GENERIC 7.0-CURRENT from Aug 28 07:16 UTC, vmcore.11

Page fault in kern/tty_subr.c:418 Looks a lot like the problem reported in
http://people.freebsd.org/~pho/stress/log/cons152.html

GDB: no debug ports present
KDB: debugger backends: ddb
KDB: current backend: ddb
Copyright (c) 1992-2005 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD 7.0-CURRENT #5: Sun Aug 28 09:26:20 CEST 2005
    pho@crashbox.osted.lan:/usr/src/sys/i386/compile/PHO
WARNING: WITNESS option enabled, expect reduced performance.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) XEON(TM) CPU 1.80GHz (1799.81-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf24  Stepping = 4
  Features=0x3febfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM>
  Hyperthreading: 2 logical CPUs
real memory  = 532361216 (507 MB)
avail memory = 511131648 (487 MB)
:
Trying to mount root from ufs:/dev/ad0s1a
fxp0: link state changed to UP


Fatal trap 12: page fault while in kernel mode
cpuid = 3; apic id = 07
fault virtual address   = 0x0
fault code              = supervisor write, page not present
instruction pointer     = 0x20:0xc0669182
stack pointer           = 0x28:0xd6ac48d8
frame pointer           = 0x28:0xd6ac48e4
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 583 (bash)
[thread pid 583 tid 100171 ]
Stopped at      putc+0x16e:     movb    %dl,0(%eax)
db> where
Tracing pid 583 tid 100171 td 0xc1da4600
putc(2e,c1b5d838) at putc+0x16e
ttyoutput(2e,c1b5d800,2,d6ac4a10,d6ac4930) at ttyoutput+0x15c
tputchar(2e,c1b5d800) at tputchar+0x2f
putchar(2e,d6ac4a10) at putchar+0x68
kvprintf(c085ed39,c064de2c,d6ac4a10,a,d6ac4a38) at kvprintf+0x6c6
uprintf(c085ed39,d43710d4) at uprintf+0xf3
exec_elf32_imgact(d6ac4be4,c08c7ba4,0,0,0) at exec_elf32_imgact+0x4e7
do_execve(c1da4600,d6ac4cb4,0,0,d6ac4cb4) at do_execve+0x21a
kern_execve(c1da4600,d6ac4cb4,0,d1d59000,d1d59000) at kern_execve+0x74
execve(c1da4600,d6ac4d04,3,0,286) at execve+0x32
syscall(80e003b,3b,bfbf003b,80e0940,0) at syscall+0x22f
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (59, FreeBSD ELF32, execve), eip = 0x281abd13, esp = 0xbfbfe85c, ebp = 0xbfbfe948 ---
db> show pcpu 3
cpuid        = 3
curthread    = 0xc1da4600: pid 583 "bash"
curpcb       = 0xd6ac4d90
fpcurthread  = none
idlethread   = 0xc19c7780: pid 11 "idle: cpu3"
APIC ID      = 7
currentldt   = 0x50
spin locks held:
db> show pcpu 1
cpuid        = 1
curthread    = 0xc19c7a80: pid 13 "idle: cpu1"
curpcb       = 0xd42cfd90
fpcurthread  = none
idlethread   = 0xc19c7a80: pid 13 "idle: cpu1"
APIC ID      = 1
currentldt   = 0x50
spin locks held:
db> show pcpu 0
cpuid        = 0
curthread    = 0xc19c7c00: pid 14 "idle: cpu0"
