I'm running -CURRENT on a dual PII/400 box with 128M of RAM.  The kernel 
I'm running was built from sources current as of last night (i.e. around
9PM CDT Apr 3).  Just now, while listening to streaming audio with xmms, 
the machine crashed.  It's done that a couple times before, with recent-ish
kernels while doing streaming audio with xmms, but the other times didn't give
core dumps with usable backtraces.  *This* time I got a decent backtrace. 

If I'm reading this backtrace right, the thread handling the sound
hardware called selwakeup() (frame #19).  This called pfind() (frame
#18), which tries to lock allproc.  Somewhere in doing this,
witness_sleep() (frame #15) decides it wants to printf() a message. printf()
calls down into the tty code, which goes into ptsstart() (frame #9) and the
pty code (I'm not entirely sure why). This code then tries to do a selwakeup()
of its own (frame #7) which calls pfind() which tries (again) to lock allproc, 
leading to the "mutex recursed" panic. 

GDB output and (if it matters) kernel config file below. 

Script started on Thu Apr  5 01:12:28 2001
ichotolot# cd /usr/src/sys/compile/ICHOTOLOTSMP
ichotolot# gdb -k kernel.debug /var/crash/vmcore.7
GNU gdb 4.18
Copyright 1998 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-unknown-freebsd"...
IdlePTD 6356992
initial pcb at 513860
panicstr: mutex sx backing lock recursed at ../../kern/kern_condvar.c:198
panic messages:
---
panic: mutex sx backing lock recursed at ../../kern/kern_condvar.c:198
cpuid = 0; lapic.id = 00000000
boot() called on cpu#0

syncing disks... 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 
1: dev:da0s2e, flags:21021024, blkno:11469104, lblkno:11469104
2: dev:da0s2e, flags:21021024, blkno:11468864, lblkno:11468864
3: dev:da0s2e, flags:21000024, blkno:2048, lblkno:2048
4: dev:da0s2e, flags:21021024, blkno:2752848, lblkno:2752848
5: dev:da0s2e, flags:21021024, blkno:2752736, lblkno:2752736
6: dev:da0s2e, flags:21021024, blkno:11468976, lblkno:11468976
7: dev:da0s2a, flags:21021024, blkno:131152, lblkno:131152
8: dev:da0s2e, flags:21021024, blkno:2294176, lblkno:2294176
9: dev:da0s2e, flags:21021024, blkno:2425120, lblkno:2425120
10: dev:da0s2a, flags:21021024, blkno:131184, lblkno:131184
11: dev:da0s2e, flags:21000024, blkno:16, lblkno:16
12: dev:da0s2e, flags:21021024, blkno:2294160, lblkno:2294160
13: dev:da0s2e, flags:21021024, blkno:14221440, lblkno:14221440
14: dev:da0s2e, flags:21021024, blkno:2294192, lblkno:2294192
15: dev:da0s2e, flags:01011024, blkno:11474186, lblkno:0
16: dev:da0s2e, flags:01000024, blkno:11468848, lblkno:11468848
giving up on 16 buffers
Uptime: 23h3m37s

