Hi! This happens when I plug in a media player, which should attach as an USB mass storage device. Let me know, if more info is needed.
Here is trace's output: ddb{1}> trace Debugger(d6ad12c0,200292,dc1fbe7c,d1dbfa00,0) at Debugger+0x4 panic(d06f0c40,f,dc1fbe9c,dc1fbe8c,d0203269) at panic+0x55 ehci_noop(d1dcf380,200292,dc1fbeac,d035e46d,d1dcf400) at ehci_noop usbd_clear_endpoint_toggle(d1dcf380,d1dbfa14,d06cf1b3,0,d1c9d800) at usbd_clear_endpoint_toggle+0x10 umass_clear_endpoint_stall(d1dbfa00,0,d1c9f800,d1a93000,0) at umass_clear_endpoint_stall+0x28 usb_transfer_complete(d1c9d800,dc10cc60,dc10cc60,d08cccb4,0) at usb_transfer_complete+0x18e ehci_abort_xfer(d1c9d800,f,1,1,d1c9d86c) at ehci_abort_xfer+0x25b echi_timeout_task(d1c9d800,20,d07856a1,0,d6b61984) at ehci_timeout_task+0x1e usb_task_thread(d6b61984) at usb_task_thread+0x51 Bad frame pointer: 0xd0974e88 ddb{1}> ps PID PPID PGRP UID S FLAGS WAIT COMMAND 15558 6195 31869 0 3 0x2004080 piperd cut 517 6195 31869 0 3 0x2004080 piperd sed 5625 6195 31869 0 3 0x2004080 piperd egrep 14793 6195 31869 0 3 0x2004000 scsicmd disklabel 6195 31869 31869 0 3 0x2004080 piperd sh 8336 1 8336 0 3 0x2004082 ttyin ksh 10045 1 10045 0 3 0x2004082 ttyin getty 13702 1 13702 0 3 0x2004082 ttyin getty 15677 1 15677 0 3 0x2004082 ttyin getty 7093 1 7093 0 3 0x2004082 ttyin getty 28460 1 28460 0 3 0x2000080 select cron 31869 1 31869 0 3 0x2000080 htplev hotplugd 19538 1 19538 0 3 0x2000080 kqread apmd [here happened an accident, I can only remember that openvpn, dbus-daemon, cupsd,sshd,inetd,sendmail,lpd ran] 18 0 0 0 3 0x2100200 aiodoned aiodoned 17 0 0 0 3 0x2100200 syncer update 16 0 0 0 3 0x2100200 cleaner cleaner 15 0 0 0 3 0x100200 reaper reaper 14 0 0 0 3 0x2100200 pgdaemon pgdaemon 13 0 0 0 3 0x2100200 pftm pfpurge 12 0 0 0 3 0x2100200 usbevt usb4 11 0 0 0 3 0x2100200 usbevt usb3 10 0 0 0 3 0x2100200 usbevt usb2 9 0 0 0 3 0x2100200 usbevt usb1 *8 0 0 0 3 0x2100200 usbtask 7 0 0 0 3 0x2100200 scsicmd usb0 6 0 0 0 3 0x2100200 acpi_idle acpi0 5 0 0 0 3 0x100200 idle1 4 0 0 0 3 0x2100200 bored syswq 3 0 0 0 3 0x100200 idle0 2 0 0 0 3 0x2100200 kmalloc kmthread 1 0 1 0 3 0x2004080 wait init 0 -1 0 0 3 0x2080200 scheduler swapper ddb{1}> mach ddbcpu 0 ddb{0}> trace Debugger(d08ccc80,d06b6580,1,dbf49000,f0) at Debugger+0x4 i386_ipi_handler(c0,58,d6ac0010,10,f8130010) at i386_ipi_handler+0x4f Xintripi() at Xintripi+0x47 --- interrupt --- __mp_lock(d0818264,5893812e,ac930799,d6ad12c0) at __mp_lock+0x41 __mp_acquire_count(d0818264,1,dc243e60,d0357a85) at __mp_acquire_count+0x1e mi_switch(dc243e88,118,dc243ea0,d0354996,dc243e88) at mi_switch+0x1e4 sleep_finish(dc243e88,1,118,d06d1618,d0) at sleep_finish+0xb7 tsleep(d081e4e8,118,d06f1618,0,d0203269) at tsleep+0x7a sys_poll(d6ad12c0,dc243f68,dc243f58,d6ad12c0) at sys_poll+0x299 syscall() at syscall+0x12b --- syscall (number 252) --- 0x13c0b55: ddb{0}> boot