(unknown charset) panic: _mtx_lock_sleep: recursed on non-recursive mutex ahc_lock _at_ /usr/src/sys/dev/aic7xxx/aic7xxx_osm.h:203

Hi,

Got this panic on a July 4 -current when writing to a SCSI device.  I
can read just fine, and occasionally write.  I can consistently panic
the system within 30 seconds by running "fdisk -BI /dev/daX" three or
four times.  More complicated writes make the panic faster.

Full verbose dmesg, etc, in pr/114489.

==ml

sardines/boot/kernel;kgdb kernel.symbols /var/crash/vmcore.0 
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
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Unread portion of the kernel message buffer:
panic: _mtx_lock_sleep: recursed on non-recursive mutex ahc_lock _at_ /usr/src/sys/dev/aic7xxx/aic7xxx_osm.h:203

cpuid = 0
KDB: enter: panic
Physical memory: 243 MB
Dumping 62 MB: 47 31 15

#0  doadump () at pcpu.h:195
195     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) backtrace
#0  doadump () at pcpu.h:195
#1  0xc048c629 in db_fncall (dummy1=-875263368, dummy2=0, dummy3=524358, dummy4=0xcbd489e4 "ÐèHÀ")
    at /usr/src/sys/ddb/db_command.c:486
#2  0xc048cb95 in db_command_loop () at /usr/src/sys/ddb/db_command.c:401
#3  0xc048e305 in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_main.c:222
#4  0xc0772426 in kdb_trap (type=3, code=0, tf=0xcbd48b88) at /usr/src/sys/kern/subr_kdb.c:502
#5  0xc09faa2b in trap (frame=0xcbd48b88) at /usr/src/sys/i386/i386/trap.c:620
#6  0xc09e053b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7  0xc07725a2 in kdb_enter (msg=0xc0a908ed "panic") at cpufunc.h:60
#8  0xc074b954 in panic (fmt=0xc0a8f7ce "_mtx_lock_sleep: recursed on non-recursive mutex %s _at_ %s:%d\n")
    at /usr/src/sys/kern/kern_shutdown.c:547
#9  0xc07400b7 in _mtx_lock_sleep (m=0xc228ca30, tid=3255925760, opts=0, 
    file=0xc0a51887 "/usr/src/sys/dev/aic7xxx/aic7xxx_osm.h", line=203) at /usr/src/sys/kern/kern_mutex.c:311
#10 0xc07402df in _mtx_lock_flags (m=0xc228ca30, opts=0, file=0xc0a51887 "/usr/src/sys/dev/aic7xxx/aic7xxx_osm.h", 
    line=203) at /usr/src/sys/kern/kern_mutex.c:187
#11 0xc04c95f7 in ahc_timeout (scb=0xc22a67b0) at aic7xxx_osm.h:203
#12 0xc04d6f1e in ahc_platform_timeout (arg=0xc22a67b0) at aic_osm_lib.c:72
#13 0xc075d1c9 in softclock (dummy=0x0) at /usr/src/sys/kern/kern_timeout.c:281
#14 0xc07308a5 in ithread_loop (arg=0xc2115310) at /usr/src/sys/kern/kern_intr.c:1036
#15 0xc072dd28 in fork_exit (callout=0xc07306f0 <ithread_loop>, arg=0xc2115310, frame=0xcbd48d38)
    at /usr/src/sys/kern/kern_fork.c:797
#16 0xc09e05b0 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:205
(kgdb) up 9
#9  0xc07400b7 in _mtx_lock_sleep (m=0xc228ca30, tid=3255925760, opts=0, 
    file=0xc0a51887 "/usr/src/sys/dev/aic7xxx/aic7xxx_osm.h", line=203) at /usr/src/sys/kern/kern_mutex.c:311
311                     KASSERT((m->lock_object.lo_flags & LO_RECURSABLE) != 0,


-- 
Michael W. Lucas 	mwlucas_at_BlackHelicopters.org, mwlucas_at_FreeBSD.org
		http://www.BlackHelicopters.org/~mwlucas/
      Coming Soon: "Absolute FreeBSD" -- http://www.AbsoluteFreeBSD.com
On 5/4/2007, the TSA kept 3 pairs of my soiled undies "for security reasons."