Hi,
verified to be present in linux-2.6.31-rc5, here's some info dumped
from RAM, since the machine hangs, sorry if it is not complete but I
couldn't get anything better for now, nothing is printed on
the screen.
The userspace app is capture-example from v4l2-apps/test
and the command which should be triggering the bug is:
xioctl(fd, VIDIOC_STREAMON, &type)
=============================================
[ INFO: possible recursive locking detected ]
2.6.31-rc5-ezxdev #53
---------------------------------------------
capture-example/967 is trying to acquire lock:
(&pcdev->lock {......}, at: [<c019e97c>] pxa_videobuf_queue+0x28/0xc4
but task is already holding lock:
(&pcdev->lock {......} buf_streamon+0x40/0xc0
other info that might help us debug this:
held by capture-example/967:
#0: o_lock
soc_camera_streamon+0x40/0x70
#1: lock
videobuf_streamon+0x14/0xc0
#2:
eobuf_streamon+0x40/0xc0
The stack backtrace I managed to get is even worse, something like:
-----------------------------------
stack backtrace: [<c002db8c>] 0x0/0xe0)
idate_chain+0x5b0/0xd84)
89.995951] [<c0064ac8>]
e_chain+0x5b0/0xd84)
5a60>]
from [<c00668e8>]
0x5c/0x70)
00668e8>]
_irqsave+0x4c/0x60)
6230] [<c023cea4>]
rqsave+0x4c/0x60)
c>]
eamon+0x70/0xc0)
3] [<c0199b4c>]
on+0x70/0xc0)
(soc_camera_streamon+0x58/0x70)
[ 89.996488] [<c019ccc4>]
soc_camera_streamon+0x58/0x70)
rom [<c0191320>]
tl+0x14e0/0x3404)
-------------------------------------
With another build with debug enabled I extracted this sequence:
[ 104.385424] camera 0-0: PXA Camera driver attached to camera 0
[ 104.385513] pxa27x-camera pxa27x-camera.0: Registered platform device at cc923d60 data c0316fe0
[ 104.385554] pxa27x-camera pxa27x-camera.0: pxa_camera_activate: Init gpios
[ 104.447596] camera 0-0: set width: 640 height: 480
[ 104.447642] camera 0-0: camera device open
[ 104.502178] camera 0-0: set width: 640 height: 480
[ 104.502663] camera 0-0: soc_camera_reqbufs: 1
[ 104.502725] camera 0-0: count=4, size=0
[ 104.508618] camera 0-0: mmap called, vma=0xcc07fc28
[ 104.508926] camera 0-0: vma start=0x40144000, size=614400, ret=0
[ 104.542879] camera 0-0: mmap called, vma=0xcc05b1d8
[ 104.542990] camera 0-0: vma start=0x401da000, size=614400, ret=0
[ 104.546148] camera 0-0: mmap called, vma=0xcc05b6a8
[ 104.546243] camera 0-0: vma start=0x40270000, size=614400, ret=0
[ 104.549401] camera 0-0: mmap called, vma=0xcc05b4f0
[ 104.549509] camera 0-0: vma start=0x40306000, size=614400, ret=0
[ 104.550380] camera 0-0: pxa_videobuf_prepare (vb=0xcc91e760) 0x40144000 614400
[ 104.714301] pxa27x-camera pxa27x-camera.0: DMA: sg_first=cd83e000, sglen=150, ofs=0, dma.desc=acb94000
[ 104.715766] camera 0-0: pxa_videobuf_prepare (vb=0xcc91e560) 0x401da000 614400
[ 104.782840] pxa27x-camera pxa27x-camera.0: DMA: sg_first=cd852000, sglen=150, ofs=0, dma.desc=acde7000
[ 104.783988] camera 0-0: pxa_videobuf_prepare (vb=0xcc91e660) 0x40270000 614400
[ 104.841132] pxa27x-camera pxa27x-camera.0: DMA: sg_first=cd855000, sglen=150, ofs=0, dma.desc=ac090000
[ 104.863313] camera 0-0: pxa_videobuf_prepare (vb=0xcc91e860) 0x40306000 614400
[ 104.960047] pxa27x-camera pxa27x-camera.0: DMA: sg_first=cd858000, sglen=150, ofs=0, dma.desc=acdd2000
[ 104.960922] camera 0-0: soc_camera_streamon
[ 104.961840] camera 0-0: pxa_videobuf_queue (vb=0xcc91e760) 0x40144000 614400 active=(null)
maybe some more pxa_videobuf_queue lines are missing,
but again I was not able to extract them from RAM.
Thanks,
Antonio
--
Antonio Ospite
http://ao2.it
PGP public key ID: 0x4553B001
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