On Sat, 2009-01-24 at 05:38 +0530, Sudhakar wrote:
> Hi,
>
> In our labs, we encountered a kernel crash, while stressing scsi
> device add/remove code path of 2.6.28 kernel. lsscsi output on my
> machine looks like this:
>
> *******Start******
>
> [root@IMIT2S005 ~]# lsscsi
> [0:0:0:0] disk ATA ST3250620NS 3BKS -
> [0:0:1:0] disk ATA ST3250620NS 3BKS -
> [0:0:2:0] disk ATA ST3250620NS 3BKS -
> [0:0:3:0] disk ATA ST3250620NS 3BKS -
> [0:1:0:0] disk Dell VIRTUAL DISK 1028 /dev/sda
> [1:0:0:0] cd/dvd Optiarc DVD RW AD-7190S 1.00 /dev/scd0
> [5:0:0:0] disk Linux scsi_debug 0004 /dev/sdb
>
> *******End*********
>
> I have written script which would recursively add/remove the lone lun
> of scsi_debug device. My script looks like this:
>
> ********Start******
>
> [root@IMIT2S005 temp]# cat s.sh
> while [ true ]
> do
> echo "scsi remove-single-device 5 0 0 0" > /proc/scsi/scsi
> echo "scsi add-single-device 5 0 0 0" > /proc/scsi/scsi
> done
> [root@IMIT2S005 temp]#
>
> ********End********
>
> When the above script is run for approximately 10 seconds, we started
> to see the following messages and finally NULL pointer dereference.
>
> ********Start*******
>
> Jan 24 00:13:12 IMIT2S005 kernel: ------------[ cut here ]------------
> Jan 24 00:13:12 IMIT2S005 kernel: WARNING: at fs/sysfs/dir.c:462
> sysfs_add_one+0x33/0x39()
> Jan 24 00:13:12 IMIT2S005 kernel: sysfs: duplicate filename '5:0:0:0'
> can not be created
This is thought to be fixed by
commit 32aeef605aa01e1fee45e052eceffb00e72ba2b0
Author: Hannes Reinecke <hare@xxxxxxx>
Date: Tue Jan 13 16:50:37 2009 +0100
[SCSI] Skip deleted devices in __scsi_device_lookup_by_target()
Which is now upstream.
James
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