curpcb       = 0xd42d2d90
fpcurthread  = none
idlethread   = 0xc19c7c00: pid 14 "idle: cpu0"
APIC ID      = 0
currentldt   = 0x50
spin locks held:
db> show pcpu 2
cpuid        = 2
curthread    = 0xc19c7900: pid 12 "idle: cpu2"
curpcb       = 0xd42ccd90
fpcurthread  = none
idlethread   = 0xc19c7900: pid 12 "idle: cpu2"
APIC ID      = 6
currentldt   = 0x50
spin locks held:
db> show alllocks
db> ps
  pid   proc     uid  ppid  pgrp  flag   stat  wmesg    wchan  cmd
  583 c1da9624 1001   562   583 4000002 [CPU 3] bash
  562 c1ed6418 1001   561   562 0004002 [SLPQ wait 0xc1ed6418][SLP] bash
  561 c1da9a3c 1001   559   559 0000100 [SLPQ select 0xc09ae884][SLP] sshd
  559 c1da3830    0   445   559 0004100 [SLPQ sbwait 0xc20ce638][SLP] sshd
  558 c1daa000 1001   552   558 0004002 [SLPQ kqread 0xc1d8a200][SLP] tail
  552 c1daa624 1001   551   552 0004002 [SLPQ wait 0xc1daa624][SLP] bash
  551 c1da3418 1001   549   549 0000100 [SLPQ select 0xc09ae884][SLP] sshd
  549 c1d76a3c    0   445   549 0004100 [SLPQ sbwait 0xc1e454d4][SLP] sshd
  548 c1d76830 1001   542   548 0004002 [SLPQ select 0xc09ae884][SLP] top
  542 c1d7520c 1001   541   542 0004002 [SLPQ wait 0xc1d7520c][SLP] bash
  541 c1d26000 1001   539   539 0000100 [SLPQ select 0xc09ae884][SLP] sshd
  539 c1ed6830    0   445   539 0004100 [SLPQ sbwait 0xc1e550a8][SLP] sshd
  538 c1d76624    0     1   538 0004002 [SLPQ ttyin 0xc1be1810][SLP] getty
  537 c1d26624    0     1   537 0004002 [SLPQ ttyin 0xc1bdfc10][SLP] getty
  536 c1d24a3c    0     1   536 0004002 [SLPQ ttyin 0xc1bdf810][SLP] getty
  535 c1d75000    0     1   535 0004002 [SLPQ ttyin 0xc1be0810][SLP] getty
  534 c1daa20c    0     1   534 0004002 [SLPQ ttyin 0xc1be0410][SLP] getty
  533 c1d26418    0     1   533 0004002 [SLPQ ttyin 0xc1bddc10][SLP] getty
  532 c1d24624    0     1   532 0004002 [SLPQ ttyin 0xc1bdf010][SLP] getty
  531 c1ed7000    0     1   531 0004002 [SLPQ ttyin 0xc1bdf410][SLP] getty
  467 c1d6f830    0     1   467 0000000 [SLPQ nanslp 0xc096156c][SLP] cron
  455 c1d24418   25     1   455 0000100 [SLPQ pause 0xc1d2444c][SLP] sendmail
  451 c1da9000    0     1   451 0000100 [SLPQ select 0xc09ae884][SLP] sendmail
  445 c1d82418    0     1   445 0000100 [SLPQ select 0xc09ae884][SLP] sshd
  401 c1d24c48    0     1   401 0000000 [SLPQ select 0xc09ae884][SLP] usbd
  310 c1d8220c    0     1   310 0000000 [SLPQ select 0xc09ae884][SLP] devd
  279 c1b23624    0     1   279 0000000 [SLPQ select 0xc09ae884][SLP] syslogd
  108 c1a7620c    0     0     0 0000204 [SLPQ - 0xd556bd04][SLP] schedcpu
  107 c1a76418    0     0     0 0000204 [SLPQ - 0xc09b6f4c][SLP] nfsiod 3
