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From: Tim Kientzle <tim@kientzle.com>
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Subject: Consistent crash of BeagleBone kernel
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Date: Sat, 8 Aug 2015 17:24:37 -0700
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I=E2=80=99m seeing the following crash quite consistently on r286438.  =
It looks like the recent work on the kernel linker locking still has =
some issues.

Any suggested workarounds?

Tim

=3D=3D=3D=3D log trace =3D=3D=3D
...
Starting file system checks:
/dev/mmcsd0s2a: FILE SYSTEM CLEAN; SKIPPING CHECKS
/dev/mmcsd0s2a: clean, 7320851 free (179 frags, 915084 blocks, 0.0% =
fragmentation)
lock order reversal:
 1st 0xcd225040 bufwait (bufwait) @ =
/Users/tim/projects/crochet/src-head/sys/kern/vfs_bio.c:3191
 2nd 0xc2e69400 dirhash (dirhash) @ =
/Users/tim/projects/crochet/src-head/sys/ufs/ufs/ufs_dirhash.c:281
=E2=80=A6 usual stack trace omitted ...
Mounting local file systems:random: unblocking device.
.
ELF ldconfig path: /lib /usr/lib /usr/lib/compat
Setting hostname: beaglebone.
Setting up =
harvesting:[HIGH_PERFORMANCE],[FS_ATIME],SWI,INTERRUPT,NET_NG,NET_ETHER,NE=
T_TUN,MOUSE,KEYBOARD,ATTACH,CACHED
Feeding entropy:.
lock order reversal:
 1st 0xc083ef40 kernel linker (kernel linker) @ =
/Users/tim/projects/crochet/src-head/sys/kern/kern_linker.c:1030
 2nd 0xc2d63c94 ufs (ufs) @ =
/Users/tim/projects/crochet/src-head/sys/kern/vfs_lookup.c:529
KDB: stack backtrace:
panic: _sx_xlock_hard: recursed on non-recursive sx kernel linker @ =
/Users/tim/projects/crochet/src-head/sys/kern/kern_linker.c:552

KDB: enter: panic
[ thread pid 168 tid 100079 ]
Stopped at      $d.7:   ldrb    r15, [r15, r15, ror r15]!
db> bt
Tracing pid 168 tid 100079 td 0xc30db6a0
panic: _sx_xlock_hard: recursed on non-recursive sx kernel linker @ =
/Users/tim/projects/crochet/src-head/sys/kern/kern_linker.c:552

Uptime: 4m0s
Rebooting...