ATA/Cdrom(?) panic

[Ivan Voras]

On 16/11/2011 07:43, Bjoern A. Zeeb wrote:
> Hey,
> 
> we have seen this or a very similar panic for about 1 year now once in
> a while and I think I reported it before; this is FreeBSD as guest on

Yes, IIRC I've also reported it before; it crashes randomly, when the
machine is not doing anything with the cdrom. As a workaround, I now
remove the cdrom device from vmware instances.


> vmware.   Seems it was a double panic this time.   Could someone please
> see what's going on there?    It was on 8.x-STABLE in the past and this
> is 8.2-RELEASE-p4.
> 
> Thanks
> /bz
> 
> acd0: WARNING - READ_TOC taskqueue timeout - completing request directly
> 
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 4; apic id = 04
> fault virtual address   = 0x1f4
> fault code              = supervisor read, page not present
> instruction pointer     = 0x20:0xc08a1e9f
> 
> stack pointer           = 0x28:0xe6ad5b9c
> Fatal trap 12: page fault while in kernel mode
> frame pointer           = 0x28:0xe6ad5bb4
> cpuid = 2;
> code segment            = base 0x0, limit 0xfffff, type 0x1bapic id = 02
>                         = DPL 0, pres 1, def32 1, gran 1
> fault virtual address   = 0x1f4
> processor eflags        =
> fault code              = supervisor read, page not presentinterrupt
> enabled,
> instruction pointer     = 0x20:0xc08a1e9fresume,
> stack pointer           = 0x28:0xe8e9e808IOPL = 0
> frame pointer           = 0x28:0xe8e9e820
> current process         =
> code segment            = base 0x0, limit 0xfffff, type 0x1b12 (swi6:
> task queue)
>                         = DPL 0, pres 1, def32 1, gran 1
> trap number             = 12
> processor eflags        = interrupt enabled,
> panic: page faultresume,
> cpuid = 4IOPL = 0
> current process         =
> KDB: stack backtrace:25162 (bsnmpd)
> 
> trap number             = 12#0 0xc08e0d07 at kdb_backtrace+0x47
> 
> #1 0xc08b1dc7 at panic+0x117
> #2 0xc0be4b53 at trap_fatal+0x323
> #3 0xc0be4dd0 at trap_pfault+0x270
> #4 0xc0be5315 at trap+0x465
> #5 0xc0bcbecc at calltrap+0x6
> #6 0xc08b0d86 at _sema_post+0x46
> #7 0xc056fa47 at ata_completed+0x727
> #8 0xc08eb97a at taskqueue_run_locked+0xca
> #9 0xc08ebc8a at taskqueue_run+0xaa
> #10 0xc08ebd53 at taskqueue_swi_run+0x13
> #11 0xc088903b at intr_event_execute_handlers+0x13b
> #12 0xc088a75b at ithread_loop+0x6b
> #13 0xc0886d51 at fork_exit+0x91
> #14 0xc0bcbf44 at fork_trampoline+0x8
> Uptime: 5d20h1m56s
> 
> 
> (gdb) l *ata_completed+0x727
> 489             (request->callback)(request);
> 490         else
> 491             sema_post(&request->done);
> 492
> 493         /* only call ata_start if channel is present */
> 494         if (ch)
> 495             ata_start(ch->dev);
> 496     }
> 497
> 498     void
> 
> 

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