Kernel panic while mounting a CD-ROM drive

["J. L. Lee" <jllee@singnet.com.sg>]

Hi,

I set up my B2000 (with PCI Matrox Millennum II card) to run on kernel
2.6.11-rc6-pa1 a few days ago and was able to mount the CD-ROM drive and
used it on several occassions. However it kept on causing kernel panic
and froze the B2000 whenever I tried to mount the CD-ROM drive since
today. 

The difference then and now (since I last used the CD-ROM drive) is that
I have installed successfully a X Windows package. Could this be the
reason? I have tried both init level 2 & 3 but this did not make a
difference. Any idea what went wrong?

(Please read pps below for the kernel panic messages.)

Rgds,
Lee

ps. Last few lines of the start-up messages before login prompt showing
what components of X Windows is running:

Initializing random number generator...done.
Setting up X server socket directory /tmp/.X11-unix...done.
Setting up ICE socket directory /tmp/.ICE-unix...done.
INIT: Entering runlevel: 3
Starting system log daemon: syslogd.
Starting kernel log daemon: klogd.
Starting portmap daemon: portmap.
Starting internet superserver: inetd.
Setting up X font server socket directory /tmp/.font-unix...done.
Starting X font server: xfs.
Starting X-TT font server: xfs-xtt.
Starting Xprint servers: Xprt.
Starting file alteration monitor: FAM.
Starting periodic command scheduler: cron.
Not starting WINGs display manager (wdm); it is not the default display
manager.
Not starting X display manager (xdm); it is not the default display
manager.

Debian GNU/Linux 3.1 DebianHPPA.example.com ttyS0

DebianHPPA.example.com login:


pps. Kernel panic messages immediately after I issued "mount"
command:

mount /dev/hda /media/cdrom0
Backtrace:

 [<10158408>] __blk_queue_bounce+0x1fc/0x294

 [<10278774>] __make_request+0x74/0x4e8

 [<10279050>] generic_make_request+0x1a8/0x26c

 [<10279184>] submit_bio+0x70/0x120

 [<10171a10>] submit_bh+0x148/0x1ac

 [<101705e8>] block_read_full_page+0x220/0x338

 [<1015125c>] read_pages+0x16c/0x1d8

 [<101513d4>] __do_page_cache_readahead+0x10c/0x190

 [<1015160c>]
blockable_page_cache_readahead+0x68/0xe0

 [<101518c4>] page_cache_readahead+0x18c/0x1ac

 [<1014a050>] do_generic_mapping_read+0x6c0/0x6c8

 [<1014a374>] __generic_file_aio_read+0x1b0/0x1c8

 [<1014a494>] generic_file_read+0x90/0xb8

 [<1016c210>] vfs_read+0xe0/0x158

 [<1016c52c>] sys_read+0x58/0xa8

 [<1010d12c>] syscall_exit+0x0/0x14



Kernel Fault: Code=26 regs=1ba94a40 (Addr=0000000c)


     YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI

PSW: 00000000000001101110111100001111 Not tainted

r00-03  00000000 103a7010 10158408 00011210

r04-07  00011200 00000000 00000000 1f44d140

r08-11  1ba94898 00000000 1f76c370 1049f010

r12-15  00000000 10000000 1049f010 10000000

r16-19  1049f010 10175040 1fff2420 1013ed60

r20-23  1ba949d4 ffffffaf 1ba949d4 00000000

r24-27  00000000 00000010 00011200 1038d010

r28-31  1f44d140 00052045 1ba94a40 1014d1ac

sr0-3   00000000 00000000 00000000 00000028

sr4-7   00000000 00000000 00000000 00000000


IASQ: 00000000 00000000 IAOQ: 1014d19c 1014d1a0

 IIR: 0cb81099    ISR: 00000000  IOR:
0000000c

 CPU:        0   CR30:
1ba94000 CR31: 10428000

 ORIG_R28: ea3dad4f

 IAOQ[0]: mempool_alloc+0x9c/0x144

 IAOQ[1]: mempool_alloc+0xa0/0x144

 RP(r2): __blk_queue_bounce+0x1fc/0x294

Kernel panic - not syncing: Kernel Fault