  106 c1a76624    0     0     0 0000204 [SLPQ - 0xc09b6f48][SLP] nfsiod 2
  105 c1a76830    0     0     0 0000204 [SLPQ - 0xc09b6f44][SLP] nfsiod 1
  104 c1a76a3c    0     0     0 0000204 [SLPQ - 0xc09b6f40][SLP] nfsiod 0
  103 c1a76c48    0     0     0 0000204 [SLPQ vlruwt 0xc1a76c48][SLP] vnlru
  102 c1b22000    0     0     0 0000204 [SLPQ syncer 0xc09612e0][SLP] syncer
  101 c1b2220c    0     0     0 0000204 [SLPQ psleep 0xc09aedcc][SLP] bufdaemon
  100 c1b22418    0     0     0 000020c [SLPQ pgzero 0xc09bd504][SLP] pagezero
   99 c1b22624    0     0     0 0000204 [SLPQ psleep 0xc09bd054][SLP] vmdaemon
   98 c1b22830    0     0     0 0000204 [SLPQ psleep 0xc09bd010][SLP] pagedaemon
   97 c1b22a3c    0     0     0 0000204 [SLPQ - 0xc19b963c][SLP] fdc0
   96 c1b22c48    0     0     0 0000204 [IWAIT] swi0: sio
   95 c1b23000    0     0     0 0000204 [SLPQ usbtsk 0xc0928204][SLP] usbtask
   94 c1b2320c    0     0     0 0000204 [SLPQ usbevt 0xc1b27210][SLP] usb0
    9 c1b23418    0     0     0 0000204 [SLPQ - 0xc1a4c980][SLP] kqueue taskq
    8 c1a70000    0     0     0 0000204 [SLPQ - 0xc1a4ca00][SLP] acpi_task2
    7 c1a7020c    0     0     0 0000204 [SLPQ - 0xc1a4ca00][SLP] acpi_task1
    6 c1a70418    0     0     0 0000204 [SLPQ - 0xc1a4ca00][SLP] acpi_task0
   93 c1a70624    0     0     0 0000204 [IWAIT] swi2: cambio
   92 c1a70830    0     0     0 0000204 [IWAIT] swi5:+
    5 c1a70a3c    0     0     0 0000204 [SLPQ - 0xc1a4cc80][SLP] thread taskq
   91 c1a70c48    0     0     0 0000204 [IWAIT] swi6:+
   90 c1a75000    0     0     0 0000204 [IWAIT] swi6: task queue
   89 c1a7520c    0     0     0 0000204 [SLPQ - 0xc0925f20][SLP] yarrow
    4 c1a75418    0     0     0 0000204 [SLPQ - 0xc092aa28][SLP] g_down
    3 c1a75624    0     0     0 0000204 [SLPQ - 0xc092aa24][SLP] g_up
    2 c1a75830    0     0     0 0000204 [SLPQ - 0xc092aa1c][SLP] g_event
   88 c1a75a3c    0     0     0 0000204 [IWAIT] swi3: vm
   87 c1a75c48    0     0     0 000020c [IWAIT] swi4: clock sio
   86 c1a76000    0     0     0 0000204 [IWAIT] swi1: net
   85 c1a5b000    0     0     0 0000204 [IWAIT] irq71:
   84 c1a5b20c    0     0     0 0000204 [IWAIT] irq70:
   83 c1a5b418    0     0     0 0000204 [IWAIT] irq69:
   82 c1a5b624    0     0     0 0000204 [IWAIT] irq68:
   81 c1a5b830    0     0     0 0000204 [IWAIT] irq67:
   80 c1a5ba3c    0     0     0 0000204 [IWAIT] irq66:
   79 c1a5bc48    0     0     0 0000204 [IWAIT] irq65:
   78 c1a60000    0     0     0 0000204 [IWAIT] irq64:
   77 c1a6020c    0     0     0 0000204 [IWAIT] irq63:
   76 c1a60418    0     0     0 0000204 [IWAIT] irq62:
   75 c1a60624    0     0     0 0000204 [IWAIT] irq61:
   74 c1a60830    0     0     0 0000204 [IWAIT] irq60:
   73 c1a60a3c    0     0     0 0000204 [IWAIT] irq59:
   72 c1a60c48    0     0     0 0000204 [IWAIT] irq58:
   71 c1a3b20c    0     0     0 0000204 [IWAIT] irq57:
   70 c1a3b418    0     0     0 0000204 [IWAIT] irq56:
   69 c1a3b624    0     0     0 0000204 [IWAIT] irq55:
   68 c1a3b830    0     0     0 0000204 [IWAIT] irq54:
   67 c1a3ba3c    0     0     0 0000204 [IWAIT] irq53:
   66 c1a3bc48    0     0     0 0000204 [IWAIT] irq52:
   65 c1a4d000    0     0     0 0000204 [IWAIT] irq51:
   64 c1a4d20c    0     0     0 0000204 [IWAIT] irq50:
   63 c1a4d418    0     0     0 0000204 [IWAIT] irq49:
   62 c1a4d624    0     0     0 0000204 [IWAIT] irq48: em0
   61 c1a4d830    0     0     0 0000204 [IWAIT] irq47:
   60 c1a4da3c    0     0     0 0000204 [IWAIT] irq46:
   59 c1a4dc48    0     0     0 0000204 [IWAIT] irq45:
   58 c1a2c624    0     0     0 0000204 [IWAIT] irq44:
   57 c1a2c830    0     0     0 0000204 [IWAIT] irq43:
   56 c1a2ca3c    0     0     0 0000204 [IWAIT] irq42:
   55 c1a2cc48    0     0     0 0000204 [IWAIT] irq41:
   54 c1a3a000    0     0     0 0000204 [IWAIT] irq40:
   53 c1a3a20c    0     0     0 0000204 [IWAIT] irq39:
   52 c1a3a418    0     0     0 0000204 [IWAIT] irq38:
   51 c1a3a624    0     0     0 0000204 [IWAIT] irq37:
   50 c1a3a830    0     0     0 0000204 [IWAIT] irq36:
   49 c1a3aa3c    0     0     0 0000204 [IWAIT] irq35:
   48 c1a3ac48    0     0     0 0000204 [IWAIT] irq34:
   47 c1a3b000    0     0     0 0000204 [IWAIT] irq33:
   46 c1a14c48    0     0     0 0000204 [IWAIT] irq32:
   45 c1a2b000    0     0     0 0000204 [IWAIT] irq31:
   44 c1a2b20c    0     0     0 0000204 [IWAIT] irq30:
   43 c1a2b418    0     0     0 0000204 [IWAIT] irq29:
   42 c1a2b624    0     0     0 0000204 [IWAIT] irq28:
   41 c1a2b830    0     0     0 0000204 [IWAIT] irq27:
   40 c1a2ba3c    0     0     0 0000204 [IWAIT] irq26:
   39 c1a2bc48    0     0     0 0000204 [IWAIT] irq25:
   38 c1a2c000    0     0     0 0000204 [IWAIT] irq24:
   37 c1a2c20c    0     0     0 0000204 [IWAIT] irq23:
   36 c1a2c418    0     0     0 0000204 [IWAIT] irq22:
   35 c1a0a624    0     0     0 0000204 [IWAIT] irq21:
   34 c1a0a830    0     0     0 0000204 [IWAIT] irq20:
   33 c1a0aa3c    0     0     0 0000204 [IWAIT] irq19:
   32 c1a0ac48    0     0     0 0000204 [IWAIT] irq18:
   31 c1a14000    0     0     0 0000204 [IWAIT] irq17: fxp0
   30 c1a1420c    0     0     0 0000204 [IWAIT] irq16: uhci0
   29 c1a14418    0     0     0 0000204 [IWAIT] irq15: ata1
   28 c1a14624    0     0     0 0000204 [IWAIT] irq14: ata0
   27 c1a14830    0     0     0 0000204 [IWAIT] irq13:
