Messages in this thread | | | Date | Tue, 11 Apr 2006 21:01:14 +0530 | From | Rachita Kothiyal <> | Subject | Re: [RFC] Patch to fix cdrom being confused on using kdump |
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On Sun, Apr 09, 2006 at 12:29:42PM +0200, Jens Axboe wrote: > On Fri, Apr 07 2006, Rachita Kothiyal wrote: > > if (stat & DRQ_STAT) > > checking for DRQ_STAT again doesn't make sense, how can it ever be > anything but DRQ_STAT if DRQ_STAT is set?
Hi Jens,
Yes, you are right. The condition itself is redundant there as DRQ will always be set there. I will remove it.
> > > + /* DRQ is set. Interrupt not welcome now. Ignore */ > > + HWIF(drive)->OUTB((stat & 0xEF), IDE_STATUS_REG); > > + return ide_stopped; > > And this looks very wrong, you can't write to the status register. Well > you can, but then it's the command register! Writing stat & 0xef to the > command register is an odd thing to do. I think you just want to clear > the DRQ bit, which should be fine after it was read initially. How about > > > if (stat & DRQ_STAT) > return ide_stopped; > > Can you test that?
I tested this, but I see it fail a couple of times...sometimes it hung while booting up the second kernel and sometimes the kernel paniced while shutting it down.(attached partial log for panic)
I see your point that writing to the status register is not a good idea. I think what we want to do is just ignore this particular interrupt and let it continue. Am not sure if clearing DRQ bit will achieve this. Please correct me if I am wrong, but to clear the DRQ bit also we will have to write to the status register.
Thanks Rachita Shutting down powersaved done Saving random seed done Umount SMB/ CIFS File Systems done Shutting down ldap-server done Shutting down SSH daemon done Remove Net File System (NFS) unused Shutting down RPC portmap daemon done Shutting down syslog services done Shutting down network interfaces: cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 cdrom: entering cdrom_release cdrom: Use count for "/dev/hda" now zero cdrom: hda: No DVD+RW cdrom: Unlocking door! ide0: start_request: current=0xffff810003bfbca8 cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 cdrom: entering cdrom_release cdrom: Use count for "/dev/hda" now zero cdrom: hda: No DVD+RW cdrom: Unlocking door! ide0: start_request: current=0xffff810003bfbca8 cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 cdrom: entering cdrom_release cdrom: Use count for "/dev/hda" now zero cdrom: hda: No DVD+RW cdrom: Unlocking door! ide0: start_request: current=0xffff810003bfbca8 cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 cdrom: entering cdrom_release cdrom: Use count for "/dev/hda" now zero cdrom: hda: No DVD+RW cdrom: Unlocking door! ide0: start_request: current=0xffff810003bfbca8 cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 cdrom: entering cdrom_release cdrom: Use count for "/dev/hda" now zero cdrom: hda: No DVD+RW cdrom: Unlocking door! ide0: start_request: current=0xffff810003bfbca8 cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 cdrom: entering cdrom_release cdrom: Use count for "/dev/hda" now zero cdrom: hda: No DVD+RW cdrom: Unlocking door! ide0: start_request: current=0xffff810003bfbca8 cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 cdrom: entering cdrom_release