Bug 16298

Summary:	xawtv stuck in videobuf_waiton
Product:	v4l-dvb	Reporter:	Stas Sergeev (stsp2)
Component:	saa7134	Assignee:	Hans Verkuil (hverkuil)
Status:	REOPENED ---
Severity:	normal	CC:	alan, mchehab
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.3.2-6.fc16	Subsystem:
Regression:	No	Bisected commit-id:

Description Stas Sergeev 2010-06-26 11:54:00 UTC

If you accidentally start 2 instances
of xawtv, one of them gets stuck forever
and can't be terminated.
This is 100% reproduceable.
Here is the stack trace:

xawtv         D ffff88005d3cd540     0  2712      1 0x00000080
ffff88005d3efb28 0000000000000082 0000000000000202 ffff88000000af00
ffff88005d3efac8 0000000000000202 ffff88005d3efd38 ffff88005d3effd8
ffff88005d3effd8 000000000000f9b0 00000000000157c0 ffff880060e183c8
Call Trace:
[<ffffffff81064a7d>] ? prepare_to_wait+0x67/0x74
[<ffffffffa02336a2>] videobuf_waiton+0x145/0x163 [videobuf_core]
[<ffffffff8106480b>] ? autoremove_wake_function+0x0/0x34
[<ffffffff810e3b92>] ? vfree+0x29/0x2b
[<ffffffffa038765a>] saa7134_dma_free+0x45/0x67 [saa7134]
[<ffffffffa038c947>] buffer_release+0x9/0xb [saa7134]
[<ffffffffa0233dd7>] videobuf_queue_cancel+0xaf/0xd5 [videobuf_core]
[<ffffffffa0233e26>] videobuf_streamoff+0x29/0x39 [videobuf_core]
[<ffffffffa038bde1>] saa7134_streamoff+0x35/0x62 [saa7134]
[<ffffffffa02b51ea>] __video_do_ioctl+0x13e6/0x3327 [videodev]
[<ffffffff8128db87>] ? notify_update+0x31/0x33
[<ffffffff81291bd7>] ? do_con_write+0x1ba3/0x1bea
[<ffffffff8142dcf5>] ? atomic_notifier_call_chain+0x13/0x15
[<ffffffff81291bd7>] ? do_con_write+0x1ba3/0x1bea
[<ffffffffa02b3a37>] ? might_fault+0x1c/0x1e [videodev]
[<ffffffffa02b76e3>] video_ioctl2+0x2d4/0x3a1 [videodev]
[<ffffffff8104bc2c>] ? release_console_sem+0x18d/0x1be
[<ffffffff81064afd>] ? remove_wait_queue+0x30/0x3b
[<ffffffffa02b311c>] v4l2_ioctl+0x38/0x3a [videodev]
[<ffffffff8110de87>] vfs_ioctl+0x75/0xa1
[<ffffffff8110e3a8>] do_vfs_ioctl+0x47e/0x4c4
[<ffffffff81101363>] ? fsnotify_modify+0x67/0x6f
[<ffffffff8110e43f>] sys_ioctl+0x51/0x74
[<ffffffff81009b02>] system_call_fastpath+0x16/0x1b

Comment 1 Stas Sergeev 2012-08-09 19:38:40 UTC

Bump kernel version.