when booting stable/9 under a debug kernel with WITNESS
enabled and verbose I get the following panic..
It seems very much like the discussion from a year back on
current:
http://lists.freebsd.org/pipermail/freebsd-current/2012-January/031375.html
Any ideas?
uhub1: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus1
uhub0: 2 ports with 2 removable, self powered
uhub1: 2 ports with 2 removable, self powered
panic: mtx_lock_spin: recursed on non-recursive mutex cnputs_mtx @
/usr/src/sys/kern/kern_cons.c:500
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a/frame 0xffffff9185023940
kdb_backtrace() at kdb_backtrace+0x37/frame 0xffffff9185023a00
panic() at panic+0x1d8/frame 0xffffff9185023b00
_mtx_lock_spin_flags() at _mtx_lock_spin_flags+0x123/frame 0xffffff9185023b40
cnputs() at cnputs+0x7a/frame 0xffffff9185023b60
putbuf() at putbuf+0xbf/frame 0xffffff9185023be0
kvprintf() at kvprintf+0x83/frame 0xffffff9185023d20
vprintf() at vprintf+0x85/frame 0xffffff9185024580
printf() at printf+0x67/frame 0xffffff9185024660
witness_checkorder() at witness_checkorder+0x794/frame 0xffffff9185024720
_mtx_lock_spin_flags() at _mtx_lock_spin_flags+0x94/frame 0xffffff9185024760
uart_cnputc() at uart_cnputc+0x3e/frame 0xffffff9185024780
cnputc() at cnputc+0x4c/frame 0xffffff91850247b0
cnputs() at cnputs+0x26/frame 0xffffff91850247d0
putbuf() at putbuf+0xbf/frame 0xffffff9185024850
kvprintf() at kvprintf+0x83/frame 0xffffff9185024990
vprintf() at vprintf+0x85/frame 0xffffff91850251f0
printf() at printf+0x67/frame 0xffffff91850252d0
witness_checkorder() at witness_checkorder+0x794/frame 0xffffff9185025390
_mtx_lock_spin_flags() at _mtx_lock_spin_flags+0x94/frame 0xffffff91850253d0
cpu_new_callout() at cpu_new_callout+0x4f/frame 0xffffff9185025400
callout_reset_on() at callout_reset_on+0xde/frame 0xffffff9185025450
sleepq_set_timeout() at sleepq_set_timeout+0x8b/frame 0xffffff9185025490
_sleep() at _sleep+0x3c1/frame 0xffffff9185025520
usb_pause_mtx() at usb_pause_mtx+0x40/frame 0xffffff9185025540
usbd_transfer_unsetup_sub() at usbd_transfer_unsetup_sub+0x134/frame
0xffffff9185025560
usbd_transfer_unsetup() at usbd_transfer_unsetup+0x19b/frame 0xffffff91850255a0
usbd_ctrl_transfer_setup() at usbd_ctrl_transfer_setup+0x89/frame
0xffffff91850255f0
usbd_do_request_flags() at usbd_do_request_flags+0x327/frame 0xffffff91850256a0
usbd_req_get_desc() at usbd_req_get_desc+0xe4/frame 0xffffff9185025730
usbd_req_get_config_desc() at usbd_req_get_config_desc+0x64/frame
0xffffff9185025780
usbd_req_get_config_desc_full() at usbd_req_get_config_desc_full+0x5a/frame
0xffffff9185025810
usbd_set_config_index() at usbd_set_config_index+0x77/frame 0xffffff91850258b0
usb_alloc_device() at usb_alloc_device+0x6e7/frame 0xffffff91850259d0
uhub_explore() at uhub_explore+0x59b/frame 0xffffff9185025a40
usb_bus_explore() at usb_bus_explore+0xd2/frame 0xffffff9185025a70
usb_process() at usb_process+0xc3/frame 0xffffff9185025aa0
fork_exit() at fork_exit+0x135/frame 0xffffff9185025af0
fork_trampoline() at fork_trampoline+0xe/frame 0xffffff9185025af0
--- trap 0, rip = 0, rsp = 0xffffff9185025bb0, rbp = 0 ---
KDB: enter: panic
[ thread pid 15 tid 100106 ]
Stopped at kdb_enter+0x3b: movq $0,0x7cb632(%rip)