On Fri, Jun 27, 2014 at 02:44:41PM -0400, Mikulas Patocka wrote:
> I suggest - split it to two patches, a minimal patch that fixes the bug by
> changing sleeper to completion and the second patch with remaining changes
> - so that only the first patch can be backported to stable kernels.
Agreed.
On Fri, 27 Jun 2014, Mikulas Patocka wrote:
>
>
> On Fri, 27 Jun 2014, Minfei Huang wrote:
>
> > BUG: unable to handle kernel NULL pointer dereference at 0046
> > IP: [] dec_count+0x5f/0x80 [dm_mod]
> > PGD 0
> > Oops: [#1] SMP
> > last sysfs file:
> > /sys/devices/pci:0
On Fri, 27 Jun 2014, Joe Thornber wrote:
> On Fri, Jun 27, 2014 at 12:01:30PM +0800, Minfei Huang wrote:
> > The io address in callback function will become the danging point,
> > cause by the thread of sync io wakes up by other threads
> > and return to relieve the io address,
>
> Yes, well fo
On Fri, 27 Jun 2014, Minfei Huang wrote:
> BUG: unable to handle kernel NULL pointer dereference at 0046
> IP: [] dec_count+0x5f/0x80 [dm_mod]
> PGD 0
> Oops: [#1] SMP
> last sysfs file:
> /sys/devices/pci:00/:00:02.2/:02:00.0/host0/scsi_host/host0/proc_name
>
> Pi
On Fri, Jun 27, 2014 at 12:01:30PM +0800, Minfei Huang wrote:
> The io address in callback function will become the danging point,
> cause by the thread of sync io wakes up by other threads
> and return to relieve the io address,
Yes, well found. I prefer the following fix however.
- Joe
Auth
BUG: unable to handle kernel NULL pointer dereference at 0046
IP: [] dec_count+0x5f/0x80 [dm_mod]
PGD 0
Oops: [#1] SMP
last sysfs file:
/sys/devices/pci:00/:00:02.2/:02:00.0/host0/scsi_host/host0/proc_name
Pid: 2708, comm: kcopyd Tainted: GW --- H
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