kern/153514: CAM related panic

Oleg Nauman oleg.nauman at
Wed Dec 29 08:00:20 UTC 2010

>Number:         153514
>Category:       kern
>Synopsis:       CAM related panic
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Dec 29 08:00:19 UTC 2010
>Originator:     Oleg Nauman
>Release:        8.2-PRERELEASE
Private Person
FreeBSD 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #147: Mon Dec 27 18:43:38 EET 2010     root at  i386
My laptop experiencing the crash during detach builtin cardreader on my EVDO modem
Here is the backtrace from core.txt file: dumped core - see /var/crash/vmcore.9

Tue Dec 28 08:44:54 EET 2010

FreeBSD 8.2-PRERELEASE FreeBSD 8.2-PRERELEASE #147: Mon Dec 27 18:43:38 EET 2010     root at  i386

panic: page fault

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Unread portion of the kernel message buffer:
umass0: at uhub5, port 3, addr 2 (disconnected)
(probe0:umass-sim0:0:0:0): AutoSense failed
kernel trap 12 with interrupts disabled

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x14
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc0736482
stack pointer           = 0x28:0xc5225bd4
frame pointer           = 0x28:0xc5225bec
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = resume, IOPL = 0
current process         = 12 (swi2: cambio)
trap number             = 12
panic: page fault
cpuid = 0

KDB: stack backtrace:
#0 0xc072ac57 at kdb_backtrace+0x47
#1 0xc06ffe97 at panic+0x117
#2 0xc09a31f3 at trap_fatal+0x323
#3 0xc09a3602 at trap+0x152
#4 0xc098c87c at calltrap+0x6
#5 0xc06f25e9 at _mtx_unlock_sleep+0x49
#6 0xc06f2669 at _mtx_unlock_flags+0x49
#7 0xc0473bb0 at camisr+0x110
#8 0xc06de98c at intr_event_execute_handlers+0x14c
#9 0xc06df77e at ithread_loop+0xbe
#10 0xc06dccde at fork_exit+0xee
#11 0xc098c8f4 at fork_trampoline+0x8
Uptime: 6m55s
Physical memory: 2027 MB
Dumping 121 MB: 106 90 74 58 42 26 10

Reading symbols from /boot/modules/bwn_v4_ucode.ko...Reading symbols from /boot/modules/bwn_v4_ucode.ko.symbols...done.
Loaded symbols for /boot/modules/bwn_v4_ucode.ko
Reading symbols from /boot/modules/cuse4bsd.ko...done.
Loaded symbols for /boot/modules/cuse4bsd.ko
#0  doadump () at pcpu.h:231
231     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump () at pcpu.h:231
#1  0xc06ffc93 in boot (howto=260) at ../../../kern/kern_shutdown.c:419
#2  0xc06ffed0 in panic (fmt=Variable "fmt" is not available.
) at ../../../kern/kern_shutdown.c:592
#3  0xc09a31f3 in trap_fatal (frame=0xc5225b94, eva=20)
    at ../../../i386/i386/trap.c:946
#4  0xc09a3602 in trap (frame=0xc5225b94) at ../../../i386/i386/trap.c:326
#5  0xc098c87c in calltrap () at ../../../i386/i386/exception.s:166
#6  0xc0736482 in turnstile_broadcast (ts=0x0, queue=0)
    at ../../../kern/subr_turnstile.c:831
#7  0xc06f25e9 in _mtx_unlock_sleep (m=0xc67e170c, opts=0, 

    file=0xc0a04b40 "../../../cam/cam_xpt.c", line=4715)
    at ../../../kern/kern_mutex.c:675
#8  0xc06f2669 in _mtx_unlock_flags (m=0xc67e170c, opts=0, 
    file=0xc0a04b40 "../../../cam/cam_xpt.c", line=4715)
    at ../../../kern/kern_mutex.c:227
#9  0xc0473bb0 in camisr (dummy=0x0) at ../../../cam/cam_xpt.c:4715
#10 0xc06de98c in intr_event_execute_handlers (p=0xc556f7f8, ie=0xc56a8800)
    at ../../../kern/kern_intr.c:1220
#11 0xc06df77e in ithread_loop (arg=0xc556e2b0)
    at ../../../kern/kern_intr.c:1233
#12 0xc06dccde in fork_exit (callout=0xc06df6c0 <ithread_loop>, 
    arg=0xc556e2b0, frame=0xc5225d28) at ../../../kern/kern_fork.c:845
#13 0xc098c8f4 in fork_trampoline () at ../../../i386/i386/exception.s:273

My laptop is running the fresh RELENG_8 world

My EVDO modem is strange a bit - USB subsystem attaching and detaching it repeatedly. After few cycles of attach/detach I got the CAM related panic 

Not yet known to me


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