Removing an SDHC card causes a kernel panic on -current

[Benjamin Kaduk]

On Tue, 26 Jun 2012, Michael Butler wrote:

> As follows, in "g_disk_providergone", a NULL pointer reference?:

g_disk_providergone() is new in r237518 (by ken); ken cc'd.

-Ben Kaduk

>
> imb at toshi:/home/imb> sudo less /var/crash/core.txt.4
> toshi.auburn.protected-networks.net dumped core - see /var/crash/vmcore.4
>
> Tue Jun 26 08:59:01 EDT 2012
>
> FreeBSD toshi.auburn.protected-networks.net 10.0-CURRENT FreeBSD
> 10.0-CURRENT #12 r237599M: Tue Jun 26 07:52:01 EDT 2012
> imb at toshi.auburn.protected-networks.net:/usr/obj/usr/home/imb/svn/head/sys/TOSHI
> i386
>
> panic: page fault
>
> [ .. ]
>
> Unread portion of the kernel message buffer:
> sdhci0-slot0: Card removed
> mmc0: detached
>
> Fatal trap 12: page fault while in kernel mode
> cpuid = 1; apic id = 01
> fault virtual address   = 0x0
> fault code              = supervisor read, page not present
> instruction pointer     = 0x20:0xc070a4bc
> stack pointer           = 0x28:0xc6fb7c54
> frame pointer           = 0x28:0xc6fb7c54
> 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         = 14 (g_event)
> trap number             = 12
> panic: page fault
> cpuid = 1
> Uptime: 7m8s
> Physical memory: 3045 MB
> Dumping 265 MB: 250 234 218 202 186 170 154 138 122 106 90 74 58 42 26 10
>
> Reading symbols from /boot/kernel/drm.ko...Reading symbols from
> /boot/kernel/drm.ko.symbols...done.
> done.
> Loaded symbols for /boot/kernel/drm.ko
> Reading symbols from /boot/kernel/i915.ko...Reading symbols from
> /boot/kernel/i915.ko.symbols...done.
> done.
> Loaded symbols for /boot/kernel/i915.ko
> Reading symbols from /boot/modules/vboxdrv.ko...done.
> Loaded symbols for /boot/modules/vboxdrv.ko
> Reading symbols from /boot/modules/cuse4bsd.ko...done.
> Loaded symbols for /boot/modules/cuse4bsd.ko
> Reading symbols from /boot/modules/vboxnetflt.ko...done.
> Loaded symbols for /boot/modules/vboxnetflt.ko
> Reading symbols from /boot/modules/vboxnetadp.ko...done.
> Loaded symbols for /boot/modules/vboxnetadp.ko
> Reading symbols from /usr/local/modules/fuse.ko...done.
> Loaded symbols for /usr/local/modules/fuse.ko
> #0  doadump (textdump=1) at pcpu.h:244
> 244     pcpu.h: No such file or directory.
>        in pcpu.h
> (kgdb) #0  doadump (textdump=1) at pcpu.h:244
> #1  0xc07ae76c in kern_reboot (howto=260)
>    at /usr/home/imb/svn/head/sys/kern/kern_shutdown.c:449
> #2  0xc07aee41 in panic (fmt=0x104 <Address 0x104 out of bounds>)
>    at /usr/home/imb/svn/head/sys/kern/kern_shutdown.c:637
> #3  0xc0af13d1 in trap_fatal (frame=0xc6fb7c14, eva=40)
>    at /usr/home/imb/svn/head/sys/i386/i386/trap.c:1022
> #4  0xc0af16a8 in trap_pfault (frame=0xc6fb7c14, usermode=0, eva=0)
>    at /usr/home/imb/svn/head/sys/i386/i386/trap.c:936
> #5  0xc0af29ef in trap (frame=0xc6fb7c14)
>    at /usr/home/imb/svn/head/sys/i386/i386/trap.c:546
> #6  0xc0adcbdc in calltrap ()
>    at /usr/home/imb/svn/head/sys/i386/i386/exception.s:169
> #7  0xc070a4bc in g_disk_providergone (pp=0xcb33ab80)
>    at /usr/home/imb/svn/head/sys/geom/geom_disk.c:505
> #8  0xc070f8ba in g_destroy_provider (pp=0xcb33ab80)
>    at /usr/home/imb/svn/head/sys/geom/geom_subr.c:643
> #9  0xc070fb6e in g_wither_washer ()
>    at /usr/home/imb/svn/head/sys/geom/geom_subr.c:462
> #10 0xc070cb62 in g_run_events ()
>    at /usr/home/imb/svn/head/sys/geom/geom_event.c:289
> #11 0xc077bd8b in fork_exit (callout=0xc070de54 <g_event_procbody>,
> arg=0x0,
>    frame=0xc6fb7d08) at /usr/home/imb/svn/head/sys/kern/kern_fork.c:995
> #12 0xc0adcc84 in fork_trampoline ()
>    at /usr/home/imb/svn/head/sys/i386/i386/exception.s:276
> (kgdb)
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