DragonFly bugs List (threaded) for 2012-02
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[DragonFlyBSD - Bug #2308] System freeze when unloading snd_hda
Issue #2308 has been updated by Joachim de Groot.
File DSC00003.JPG added
The effects are the same whether X is started or not. Setting debug.debugger_on_panic has no effect, the system just freezes. I've attached a "screen shot" of a garbled console screen.
While trying this out, I found two other variations of this:
2) Module doesn't find sound card at first, system freezes at the second attempt to load the module:
root@deimos:~ # kldload snd_hda
pcm0: <NVidia MCP51 High Definition Audio Controller> mem 0xf2300000-0xf2303fff irq 21 at device 16.1 on pci0
pcm0: Audio Function Group not found!
root@deimos:~ # kldunload snd_hda
pcm0: detached
root@deimos:~ # kldload snd_hda
==> freeze
3) Sort of a interrupt conflict when loading the module:
pcm0: <NVidia MCP51 High Definition Audio Controller> mem 0xf2300000-0xf2303fff irq 21 at device 16.1 on pci0
pcm0: <HDA Codec: Realtek ALC260>
pcm0: <HDA Driver Revision: 20071129_0050>
intr 18 on cpu0 at 40001/40000 hz, livelocked limit engaged!
And then keyboard and mouse are no longer usable as interrupt 18 is occupied by the usb controller:
ohci0: <OHCI (generic) USB controller> mem 0xf2304000-0xf2304fff irq 18 at device 11.0 on pci0
When unloading the module via ssh, the system freezes as usual.
----------------------------------------
Bug #2308: System freeze when unloading snd_hda
http://bugs.dragonflybsd.org/issues/2308
Author: Joachim de Groot
Status: New
Priority: Normal
Assignee:
Category:
Target version:
When unloading snd_hda, the system (v3.1.0.197.gcc1635-DEVELOPMENT) freezes completely.
There is no panic; the screen just gets garbled and the system no longer responds to any interaction, may it be local or via network.
This shows up when loading the module:
pcm0: <NVidia MCP51 High Definition Audio Controller> mem 0xf2300000-0xf2303fff irq 21 at device 16.1 on pci0
pcm0: <HDA Codec: Realtek ALC260>
pcm0: <HDA Driver Revision: 20071129_0050>
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