On Wed, Apr 27, 2005 at 08:01:28PM +0200, Rene Ladan wrote: > Hi, > > I experienced this new fxp LOR (probably when ntpd started during boot):
[snip 2 LORs]
> The box panics with automatic dump and reboot:
>
> KDB: enter: witness_checkorder
> panic: blockable sleep lock (sleep mutex) tty @
> /usr/src/sys/kern/kern_event.c:1495
> KDB: stack backtrace:
> Uptime: 15m33s
> Dumping 191 MB
> 16 32 48 64 80 96 112 128 144 160 176
> Dump complete
Some dump analysis (especially frames 34 and 35 look interesting):
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so:
Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
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Type "show copying" to see the conditions.
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This GDB was configured as "i386-marcel-freebsd".
#0 doadump () at pcpu.h:159
159 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) bt f
#0 doadump () at pcpu.h:159
No locals.
#1 0xc04948aa in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:410
first_buf_printf = 1
#2 0xc0494c18 in panic (
fmt=0xc05fcf6f "blockable sleep lock (%s) %s @ %s:%d")
at /usr/src/sys/kern/kern_shutdown.c:566
td = (struct thread *) 0xc13e7180
bootopt = 256
newpanic = 1
ap = 0xc9be56a8 "{Â`ÃÃÃ_Ã~l_ÃÃ\005"
buf = "blockable sleep lock (sleep mutex) tty @
/usr/src/sys/kern/kern_event.c:1495", '\0' <repeats 179 times>
#3 0xc04bb5ae in witness_checkorder (lock=0xc158c510, flags=9,
file=0xc05f6c7e "/usr/src/sys/kern/kern_event.c", line=1495)
at /usr/src/sys/kern/subr_witness.c:709
lock_list = (struct lock_list_entry **) 0x15
lle = (struct lock_list_entry *) 0xc9be56fc
lock1 = (struct lock_instance *) 0xc13e7180
lock2 = (struct lock_instance *) 0x0
class = (struct lock_class *) 0xc0620ffc
w = (struct witness *) 0xc0649468
w1 = (struct witness *) 0x20
td = (struct thread *) 0xc13e7180
---Type <return> to continue, or q <return> to quit---
i = 1923
j = -1066895508
__func__ = "witness_checkorder"
#4 0xc048a95a in _mtx_lock_flags (m=0xc158c510, opts=0,
file=0xc05f6c7e "/usr/src/sys/kern/kern_event.c", line=1495)
at /usr/src/sys/kern/kern_mutex.c:271
No locals.
#5 0xc0476ff5 in knote (list=0xc158c498, hint=0, islocked=0)
at /usr/src/sys/kern/kern_event.c:1495
kq = (struct kqueue *) 0xc158c438
kn = (struct knote *) 0xc158c400
#6 0xc04c98ae in ttwwakeup (tp=0xc158c400) at /usr/src/sys/kern/tty.c:2398
No locals.
#7 0xc05baf21 in scstart (tp=0xc158c400)
at /usr/src/sys/dev/syscons/syscons.c:1369
rbp = (struct clist *) 0xc158c438
len = 0
buf =
"lwhÃ\204\a\000\000\000p\000\000`whÃâWÅÃBk[ÃlwhÃ\204\a\000\000
\000\000\000\000p\000\000BK\000 \224WÅÃ\032\205[Ã
ÂhÃlwhÃ`whÃ\000\017\000\000ÃWÅÃul[Ã`whÃ\204\a\000\000
\000\000\000\000\017\000\000\000\000\000\000`whÃ`whÃ
ÂhÃÃWÅÃÃÃ[Ã`whÃ\204\a\000\000\000\000\000"
scp = (scr_stat *) 0xc0687760
#8 0xc05be305 in scgetc (sc=0xc068aa20, flags=3)
at /usr/src/sys/dev/syscons/syscons.c:3211
---Type <return> to continue, or q <return> to quit---
scp = (scr_stat *) 0xc0687760
tp = (struct tty *) 0x0
c = 6
this_scr = -910272488
f = 0
i = 0
#9 0xc05bb379 in sccngetch (flags=2)
at /usr/src/sys/dev/syscons/syscons.c:1555
fkey = {str = '\0' <repeats 15 times>, len = 0 '\0'}
fkeycp = 0
scp = (scr_stat *) 0xc0687760
p = (u_char *) 0x0
cur_mode = 1
c = -1067201760
#10 0xc05bb1c2 in sccncheckc (cd=0xc06350e0)
at /usr/src/sys/dev/syscons/syscons.c:1478
No locals.
#11 0xc04cc1f8 in cncheckc () at /usr/src/sys/kern/tty_cons.c:567
cnd = (struct cn_device *) 0xc066d0e0
cn = (struct consdev *) 0x0
c = 0
#12 0xc04cc1a5 in cngetc () at /usr/src/sys/kern/tty_cons.c:548
c = 0
#13 0xc042a765 in db_readline (lstart=0xc063cb20 "c\n", lsize=120)
---Type <return> to continue, or q <return> to quit---
at /usr/src/sys/ddb/db_input.c:324
No locals.
#14 0xc042a8aa in db_read_line () at /usr/src/sys/ddb/db_lex.c:55
i = 0
#15 0xc0428fc1 in db_command_loop () at /usr/src/sys/ddb/db_command.c:453
No locals.
