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Date: Thu, 10 Jan 2013 02:14:22 +0100
From: Roel Bouwman <roel@bouwman.net>
To: freebsd-arm@freebsd.org
Subject: Re: FreeBSD/armv6z/clang on Raspberry Pi 512MB (with U-Boot + ubldr)
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Gianni,

On Wed, Jan 09, 2013 at 10:00:15PM +0100, you (Giovanni Trematerra) wrote the following:
> Could you show the backtrace?

Somewhat after the fact, as Daisuke has also experienced the same
issue and already posted the solution. But to be complete:

panic: Bad link elm 0xc10fcbd0 next->prev != elm
KDB: enter: panic
[ thread pid 65 tid 100049 ]
Stopped at      $d:     ldrb    r15, [r15, r15, ror r15]!
db> bt
Tracing pid 65 tid 100049 td 0xc2fe8620
end() at 0xd49bf814
scp=0xd49bf814 rlv=0xc04054c4 (db_trace_thread+0x34)
        rsp=0xd49bf7f8 rfp=0xc053d728
Bad frame pointer: 0xc053d728

Booting with PIO (hw.bcm2835.sdhci.pio=1) solved the issue:

Starting file system checks:
** SU+J Recovering /dev/mmcsd0s2a
** Reading 8388608 byte journal from inode 4.
** Building recovery table.
** Resolving unreferenced inode list.
** Processing journal entries.
** 271 journal records in 19968 bytes for 43.43% utilization
** Freed 50 inodes (0 dirs) 20 blocks, and 208 frags.

***** FILE SYSTEM MARKED CLEAN *****

Thanks!

Roel.