cdrom: Use count for "/dev/hda" now zero cdrom: hda: No DVD+RW cdrom: Unlocking door! ide0: start_request: current=0xffff810003bfbca8 cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 cdrom: entering cdrom_release cdrom: Use count for "/dev/hda" now zero cdrom: hda: No DVD+RW cdrom: Unlocking door! ide0: start_request: current=0xffff810003bfbca8 cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 cdrom: entering cdrom_release cdrom: Use count for "/dev/hda" now zero cdrom: hda: No DVD+RW cdrom: Unlocking door! ide0: start_request: current=0xffff810003bfbca8 cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 cdrom: entering cdrom_release cdrom: Use count for "/dev/hda" now zero cdrom: hda: No DVD+RW cdrom: Unlocking door! ide0: start_request: current=0xffff810003bfbca8 cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 cdrom: entering cdrom_release cdrom: Use count for "/dev/hda" now zero cdrom: hda: No DVD+RW cdrom: Unlocking door! ide0: start_request: current=0xffff810003bfbca8 cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 cdrom: entering cdrom_release cdrom: Use count for "/dev/hda" now zero cdrom: hda: No DVD+RW cdrom: Unlocking door! ide0: start_request: current=0xffff810003bfbca8 cdrom: entering cdrom_open cdrom: Use count for "/dev/hda" now 1 ide0: start_request: current=0xffff810003bfbaa8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba18 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfba08 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfb9f8 ide0: start_request: current=0xffff810004c222d8 cdrom: entering CDROM_DRIVE_STATUS ide0: start_request: current=0xffff810003bfbbb8 ide0: start_request: current=0xffff810004c222d8 ide0: start_request: current=0xffff810003bfbb58 Rachita: DRQ set.Interrupt ignored BUG: spinlock recursion on CPU#0, hald-addon-stor/2018 lock: ffffffff812c1128, .magic: dead4ead, .owner: hald-addon-stor/2018, .owner_cpu: 0
Call Trace: <IRQ> <ffffffff810cf6e9>{_raw_spin_lock+61} <ffffffff81042b08>{__do_IRQ+55} <ffffffff8100c3cb>{do_IRQ+59} <ffffffff8100aa24>{ret_from_intr+0} <ffffffff880052cf>{:ide_core:ide_do_request+820} <ffffffff880052ca>{:ide_core:ide_do_request+815} <ffffffff8118e7d1>{_spin_lock_irqsave+9} <ffffffff88161c58>{:ide_cd:cdrom_decode_status+42} <ffffffff881626ca>{:ide_cd:cdrom_pc_intr+510} <ffffffff88005abd>{:ide_core:ide_intr+442} <ffffffff810431a8>{note_interrupt+219} <ffffffff81042b7e>{__do_IRQ+173} <ffffffff8100c3cb>{do_IRQ+59} <ffffffff8100aa24>{ret_from_intr+0} <EOI> <ffffffff8102743a>{vprintk+652} <ffffffff88006233>{:ide_core:ide_outsw+0} <ffffffff88006238>{:ide_core:ide_outsw+5} <ffffffff88006681>{:ide_core:atapi_output_bytes+38} <ffffffff881624cc>{:ide_cd:cdrom_pc_intr+0} <ffffffff88162b5b>{:ide_cd:cdrom_transfer_packet_command+182} <ffffffff88162bda>{:ide_cd:cdrom_do_pc_continuation+0} <ffffffff8815f91a>{:ide_cd:cdrom_start_packet_command+359} <ffffffff880055d2>{:ide_core:ide_do_request+1591} <ffffffff8118d1e4>{thread_return+0} <ffffffff8118d23a>{thread_return+86} <ffffffff8800574d>{:ide_core:ide_do_request+1970} <ffffffff810bd928>{elv_insert+120} <ffffffff880058a5>{:ide_core:ide_do_drive_cmd+245} <ffffffff881603a7>{:ide_cd:cdrom_queue_packet_command+70} <ffffffff810bf79a>{blk_end_sync_rq+0} <ffffffff880045f8>{:ide_core:ide_init_drive_cmd+16} <ffffffff881604de>{:ide_cd:ide_cdrom_packet+155} <ffffffff810bf79a>{blk_end_sync_rq+0} <ffffffff8814b7ea>{:cdrom:cdrom_get_media_event+77} <ffffffff88160b22>{:ide_cd:ide_cdrom_drive_status+65} <ffffffff8814b266>{:cdrom:cdrom_ioctl+1640} <ffffffff810ca406>{kobject_get+18} <ffffffff810c2747>{get_disk+47} <ffffffff810c21a3>{blkdev_ioctl+1558} <ffffffff81068f83>{do_open+221} <ffffffff81068e9e>{bdget+284} <ffffffff81068896>{bd_claim+131} <ffffffff810693ea>{blkdev_open+0} <ffffffff81069422>{blkdev_open+56} <ffffffff810608af>{__dentry_open+238} <ffffffff81068967>{block_ioctl+27} <ffffffff81072713>{do_ioctl+27} <ffffffff81072957>{vfs_ioctl+527} <ffffffff810729a5>{sys_ioctl+60} <ffffffff8100a47e>{system_call+126} NMI Watchdog detected LOCKUP on CPU 0 CPU 0 Modules linked in: edd ipv6 loop dm_mod usbhid tg3 generic ide_cd shpchp cdrom pci_hotplug uhci_hcd ehci_hcd e752x_edac floppy usbcore edac_mc ext3 jbd processor sg aic79xx scsi_transport_spi piix sd_mod scsi_mod ide_disk ide_core Pid: 2018, comm: hald-addon-stor Tainted: G U 2.6.16-rc2-git5-rachita-3-kdump #6 RIP: 0010:[<ffffffff810ce62b>] <ffffffff810ce62b>{__delay+2} RSP: 0018:ffffffff8124b8a8 EFLAGS: 00000006 RAX: 00000000b395caba RBX: ffffffff812c1128 RCX: 00000000b395c9c7 RDX: 0000000000000205 RSI: ffffffff811b4fad RDI: 0000000000000001 RBP: 000000001bb47288 R08: 0000000000000007 R09: ffffffff8124b4f0 R10: ffffffff88164154 R11: 0000000000000000 R12: 0000000000000001 R13: ffffffff812c1128 R14: ffff810004af4488 R15: ffffffff8124b908 FS: 00002b44cadc36d0(0000) GS:ffffffff812c1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00002b752a9f8280 CR3: 0000000002d42000 CR4: 00000000000006e0 Process hald-addon-stor (pid: 2018, threadinfo ffff810003bfa000, task ffff81000446e040) Stack: ffffffff810cf72d 0000000000000000 ffffffff812c1100 0000000000000000 ffffffff81042b08 ffff810004b71c10 ffffffff8124b908 0000000000000000 ffff810004af4488 ffffffff8801d220 Call Trace: <IRQ> <ffffffff810cf72d>{_raw_spin_lock+129} <ffffffff81042b08>{__do_IRQ+55} <ffffffff8100c3cb>{do_IRQ+59} <ffffffff8100aa24>{ret_from_intr+0} <ffffffff880052cf>{:ide_core:ide_do_request+820} <ffffffff880052ca>{:ide_core:ide_do_request+815} <ffffffff8118e7d1>{_spin_lock_irqsave+9} <ffffffff88161c58>{:ide_cd:cdrom_decode_status+42} <ffffffff881626ca>{:ide_cd:cdrom_pc_intr+510} <ffffffff88005abd>{:ide_core:ide_intr+442} <ffffffff810431a8>{note_interrupt+219} <ffffffff81042b7e>{__do_IRQ+173} <ffffffff8100c3cb>{do_IRQ+59} <ffffffff8100aa24>{ret_from_intr+0} <EOI> <ffffffff8102743a>{vprintk+652} <ffffffff88006233>{:ide_core:ide_outsw+0} <ffffffff88006238>{:ide_core:ide_outsw+5} <ffffffff88006681>{:ide_core:atapi_output_bytes+38} <ffffffff881624cc>{:ide_cd:cdrom_pc_intr+0} <ffffffff88162b5b>{:ide_cd:cdrom_transfer_packet_command+182} <ffffffff88162bda>{:ide_cd:cdrom_do_pc_continuation+0} <ffffffff8815f91a>{:ide_cd:cdrom_start_packet_command+359} <ffffffff880055d2>{:ide_core:ide_do_request+1591} <ffffffff8118d1e4>{thread_return+0} <ffffffff8118d23a>{thread_return+86} <ffffffff8800574d>{:ide_core:ide_do_request+1970} <ffffffff810bd928>{elv_insert+120} <ffffffff880058a5>{:ide_core:ide_do_drive_cmd+245} <ffffffff881603a7>{:ide_cd:cdrom_queue_packet_command+70} <ffffffff810bf79a>{blk_end_sync_rq+0} <ffffffff880045f8>{:ide_core:ide_init_drive_cmd+16} <ffffffff881604de>{:ide_cd:ide_cdrom_packet+155} <ffffffff810bf79a>{blk_end_sync_rq+0} <ffffffff8814b7ea>{:cdrom:cdrom_get_media_event+77} <ffffffff88160b22>{:ide_cd:ide_cdrom_drive_status+65} <ffffffff8814b266>{:cdrom:cdrom_ioctl+1640} <ffffffff810ca406>{kobject_get+18} <ffffffff810c2747>{get_disk+47} <ffffffff810c21a3>{blkdev_ioctl+1558} <ffffffff81068f83>{do_open+221} <ffffffff81068e9e>{bdget+284} <ffffffff81068896>{bd_claim+131} <ffffffff810693ea>{blkdev_open+0} <ffffffff81069422>{blkdev_open+56} <ffffffff810608af>{__dentry_open+238} <ffffffff81068967>{block_ioctl+27} <ffffffff81072713>{do_ioctl+27} <ffffffff81072957>{vfs_ioctl+527} <ffffffff810729a5>{sys_ioctl+60} <ffffffff8100a47e>{system_call+126}
Code: 89 c1 f3 90 0f 31 29 c8 48 39 f8 72 f5 c3 48 69 05 cc a4 1f console shuts up ... <3>Debug: sleeping function called from invalid context at include/linux/rwsem.h:43 in_atomic():1, irqs_disabled():1
Call Trace: <NMI> <ffffffff81027e14>{profile_task_exit+21} <ffffffff810299e0>{do_exit+32} <ffffffff8118ede7>{__die+0} <ffffffff8118f4d5>{nmi_watchdog_tick+161} <ffffffff8118f2d1>{default_do_nmi+115} <ffffffff8118f58b>{do_nmi+61} <ffffffff8118eb87>{nmi+127} <ffffffff810ce62b>{__delay+2} <EOE> <IRQ> <ffffffff810cf72d>{_raw_spin_lock+129} <ffffffff81042b08>{__do_IRQ+55} <ffffffff8100c3cb>{do_IRQ+59} <ffffffff8100aa24>{ret_from_intr+0} <ffffffff880052cf>{:ide_core:ide_do_request+820} <ffffffff880052ca>{:ide_core:ide_do_request+815} <ffffffff8118e7d1>{_spin_lock_irqsave+9} <ffffffff88161c58>{:ide_cd:cdrom_decode_status+42} <ffffffff881626ca>{:ide_cd:cdrom_pc_intr+510} <ffffffff88005abd>{:ide_core:ide_intr+442} <ffffffff810431a8>{note_interrupt+219} <ffffffff81042b7e>{__do_IRQ+173} <ffffffff8100c3cb>{do_IRQ+59} <ffffffff8100aa24>{ret_from_intr+0} <EOI> <ffffffff8102743a>{vprintk+652} <ffffffff88006233>{:ide_core:ide_outsw+0} <ffffffff88006238>{:ide_core:ide_outsw+5} <ffffffff88006681>{:ide_core:atapi_output_bytes+38} <ffffffff881624cc>{:ide_cd:cdrom_pc_intr+0} <ffffffff88162b5b>{:ide_cd:cdrom_transfer_packet_command+182} <ffffffff88162bda>{:ide_cd:cdrom_do_pc_continuation+0} <ffffffff8815f91a>{:ide_cd:cdrom_start_packet_command+359} <ffffffff880055d2>{:ide_core:ide_do_request+1591} <ffffffff8118d1e4>{thread_return+0} <ffffffff8118d23a>{thread_return+86} <ffffffff8800574d>{:ide_core:ide_do_request+1970} <ffffffff810bd928>{elv_insert+120} <ffffffff880058a5>{:ide_core:ide_do_drive_cmd+245} <ffffffff881603a7>{:ide_cd:cdrom_queue_packet_command+70} <ffffffff810bf79a>{blk_end_sync_rq+0} <ffffffff880045f8>{:ide_core:ide_init_drive_cmd+16} <ffffffff881604de>{:ide_cd:ide_cdrom_packet+155} <ffffffff810bf79a>{blk_end_sync_rq+0} <ffffffff8814b7ea>{:cdrom:cdrom_get_media_event+77} <ffffffff88160b22>{:ide_cd:ide_cdrom_drive_status+65} <ffffffff8814b266>{:cdrom:cdrom_ioctl+1640} <ffffffff810ca406>{kobject_get+18} <ffffffff810c2747>{get_disk+47} <ffffffff810c21a3>{blkdev_ioctl+1558} <ffffffff81068f83>{do_open+221} <ffffffff81068e9e>{bdget+284} <ffffffff81068896>{bd_claim+131} <ffffffff810693ea>{blkdev_open+0} <ffffffff81069422>{blkdev_open+56} <ffffffff810608af>{__dentry_open+238} <ffffffff81068967>{block_ioctl+27} <ffffffff81072713>{do_ioctl+27} <ffffffff81072957>{vfs_ioctl+527} <ffffffff810729a5>{sys_ioctl+60} <ffffffff8100a47e>{system_call+126} Kernel panic - not syncing: Aiee, killing interrupt handler!
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