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> > What does that warning mean?
> Something about slowpath. Didn't dive any deeper in this. I think it complains
> about the workqueue taking too long to do its job.

Here is another one I get (it is unrelated to Xen - a general USB floppy issue):

scsi 9:0:0:0: Direct-Access     TEAC     FD-05PUB         3200 PQ: 0 ANSI: 0 CCS
sd 9:0:0:0: Attached scsi generic sg4 type 0
sd 8:0:0:0: [sdc] Assuming drive cache: write through
 sdc: sdc1 sdc2 sdc3
------------[ cut here ]------------
WARNING: at /mnt/tmp/fc11/xen/lib/dma-debug.c:860 check_for_stack+0xfa/0x15e()
Hardware name: To Be Filled By O.E.M.
ohci_hcd 0000:00:12.1: DMA-API: device driver maps memory fromstack 
Modules linked in: dvb_core tuner_simple tuner_types tda9887 tda8290 
snd_hda_codec_atihdmi snd_hda_codec_realtek radeon tuner snd_hda_intel 
snd_usb_audio snd_hda_codec cx8800 snd_usb_lib cx8802 cx88xx snd_rawmidi 
snd_pcm snd_seq_device ttm snd_hwdep pwc snd_timer ir_common snd drm 
v4l2_common videodev ata_generic tveeprom firewire_ohci pl2303 btcx_risc r8169 
usb_storage firewire_core i2c_piix4 soundcore pata_acpi usbserial v4l1_compat 
videobuf_dma_sg tg3 v4l2_compat_ioctl32 floppy videobuf_core i2c_algo_bit mii 
pata_atiixp snd_page_alloc i2c_core crc_itu_t shpchp serio_raw wmi pcspkr [last 
unloaded: scsi_wait_scan]
Pid: 999, comm: usb-storage Tainted: G        W #1
Call Trace:
 [<ffffffff8107ed59>] warn_slowpath_common+0xc9/0x10c
 [<ffffffff8107ee49>] warn_slowpath_fmt+0x60/0x84
 [<ffffffff81010dff>] ? xen_restore_fl_direct_end+0x0/0x1
 [<ffffffff8133b473>] check_for_stack+0xfa/0x15e
 [<ffffffff8133c7a6>] debug_dma_map_page+0x111/0x163
 [<ffffffff814ecc21>] dma_map_single_attrs.clone.2+0xfa/0x128
 [<ffffffff814ece0e>] usb_hcd_submit_urb+0x1bf/0xd84
 [<ffffffff81012463>] ? __xen_spin_lock+0x11f/0x150
 [<ffffffff8101200c>] ? xen_spin_unlock+0x27/0x7d
 [<ffffffff814ee3c1>] usb_submit_urb+0x463/0x487
 [<ffffffffa00d8407>] usb_stor_msg_common+0x105/0x1e1 [usb_storage]
 [<ffffffffa00d94d3>] usb_stor_ctrl_transfer+0xb5/0x100 [usb_storage]
 [<ffffffffa00d97f8>] usb_stor_CB_transport+0x59/0x2cd [usb_storage]
 [<ffffffffa00d8946>] usb_stor_invoke_transport+0x1fe/0x494 [usb_storage]
 [<ffffffffa00d804e>] usb_stor_ufi_command+0x8f/0xac [usb_storage]
 [<ffffffffa00dafbc>] usb_stor_control_thread+0x1e9/0x31f [usb_storage]
 [<ffffffff81010dff>] ? xen_restore_fl_direct_end+0x0/0x1
 [<ffffffffa00dadd3>] ? usb_stor_control_thread+0x0/0x31f [usb_storage]
 [<ffffffff810a4731>] kthread+0xbe/0xcd
 [<ffffffff81018aaa>] child_rip+0xa/0x20
 [<ffffffff81017c67>] ? int_ret_from_sys_call+0x7/0x1b
 [<ffffffff8101841d>] ? retint_restore_args+0x5/0x6
 [<ffffffff81018aa0>] ? child_rip+0x0/0x20
---[ end trace a7919e7f17c0a727 ]---
sd 8:0:0:0: [sdc] Assuming drive cache: write through
sd 8:0:0:0: [sdc] Attached SCSI removable disk
usb 1-5:1.0: uevent
usb 1-5: uevent
sd 9:0:0:0: [sdd] 2880 512-byte logical blocks: (1.47 MB/1.40 MiB)
ohci_hcd 0000:00:12.1: urb ffff8801d89f0e40 path 3 ep1in 93120000 cc 9 --> 
status -121
sd 9:0:0:0: [sdd] Write Protect is off
sd 9:0:0:0: [sdd] Mode Sense: 00 46 94 00
sd 9:0:0:0: [sdd] Assuming drive cache: write through
ohci_hcd 0000:00:12.1: urb ffff8801d2dd6a80 path 3 ep1in 92120000 cc 9 --> 
status -121

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