Yup I'll try. Give me bit of time to find results. Best Regards, -peter
On Mon, May 03, 2021 at 08:27:57AM -0600, Theo de Raadt wrote: > Can you reproduce this, and capture core files? > > Since our tcpdump is a privsep program, getting a core is a bit harder. > > mkdir /var/crash/tcpdump > echo kern.nosuidcoredump=3 >> /etc/sysctl.conf > reboot > > You could recompile tcpdump with -g or -ggdb, to gain better symbols. > > If you manage to create a coredump, run gdb against the unstripped > binary (src/usr.sbin/tcpdump/obj/tcpdump) and let's see what the trace is. > > p...@delphinusdns.org wrote: > > > >Synopsis: Encountered bus error on tcpdumping a cycled interface > > >Category: system > > >Environment: > > System : OpenBSD 6.9 > > Details : OpenBSD 6.9 (GENERIC.MP) #551: Sun Apr 18 03:06:59 MDT > > 2021 > > > > dera...@octeon.openbsd.org:/usr/src/sys/arch/octeon/compile/GENERIC.MP > > > > Architecture: OpenBSD.octeon > > Machine : octeon > > >Description: > > I cycled a vlan (vlan6) interface to down and then back to up with ifconfig > > to > > see if there is traffic flowing I tried tcpdumping and encountered a SIGBUS. > > Here is what I see: > > > > eta# tcpdump -v -n -i vlan6 > > tcpdump: listening on vlan6, link-type EN10MB > > Bus error > > eta# ifconfig vlan6 > > vlan6: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 > > lladdr fc:ec:da:04:8d:69 > > description: RPI Freifunk Franken VLAN > > index 11 priority 0 llprio 3 > > encap: vnetid 6 parent cnmac1 txprio packet rxprio outer > > groups: vlan > > media: Ethernet autoselect (1000baseT full-duplex) > > status: active > > inet 192.168.36.1 netmask 0xffffff00 broadcast 192.168.36.255 > > > > A particular ktrace/kdump revealed this: > > > > 47271 tcpdump RET fstat 0 > > 47271 tcpdump CALL > > mmap(0,0x10000,0x3<PROT_READ|PROT_WRITE>,0x1002<MAP_PRIVATE|MAP_ANON>,-1,0) > > 47271 tcpdump RET mmap 252174057472/0x3ab6bec000 > > 47271 tcpdump CALL fcntl(1,F_ISATTY) > > 47271 tcpdump RET fcntl 1 > > 47271 tcpdump PSIG SIGBUS SIG_DFL code BUS_ADRALN<1> addr=0x39f0f3c04c > > trapno=0 > > > > I assume the fcntl(... could be an isatty(3). > > >How-To-Repeat: > > No idea, I only upgraded this router today and added some networking > > including wireguard tunnels. > > >Fix: > > Not provided. There is mention in comments at: > > > > /usr/src/sys/arch/mips64/mips64/trap.c under BUS_ADRALN that this may be an > > unaligned memory access. > > > > > > dmesg: > > OpenBSD 6.9 (GENERIC.MP) #551: Sun Apr 18 03:06:59 MDT 2021 > > dera...@octeon.openbsd.org:/usr/src/sys/arch/octeon/compile/GENERIC.MP > > real mem = 536870912 (512MB) > > avail mem = 521322496 (497MB) > > random: good seed from bootblocks > > mainbus0 at root: board 20004 rev 0.16, model CN3xxx/CN5xxx > > cpu0 at mainbus0: CN50xx CPU rev 0.1 500 MHz, Software FP emulation > > cpu0: cache L1-I 32KB 4 way D 16KB 64 way, L2 128KB 8 way > > cpu1 at mainbus0: CN50xx CPU rev 0.1 500 MHz, Software FP emulation > > cpu1: cache L1-I 32KB 4 way D 16KB 64 way, L2 128KB 8 way > > clock0 at mainbus0: int 5 > > octcrypto0 at mainbus0 > > iobus0 at mainbus0 > > simplebus0 at iobus0: "soc" > > octciu0 at simplebus0 > > octsmi0 at simplebus0 > > octpip0 at simplebus0 > > octgmx0 at octpip0 interface 0 > > cnmac0 at octgmx0: port 0 RGMII, address fc:ec:da:04:8d:68 > > atphy0 at cnmac0 phy 7: AR8035 10/100/1000 PHY, rev. 2 > > cnmac1 at octgmx0: port 1 RGMII, address fc:ec:da:04:8d:69 > > atphy1 at cnmac1 phy 6: AR8035 10/100/1000 PHY, rev. 2 > > cnmac2 at octgmx0: port 2 RGMII, address fc:ec:da:04:8d:6a > > atphy2 at cnmac2 phy 5: AR8035 10/100/1000 PHY, rev. 2 > > com0 at simplebus0: ns16550a, 64 byte fifo > > com0: console > > dwctwo0 at iobus0 base 0x1180068000000 irq 56 > > usb0 at dwctwo0: USB revision 2.0 > > uhub0 at usb0 configuration 1 interface 0 "Octeon DWC2 root hub" rev > > 2.00/1.00 addr 1 > > octrng0 at iobus0 base 0x1400000000000 irq 0 > > umass0 at uhub0 port 1 configuration 1 interface 0 " UDinfo UF2 4GB" rev > > 2.00/1.00 addr 2 > > umass0: using SCSI over Bulk-Only > > scsibus0 at umass0: 2 targets, initiator 0 > > sd0 at scsibus0 targ 1 lun 0: <, UDinfo UF2 4GB, PMAP> removable > > serial.13fe420077C9177D2781 > > sd0: 3824MB, 512 bytes/sector, 7831552 sectors > > vscsi0 at root > > scsibus1 at vscsi0: 256 targets > > softraid0 at root > > scsibus2 at softraid0: 256 targets > > root on sd0a (d5ffec0c72cad730.a) swap on sd0b dump on sd0b > > WARNING: CHECK AND RESET THE DATE! > > > > usbdevs: > > Controller /dev/usb0: > > addr 01: 0000:0000 Octeon, DWC2 root hub > > high speed, self powered, config 1, rev 1.00 > > driver: uhub0 > > addr 02: 13fe:4200 , UDinfo UF2 4GB > > high speed, power 200 mA, config 1, rev 1.00, iSerial 070877C9177D2781 > > driver: umass0 > > > > pcidump: > > > > acpidump: > >
