29 function 1 "Intel 6321ESB USB" rev 0x09: apic 8 int 17
uhci2 at pci0 dev 29 function 2 "Intel 6321ESB USB" rev 0x09: apic 8 int 18
uhci3 at pci0 dev 29 function 3 "Intel 6321ESB USB" rev 0x09: apic 8 int 19
ehci0 at pci0 dev 29 function 7 "Intel 6321ESB USB" rev 0x09: apic 8 int 16
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb15 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xd9
pci16 at ppb15 bus 1
radeondrm0 at pci16 dev 3 function 0 "ATI ES1000" rev 0x02
drm0 at radeondrm0
radeondrm0: apic 8 int 23
"Compaq iLO" rev 0x03 at pci16 dev 4 function 0 not configured
"Compaq iLO" rev 0x03 at pci16 dev 4 function 2 not configured
uhci4 at pci16 dev 4 function 4 "Hewlett-Packard USB" rev 0x00: apic 8 int 22
"Hewlett-Packard IPMI" rev 0x00 at pci16 dev 4 function 6 not configured
usb1 at uhci4: USB revision 1.0
uhub1 at usb1 "Hewlett-Packard UHCI root hub" rev 1.00/1.00 addr 1
pcib0 at pci0 dev 31 function 0 "Intel 6321ESB LPC" rev 0x09
pciide0 at pci0 dev 31 function 1 "Intel 6321ESB IDE" rev 0x09: DMA, channel 0
configured to compatibility, channel 1 configured to compatibility
atapiscsi0 at pciide0 channel 0 drive 0
scsibus2 at atapiscsi0: 2 targets
cd0 at scsibus2 targ 0 lun 0: <HL-DT-ST, DVDRAM GSA-T40L, KS03> ATAPI 5/cdrom
removable
cd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2
pciide0: channel 1 disabled (no drives)
usb2 at uhci0: USB revision 1.0
uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb3 at uhci1: USB revision 1.0
uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb4 at uhci2: USB revision 1.0
uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb5 at uhci3: USB revision 1.0
uhub5 at usb5 "Intel UHCI root hub" rev 1.00/1.00 addr 1
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
com1: probed fifo depth: 0 bytes
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
uhidev0 at uhub1 port 1 configuration 1 interface 0 "HP Virtual Keyboard" rev
1.10/0.02 addr 2
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 variable keys, 6 key codes, country code 33
wskbd1 at ukbd0 mux 1
uhidev1 at uhub1 port 1 configuration 1 interface 1 "HP Virtual Keyboard" rev
1.10/0.02 addr 2
uhidev1: iclass 3/1
ums0 at uhidev1: 3 buttons
wsmouse0 at ums0 mux 0
uhub6 at uhub1 port 2 "HP Virtual Hub" rev 1.10/0.01 addr 3
uhidev2 at uhub3 port 2 configuration 1 interface 0 "Avocent Dell 03R874" rev
1.10/1.00 addr 2
uhidev2: iclass 3/1
ukbd1 at uhidev2: 8 variable keys, 6 key codes, country code 33
wskbd2 at ukbd1 mux 1
uhidev3 at uhub3 port 2 configuration 1 interface 1 "Avocent Dell 03R874" rev
1.10/1.00 addr 2
uhidev3: iclass 3/1, 3 report ids
ums1 at uhidev3 reportid 1: 5 buttons, Z dir
wsmouse1 at ums1 mux 0
uhid0 at uhidev3 reportid 2: input=2, output=0, feature=0
uhid1 at uhidev3 reportid 3: input=1, output=0, feature=0
vscsi0 at root
scsibus3 at vscsi0: 256 targets
softraid0 at root
scsibus4 at softraid0: 256 targets
root on sd0a (0f18f0dd8d57a1aa.a) swap on sd0b dump on sd0b
bnx0: address 00:23:7d:33:11:c2
brgphy0 at bnx0 phy 1: BCM5708C 10/100/1000baseT PHY, rev. 6
bnx1: address 00:23:7d:33:11:c0
brgphy1 at bnx1 phy 1: BCM5708C 10/100/1000baseT PHY, rev. 6
error: [drm:pid0:r100_cp_init_microcode] *ERROR* radeon_cp: Failed to load
firmware "radeon-r100_cp"
error: [drm:pid0:r100_cp_init] *ERROR* Failed to load firmware!
drm:pid0:r100_startup *ERROR* failed initializing CP (-2).
drm:pid0:r100_init *ERROR* Disabling GPU acceleration
radeondrm0: 1024x768
wsdisplay0 at radeondrm0 mux 1: console (std, vt100 emulation), using wskbd0
wskbd1: connecting to wsdisplay0
wskbd2: connecting to wsdisplay0
wsdisplay0: screen 1-5 added (std, vt100 emulation)
carp: packet size 48 too small
carp: packet size 48 too small
<REMOVED 1030 REPEATED LINES>
carp: packet size 48 too small
carp: packet size 48 too small
carp: packet size 48 too small
