backtrace within dmesg

from /var/log/messages  OR the periodic run OR both
Still daily lockups in Xorg when browsers open, sometimes when not. 


+   __stack_chk_init(0)... random: unblocking device.
+done.
+#3 0xb752ad7e at os_acquire_mutex+0x3e
+#4 0xb7434583 at _nv019165rm+0xb
+Expensive timeout(9) function: 0xb55a7b40(0xbe67c000) 0.031685381 s
+Expensive timeout(9) function: 0xb5609ad0(0xbe55b000) 0.779665921 s
+SMP: AP CPU #4 Launched!
+SMP: AP CPU #2 Launched!
+SMP: AP CPU #5 Launched!
+   init_TSC_tc(0)... Timecounter "TSC-low" frequency 1600025054 Hz quality 1000


+WARNING: / was not properly dismounted

+ 1st 0xddc38f04 bufwait (bufwait) _at_ /usr/src/sys/kern/vfs_bio.c:3500
+ 2nd 0xbf533200 dirhash (dirhash) _at_ /usr/src/sys/ufs/ufs/ufs_dirhash.c:281
+GEOM_SCHED: Loading: mp = 0xbffb1084, g_sched_class = 0xbffb1084.
+#3 0xb752b1dc at os_acquire_spinlock+0x2c
+#4 0xb7262374 at _nv011973rm+0x190
+ 1st 0xc1191a30 ufs (ufs) _at_ /usr/src/sys/kern/vfs_syscalls.c:3364
+ 2nd 0xddc506e8 bufwait (bufwait) _at_ /usr/src/sys/ufs/ffs/ffs_vnops.c:280
+ 3rd 0xc2abfc68 ufs (ufs) _at_ /usr/src/sys/kern/vfs_subr.c:2600
+#9 0xb5eafc55 at softdep_sync_buf+0xb55
+#11 0xb5ebe4b4 at ffs_fdatasync+0x24
+#12 0xb6192057 at VOP_FDATASYNC_APV+0xd7
+#13 0xb5c9868d at kern_fsync+0x21d
+#14 0xb5c98762 at sys_fdatasync+0x22
+#15 0xb6155fa5 at syscall+0x3b5
+#16 0xb6140ede at Xint0x80_syscall+0x2e
+Expensive timeout(9) function: 0xb5bd5c90(0xc01f3000) 2.169794100 s