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SubjectRe: [linux-usb-devel] 2.6.19-rc5-mm1
On Thu, 9 Nov 2006 16:58:31 -0500 (EST)
Alan Stern <stern@rowland.harvard.edu> wrote:

> On Thu, 9 Nov 2006, Mattia Dongili wrote:
>
> > On Thu, Nov 09, 2006 at 11:04:53AM -0800, Andrew Morton wrote:
> > >
> > > (added linux-scsi)
> > [...]
> > > > [27526.232000] EIP: [<e8074e26>]
> > > > scsi_device_dev_release_usercontext+0x36/0x100 [scsi_mod] SS:ESP
> > > > 0068:dfdb1e3c
> > > >
> > > > full dmesg attached, I can test patches and provide any useful
> > > > information if needed (just not now because the dock is at work).
> > >
> > > You're the second or third person to report this (to no effect, btw).
> >
> > oh, great. I was going to report the same (had with usb key unplug).
> > Linux version 2.6.19-rc5-mm1-1 (mattia@tadamune) (gcc version 4.1.2 20060901 (prerelease) (Debian 4.1.1-13)) #4 SMP Wed Nov 8 22:46:11 CET 2006
>
> I don't know exactly where the problem lies, but I have narrowed it down.
>
> In drivers/scsi/sd.c:sd_probe(), the call to add_disk() increases the
> device's refcount by 1. However in sd_remove(), the call to del_gendisk()
> decreases the device's refcount by 2. Consequently the structure is
> deallocated too early, causing the oops.
>
> Somebody who knows more than I do about add_disk() and del_gendisk() will
> have to figure what's going wrong.
>

hm. Maybe it's the disk_sysfs_symlinks() changes.

Could someone who can reproduce this please try this revert, on
2.6.19-rc2-mm2 through 2.6.19-rc5-mm1?



fs/partitions/check.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff -puN fs/partitions/check.c~revert-fix-ide-cs-hang-after-device-removal fs/partitions/check.c
--- a/fs/partitions/check.c~revert-fix-ide-cs-hang-after-device-removal
+++ a/fs/partitions/check.c
@@ -416,7 +416,7 @@ static char *make_block_name(struct gend

static int disk_sysfs_symlinks(struct gendisk *disk)
{
- struct device *target = disk->driverfs_dev;
+ struct device *target = get_device(disk->driverfs_dev);
int err;
char *disk_name = NULL;

@@ -452,8 +452,9 @@ err_out_dev_link:
sysfs_remove_link(&disk->kobj, "device");
err_out_disk_name:
kfree(disk_name);
- }
err_out:
+ put_device(target);
+ }
return err;
}

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