dumping to dev da0s2b, offset 270336
dump 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 
108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 
82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 
53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 
24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 
---
#0  dumpsys () at ../../kern/kern_shutdown.c:478
478             if (dumping++) {
(kgdb) bt
#0  dumpsys () at ../../kern/kern_shutdown.c:478
#1  0xc0251547 in boot (howto=256) at ../../kern/kern_shutdown.c:321
#2  0xc0251a09 in panic (fmt=0xc0464a44 "mutex %s recursed at %s:%d")
    at ../../kern/kern_shutdown.c:592
#3  0xc024aec3 in _mtx_assert (m=0xc054765c, what=9, 
    file=0xc0462932 "../../kern/kern_condvar.c", line=198)
    at ../../kern/kern_mutex.c:602
#4  0xc02369a2 in cv_wait (cvp=0xc0547698, mp=0xc054765c)
    at ../../kern/kern_condvar.c:198
#5  0xc0258caa in _sx_slock (sx=0xc0547640, 
    file=0xc0464e23 "../../kern/kern_proc.c", line=143)
    at ../../kern/kern_sx.c:117
#6  0xc024bf48 in pfind (pid=606) at ../../kern/kern_proc.c:143
#7  0xc026ffe1 in selwakeup (sip=0xc10eea04) at ../../kern/sys_generic.c:1061
#8  0xc027accf in ptcwakeup (tp=0xc10eea20, flag=1) at ../../kern/tty_pty.c:318
#9  0xc027acaa in ptsstart (tp=0xc10eea20) at ../../kern/tty_pty.c:307
#10 0xc0278170 in ttstart (tp=0xc10eea20) at ../../kern/tty.c:1417
#11 0xc027978d in tputchar (c=46, tp=0xc10eea20) at ../../kern/tty.c:2484
#12 0xc0268813 in putchar (c=46, arg=0xc7f12e10) at ../../kern/subr_prf.c:304
#13 0xc0268fb8 in kvprintf (
    fmt=0xc0468642 ":%d: %s with \"%s\" locked from %s:%d\n", 
    func=0xc02687c4 <putchar>, arg=0xc7f12e10, radix=10, ap=0xc7f12e2c "")
    at ../../kern/subr_prf.c:637
#14 0xc0268740 in printf (
    fmt=0xc0468640 "%s:%d: %s with \"%s\" locked from %s:%d\n")
    at ../../kern/subr_prf.c:260
#15 0xc026cff9 in witness_sleep (check_only=0, lock=0xc054765c, 
    file=0xc0462932 "../../kern/kern_condvar.c", line=199)
    at ../../kern/subr_witness.c:725
#16 0xc02369b7 in cv_wait (cvp=0xc0547698, mp=0xc054765c)
    at ../../kern/kern_condvar.c:199
#17 0xc0258caa in _sx_slock (sx=0xc0547640, 
    file=0xc0464e23 "../../kern/kern_proc.c", line=143)
    at ../../kern/kern_sx.c:117
#18 0xc024bf48 in pfind (pid=70414) at ../../kern/kern_proc.c:143
#19 0xc026ffe1 in selwakeup (sip=0xc0f59f54) at ../../kern/sys_generic.c:1061
#20 0xc01f5cea in chn_wakeup (c=0xc0f4d580) at ../../dev/sound/pcm/channel.c:97
#21 0xc01f5e4f in chn_wrfeed (c=0xc0f4d580)
    at ../../dev/sound/pcm/channel.c:188
#22 0xc01f5e75 in chn_wrintr (c=0xc0f4d580)
    at ../../dev/sound/pcm/channel.c:206
#23 0xc01f63dd in chn_intr (c=0xc0f4d580) at ../../dev/sound/pcm/channel.c:407
#24 0xc01df38e in sb_intr (arg=0xc0f4d700) at ../../dev/sound/isa/sb16.c:498
#25 0xc01e12b1 in sbc_intr (p=0xc0f4d9d8) at ../../dev/sound/isa/sbc.c:491
#26 0xc0243823 in ithread_loop (arg=0xc0f4d900) at ../../kern/kern_intr.c:517
#27 0xc0242018 in fork_exit (callout=0xc02433d0 <ithread_loop>, 
    arg=0xc0f4d900, frame=0xc7f12fa8) at ../../kern/kern_fork.c:731
(kgdb) fr 14
#14 0xc0268740 in printf (
