kern/178612: [run] kernel panic due the problems with run driver

Sergey Maltsev core.dumped.sm at gmail.com
Wed May 15 04:40:03 UTC 2013 

The following reply was made to PR kern/178612; it has been noted by GNATS.

From: Sergey Maltsev <core.dumped.sm at gmail.com>
To: freebsd-gnats-submit at FreeBSD.org
Cc:  
Subject: kern/178612: [run] kernel panic due the problems with run driver
Date: Tue, 14 May 2013 05:21:22 GMT

 >Number:         178612
 >Category:       kern
 >Synopsis:       [run] kernel panic due the problems with run driver
 >Confidential:   no
 >Severity:       non-critical
 >Priority:       low
 >Responsible:    freebsd-bugs
 >State:          open
 >Quarter:        
 >Keywords:       
 >Date-Required:
 >Class:          sw-bug
 >Submitter-Id:   current-users
 >Arrival-Date:   Tue May 14 05:30:00 UTC 2013
 >Closed-Date:
 >Last-Modified:
 >Originator:     Sergey Maltsev
 >Release:        8.3-RELEASE i386
 >Organization:
 >Environment:
 FreeBSD sergio.uralttk.ru 8.3-RELEASE-p6 FreeBSD 8.3-RELEASE-p6 #0: Mon Apr  1 10:56:55 YEKT 2013     root at sergio.uralttk.ru:/usr/obj/usr/src/sys/SERGIO  i386
 >Description:
 I am using Asus USB-N11 wireless card as host AP:
 ugen4.2: <802.11 n WLAN Ralink> at usbus4, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON
 
   bLength = 0x0012 
   bDescriptorType = 0x0001 
   bcdUSB = 0x0200 
   bDeviceClass = 0x0000 
   bDeviceSubClass = 0x0000 
   bDeviceProtocol = 0x0000 
   bMaxPacketSize0 = 0x0040 
   idVendor = 0x1761 
   idProduct = 0x0b05 
   bcdDevice = 0x0101 
   iManufacturer = 0x0001  <Ralink>
   iProduct = 0x0002  <802.11 n WLAN>
   iSerialNumber = 0x0003  <1.0>
   bNumConfigurations = 0x0001 
 Regularly there are unpredictable reboot because of problems with the device driver:
 
 last trap:
 # kgdb kernel.debug /var/crash/vmcore.13
 GNU gdb 6.1.1 [FreeBSD]
 Copyright 2004 Free Software Foundation, Inc.
 GDB is free software, covered by the GNU General Public License, and you are
 welcome to change it and/or distribute copies of it under certain conditions.
 Type "show copying" to see the conditions.
 There is absolutely no warranty for GDB.  Type "show warranty" for details.
 This GDB was configured as "i386-marcel-freebsd"...
 
 Unread portion of the kernel message buffer:
 
 
 Fatal trap 12: page fault while in kernel mode
 cpuid = 1; apic id = 01
 fault virtual address   = 0x1908
 fault code              = supervisor read, page not present
 instruction pointer     = 0x20:0xc0c209df
 stack pointer           = 0x28:0xe857ac38
 frame pointer           = 0x28:0xe857ac64
 code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, def32 1, gran 1
 processor eflags        = interrupt enabled, resume, IOPL = 0
 current process         = 0 (run0 taskq)
 trap number             = 12
 panic: page fault
 cpuid = 1
 KDB: stack backtrace:
 #0 0xc06c4177 at kdb_backtrace+0x47
 #1 0xc06942e7 at panic+0x117
 #2 0xc0935d53 at trap_fatal+0x323
 #3 0xc0935de9 at trap_pfault+0x89
 #4 0xc0936b23 at trap+0x443
 #5 0xc091db1c at calltrap+0x6
 #6 0xc0c234a5 at run_ratectl_cb+0x65
 #7 0xc06d049a at taskqueue_run_locked+0xca
 #8 0xc06d062c at taskqueue_thread_loop+0xbc
 #9 0xc0667857 at fork_exit+0x97
 #10 0xc091db94 at fork_trampoline+0x8
 Uptime: 4m47s
 Physical memory: 2027 MB
 Dumping 193 MB: 178 162 146 130panic: bufwrite: buffer is not busy???
 cpuid = 1
  114 98 82 66 50 34 18 2
 