reboot rebooting... and here is my dmesg: OpenBSD 4.5-current (GENERIC.MP) #81: Mon Apr 20 18:47:25 MDT 2009 dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC.MP cpu0: Genuine Intel(R) CPU T2400 @ 1.83GHz ("GenuineIntel" 686-class) 1.83 GHz cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS,A CPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,VMX,EST,TM2,xTPR real mem = 1072066560 (1022MB) avail mem = 1028300800 (980MB) mainbus0 at root bios0 at mainbus0: AT/286+ BIOS, date 08/02/06, BIOS32 rev. 0 @ 0xfd6b0, SMBIOS rev. 2.4 @ 0xe0010 (68 entries) bios0: vendor LENOVO version "79ET66WW (1.10 )" date 08/02/2006 bios0: LENOVO 2007FRG acpi0 at bios0: rev 2 acpi0: tables DSDT FACP SSDT ECDT TCPA APIC MCFG HPET BOOT SSDT SSDT acpi0: wakeup devices LID_(S3) SLPB(S3) LURT(S3) DURT(S3) EXP0(S4) EXP1(S4) EXP2(S4) EXP3(S4) PCI1(S4) USB0(S3) USB1(S3) USB2(S3) USB7(S3) HDEF(S4) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: apic clock running at 166MHz cpu1 at mainbus0: apid 1 (application processor) cpu1: Genuine Intel(R) CPU T2400 @ 1.83GHz ("GenuineIntel" 686-class) 1.83 GHz cpu1: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS,A CPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,VMX,EST,TM2,xTPR ioapic0 at mainbus0: apid 1 pa 0xfec00000, version 20, 24 pins ioapic0: misconfigured as apic 2, remapped to apid 1 acpihpet0 at acpi0: 14318179 Hz acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus 1 (AGP_) acpiprt2 at acpi0: bus 2 (EXP0) acpiprt3 at acpi0: bus 3 (EXP1) acpiprt4 at acpi0: bus 4 (EXP2) acpiprt5 at acpi0: bus 12 (EXP3) acpiprt6 at acpi0: bus 21 (PCI1) acpiec0 at acpi0 acpicpu0 at acpi0: C3, C2 acpicpu1 at acpi0: C3, C2 acpitz0 at acpi0: critical temperature 127 degC acpitz1 at acpi0: critical temperature 99 degC acpibtn0 at acpi0: LID_ acpibtn1 at acpi0: SLPB acpibat0 at acpi0: BAT0 model "42T4511" serial 21826 type LION oem "SANYO" acpibat1 at acpi0: BAT1 not present acpiac0 at acpi0: AC unit online acpithinkpad0 at acpi0 acpidock at acpi0 not configured acpivideo at acpi0 not configured acpivideo at acpi0 not configured bios0: ROM list: 0xc0000/0xfe00 0xd0000/0x1000 0xd1000/0x1000 0xdc000/0x4000! 0xe0000/0x10000 cpu0: unknown Enhanced SpeedStep CPU, msr 0x06130b2c06000b2c cpu0: using only highest and lowest power states cpu0: Enhanced SpeedStep 1833 MHz (1404 mV): speeds: 1833, 1000 MHz pci0 at mainbus0 bus 0: configuration mode 1 (bios) extent `pciio' (0x0 - 0xffff), flags=0 0x1800 - 0x188f 0x18a8 - 0x18cf 0x18e0 - 0x18ff 0x2000 - 0xdfff extent `pcimem' (0x0 - 0xffffffff), flags=0 0x0 - 0xfff 0x2000 - 0x9ffff 0xd2000 - 0xd3fff 0xdc000 - 0x3fffffff 0xd8000000 - 0xee1fffff 0xee400000 - 0xee4047ff 0xf0000000 - 0xf3ffffff 0xfec00000 - 0xfec0ffff 0xfed00000 - 0xfed003ff 0xfed14000 - 0xfed19fff 0xfed1c000 - 0xfed8ffff 0xfee00000 - 0xfee00fff 0xff800000 - 0xffffffff pchb0 at pci0 dev 0 