    fmt=0xc0468640 "%s:%d: %s with \"%s\" locked from %s:%d\n")
    at ../../kern/subr_prf.c:260
260             retval = kvprintf(fmt, putchar, &pca, 10, ap);
(kgdb) l
255             consintr = 0;
256             va_start(ap, fmt);
257             pca.tty = NULL;
258             pca.flags = TOCONS | TOLOG;
259             pca.pri = -1;
260             retval = kvprintf(fmt, putchar, &pca, 10, ap);
261             va_end(ap);
262             if (!panicstr)
263                     msgbuftrigger = 1;
264             consintr = savintr;             /* reenable interrupts */
(kgdb) fr 15
#15 0xc026cff9 in witness_sleep (check_only=0, lock=0xc054765c, 
    file=0xc0462932 "../../kern/kern_condvar.c", line=199)
    at ../../kern/subr_witness.c:725
725                             printf("%s:%d: %s with \"%s\" locked from %s:%d\n",
(kgdb) l
720                             lock1 = lle->ll_children[i];
721                             if (lock1 == lock || lock1 == &Giant.mtx_object ||
722                                 (lock1->lo_flags & LO_SLEEPABLE))
723                                     continue;
724                             n++;
725                             printf("%s:%d: %s with \"%s\" locked from %s:%d\n",
726                                 file, line, check_only ? "could sleep" : 
"sleeping",
727                                 lock1->lo_name, lock1->lo_file, lock1->lo_line);
728                     }
729             if (lock_list == &p->p_sleeplocks) {
(kgdb) p file
$1 = 0xc0462932 "../../kern/kern_condvar.c"
(kgdb) p line
$2 = 199
(kgdb) p check_only
$3 = 0
(kgdb) p lock1
$4 = (struct lock_object *) 0x0
[Is this supposed to be null? -- rmt]
(kgdb) fr 16
#16 0xc02369b7 in cv_wait (cvp=0xc0547698, mp=0xc054765c)
    at ../../kern/kern_condvar.c:199
199             WITNESS_SLEEP(0, &mp->mtx_object);
(kgdb) fr 17
#17 0xc0258caa in _sx_slock (sx=0xc0547640, 
    file=0xc0464e23 "../../kern/kern_proc.c", line=143)
    at ../../kern/kern_sx.c:117
117                     cv_wait(&sx->sx_shrd_cv, &sx->sx_lock);
(kgdb) fr 18
#18 0xc024bf48 in pfind (pid=70414) at ../../kern/kern_proc.c:143
143             sx_slock(&allproc_lock);
(kgdb) fr 19
#19 0xc026ffe1 in selwakeup (sip=0xc0f59f54) at ../../kern/sys_generic.c:1061
1061            p = pfind(sip->si_pid);
(kgdb) q
ichotolot# cat /usr/src/sys/i386/conf/ICHOTOLOTSMP
#
# GENERIC -- Generic kernel configuration file for FreeBSD/i386
#
# For more information on this file, please read the handbook section on
# Kernel Configuration Files:
#
#    http://www.FreeBSD.org/handbook/kernelconfig-config.html
#
# The handbook is also available locally in /usr/share/doc/handbook
# if you've installed the doc distribution, otherwise always see the
# FreeBSD World Wide Web server (http://www.FreeBSD.org/) for the
# latest information.
#
# An exhaustive list of options and more detailed explanations of the
# device lines is also present in the NOTES configuration file. If you are
# in doubt as to the purpose or necessity of a line, check first in NOTES.
#
# $FreeBSD: src/sys/i386/conf/GENERIC,v 1.306 2001/03/16 11:52:25 sos Exp $

