Re: scsi cmd slab leak? (Was Re: [ck] Anyone been having OOM killer problems lately?)

[Chase Venters <chase.venters@clientec.com>]

On Thursday 19 January 2006 03:18, Con Kolivas wrote:
> On Thursday 19 January 2006 20:15, Chase Venters wrote:
> > On Thursday 19 January 2006 01:49, Con Kolivas wrote:
> > > > 	Do I have something madly leaking in my kernel?
> > >
> > > Yes! post /proc/slabinfo
> >
> > (attached). Looks like quite a few scsi commands! Next steps?
>
> Inded it does
> scsi_cmd_cache    1547440 1547440    384   10    1 : tunables   54   27   
> 8 : slabdata 154744 154744      0
>
> This looks suspiciously large. To be absolutely certain, though, you have
> to reproduce the problem with a vanilla kernel, and no binary drivers
> anywhere. My patches don't touch the scsi code directly, but the only way
> to be certain is to use vanilla.

I'll have to try and get around to that soon - I'm currently busy with some 
various work and can't afford the time just yet :/.

Also, I just realized that I copied lkml and scsi without providing any useful 
context. Kernel is 2.6.15-ck1 with the Marvell sk98lin patch and (barf) 
nvidia.ko. I noticed after having the OOM killer make its rounds a few times 
that the slab layer was eating in excess of 600MB.

lspci:

00:00.0 Host bridge: Intel Corporation 915G/P/GV/GL/PL/910GL Processor to I/O 
Controller (rev 04)
00:01.0 PCI bridge: Intel Corporation 915G/P/GV/GL/PL/910GL PCI Express Root 
Port (rev 04)
00:1b.0 Class 0403: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High 
Definition Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI 
Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI 
Express Port 2 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) 
USB UHCI #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) 
USB UHCI #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) 
USB UHCI #3 (rev 03)
00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) 
USB UHCI #4 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) 
USB2 EHCI Controller (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d3)
00:1f.0 ISA bridge: Intel Corporation 82801FB/FR (ICH6/ICH6R) LPC Interface 
Bridge (rev 03)
00:1f.1 IDE interface: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) 
IDE Controller (rev 03)
00:1f.2 Class 0106: Intel Corporation 82801FR/FRW (ICH6R/ICH6RW) SATA 
Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus 
Controller (rev 03)
01:03.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A IEEE-1394a-2000 
Controller (PHY/Link)
01:04.0 Mass storage controller: <pci_lookup_name: buffer too small> (rev 13)
01:09.0 Multimedia audio controller: Creative Labs SB Audigy (rev 04)
01:09.1 Input device controller: Creative Labs SB Audigy MIDI/Game port (rev 
04)
01:09.2 FireWire (IEEE 1394): Creative Labs SB Audigy FireWire Port (rev 04)
01:0a.0 SCSI storage controller: Adaptec AHA-7850 (rev 03)
02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8053 Gigabit 
Ethernet Controller (rev 15)
04:00.0 VGA compatible controller: nVidia Corporation Unknown device 0092 (rev 
a1)

config.gz attached. I'd also like to note that I've been getting this in my 
ring buffer when attempting to burn CD's on a PX-716A:

(scsi0:A:4:0): No or incomplete CDB sent to device.
scsi0: Issued Channel A Bus Reset. 1 SCBs aborted
(scsi0:A:4:0): Unexpected busfree while idle
SEQADDR == 0x16a
(scsi0:A:4:0): No or incomplete CDB sent to device.
scsi0: Issued Channel A Bus Reset. 1 SCBs aborted
sr 0:0:4:0: SCSI error: return code = 0x70000
(scsi0:A:4:0): Unexpected busfree while idle
SEQADDR == 0x16a
(scsi0:A:4:0): No or incomplete CDB sent to device.
scsi0: Issued Channel A Bus Reset. 1 SCBs aborted
(scsi0:A:4:0): Unexpected busfree while idle
SEQADDR == 0x16a
(scsi0:A:4:0): No or incomplete CDB sent to device.
scsi0: Issued Channel A Bus Reset. 1 SCBs aborted
sr 0:0:4:0: SCSI error: return code = 0x70000
(scsi0:A:4:0): Unexpected busfree while idle
SEQADDR == 0x16a
(scsi0:A:4:0): No or incomplete CDB sent to device.
scsi0: Issued Channel A Bus Reset. 1 SCBs aborted

...but I don't think this is directly related, because this has been happening 
since at least 2.6.13 iirc. Just being thorough.

Apologies to lkml & scsi for the brief/confusing earlier message.

> Cheers,
> Con

Thanks,
Chase

Attachment: config.gz
Description: GNU Zip compressed data