Additional - it is specific to the b2c2_flexcop driver; I just swapped the SkyStar2 card out - first with another SkyStar2 card (same results), and then with a NOVA-S card. The NOVA-S does NOT lock the last "ifconfig dvb0_? down". Does that help? Stone On Wednesday 13 July 2005 11:15, Johannes Stezenbach wrote: > stonewall@xxxxxxxxxxxxx wrote: > > Johannes - also on this - it is consistent. It does it every time. I'm > > actually quite surprised I can Ctl-C out of ifconfig when I do it at the > > command line . . . and interestingly enough, all dvb0_? devices are down. > > So it succeeds in bringing the device down on the last one - just hangs > > the ifconfig. > > > > The ifconfig I am using is part of the net-tools package from > > > > http://sites.inka.de/lina/linux/NetTools/ > > > > Version 1.60-r11 > > I don't think it's ifconfig's fault. > > At the moment I have no clue. You could try to enable more debug > options in your kernel e.g. CONFIG_DEBUG_SLAB, CONFIG_DEBUG_SPINLOCK, > CONFIG_DEBUG_SPINLOCK_SLEEP, CONFIG_DEBUG_BUGVERBOSE, > CONFIG_DEBUG_STACKOVERFLOW, CONFIG_DEBUG_STACK_USAGE, > CONFIG_DEBUG_PAGEALLOC and see if that turns something up. > > It would be nice if the kernel had some debug support for this, > so we could see who holds the mutex. > > One thing you could do is to add some debug to > dmx_section_feed_release_filter, like: > > struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *) > filter, *f; struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *) > feed; struct dvb_demux *dvbdmx = dvbdmxfeed->demux; > > if (down_interruptible (&dvbdmx->mutex)) { > printk("ARGH: %d\n", atomic_read(dvbdmx->mutex.count)); > return -ERESTARTSYS; > } > > If the mutex count is something != 0 or 1 the someone trashed > the memory. Otherwise someone likely hold the mutex and we > need to find out who. But before I put more work into this > I would like to hear that someone else can reproduce it. > > Johannes > > _______________________________________________ > > linux-dvb@xxxxxxxxxxx > http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