machine         i386
cpu             I686_CPU
ident           GENERIC
maxusers        32

#To statically compile in device wiring instead of /boot/device.hints
#hints          "GENERIC.hints"         #Default places to look for devices.

makeoptions     DEBUG=-g                #Build kernel with gdb(1) debug symbols

options         MATH_EMULATE            #Support for x87 emulation
options         INET                    #InterNETworking
options         INET6                   #IPv6 communications protocols
options         FFS                     #Berkeley Fast Filesystem
options         SOFTUPDATES             #Enable FFS soft updates support
options         MFS                     #Memory Filesystem
options         MD_ROOT                 #MD is a potential root device
options         NFS                     #Network Filesystem
options         NFS_ROOT                #NFS usable as root device, NFS required
options         MSDOSFS                 #MSDOS Filesystem
options         CD9660                  #ISO 9660 Filesystem
options         DEVFS                   #Device Filesystem
options         PROCFS                  #Process filesystem
options         COMPAT_43               #Compatible with BSD 4.3 [KEEP THIS!]
options         SCSI_DELAY=15000        #Delay (in ms) before probing SCSI
options         UCONSOLE                #Allow users to grab the console
options         USERCONFIG              #boot -c editor
options         VISUAL_USERCONFIG       #visual boot -c editor
options         KTRACE                  #ktrace(1) support
options         SYSVSHM                 #SYSV-style shared memory
options         SYSVMSG                 #SYSV-style message queues
options         SYSVSEM                 #SYSV-style semaphores
options         P1003_1B                #Posix P1003_1B real-time extensions
options         _KPOSIX_PRIORITY_SCHEDULING
options         KBD_INSTALL_CDEV        # install a CDEV entry in /dev

# To make an SMP kernel, the next two are needed
options         SMP                     # Symmetric MultiProcessor Kernel
options         APIC_IO                 # Symmetric (APIC) I/O

device          isa
device          eisa
device          pci

# Floppy drives
device          fdc

# ATA and ATAPI devices
device          ata
device          atadisk                 # ATA disk drives
device          atapicd                 # ATAPI CDROM drives
device          atapifd                 # ATAPI floppy drives
device          atapist                 # ATAPI tape drives
options         ATA_STATIC_ID           #Static device numbering

# SCSI Controllers
device          ahb             # EISA AHA1742 family
device          ahc             # AHA2940 and onboard AIC7xxx devices
device          amd             # AMD 53C974 (Tekram DC-390(T))
device          isp             # Qlogic family
#device         ncr             # NCR/Symbios Logic
device          sym             # NCR/Symbios Logic (newer chipsets + those of `ncr')

device          adv             # Advansys SCSI adapters
device          adw             # Advansys wide SCSI adapters
device          aha             # Adaptec 154x SCSI adapters
device          aic             # Adaptec 15[012]x SCSI adapters, AIC-6[23]60.
device          bt              # Buslogic/Mylex MultiMaster SCSI adapters

device          ncv             # NCR 53C500
device          nsp             # Workbit Ninja SCSI-3
device          stg             # TMC 18C30/18C50

# RAID controllers interfaced to the SCSI subsystem
device          asr             # DPT SmartRAID V, VI and Adaptec SCSI RAID
device          dpt             # DPT Smartcache III, IV - See NOTES for options!
device          mly             # Mylex AcceleRAID/eXtremeRAID

# SCSI peripherals
device          scbus           # SCSI bus (required)
device          da              # Direct Access (disks)
device          sa              # Sequential Access (tape etc)
device          cd              # CD
device          pass            # Passthrough device (direct SCSI access)

# RAID controllers
device          aac             # Adaptec FSA RAID
device          amr             # AMI MegaRAID
device          ida             # Compaq Smart RAID
device          mlx             # Mylex DAC960 family
device          twe             # 3ware ATA RAID

# atkbdc0 controls both the keyboard and the PS/2 mouse
device          atkbdc  1       # At keyboard controller
device          atkbd           # at keyboard
device          psm             # psm mouse

device          vga             # VGA screen

# splash screen/screen saver
device          splash

# syscons is the default console driver, resembling an SCO console
device          sc      1

# Enable this for the pcvt (VT220 compatible) console driver
#device         vt
#options        XSERVER                 # support for X server on a vt console
#options        FAT_CURSOR              # start with block cursor
# If you have a ThinkPAD, uncomment this along with the rest of the PCVT lines
#options        PCVT_SCANSET=2          # IBM keyboards are non-std

# Floating point support - do not disable.
device          npx

# Power management support (see NOTES for more options)
device          apm
# Add suspend/resume support for the i8254.
device          pmtimer