function 0 "Intel 82945GM Host" rev 0x03 ppb0 at pci0 dev 1 function 0 "Intel 82945GM PCIE" rev 0x03: apic 1 int 16 (irq 11) pci1 at ppb0 bus 1 mem address conflict 0xd8000000/0x8000000 extent `ppb0 pciio' (0x0 - 0xffff), flags=0 0x0 - 0x20ff 0x3000 - 0xffff extent `ppb0 pcimem' (0x0 - 0xffffffff), flags=0 0x0 - 0xee10ffff 0xee200000 - 0xffffffff vga1 at pci1 dev 0 function 0 "ATI Radeon Mobility X1400" rev 0x00 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) radeondrm0 at vga1: apic 1 int 16 (irq 11) drm0 at radeondrm0 azalia0 at pci0 dev 27 function 0 "Intel 82801GB HD Audio" rev 0x02: apic 1 int 17 (irq 11) azalia0: codecs: Analog Devices AD1981HD, Conexant/0x2bfa, using Analog Devices AD1981HD audio0 at azalia0 ppb1 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x02: apic 1 int 20 (irq 11) pci2 at ppb1 bus 2 extent `ppb1 pciio' (0x0 - 0xffff), flags=0 0x0 - 0x301f 0x4000 - 0xffff extent `ppb1 pcimem' (0x0 - 0xffffffff), flags=0 0x0 - 0xee01ffff 0xee100000 - 0xffffffff em0 at pci2 dev 0 function 0 "Intel PRO/1000MT (82573L)" rev 0x00: apic 1 int 16 (irq 11), address 00:16:41:aa:d2:70 ppb2 at pci0 dev 28 function 1 "Intel 82801GB PCIE" rev 0x02: apic 1 int 21 (irq 11) pci3 at ppb2 bus 3 extent `ppb2 pciio' (0x0 - 0xffff), flags=0 0x0 - 0x3fff 0x6000 - 0xffff extent `ppb2 pcimem' (0x0 - 0xffffffff), flags=0 0x0 - 0xebffffff 0xedf00000 - 0xedf00fff 0xee000000 - 0xffffffff wpi0 at pci3 dev 0 function 0 "Intel PRO/Wireless 3945ABG" rev 0x02: apic 1 int 17 (irq 11), MoW2, address 00:18:de:65:2d:37 ppb3 at pci0 dev 28 function 2 "Intel 82801GB PCIE" rev 0x02: apic 1 int 22 (irq 11) pci4 at ppb3 bus 4 extent `ppb3 pciio' (0x0 - 0xffff), flags=0 0x0 - 0x5fff 0x8000 - 0xffff extent `ppb3 pcimem' (0x0 - 0xffffffff), flags=0 0x0 - 0xe7ffffff 0xea000000 - 0xffffffff ppb4 at pci0 dev 28 function 3 "Intel 82801GB PCIE" rev 0x02: apic 1 int 23 (irq 11) pci5 at ppb4 bus 12 extent `ppb4 pciio' (0x0 - 0xffff), flags=0 0x0 - 0x7fff 0xa000 - 0xffff extent `ppb4 pcimem' (0x0 - 0xffffffff), flags=0 0x0 - 0xe9ffffff 0xec000000 - 0xffffffff uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x02: apic 1 int 16 (irq 11) uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x02: apic 1 int 17 (irq 11) uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x02: apic 1 int 18 (irq 11) uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x02: apic 1 int 19 (irq 11) ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x02: apic 1 int 19 (irq 11) usb0 at ehci0: USB revision 2.0 uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 ppb5 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xe2 pci6 at ppb5 bus 21 extent `ppb5 pciio' (0x0 - 0xffff), flags=0 0x0 - 0x9fff 0xe000 - 0xffff extent `ppb5 pcimem' (0x0 - 0xffffffff), flags=0 0x0 - 0xe4300fff 0xe8000000 - 0xffffffff cbb0 at pci6 dev 0 function 0 "TI PCI1510 CardBus" rev 0x00: apic 1 