 Reading symbols from /boot/kernel/if_run.ko...Reading symbols from /boot/kernel/if_run.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/if_run.ko
 Reading symbols from /boot/kernel/wlan.ko...Reading symbols from /boot/kernel/wlan.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan.ko
 Reading symbols from /boot/modules/nvidia.ko...done.
 Loaded symbols for /boot/modules/nvidia.ko
 Reading symbols from /boot/kernel/linux.ko...Reading symbols from /boot/kernel/linux.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/linux.ko
 Reading symbols from /boot/kernel/runfw.ko...Reading symbols from /boot/kernel/runfw.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/runfw.ko
 Reading symbols from /boot/kernel/linprocfs.ko...Reading symbols from /boot/kernel/linprocfs.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/linprocfs.ko
 Reading symbols from /usr/local/libexec/linux_adobe/linux_adobe.ko...done.
 Loaded symbols for /usr/local/libexec/linux_adobe/linux_adobe.ko
 Reading symbols from /boot/kernel/blank_saver.ko...Reading symbols from /boot/kernel/blank_saver.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/blank_saver.ko
 Reading symbols from /boot/kernel/wlan_xauth.ko...Reading symbols from /boot/kernel/wlan_xauth.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_xauth.ko
 Reading symbols from /boot/kernel/wlan_wep.ko...Reading symbols from /boot/kernel/wlan_wep.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_wep.ko
 Reading symbols from /boot/kernel/wlan_tkip.ko...Reading symbols from /boot/kernel/wlan_tkip.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_tkip.ko
 Reading symbols from /boot/kernel/wlan_ccmp.ko...Reading symbols from /boot/kernel/wlan_ccmp.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_ccmp.ko
 #0  doadump () at pcpu.h:244
 244             __asm("movl %%fs:0,%0" : "=r" (td));
 (kgdb) backtrace
 #0  doadump () at pcpu.h:244
 #1  0xc0694083 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:441
 #2  0xc0694320 in panic (fmt=Variable "fmt" is not available.
 ) at /usr/src/sys/kern/kern_shutdown.c:614
 #3  0xc0935d53 in trap_fatal (frame=0xe857abf8, eva=6408) at /usr/src/sys/i386/i386/trap.c:981
 #4  0xc0935de9 in trap_pfault (frame=0xe857abf8, usermode=0, eva=6408) at /usr/src/sys/i386/i386/trap.c:843
 #5  0xc0936b23 in trap (frame=0xe857abf8) at /usr/src/sys/i386/i386/trap.c:562
 #6  0xc091db1c in calltrap () at /usr/src/sys/i386/i386/exception.s:168
 #7  0xc0c209df in run_drain_fifo (arg=0xc6749000) at /usr/src/sys/modules/usb/run/../../../dev/usb/wlan/if_run.c:2251
 #8  0xc0c234a5 in run_ratectl_cb (arg=0xc6749000, pending=1)
     at /usr/src/sys/modules/usb/run/../../../dev/usb/wlan/if_run.c:2216
 #9  0xc06d049a in taskqueue_run_locked (queue=0xc66de6c0) at /usr/src/sys/kern/subr_taskqueue.c:250
 #10 0xc06d062c in taskqueue_thread_loop (arg=0xc6752074) at /usr/src/sys/kern/subr_taskqueue.c:387
 #11 0xc0667857 in fork_exit (callout=0xc06d0570 <taskqueue_thread_loop>, arg=0xc6752074, frame=0xe857ad28)
     at /usr/src/sys/kern/kern_fork.c:876
 #12 0xc091db94 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:275
 
 
 once more trap:
 # kgdb kernel.debug /var/crash/vmcore.11
 GNU gdb 6.1.1 [FreeBSD]
 Copyright 2004 Free Software Foundation, Inc.
 GDB is free software, covered by the GNU General Public License, and you are
 welcome to change it and/or distribute copies of it under certain conditions.
 Type "show copying" to see the conditions.
 There is absolutely no warranty for GDB.  Type "show warranty" for details.
 This GDB was configured as "i386-marcel-freebsd"...
 
