[haiku-bugs] [Haiku] #5118: Haiku panics on HDA sound card
- From: "flaggy" <trac@xxxxxxxxxxxx>
- Date: Sun, 13 Dec 2009 16:05:04 -0000
#5118: Haiku panics on HDA sound card
---------------------------+------------------------------------------------
Reporter: flaggy | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: Unscheduled
Component: Audio & Video | Version: R1/Development
Keywords: | Blockedby:
Platform: x86 | Blocking:
---------------------------+------------------------------------------------
= Specification =
I have a lenovo r61i laptop. The sound card is an intel hda, according to
linux, the codec is Conexant CX20549 (Venice). The sound card works
flawlessly on linux.
Haiku revision: 34626 (compiled with gcc 4)
= Error message =
PANIC: vm_page_fault_unhandled page fault in kernel space at 0x0, ip
0x800dd4db
The backtrace is in the figure attached to this ticket.
= Experimentation =
I changed the code of the function `multi_audio_control` (src/add-
ons/kernel/drivers/audio/hda/hda_multi_audio.cpp) to always return
`B_ERROR` and the system was able to boot. Except for no sound, the system
seemed to be working well.
I thought the error could be in one of those `user_memcpy`, so I kept
adding `return B_ERROR` further down the code. Eventually I removed the
`return` from (line 1035)
{{{
return user_memcpy(originalChannels, channels,
sizeof(multi_channel_info)
*
description.request_channel_count);
}}}
and added {{{return B_ERROR}}} right after it. The system was able to
boot. If I would change `B_ERROR` to `B_OK`, then the same kernel panic
would come up again.
I'm out of ideas of what could it be. It seems to be something wrong with
`multi_audio_control` (or at least there's where things break badly), but
at the same time, the error seems to happen only when the function
returns. I may be missing something, being a C programmer with little
experience in C++. Does C++ calls something on the function's data after
the return?
--
Ticket URL: <http://dev.haiku-os.org/ticket/5118>
Haiku <http://dev.haiku-os.org>
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