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#0 dumpsys () at thread.h:83
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#1 0xc019f9f6 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:370
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#2 0xc01a0146 in panic (fmt=0xc02e3fc6 "from debugger")
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at /usr/src/sys/kern/kern_shutdown.c:767
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#3 0xc0145f02 in db_panic (addr=-1070943602, have_addr=0, count=-1,
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modif=0xce6766d8 "") at /usr/src/sys/ddb/db_command.c:447
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#4 0xc0145e97 in db_command (last_cmdp=0xc033fb70, cmd_table=0x0,
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aux_cmd_tablep=0xc03125a4, aux_cmd_tablep_end=0xc03125a8)
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at /usr/src/sys/ddb/db_command.c:343
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#5 0xc0145f77 in db_command_loop () at /usr/src/sys/ddb/db_command.c:469
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#6 0xc0148afc in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_trap.c:71
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#7 0xc02aaeb3 in kdb_trap (type=3, code=0, regs=0xce676804)
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at /usr/src/sys/platform/pc32/i386/db_interface.c:148
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#8 0xc02c0274 in trap (frame=0xce676804)
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at /usr/src/sys/platform/pc32/i386/trap.c:797
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#9 0xc02abf76 in calltrap ()
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at /usr/src/sys/platform/pc32/i386/exception.s:783
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#10 0xc02ab28e in Debugger (msg=0x12 <Address 0x12 out of bounds>)
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at cpufunc.h:73
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#11 0xc01a013e in panic (
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fmt=0xc02ff3a4 "lwkt_switch: still holding %d exclusive spinlocks!")
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at /usr/src/sys/kern/kern_shutdown.c:765
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#12 0xc01a779c in lwkt_switch () at /usr/src/sys/kern/lwkt_thread.c:529
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#13 0xc01ac9d9 in tsleep (ident=0xcccc2428, flags=0,
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wmesg=0xc02ef4dc "usbsyn", timo=0) at /usr/src/sys/kern/kern_synch.c:452
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#14 0xc027f7bf in usbd_transfer (xfer=0xcccc2428)
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at /usr/src/sys/bus/usb/usbdi.c:341
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#15 0xc027f812 in usbd_sync_transfer (xfer=0x12)
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at /usr/src/sys/bus/usb/usbdi.c:352
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#16 0xc0280175 in usbd_do_request_flags_pipe (dev=0xc7f89e90, pipe=0x12,
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req=0xce6769f4, data=0x12, flags=0, actlen=0x0, timeout=18)
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at /usr/src/sys/bus/usb/usbdi.c:976
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#17 0xc02800f6 in usbd_do_request_flags (dev=0x20, req=0x12, data=0x12,
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flags=0, actlen=0x12, timo=18) at /usr/src/sys/bus/usb/usbdi.c:942
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#18 0xc02800b8 in usbd_do_request (dev=0x12, req=0x12, data=0x12)
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at /usr/src/sys/bus/usb/usbdi.c:934
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#19 0xc027fd26 in usbd_set_interface (iface=0xccd08d00, altidx=18)
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at /usr/src/sys/bus/usb/usbdi.c:697
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#20 0xc042cfe3 in ?? ()
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