int 16 (irq 11) cardslot0 at cbb0 slot 0 flags 0 cardbus0 at cardslot0: bus 22 device 0 cacheline 0x8, lattimer 0xb0 pcmcia0 at cardslot0 ichpcib0 at pci0 dev 31 function 0 "Intel 82801GBM LPC" rev 0x02: PM disabled pciide0 at pci0 dev 31 function 1 "Intel 82801GB IDE" rev 0x02: DMA, channel 0 configured to compatibility, channel 1 configured to compatibility atapiscsi0 at pciide0 channel 0 drive 0 scsibus0 at atapiscsi0: 2 targets cd0 at scsibus0 targ 0 lun 0: <HL-DT-ST, DVDRAM GSA-4083N, 1.08> ATAPI 5/cdrom removable cd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2 pciide0: channel 1 ignored (disabled) ahci0 at pci0 dev 31 function 2 "Intel 82801GBM AHCI" rev 0x02: apic 1 int 16 (irq 11), AHCI 1.1 scsibus1 at ahci0: 32 targets sd0 at scsibus1 targ 0 lun 0: <ATA, FUJITSU MHV2080B, 0084> SCSI3 0/direct fixed sd0: 76319MB, 512 bytes/sec, 156301488 sec total ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x02: apic 1 int 23 (irq 11) iic0 at ichiic0 usb1 at uhci0: USB revision 1.0 uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb2 at uhci1: USB revision 1.0 uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb3 at uhci2: USB revision 1.0 uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb4 at uhci3: USB revision 1.0 uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1 isa0 at ichpcib0 isadma0 at isa0 pckbc0 at isa0 port 0x60/5 pckbd0 at pckbc0 (kbd slot) pckbc0: using irq 1 for kbd slot wskbd0 at pckbd0: console keyboard, using wsdisplay0 pms0 at pckbc0 (aux slot) pckbc0: using irq 12 for aux slot wsmouse0 at pms0 mux 0 pcppi0 at isa0 port 0x61 midi0 at pcppi0: <PC speaker> spkr0 at pcppi0 aps0 at isa0 port 0x1600/31 npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 mtrr: Pentium Pro MTRR support umass0 at uhub0 port 5 configuration 1 interface 0 "SMI Corporation USB DISK" rev 2.00/11.00 addr 2 umass0: using SCSI over Bulk-Only scsibus2 at umass0: 2 targets, initiator 0 sd1 at scsibus2 targ 1 lun 0: <, GOODDRIVEFR, 1100> SCSI0 0/direct removable sd1: 1912MB, 512 bytes/sec, 3915776 sec total ugen0 at uhub4 port 2 "STMicroelectronics Biometric Coprocessor" rev 1.00/0.01 addr 2 uhidev0 at uhub1 port 1 configuration 1 interface 0 "Logitech USB-PS/2 Optical Mouse" rev 2.00/27.20 addr 2 uhidev0: iclass 3/1 ums0 at uhidev0: 8 buttons, Z dir wsmouse1 at ums0 mux 0 softraid0 at root root on sd0a swap on sd0b dump on sd0b WARNING: / was not properly unmounted sd1 detached scsibus2 detached umass0 detached umass0 at uhub0 port 5 configuration 1 interface 0 "SMI Corporation USB DISK" rev 2.00/11.00 addr 2 umass0: using SCSI over Bulk-Only scsibus2 at umass0: 2 targets, initiator 0 sd1 at scsibus2 targ 1 lun 0: <, GOODDRIVEFR, 1100> SCSI0 0/direct removable sd1: 1912MB, 512 bytes/sec, 3915776 sec total -- LIVAI Daniel PGP key ID = 0x4AC0A4B1 Key fingerprint = D037 03B9 C12D D338 4412 2D83 1373 917A 4AC0 A4B1