 Unread portion of the kernel message buffer:
 
 
 Fatal trap 12: page fault while in kernel mode
 cpuid = 0; apic id = 00
 fault virtual address   = 0xc7274908
 fault code              = supervisor read, page not present
 instruction pointer     = 0x20:0xc0c209df
 stack pointer           = 0x28:0xe857ac38
 frame pointer           = 0x28:0xe857ac64
 code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, def32 1, gran 1
 processor eflags        = interrupt enabled, resume, IOPL = 0
 current process         = 0 (run0 taskq)
 trap number             = 12
 panic: page fault
 cpuid = 0
 KDB: stack backtrace:
 #0 0xc06c4177 at kdb_backtrace+0x47
 #1 0xc06942e7 at panic+0x117
 #2 0xc0935d53 at trap_fatal+0x323
 #3 0xc0935fe0 at trap_pfault+0x280
 #4 0xc0936b23 at trap+0x443
 #5 0xc091db1c at calltrap+0x6
 #6 0xc0c234a5 at run_ratectl_cb+0x65
 #7 0xc06d049a at taskqueue_run_locked+0xca
 #8 0xc06d062c at taskqueue_thread_loop+0xbc
 #9 0xc0667857 at fork_exit+0x97
 #10 0xc091db94 at fork_trampoline+0x8
 Uptime: 34m29s
 Physical memory: 2027 MB
 Dumping 194 MB: 179 163 147 131 115 99 83 67 51 35 19 3
 
 Reading symbols from /boot/kernel/if_run.ko...Reading symbols from /boot/kernel/if_run.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/if_run.ko
 Reading symbols from /boot/kernel/wlan.ko...Reading symbols from /boot/kernel/wlan.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan.ko
 Reading symbols from /boot/modules/nvidia.ko...done.
 Loaded symbols for /boot/modules/nvidia.ko
 Reading symbols from /boot/kernel/linux.ko...Reading symbols from /boot/kernel/linux.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/linux.ko
 Reading symbols from /boot/kernel/runfw.ko...Reading symbols from /boot/kernel/runfw.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/runfw.ko
 Reading symbols from /boot/kernel/linprocfs.ko...Reading symbols from /boot/kernel/linprocfs.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/linprocfs.ko
 Reading symbols from /usr/local/libexec/linux_adobe/linux_adobe.ko...done.
 Loaded symbols for /usr/local/libexec/linux_adobe/linux_adobe.ko
 Reading symbols from /boot/kernel/blank_saver.ko...Reading symbols from /boot/kernel/blank_saver.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/blank_saver.ko
 Reading symbols from /boot/kernel/wlan_xauth.ko...Reading symbols from /boot/kernel/wlan_xauth.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_xauth.ko
 Reading symbols from /boot/kernel/wlan_wep.ko...Reading symbols from /boot/kernel/wlan_wep.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_wep.ko
 Reading symbols from /boot/kernel/wlan_tkip.ko...Reading symbols from /boot/kernel/wlan_tkip.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_tkip.ko
 Reading symbols from /boot/kernel/wlan_ccmp.ko...Reading symbols from /boot/kernel/wlan_ccmp.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_ccmp.ko
 #0  doadump () at pcpu.h:244
 244             __asm("movl %%fs:0,%0" : "=r" (td));
 (kgdb) backtrace
 #0  doadump () at pcpu.h:244
 #1  0xc0694083 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:441
 #2  0xc0694320 in panic (fmt=Variable "fmt" is not available.
 ) at /usr/src/sys/kern/kern_shutdown.c:614
 #3  0xc0935d53 in trap_fatal (frame=0xe857abf8, eva=3341240584) at /usr/src/sys/i386/i386/trap.c:981
 #4  0xc0935fe0 in trap_pfault (frame=0xe857abf8, usermode=0, eva=3341240584) at /usr/src/sys/i386/i386/trap.c:894
 #5  0xc0936b23 in trap (frame=0xe857abf8) at /usr/src/sys/i386/i386/trap.c:562
 #6  0xc091db1c in calltrap () at /usr/src/sys/i386/i386/exception.s:168
 #7  0xc0c209df in run_drain_fifo (arg=0xc6749000) at /usr/src/sys/modules/usb/run/../../../dev/usb/wlan/if_run.c:2251
 #8  0xc0c234a5 in run_ratectl_cb (arg=0xc6749000, pending=1)
     at /usr/src/sys/modules/usb/run/../../../dev/usb/wlan/if_run.c:2216
 #9  0xc06d049a in taskqueue_run_locked (queue=0xc66de400) at /usr/src/sys/kern/subr_taskqueue.c:250
 #10 0xc06d062c in taskqueue_thread_loop (arg=0xc6752074) at /usr/src/sys/kern/subr_taskqueue.c:387
 #11 0xc0667857 in fork_exit (callout=0xc06d0570 <taskqueue_thread_loop>, arg=0xc6752074, frame=0xe857ad28)
     at /usr/src/sys/kern/kern_fork.c:876
 #12 0xc091db94 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:275
 
