Re: 2.6.15-rt20, "bad page state", jackd

On Wed, 2006-03-08 at 13:48 -0800, Fernando Lopez-Lezcano wrote:
On Wed, 2006-03-08 at 11:36 -0800, Fernando Lopez-Lezcano wrote:
Hi all, I reported this in mid January (I thought I had sent to the list
but the report went to Ingo and Steven off list)

I'm seeing the same problem in 2.6.15-rt21 in some of my machines. After
a reboot into the kernel I just login as root in a terminal, start the
jackd sound server ("jackd -d alsa -d hw") and when stopping it (just
doing a <ctrl>c) I get a bunch of messages of this form:

Trying to fix it up, but a reboot is needed
Bad page state at __free_pages_ok (in process 'jackd', page c10012fc)

Has anyone else seen this?

I'm in the process of building an -rt21 kernel before posting more
detailed error messages (this kernel is patched with some additional
stuff).

This is what the errors look like (I'm attaching the whole dmesg output
and the .config file used to build the smp kernel):

Bad page state at __free_pages_ok (in process 'jackd', page c1013ce0)
flags:0x00000414 mapping:00000000 mapcount:0 count:0
Backtrace:
[<c015947d>] bad_page+0x7d/0xc0 (8)
[<c01598fd>] __free_pages_ok+0x9d/0x180 (36)
[<c015a5ac>] __pagevec_free+0x3c/0x50 (40)
[<c015db47>] release_pages+0x127/0x1a0 (16)
[<c016c93d>] free_pages_and_swap_cache+0x7d/0xc0 (80)
[<c01681ae>] unmap_region+0x13e/0x160 (28)
[<c0168461>] do_munmap+0xe1/0x120 (48)
[<c01684df>] sys_munmap+0x3f/0x60 (32)
[<c01034a1>] syscall_call+0x7/0xb (16)
Trying to fix it up, but a reboot is needed

[MUNCH]

I'm now building another -rt21 with DEBUG_PAGEALLOC and DEBUG_SLAB
enabled to see if I can pinpoint in more detail what's happening (if I
can get it to boot!).

I'm not able to boot with those two options enabled. It looks like it is
hanging after loading the sound drivers - this is on top of fc4. I can't
even get to single user and I'm searching for a serial cable right now
to see if I can get more information in a way that can be posted here.
Arghhh :-)
-- Fernando


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