   26 c1a14a3c    0     0     0 0000204 [IWAIT] irq12:
   25 c19cb20c    0     0     0 0000204 [IWAIT] irq11:
   24 c19cb418    0     0     0 0000204 [IWAIT] irq10:
   23 c19cb624    0     0     0 0000204 [IWAIT] irq9: acpi0
   22 c19cb830    0     0     0 0000204 [IWAIT] irq8:
   21 c19cba3c    0     0     0 0000204 [IWAIT] irq7: ppc0
   20 c19cbc48    0     0     0 0000204 [IWAIT] irq6: fdc0
   19 c1a0a000    0     0     0 0000204 [IWAIT] irq5:
   18 c1a0a20c    0     0     0 0000204 [IWAIT] irq4: sio0
   17 c1a0a418    0     0     0 0000204 [IWAIT] irq3: sio1
   16 c19c6000    0     0     0 0000204 [IWAIT] irq0:
   15 c19c620c    0     0     0 0000204 [IWAIT] irq1: atkbd0
   14 c19c6418    0     0     0 000020c [CPU 0] idle: cpu0
   13 c19c6624    0     0     0 000020c [CPU 1] idle: cpu1
   12 c19c6830    0     0     0 000020c [CPU 2] idle: cpu2
   11 c19c6a3c    0     0     0 000020c [Can run] idle: cpu3
    1 c19c6c48    0     0     1 0004200 [SLPQ wait 0xc19c6c48][SLP] init
   10 c19cb000    0     0     0 0000204 [SLPQ ktrace 0xc095f4b8][SLP] ktrace
    0 c092ab20    0     0     0 0000200 [IWAIT] swapper
db> call doadump
Dumping 507 MB (2 chunks)
  chunk 0: 1MB (159 pages) ... ok
  chunk 1: 507MB (129715 pages) 491 475 459 443 427 411 395 379 363 347 331 315 299 283 267 251 235 219 203 187 171 155 139 123 107 91 75 59 43 27 11 ... ok

Dump complete
= 0xf
db> reset

(kgdb) bt
#0  doadump () at pcpu.h:165
#1  0xc04696cb in db_fncall (dummy1=0x0, dummy2=0x0, dummy3=0x0, dummy4=0xd6ac46fc "(G<}\024G\030G\220\a")
    at ../../../ddb/db_command.c:486
#2  0xc04694d0 in db_command (last_cmdp=0xc0911b04, cmd_table=0x0, aux_cmd_tablep=0xc088dfbc, aux_cmd_tablep_end=0xc088dfd8)
    at ../../../ddb/db_command.c:401
#3  0xc0469598 in db_command_loop () at ../../../ddb/db_command.c:452
#4  0xc046b13d in db_trap (type=0xc, code=0x0) at ../../../ddb/db_main.c:228
#5  0xc064c568 in kdb_trap (type=0xc, code=0x0, tf=0xd6ac4898) at ../../../kern/subr_kdb.c:473
#6  0xc07f802c in trap_fatal (frame=0xd6ac4898, eva=0x0) at ../../../i386/i386/trap.c:832
#7  0xc07f7d73 in trap_pfault (frame=0xd6ac4898, usermode=0x0, eva=0x0) at ../../../i386/i386/trap.c:752
#8  0xc07f79bd in trap (frame=
      {tf_fs = 0x8, tf_es = 0xc2040028, tf_ds = 0xd6ac0028, tf_edi = 0x36, tf_esi = 0xc1b5d838, tf_ebp = 0xd6ac48e4, tf_isp = 0xd6ac48c4, tf_ebx = 0xc20d4d80, tf_edx = 0x2e, tf_ecx = 0x2, tf_eax = 0x0, tf_trapno = 0xc, tf_err = 0x2, tf_eip = 0xc0669182, tf_cs = 0x20, tf_eflags = 0x10246, tf_esp = 0x2e, tf_ss = 0xc1b5d800}) at ../../../i386/i386/trap.c:442
#9  0xc07e55fa in calltrap () at ../../../i386/i386/exception.s:139
:
#23 0xc0669182 in putc (chr=0x2e, clistp=0xc1b5d838) at ../../../kern/tty_subr.c:418
#24 0xc06627b4 in ttyoutput (c=0x2e, tp=0xc1b5d800) at ../../../kern/tty.c:760
#25 0xc066580f in tputchar (c=0x2e, tp=0xc1b5d800) at ../../../kern/tty.c:2753
#26 0xc064de94 in putchar (c=0x2e, arg=0xd6ac4a10) at ../../../kern/subr_prf.c:341
#27 0xc064e722 in kvprintf (fmt=0xc085ed4b " not found\n", func=0xc064de2c <putchar>, arg=0xd6ac4a10, radix=0xa, ap=0xd6ac4a38 "")
    at ../../../kern/subr_prf.c:685
#28 0xc064dadb in uprintf (fmt=0xc085ed39 "ELF interpreter %s not found\n") at ../../../kern/subr_prf.c:149
#29 0xc060bf57 in exec_elf32_imgact (imgp=0xd6ac4be4) at ../../../kern/imgact_elf.c:839
#30 0xc061d462 in do_execve (td=0xc1da4600, args=0x0, mac_p=0x0) at ../../../kern/kern_exec.c:410
#31 0xc061d1e8 in kern_execve (td=0xc1da4600, args=0xd6ac4cb4, mac_p=0x0) at ../../../kern/kern_exec.c:251
#32 0xc061d14e in execve (td=0xc1da4600, uap=0x0) at ../../../kern/kern_exec.c:186
#33 0xc07f831b in syscall (frame=
      {tf_fs = 0x80e003b, tf_es = 0x3b, tf_ds = 0xbfbf003b, tf_edi = 0x80e0940, tf_esi = 0x0, tf_ebp = 0xbfbfe948, tf_isp = 0xd6ac4d64, tf_ebx = 0x1, tf_edx = 0x80e0940, tf_ecx = 0x0, tf_eax = 0x3b, tf_trapno = 0xc, tf_err = 0x2, tf_eip = 0x281abd13, tf_cs = 0x33, tf_eflags = 0x286, tf_esp = 0xbfbfe85c, tf_ss = 0x3b}) at ../../../i386/i386/trap.c:986
#34 0xc07e564f in Xint0x80_syscall () at ../../../i386/i386/exception.s:200
#35 0x080e003b in ?? ()
(kgdb) f 23
#23 0xc0669182 in putc (chr=0x2e, clistp=0xc1b5d838) at ../../../kern/tty_subr.c:418
418      *clistp->c_cl++ = chr;
(kgdb) p *clistp
$1 = {c_cc = 0x0, c_cbcount = 0x0, c_cbmax = 0x16, c_cbreserved = 0x16, c_cf = 0x0, c_cl = 0x0}
(kgdb) up
#24 0xc06627b4 in ttyoutput (c=0x2e, tp=0xc1b5d800) at ../../../kern/tty.c:760
760      if (!ISSET(tp->t_lflag, FLUSHO) && putc(c, &tp->t_outq))
(kgdb) p *tp
$2 = {t_rawq = {c_cc = 0x0, c_cbcount = 0x0, c_cbmax = 0x4d, c_cbreserved = 0x4d, c_cf = 0x0, c_cl = 0x0}, t_rawcc = 0x43, t_canq = {
    c_cc = 0x0, c_cbcount = 0x0, c_cbmax = 0x4d, c_cbreserved = 0x6, c_cf = 0x0, c_cl = 0x0}, t_cancc = 0x0, t_outq = {c_cc = 0x0,
    c_cbcount = 0x0, c_cbmax = 0x16, c_cbreserved = 0x16, c_cf = 0x0, c_cl = 0x0}, t_outcc = 0xb88, t_line = 0x0, t_dev = 0xc20c8000,
  t_mdev = 0x0, t_devunit = 0x0, t_state = 0x20028, t_flags = 0x0, t_timeout = 0x493e0, t_pgrp = 0xc1cedd40, t_session = 0xc20d4600,
  t_sigio = 0x0, t_rsel = {si_thrlist = {tqe_next = 0x0, tqe_prev = 0x0}, si_thread = 0x0, si_note = {kl_list = {slh_first = 0x0},
      kl_lock = 0xc061ca4c <knlist_mtx_lock>, kl_unlock = 0xc061ca68 <knlist_mtx_unlock>, kl_locked = 0xc061ca84 <knlist_mtx_locked>,