 once more trap:
 # kgdb kernel.debug /var/crash/vmcore.10
 GNU gdb 6.1.1 [FreeBSD]
 Copyright 2004 Free Software Foundation, Inc.
 GDB is free software, covered by the GNU General Public License, and you are
 welcome to change it and/or distribute copies of it under certain conditions.
 Type "show copying" to see the conditions.
 There is absolutely no warranty for GDB.  Type "show warranty" for details.
 This GDB was configured as "i386-marcel-freebsd"...
 
 Unread portion of the kernel message buffer:
 
                         = DPL 0, pres 1, def32 1, gran 1
 processor eflags        = interrupt enabled, resume, IOPL = 0
 current process         = 0 (run0 taskq)
 trap number             = 12
 panic: page fault
 cpuid = 1
 KDB: stack backtrace:
 #0 0xc06c4177 at kdb_backtrace+0x47
 #1 0xc06942e7 at panic+0x117
 #2 0xc0935d53 at trap_fatal+0x323
 #3 0xc0935fe0 at trap_pfault+0x280
 #4 0xc0936b23 at trap+0x443
 #5 0xc091db1c at calltrap+0x6
 #6 0xc0c234a5 at run_ratectl_cb+0x65
 #7 0xc06d049a at taskqueue_run_locked+0xca
 #8 0xc06d062c at taskqueue_thread_loop+0xbc
 #9 0xc0667857 at fork_exit+0x97
 #10 0xc091db94 at fork_trampoline+0x8
 Uptime: 22h11m39s
 Physical memory: 2027 MB
 Dumping 291 MB: 276 260 244 228 212 196 180 164 148 132 116 100 84 68 52 36 20 4
 
