Re: LOR on kldunload snd_hda

On Tue, 7 Jul 2009 22:14:01 -0300
Gonzalo Nemmi <gnemmi_at_gmail.com> wrote:
> log in
> kldload snd_hda
> cat /dev/sndstat
> 
> FreeBSD Audio Driver (newpcm: 32 bit 20090615000/i386)
> Installed devices:
> pcm0: <HDA Sigmatel STAC9228X PCM #0 Analog> at cad 0 nid 1 on hdac0
> kld  snd_hda
> [MPSAFE] (1p:1v/1r:1v channels duplex default)
> 
> mixer
> Mixer vol is currently set to 75:75
> Mixer pcm is currently set to 75:75
> Mixer speaker is currently set to 75:75
> Mixer mic is currently set to 0:0
> Mixer rec is currently set to 0:0
> 
> "insert cd"
> 
> cdcontrol -f /dev/acd0 play 1
> 
> "no sound at all"
> 

Hardware vendors nowadays tend to ignore analog connection between cd
drive and sound card. Obviously, you don't have "cd" mixer . cdcontrol

Instead, try dd if=/dev/acd0t01 of=/dev/dspcd bs=2352 . Or use other
proper multimedia player with digital audio extraction support.

> cdcontrol eject
> kldunload snd_hda
> 
> Jul  7 21:44:15 gargoyle login: ROOT LOGIN (root) ON ttyv0
> Jul  7 21:54:27 gargoyle kernel: hdac0: <Intel 82801H High
> Definition  Audio Controller> mem 0xf6dfc000-0xf6dfffff irq 21 at
> device 27.0 on  pci0
> Jul  7 21:54:27 gargoyle kernel: hdac0: HDA Driver Revision: 
> 20090624_0136
> Jul  7 21:54:27 gargoyle kernel: hdac0: [ITHREAD]
> Jul  7 21:54:27 gargoyle kernel: hdac0: HDA Codec #0: Sigmatel
> STAC9228X Jul  7 21:54:27 gargoyle kernel: pcm0: <HDA Sigmatel
> STAC9228X PCM #0  Analog> at cad 0 nid 1 on hdac0
> Jul  7 22:03:27 gargoyle kernel: lock order reversal:
> Jul  7 22:03:27 gargoyle kernel: 1st 0xc0da8cdc kernel linker
> (kernel  linker) _at_ /usr/src/sys/kern/kern_linker.c:1079
> Jul  7 22:03:27 gargoyle kernel: 2nd 0xc0daa4e4 sysctl lock (sysctl 
> lock) _at_ /usr/src/sys/kern/kern_sysctl.c:255

This probably has nothing or little to do with snd_hda. There are
other kernel modules that might trigger this kind of LOR during detach
due to freeing sysctl context.

> Jul  7 22:03:27 gargoyle kernel: KDB: stack backtrace:
> Jul  7 22:03:27 gargoyle kernel: 
> db_trace_self_wrapper(c0c5b564,e6df7ac0,c08b5b35,c08a68db,c0c5e3f9,
> ...)  at db_trace_self_wrapper+0x26
> Jul  7 22:03:27 gargoyle kernel: 
> kdb_backtrace(c08a68db,c0c5e3f9,c452cae8,c452ad40,e6df7b1c,...) at 
> kdb_backtrace+0x29
> Jul  7 22:03:27 gargoyle kernel: 
> _witness_debugger(c0c5e3f9,c0daa4e4,c0c58fbb,c452ad40,c0c58ec2,...)
> at  _witness_debugger+0x25
> Jul  7 22:03:27 gargoyle kernel: 
> witness_checkorder(c0daa4e4,9,c0c58ec2,ff,0,...) at 
> witness_checkorder+0x839
> Jul  7 22:03:27 gargoyle kernel:
> _sx_xlock(c0daa4e4,0,c0c58ec2,ff,0,...)  at _sx_xlock+0x85
> Jul  7 22:03:27 gargoyle kernel: 
> sysctl_ctx_free(c4d7379c,0,c4e1c712,4a1,c4ca9480,...) at 
> sysctl_ctx_free+0x30
> Jul  7 22:03:27 gargoyle kernel: 
> pcm_unregister(c488f800,c4da3860,c0d3b6c8,a3c,c4887a80,...) at 
> pcm_unregister+0x4e1m,ksd
> Jul  7 22:03:27 gargoyle kernel: 
> device_detach(c488f800,c0865663,c0da9df0,c4dd22d4,c4a95100,...) at 
> device_detach+0x8c
> Jul  7 22:03:27 gargoyle kernel: 
> driver_module_handler(c4887a80,1,c4dd22d4,109,0,...) at 
> driver_module_handler+0x29c
> Jul  7 22:03:27 gargoyle kernel: 
> module_unload(c4887a80,c0c54c7c,273,270,c08592b6,...) at 
> module_unload+0x43
> Jul  7 22:03:27 gargoyle kernel: 
> linker_file_unload(c4a92600,0,c0c54c7c,437,c4dba000,...) at 
> linker_file_unload+0x15e
> Jul  7 22:03:27 gargoyle kernel: 
> kern_kldunload(c4ca9480,2,0,e6df7d2c,c0b98e73,...) at 
> kern_kldunload+0xd5
> Jul  7 22:03:27 gargoyle kernel: 
> kldunloadf(c4ca9480,e6df7cf8,8,c0c5f4bb,c0d3f0b0,...) at 
> kldunloadf+0x2b
> Jul  7 22:03:27 gargoyle kernel: syscall(e6df7d38) at syscall+0x2a3
> Jul  7 22:03:27 gargoyle kernel: Xint0x80_syscall() at 
> Xint0x80_syscall+0x20
> Jul  7 22:03:27 gargoyle kernel: --- syscall (444, FreeBSD ELF32, 
> kldunloadf), eip = 0x280d573b, esp = 0xbfbfe47c, ebp = 0xbfbfecc8
> --- Jul  7 22:03:27 gargoyle kernel: pcm0: detached
> Jul  7 22:03:27 gargoyle kernel: hdac0: detached
> 
>

--
Ariff Abdullah
FreeBSD

... Recording in stereo is obviously too advanced
    and confusing for us idiot ***** users :P ........

... Going with the standard and orthodox
    is the death of intellect ..............