Re: [GIT PULL] devel/pat + devel/kms.fixes-0.5 / dma-api check_unmap() warning

["Pasi Kärkkäinen" <pasik@iki.fi>]

On Mon, Aug 16, 2010 at 12:31:33PM -0400, Konrad Rzeszutek Wilk wrote:
> > > Hello,
> > > 
> > > I just tried the latest 2.6.32.19 kernel from xen/stable-2.6.32.x branch,
> > > which now includes the kms.fixes-0.5, on my radeon/supermicro testbox.
> > > 
> > > .. And KMS modesetting works properly now in Xen dom0! 
> > > My onboard ATI Radeon is the following:
> > > 
> > > # lspci -v | grep VGA
> > > 11:04.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02) (prog-if 00 [VGA controller])
> > > 
> > > It seems also X starts OK, and I can use the Gnome desktop. 
> > > I could even run multiple OpenGL 3D applications! (ok, glxgears :)
> > > 
> > > Thanks, great work!
> > > 
> > 
> > Hmm, actually it seems I got this in dom0 dmesg:
> 
> Good. I had seen this a month ago when I upgraded to FC13 (when it was
> rawhide) and it disappeared once I upgraded to the real FC13. So I
> blamed it on the alpha-rawhide X org driver. I could not reproduce this on
> FC13 with an ES1000 in a SuperMicro (some X8DBN+).
> 
> So, can you send to me, please:
> 
>  - lspci -vvvv
>  - cat /var/log/Xorg.0.log
>  - rpm -qa
>  - dmidecode
>  - dmesg
>  - xl dmesg
> 
> That way I should have enough data to see if I can track this errant
> issue down.
>

All of that is now here:
http://pasik.reaktio.net/xen/pv_ops-dom0-debug/radeon-info-for-konrad/



> > 
> > ------------[ cut here ]------------
> > WARNING: at lib/dma-debug.c:802 check_unmap+0x18f/0x615()
> > Hardware name: X7SB4/E
> > NULL NULL: DMA-API: device driver tries to free DMA memory it has not allocated [device address=0x000000002eecc000] [size=4096 bytes]
> > Modules linked in: ipt_MASQUERADE iptable_nat nf_nat bridge stp llc sunrpc ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 xen_gntdev xen_evtchn xenfs uinput e1000e shpchp iTCO_wdt serio_raw i2c_i801 iTCO_vendor_support joydev pcspkr floppy usb_storage video aic79xx output scsi_transport_spi radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: scsi_wait_scan]
> > Pid: 15, comm: events/0 Not tainted 2.6.32.19 #1
> > Call Trace:
> >  [<ffffffff81059e05>] warn_slowpath_common+0x7c/0x94
> >  [<ffffffff81059e74>] warn_slowpath_fmt+0x41/0x43
> >  [<ffffffff8124d6d5>] ? check_unmap+0x100/0x615
> >  [<ffffffff8124a7ab>] ? xen_virt_to_bus+0x11/0x13
> >  [<ffffffff8124d764>] check_unmap+0x18f/0x615
> >  [<ffffffff8100eca1>] ? xen_force_evtchn_callback+0xd/0xf
> >  [<ffffffff8100f3d2>] ? check_events+0x12/0x20
> >  [<ffffffff8124dc56>] debug_dma_free_coherent+0x6c/0x7a
> >  [<ffffffffa00411d3>] ttm_tt_free_alloced_pages+0x129/0x180 [ttm]
> >  [<ffffffffa00415fd>] ttm_tt_destroy+0x4d/0x8f [ttm]
> >  [<ffffffffa0041c00>] ttm_bo_release_list+0x96/0xd5 [ttm]
> >  [<ffffffffa0041b6a>] ? ttm_bo_release_list+0x0/0xd5 [ttm]
> >  [<ffffffff8123cc75>] kref_put+0x43/0x4d
> >  [<ffffffffa0042c1d>] ttm_bo_delayed_delete+0xad/0x121 [ttm]
> >  [<ffffffffa0042cb0>] ttm_bo_delayed_workqueue+0x1f/0x34 [ttm]
> >  [<ffffffff810754a2>] worker_thread+0x257/0x350
> >  [<ffffffff8107544a>] ? worker_thread+0x1ff/0x350
> >  [<ffffffffa0042c91>] ? ttm_bo_delayed_workqueue+0x0/0x34 [ttm]
> >  [<ffffffff81079f26>] ? autoremove_wake_function+0x0/0x39
> >  [<ffffffff8107524b>] ? worker_thread+0x0/0x350
> >  [<ffffffff81079c54>] kthread+0x7f/0x87
> >  [<ffffffff81013dea>] child_rip+0xa/0x20
> >  [<ffffffff81013750>] ? restore_args+0x0/0x30
> >  [<ffffffff81013de0>] ? child_rip+0x0/0x20
> > ---[ end trace 84e813abe3a8bd4d ]---
> > fuse init (API version 7.13)
> > end_request: I/O error, dev fd0, sector 0
> > end_request: I/O error, dev fd0, sector 0
> > DMA-API: debugging out of memory - disabling
> > 
> > 
> > The system is up-to-date Fedora 13, with xen/stable-2.6.32.x dom0 kernel.
> > 
> > Not fatal, things still seem to work..
> 
> Is this during shutdown or startup?
>

That warning/calltrace happens when starting X ..


-- Pasi