 Reading symbols from /boot/kernel/if_run.ko...Reading symbols from /boot/kernel/if_run.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/if_run.ko
 Reading symbols from /boot/kernel/wlan.ko...Reading symbols from /boot/kernel/wlan.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan.ko
 Reading symbols from /boot/modules/nvidia.ko...done.
 Loaded symbols for /boot/modules/nvidia.ko
 Reading symbols from /boot/kernel/linux.ko...Reading symbols from /boot/kernel/linux.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/linux.ko
 Reading symbols from /boot/kernel/runfw.ko...Reading symbols from /boot/kernel/runfw.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/runfw.ko
 Reading symbols from /boot/kernel/linprocfs.ko...Reading symbols from /boot/kernel/linprocfs.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/linprocfs.ko
 Reading symbols from /usr/local/libexec/linux_adobe/linux_adobe.ko...done.
 Loaded symbols for /usr/local/libexec/linux_adobe/linux_adobe.ko
 Reading symbols from /boot/kernel/blank_saver.ko...Reading symbols from /boot/kernel/blank_saver.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/blank_saver.ko
 Reading symbols from /boot/kernel/wlan_xauth.ko...Reading symbols from /boot/kernel/wlan_xauth.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_xauth.ko
 Reading symbols from /boot/kernel/wlan_wep.ko...Reading symbols from /boot/kernel/wlan_wep.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_wep.ko
 Reading symbols from /boot/kernel/wlan_tkip.ko...Reading symbols from /boot/kernel/wlan_tkip.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_tkip.ko
 Reading symbols from /boot/kernel/wlan_ccmp.ko...Reading symbols from /boot/kernel/wlan_ccmp.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_ccmp.ko
 #0  doadump () at pcpu.h:244
 244             __asm("movl %%fs:0,%0" : "=r" (td));
 (kgdb) backtrace
 #0  doadump () at pcpu.h:244
 #1  0xc0694083 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:441
 #2  0xc0694320 in panic (fmt=Variable "fmt" is not available.
 ) at /usr/src/sys/kern/kern_shutdown.c:614
 #3  0xc0935d53 in trap_fatal (frame=0xe857abf8, eva=3354347784) at /usr/src/sys/i386/i386/trap.c:981
 #4  0xc0935fe0 in trap_pfault (frame=0xe857abf8, usermode=0, eva=3354347784) at /usr/src/sys/i386/i386/trap.c:894
 #5  0xc0936b23 in trap (frame=0xe857abf8) at /usr/src/sys/i386/i386/trap.c:562
 #6  0xc091db1c in calltrap () at /usr/src/sys/i386/i386/exception.s:168
 #7  0xc0c209df in run_drain_fifo (arg=0xc674b000) at /usr/src/sys/modules/usb/run/../../../dev/usb/wlan/if_run.c:2251
 #8  0xc0c234a5 in run_ratectl_cb (arg=0xc674b000, pending=1)
     at /usr/src/sys/modules/usb/run/../../../dev/usb/wlan/if_run.c:2216
 #9  0xc06d049a in taskqueue_run_locked (queue=0xc6707880) at /usr/src/sys/kern/subr_taskqueue.c:250
 #10 0xc06d062c in taskqueue_thread_loop (arg=0xc6754074) at /usr/src/sys/kern/subr_taskqueue.c:387
 #11 0xc0667857 in fork_exit (callout=0xc06d0570 <taskqueue_thread_loop>, arg=0xc6754074, frame=0xe857ad28)
     at /usr/src/sys/kern/kern_fork.c:876
 #12 0xc091db94 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:275
 
 once more trap:
 # kgdb kernel.debug /var/crash/vmcore.9
 GNU gdb 6.1.1 [FreeBSD]
 Copyright 2004 Free Software Foundation, Inc.
 GDB is free software, covered by the GNU General Public License, and you are
 welcome to change it and/or distribute copies of it under certain conditions.
 Type "show copying" to see the conditions.
 There is absolutely no warranty for GDB.  Type "show warranty" for details.
 This GDB was configured as "i386-marcel-freebsd"...
 
 Unread portion of the kernel message buffer:
 
 
 Fatal trap 12: page fault while in kernel mode
 cpuid = 0; apic id = 00
 fault virtual address   = 0xc85af908
 fault code              = supervisor read, page not present
 instruction pointer     = 0x20:0xc0c209df
 stack pointer           = 0x28:0xe857ac38
 frame pointer           = 0x28:0xe857ac64
 code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, def32 1, gran 1
 processor eflags        = interrupt enabled, resume, IOPL = 0
 current process         = 0 (run0 taskq)
 trap number             = 12
 panic: page fault
 cpuid = 0
 KDB: stack backtrace:
 #0 0xc06c4177 at kdb_backtrace+0x47
 #1 0xc06942e7 at panic+0x117
 #2 0xc0935d53 at trap_fatal+0x323
 #3 0xc0935fe0 at trap_pfault+0x280
 #4 0xc0936b23 at trap+0x443
 #5 0xc091db1c at calltrap+0x6
 #6 0xc0c234a5 at run_ratectl_cb+0x65
 #7 0xc06d049a at taskqueue_run_locked+0xca
 #8 0xc06d062c at taskqueue_thread_loop+0xbc
 #9 0xc0667857 at fork_exit+0x97
 #10 0xc091db94 at fork_trampoline+0x8
 Uptime: 8d0h22m13s
 Physical memory: 2027 MB
 Dumping 310 MB: 295 279 263 247 231 215 199 183 167 151 135 119 103 87 71 55 39 23 7
 
