kern/150186: [parallels] [panic] Parallels Desktop: CDROM disconnected leads to panic, eventually

[Li-Lun Wang (Leland Wang)]

The following reply was made to PR kern/150186; it has been noted by GNATS.

From: "Li-Lun Wang (Leland Wang)" <llwang at infor.org>
To: bug-followup at FreeBSD.org, dave.evans55 at googlemail.com
Cc:  
Subject: Re: kern/150186: [parallels] [panic] Parallels Desktop: CDROM
 disconnected leads to panic, eventually
Date: Fri, 17 Dec 2010 03:13:51 +0800

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 Hi,
 
 I think I may have stumbled upon the same issue after I updated my
 installed ports, including hald.  I run a FreeBSD 8.1-stable amd64 (not
 the latest but a few months old) in virtual box on a windows 7 x64
 host.  If I disable hald or the cdrom device in virtual box, or run the
 same FreeBSD installation natively, the problem doesn't seem to occur.
 When the problem does occur, I get the following messages (not
 necessarily in any particular order):
 
 ata0: WARNING - unknown CMD (0x4a) read data overrun 18>8
 ata0: WARNING - READ_TOC read data overrun 18>12
 ata0: WARNING - PREVENT_ALLOW read data overrun 18>0
 ata0: WARNING - TEST_UNIT_READY read data overrun 18>0
 
 These messages repeat seemingly at random for a few times.  Eventually
 the box might panic.  Here is a backtrace:
 
 Fatal trap 12: page fault while in kernel mode
 cpuid = 0; apic id = 00
 fault virtual address	= 0x290
 fault code		= supervisor read data, page not present
 instruction pointer	= 0x20:0xffffffff8025aec5
 stack pointer		= 0x28:0xffffff800007bae0
 frame pointer		= 0x28:0xffffff800007bb00
 code segment		= base 0x0, limit 0xfffff, type 0x1b
 			= DPL 0, pres 1, long 1, def32 0, gran 1
 processor eflags	= interrupt enabled, resume, IOPL=0
 current process		= 11 (swi6: task queue)
 [thread pid 11 tid 100018 ]
 Stopped at	_mtx_lock_sleep+0x4e:	movl	0x290(%rcx),%esi
 db> bt
 Tracing pid 11 tid 100018 td 0xffffff00024bcba0
 _mtx_lock_sleep() at _mtx_lock_sleep+0x4e
 _sema_post() at _sema_post+0x89
 ata_completed() at ata_completed+0x46e
 taskqueue_run() at taskqueue_run+0x94
 intr_event_execute_handlers() at intr_event_execute_handlers+0xf9
 ithread_loop() at ithread_loop+0x8e
 fork_exit() at fork_exit+0x118
 fork_trampoline() at fork_trampoline+0xe
 - --- trap 0, rip = 0, rsp = 0xffffff800007bd30, rdp = 0 ---
 db>
 
 - -- llwang
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