Re: Kernel Oops with 2.6.15

[Albert Lee <albertcc@tw.ibm.com>]

Ralf Müller wrote:
> The kernel oops reported for 2.6.15-rc7 when calling hddtemp on a sata
> drive which is in standby mode is still present in 2.6.15. Maybe someone
> is interested.
> 
> Regards
> Ralf
> 

Hi Ralf,

It looks like the command is running in PIO polling thread.
The timeout handler is called and the qc is cleared.
So, the PIO polling thread got NULL qc.

Could you post more trace before the timeout occurs, thanks,

Albert


> Jan  3 15:21:35 DatenGrab kernel: ata1: unknown timeout, cmd 0xb0 stat 0xff
> Jan  3 15:21:35 DatenGrab kernel: ata1: translated ATA stat/err 0xff/00
> to SCSI SK/ASC/ASCQ 0xb/47/00
> Jan  3 15:21:35 DatenGrab kernel: ata1: status=0xff { Busy }
> Jan  3 15:21:35 DatenGrab kernel: Assertion failed! qc !=
> NULL,drivers/scsi/libata-core.c,ata_pio_block,line=3216
> Jan  3 15:21:35 DatenGrab kernel: Unable to handle kernel NULL pointer
> dereference at virtual address 00000014
> Jan  3 15:21:35 DatenGrab kernel:  printing eip:
> Jan  3 15:21:35 DatenGrab kernel: e02d9a3e
> Jan  3 15:21:35 DatenGrab kernel: *pde = 00000000
> Jan  3 15:21:35 DatenGrab kernel: Oops: 0000 [#1]
> Jan  3 15:21:35 DatenGrab kernel: Modules linked in: edd ipv6 nfsd
> w83627hf hwmon_vid hwmon eeprom i2c_isa button battery ac af_packet xfs
> exportfs reiserfs ohci1394 ieee1394 sk98lin i2c_i801 i2c_core generic
> i8xx_tco shpchp pci_hotplug uhci_hcd intel_agp agpgart raid5 xor
> parport_pc lp parport sata_promise libata dm_mod sg skge ohci_hcd
> ehci_hcd usb_storage usbcore fan thermal processor piix sd_mod scsi_mod
> ide_disk ide_core
> Jan  3 15:21:35 DatenGrab kernel: CPU:    0
> Jan  3 15:21:35 DatenGrab kernel: EIP:    0060:[<e02d9a3e>]    Not
> tainted VLI
> Jan  3 15:21:35 DatenGrab kernel: EFLAGS: 00010292   (2.6.15-default)
> Jan  3 15:21:35 DatenGrab kernel: EIP is at ata_pio_block+0xb9/0xfd
> [libata]
> Jan  3 15:21:35 DatenGrab kernel: eax: 00000056   ebx: c14d6284   ecx:
> 00000000   edx: 00000000
> Jan  3 15:21:35 DatenGrab kernel: esi: 55b17c50   edi: 00000000   ebp:
> c14d6284   esp: def3df70
> Jan  3 15:21:35 DatenGrab kernel: ds: 007b   es: 007b   ss: 0068
> Jan  3 15:21:35 DatenGrab kernel: Process ata/0 (pid: 2179,
> threadinfo=def3c000 task=deefc580)
> Jan  3 15:21:35 DatenGrab kernel: Stack: c14d6284 deefb3c0 00000287
> e02d9b00 c14d683c c01230b6 e02d9ae3 00000001
> Jan  3 15:21:35 DatenGrab kernel:        00000000 00000000 00010000
> 00000000 00000000 deefc580 c01150bc 00100100
> Jan  3 15:21:35 DatenGrab kernel:        00200200 ffffffff ffffffff
> def3c000 de189f54 deefb3c0 c0122f77 c0125c9f
> Jan  3 15:21:35 DatenGrab kernel: Call Trace:
> Jan  3 15:21:35 DatenGrab kernel:  [<e02d9b00>] ata_pio_task+0x1d/0x54
> [libata]
> Jan  3 15:21:35 DatenGrab kernel:  [<c01230b6>] worker_thread+0x13f/0x19d
> Jan  3 15:21:35 DatenGrab kernel:  [<e02d9ae3>] ata_pio_task+0x0/0x54
> [libata]
> Jan  3 15:21:35 DatenGrab kernel:  [<c01150bc>]
> default_wake_function+0x0/0xc
> Jan  3 15:21:35 DatenGrab kernel:  [<c0122f77>] worker_thread+0x0/0x19d
> Jan  3 15:21:35 DatenGrab kernel:  [<c0125c9f>] kthread+0x63/0x8f
> Jan  3 15:21:35 DatenGrab kernel:  [<c0125c3c>] kthread+0x0/0x8f
> Jan  3 15:21:35 DatenGrab kernel:  [<c0101281>]
> kernel_thread_helper+0x5/0xb
> Jan  3 15:21:35 DatenGrab kernel: Code: 89 df 81 c7 d4 04 00 00 75 21 68
> 90 0c 00 00 68 fb cd 2d e0 68 ef cf 2d e0 68 b0 d5 2d e0 68 61 d0 2d e0
> e8 19 e1 e3 df 83 c4 14 <8a> 47 14 83 e8 05 3c 02 77 1b 83 e6 08 75 0c
> c7 83 e4 05 00 00
>