 Reading symbols from /boot/kernel/if_run.ko...Reading symbols from /boot/kernel/if_run.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/if_run.ko
 Reading symbols from /boot/kernel/wlan.ko...Reading symbols from /boot/kernel/wlan.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan.ko
 Reading symbols from /boot/modules/nvidia.ko...done.
 Loaded symbols for /boot/modules/nvidia.ko
 Reading symbols from /boot/kernel/linux.ko...Reading symbols from /boot/kernel/linux.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/linux.ko
 Reading symbols from /boot/kernel/runfw.ko...Reading symbols from /boot/kernel/runfw.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/runfw.ko
 Reading symbols from /boot/kernel/linprocfs.ko...Reading symbols from /boot/kernel/linprocfs.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/linprocfs.ko
 Reading symbols from /usr/local/libexec/linux_adobe/linux_adobe.ko...done.
 Loaded symbols for /usr/local/libexec/linux_adobe/linux_adobe.ko
 Reading symbols from /boot/kernel/blank_saver.ko...Reading symbols from /boot/kernel/blank_saver.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/blank_saver.ko
 Reading symbols from /boot/kernel/wlan_xauth.ko...Reading symbols from /boot/kernel/wlan_xauth.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_xauth.ko
 Reading symbols from /boot/kernel/wlan_wep.ko...Reading symbols from /boot/kernel/wlan_wep.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_wep.ko
 Reading symbols from /boot/kernel/wlan_tkip.ko...Reading symbols from /boot/kernel/wlan_tkip.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_tkip.ko
 Reading symbols from /boot/kernel/wlan_ccmp.ko...Reading symbols from /boot/kernel/wlan_ccmp.ko.symbols...done.
 done.
 Loaded symbols for /boot/kernel/wlan_ccmp.ko
 #0  doadump () at pcpu.h:244
 244             __asm("movl %%fs:0,%0" : "=r" (td));
 (kgdb) backtrace
 #0  doadump () at pcpu.h:244
 #1  0xc0694083 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:441
 #2  0xc0694320 in panic (fmt=Variable "fmt" is not available.
 ) at /usr/src/sys/kern/kern_shutdown.c:614
 #3  0xc0935d53 in trap_fatal (frame=0xe857abf8, eva=3361405192) at /usr/src/sys/i386/i386/trap.c:981
 #4  0xc0935fe0 in trap_pfault (frame=0xe857abf8, usermode=0, eva=3361405192) at /usr/src/sys/i386/i386/trap.c:894
 #5  0xc0936b23 in trap (frame=0xe857abf8) at /usr/src/sys/i386/i386/trap.c:562
 #6  0xc091db1c in calltrap () at /usr/src/sys/i386/i386/exception.s:168
 #7  0xc0c209df in run_drain_fifo (arg=0xc6749000) at /usr/src/sys/modules/usb/run/../../../dev/usb/wlan/if_run.c:2251
 #8  0xc0c234a5 in run_ratectl_cb (arg=0xc6749000, pending=1)
     at /usr/src/sys/modules/usb/run/../../../dev/usb/wlan/if_run.c:2216
 #9  0xc06d049a in taskqueue_run_locked (queue=0xc66de6c0) at /usr/src/sys/kern/subr_taskqueue.c:250
 #10 0xc06d062c in taskqueue_thread_loop (arg=0xc6752074) at /usr/src/sys/kern/subr_taskqueue.c:387
 #11 0xc0667857 in fork_exit (callout=0xc06d0570 <taskqueue_thread_loop>, arg=0xc6752074, frame=0xe857ad28)
     at /usr/src/sys/kern/kern_fork.c:876
 #12 0xc091db94 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:275
 
 
 >How-To-Repeat:
 Plug Asus USB-N11 device.
 Configure the system to use the device as a host AP.
 Wait indefinitely: sometimes a kernel panic occurs without any connection to the host AP.
 >Fix:
 
 
 >Release-Note:
 >Audit-Trail:
 >Unformatted:
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