# Audio support
device          pcm

# PCCARD (PCMCIA) support
device          card            # pccard bus
device          pcic            # PCMCIA bridge

# Serial (COM) ports
device          sio             # 8250, 16[45]50 based serial ports

# Parallel port
device          ppc
device          ppbus           # Parallel port bus (required)
device          lpt             # Printer
device          plip            # TCP/IP over parallel
device          ppi             # Parallel port interface device
#device         vpo             # Requires scbus and da


# PCI Ethernet NICs.
device          de              # DEC/Intel DC21x4x (``Tulip'')
device          vx              # 3Com 3c590, 3c595 (``Vortex'')
device          wx              # Intel Gigabit Ethernet Card (``Wiseman'')

# PCI Ethernet NICs that use the common MII bus controller code.
# NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
device          miibus          # MII bus support
device          dc              # DEC/Intel 21143 and various workalikes
device          fxp             # Intel EtherExpress PRO/100B (82557, 82558)
device          pcn             # AMD Am79C79x PCI 10/100 NICs
device          rl              # RealTek 8129/8139
device          sf              # Adaptec AIC-6915 (``Starfire'')
device          sis             # Silicon Integrated Systems SiS 900/SiS 7016
device          ste             # Sundance ST201 (D-Link DFE-550TX)
device          tl              # Texas Instruments ThunderLAN
device          tx              # SMC EtherPower II (83c170 ``EPIC'')
device          vr              # VIA Rhine, Rhine II
device          wb              # Winbond W89C840F
device          xl              # 3Com 3c90x (``Boomerang'', ``Cyclone'')

# ISA Ethernet NICs.  pccard nics included.
device          cs              # Crystal Semiconductor CS89x0 NIC
# 'device ed' requires 'device miibus'
device          ed              # NE[12]000, SMC Ultra, 3c503, DS8390 cards
device          ex              # Intel EtherExpress Pro/10 and Pro/10+
device          ep              # Etherlink III based cards
device          fe              # Fujitsu MB8696x based cards
device          sn              # SMC's 9000 series of ethernet chips
device          xe              # Xircom pccard ethernet

# The probe order of these is presently determined by i386/isa/isa_compat.c.
#device         ie
#device         le
device          lnc

# Wireless NIC cards
device          an              # Aironet 4500/4800 802.11 wireless NICs. 
device          awi             # BayStack 660 and others
device          wi              # WaveLAN/IEEE 802.11 wireless NICs. 
#device         wl              # Older non 802.11 Wavelan wireless NIC.

# Pseudo devices - the number indicates how many units to allocate.
device          random          # Entropy device
device          loop            # Network loopback
device          ether           # Ethernet support
device          sl              # Kernel SLIP
device          ppp     1       # Kernel PPP
device          tun             # Packet tunnel.
device          pty             # Pseudo-ttys (telnet etc)
device          md              # Memory "disks"
device          gif     4       # IPv6 and IPv4 tunneling
device          faith   1       # IPv6-to-IPv4 relaying (translation)

# The `bpf' device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
device          bpf             # Berkeley packet filter

# USB support
device          uhci            # UHCI PCI->USB interface
device          ohci            # OHCI PCI->USB interface
device          usb             # USB Bus (required)
#device         udbp            # USB Double Bulk Pipe devices
device          ugen            # Generic
device          uhid            # "Human Interface Devices"
device          ukbd            # Keyboard
device          ulpt            # Printer
device          umass           # Disks/Mass storage - Requires scbus and da
device          ums             # Mouse
device          urio            # Diamond Rio 500 MP3 player
device          uscanner        # Scanners
# USB Ethernet, requires mii
device          aue             # ADMtek USB ethernet
device          cue             # CATC USB ethernet
device          kue             # Kawasaki LSI USB ethernet
device sbc
options INVARIANTS
options INVARIANT_SUPPORT
options IPSEC
options IPSEC_ESP
options DDB
options DDB_UNATTENDED
options WITNESS
options DIAGNOSTIC
ichotolot# 

Script done on Thu Apr  5 01:17:50 2001

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