#16 0xc042b125 in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_main.c:221
jb = {{_jb = {-910272284, -910272312, -910272232, -1052872320, 0,
-1069371194, 0, 0, 0, 0, -910272232, -1068823136}}}
prev_jb = (void *) 0x0
bkpt = 0
#17 0xc04b0e27 in kdb_trap (type=0, code=0, tf=0xc9be5978)
at /usr/src/sys/kern/subr_kdb.c:418
handled = -910272136
#18 0xc05d9428 in trap (frame=
{tf_fs = -1051983848, tf_es = 16, tf_ds = -910295024, tf_edi = 9, tf_esi
= -1051950492, tf_ebp = -910272064, tf_isp = -910272092, tf_ebx = -1067004164,
tf_edx = 1, tf_ecx = -1056878592, tf_eax = 31, tf_trapno = 3, tf_err = 0,
tf_eip = -1068823776, tf_cs = 8, tf_eflags = 646, tf_esp = -1067468212, tf_ss =
-1067537639}) at /usr/src/sys/i386/i386/trap.c:576
td = (struct thread *) 0xc13e7180
p = (struct proc *) 0xc13e654c
sticks = 0
i = 0
---Type <return> to continue, or q <return> to quit---
ucode = 0
type = 3
code = 0
eva = 0
#19 0xc05c880a in calltrap () at /usr/src/sys/i386/i386/exception.s:140
No locals.
#20 0xc14c0018 in ?? ()
No symbol table info available.
#21 0x00000010 in ?? ()
No symbol table info available.
#22 0xc9be0010 in ?? ()
No symbol table info available.
#23 0x00000009 in ?? ()
No symbol table info available.
#24 0xc14c8264 in ?? ()
No symbol table info available.
#25 0xc9be59c0 in ?? ()
No symbol table info available.
#26 0xc9be59a4 in ?? ()
No symbol table info available.
#27 0xc066cefc in w_locklistdata ()
No symbol table info available.
#28 0x00000001 in ?? ()
No symbol table info available.
---Type <return> to continue, or q <return> to quit---
#29 0xc1015000 in ?? ()
No symbol table info available.
#30 0x0000001f in ?? ()
No symbol table info available.
#31 0x00000003 in ?? ()
No symbol table info available.
#32 0x00000000 in ?? ()
No symbol table info available.
#33 0xc04b0b20 in kdb_enter (msg=0x0) at cpufunc.h:56
No locals.
#34 0xc04bbbab in witness_checkorder (lock=0xc14c8264, flags=9,
file=0xc06fe7bd "/usr/src/sys/modules/fxp/../../dev/fxp/if_fxp.c",
line=1232) at /usr/src/sys/kern/subr_witness.c:946
lock_list = (struct lock_list_entry **) 0xc13e71f0
lle = (struct lock_list_entry *) 0xc066cef8
lock1 = (struct lock_instance *) 0xc066cefc
lock2 = (struct lock_instance *) 0x0
class = (struct lock_class *) 0xc0620ffc
w = (struct witness *) 0xc0649530
w1 = (struct witness *) 0xc064a778
td = (struct thread *) 0xc066cefc
i = -1
j = 0
__func__ = "witness_checkorder"
---Type <return> to continue, or q <return> to quit---
#35 0xc048a95a in _mtx_lock_flags (m=0xc14c8264, opts=0,
file=0xc06fe7bd "/usr/src/sys/modules/fxp/../../dev/fxp/if_fxp.c",
line=1232) at /usr/src/sys/kern/kern_mutex.c:271
No locals.
#36 0xc06fbdc7 in ?? ()
No symbol table info available.
#37 0xc14c8264 in ?? ()
No symbol table info available.
#38 0x00000000 in ?? ()
No symbol table info available.
#39 0xc06fe7bd in ?? ()
No symbol table info available.
#40 0x000004d0 in ?? ()
No symbol table info available.
#41 0xc14c8000 in ?? ()
No symbol table info available.
#42 0xc14c8000 in ?? ()
No symbol table info available.
#43 0xc9be5a70 in ?? ()
No symbol table info available.
#44 0xc050b1c9 in if_start (ifp=0xc14c8264) at /usr/src/sys/net/if.c:1959
No locals.
Previous frame identical to this frame (corrupt stack?)
(kgdb) frame 33
#33 0xc04b0b20 in kdb_enter (msg=0x0) at cpufunc.h:56
56 cpufunc.h: No such file or directory.
in cpufunc.h
(kgdb) frame 34
#34 0xc04bbbab in witness_checkorder (lock=0xc14c8264, flags=9,
file=0xc06fe7bd "/usr/src/sys/modules/fxp/../../dev/fxp/if_fxp.c",
line=1232) at /usr/src/sys/kern/subr_witness.c:946
946 kdb_enter(__func__);
(kgdb) frame 35
#35 0xc048a95a in _mtx_lock_flags (m=0xc14c8264, opts=0,
file=0xc06fe7bd "/usr/src/sys/modules/fxp/../../dev/fxp/if_fxp.c",
line=1232) at /usr/src/sys/kern/kern_mutex.c:271
271 WITNESS_CHECKORDER(&m->mtx_object, opts | LOP_NEWORDER |
LOP_EXCLUSIVE,
(kgdb) print *m
$1 = {mtx_object = {lo_class = 0xc0620ffc, lo_name = 0xc14a57e0 "fxp0",
lo_type = 0xc06fe820 "network driver", lo_flags = 196608, lo_list = {
tqe_next = 0xc14c8208, tqe_prev = 0xc14bf010},
lo_witness = 0xc0649530}, mtx_lock = 4, mtx_recurse = 0}
(kgdb) q
I still have this dump (~65MB uncompressed) available.
> This is on:
>
> FreeBSD 5.4-STABLE #0: Tue Apr 26 07:30:25 CEST 2005 [EMAIL
> PROTECTED]:/usr/obj/usr/src/sys/RENE
>
Regards,
Rene
--
"It won't fit on the line."
-- me, 2001
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