      kl_lockarg = 0xc1b5d9ec}, si_flags = 0x0}, t_wsel = {si_thrlist = {tqe_next = 0x0, tqe_prev = 0x0}, si_thread = 0x0, si_note = {
      kl_list = {slh_first = 0x0}, kl_lock = 0xc061ca4c <knlist_mtx_lock>, kl_unlock = 0xc061ca68 <knlist_mtx_unlock>,
      kl_locked = 0xc061ca84 <knlist_mtx_locked>, kl_lockarg = 0xc1b5d9ec}, si_flags = 0x0}, t_termios = {c_iflag = 0x302,
    c_oflag = 0x3, c_cflag = 0x4b00, c_lflag = 0x200005cf,
    c_cc = "\004\000\b\027\025\022\b\003\034\032\031\021\023\026\017\001\000", c_ispeed = 0x9600, c_ospeed = 0x9600}, t_init_in = {
    c_iflag = 0x2b02, c_oflag = 0x3, c_cflag = 0x4b00, c_lflag = 0x5cb,
    c_cc = "\004\177\027\025\022\b\003\034\032\031\021\023\026\017\001\000\024", c_ispeed = 0x2580, c_ospeed = 0x2580},
  t_init_out = {c_iflag = 0x2b02, c_oflag = 0x3, c_cflag = 0x4b00, c_lflag = 0x5cb,
    c_cc = "\004\177\027\025\022\b\003\034\032\031\021\023\026\017\001\000\024", c_ispeed = 0x2580, c_ospeed = 0x2580},
  t_lock_in = {c_iflag = 0x0, c_oflag = 0x0, c_cflag = 0x0, c_lflag = 0x0, c_cc = '\0' <repeats 19 times>, c_ispeed = 0x0,
    c_ospeed = 0x0}, t_lock_out = {c_iflag = 0x0, c_oflag = 0x0, c_cflag = 0x0, c_lflag = 0x0, c_cc = '\0' <repeats 19 times>,
    c_ispeed = 0x0, c_ospeed = 0x0}, t_winsize = {ws_row = 0x2e, ws_col = 0x88, ws_xpixel = 0x3cb, ws_ypixel = 0x25a},
  t_sc = 0xc2049680, t_lsc = 0x0, t_column = 0x22, t_rocount = 0x0, t_rocol = 0x0, t_ififosize = 0x200, t_ihiwat = 0x1e00,
  t_ilowat = 0x1a40, t_ispeedwat = 0x0, t_ohiwat = 0x804, t_olowat = 0x100, t_ospeedwat = 0x0, t_gen = 0x0, t_list = {tqe_next = 0x0,
    tqe_prev = 0xc1b571dc}, t_actout = 0x0, t_wopeners = 0x0, t_mtx = {mtx_object = {lo_class = 0xc08c7ba4,
      lo_name = 0xc0866758 "tty", lo_type = 0xc0866758 "tty", lo_flags = 0x30000, lo_list = {tqe_next = 0xc205a0c8,
        tqe_prev = 0xc205a234}, lo_witness = 0xc0970c80}, mtx_lock = 0x4, mtx_recurse = 0x0}, t_refcnt = 0x3, t_hotchar = 0x0,
  t_dtr_wait = 0xbb8, t_do_timestamp = 0x0, t_timestamp = {tv_sec = 0x0, tv_usec = 0x0}, t_pps = 0x0, t_oproc = 0xc0668188 <ptsstart>,
  t_stop = 0xc0668478 <ptsstop>, t_param = 0, t_modem = 0, t_break = 0, t_ioctl = 0, t_open = 0, t_purge = 0, t_close = 0,
  t_cioctl = 0}
(kgdb) up
#25 0xc066580f in tputchar (c=0x2e, tp=0xc1b5d800) at ../../../kern/tty.c:2753
2753     (void)ttyoutput(c, tp);
(kgdb) up
#26 0xc064de94 in putchar (c=0x2e, arg=0xd6ac4a10) at ../../../kern/subr_prf.c:341
341             tputchar(c, tp);
(kgdb) up
#27 0xc064e722 in kvprintf (fmt=0xc085ed4b " not found\n", func=0xc064de2c <putchar>, arg=0xd6ac4a10, radix=0xa, ap=0xd6ac4a38 "")
    at ../../../kern/subr_prf.c:685
685              PCHAR(*p++);