i386/36850: Page Fault using ppp with USB Modem

Wed Jul 16 22:50:19 PDT 2003

The following reply was made to PR i386/36850; it has been noted by GNATS.

From: Joe Ondrechen <ondrechenj at whiteice.com>
To: freebsd-gnats-submit at FreeBSD.org, ondrechenj at whiteice.com
Cc:  
Subject: Re: i386/36850: Page Fault using ppp with USB Modem
Date: Wed, 16 Jul 2003 22:42:01 -0700

 Yes, the problem appears to occur in version 4.8:

 Environment:
 FreeBSD kayakxw.sd.lan 4.8-RELEASE FreeBSD 4.8-RELEASE #0: Mon Jul 14 
 23:30:39 PDT 2003     root at kayakxw.sd.lan:/usr/src/sys/compile/KAYAKXW  
 i386

 gdb backtrace:
 GNU gdb 4.18 (FreeBSD)
 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 at phsyical address 0x004ca000
 initial pcb at physical address 0x00401a40
 panicstr: page fault
 panic messages:
 ---
 panic: clist reservation botch

 syncing disks...

 Fatal trap 12: page fault while in kernel mode
 fault virtual address	= 0x30
 fault code		= supervisor read, page not present
 instruction pointer	= 0x8:0xc02b26d0
 stack pointer	        = 0x10:0xc03a7340
 frame pointer	        = 0x10:0xc03a7348
 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		= Idle
 interrupt mask		= tty bio
 trap number		= 12
 panic: page fault
 Uptime: 55m3s

 dumping to dev #da/0x20001, offset 493616
 dump 256 255 254 253 252 251 250 249 248 247 246 245 244 243 242 241 240 
 239 238 237 236 235 234 233 232 231 230 229 228 227 226 225 224 223 222 
 221 220 219 218 217 216 215 214 213 212 211 210 209 208 207 206 205 204 
 203 202 201 200 199 198 197 196 195 194 193 192 191 190 189 188 187 186 
 185 184 183 182 181 180 179 178 177 176 175 174 173 172 171 170 169 168 
 167 166 165 164 163 162 161 160 159 158 157 156 155 154 153 152 151 150 
 149 148 147 146 145 144 143 142 141 140 139 138 137 136 135 134 133 132 
 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 
 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:487
 487		if (dumping++) {
 (kgdb) backtrace
 #0  dumpsys () at ../../kern/kern_shutdown.c:487
 #1  0xc01bb417 in boot (howto=260) at ../../kern/kern_shutdown.c:316
 #2  0xc01bb83c in poweroff_wait (junk=0xc039e08c, howto=-1069950033)
     at ../../kern/kern_shutdown.c:595
 #3  0xc033a99a in trap_fatal (frame=0xc03a7300, eva=48)
     at ../../i386/i386/trap.c:974
 #4  0xc033a66d in trap_pfault (frame=0xc03a7300, usermode=0, eva=48)
     at ../../i386/i386/trap.c:867
 #5  0xc033a257 in trap (frame={tf_fs = 7012368, tf_es = 7012368,
       tf_ds = 537002000, tf_edi = -1069432832, tf_esi = 0,
       tf_ebp = -1069911224, tf_isp = -1069911252, tf_ebx = -1069736100,
       tf_edx = 6865984, tf_ecx = 9, tf_eax = 0, tf_trapno = 12, tf_err = 
 0, 
       tf_eip = -1070913840, tf_cs = 8, tf_eflags = 66054, tf_esp = 0,
       tf_ss = 0}) at ../../i386/i386/trap.c:466
 #6  0xc02b26d0 in acquire_lock (lk=0xc03d1f5c)
     at ../../ufs/ffs/ffs_softdep.c:266
 #7  0xc02b6cf2 in softdep_fsync_mountdev (vp=0xcd3d59c0)
     at ../../ufs/ffs/ffs_softdep.c:4024
 #8  0xc02baf2a in ffs_fsync (ap=0xc03a73bc) at 
 ../../ufs/ffs/ffs_vnops.c:134
 #9  0xc02b9bb3 in ffs_sync (mp=0xc1672a00, waitfor=2, cred=0xc0e3c800, 
     p=0xc041c000) at vnode_if.h:558
 #10 0xc01eb737 in sync (p=0xc041c000, uap=0x0) at 
 ../../kern/vfs_syscalls.c:576
 #11 0xc01bb1b2 in boot (howto=256) at ../../kern/kern_shutdown.c:235
 #12 0xc01bb83c in poweroff_wait (junk=0xc03720c4, howto=-1048197888)
     at ../../kern/kern_shutdown.c:595
 #13 0xc01d58e8 in putc (chr=146, clistp=0xc185c500)
     at ../../kern/tty_subr.c:103
 #14 0xc01d0d67 in ttyinput (c=146, tp=0xc185c500) at ../../kern/tty.c:554
 #15 0xc04a6d5e in ?? ()
 #16 0xc02d933f in usb_transfer_complete (xfer=0xc15b9600)
     at ../../dev/usb/usbdi.c:767
 #17 0xc02d3527 in uhci_idone (ii=0xc17c8aa0) at ../../dev/usb/uhci.c:1164
 #18 0xc02d3400 in uhci_check_intr (sc=0xc15be000, ii=0xc17c8aa0)
     at ../../dev/usb/uhci.c:1058
 #19 0xc02d336b in uhci_intr (arg=0xc15be000) at ../../dev/usb/uhci.c:995
 #20 0xc034514d in intr_mux (arg=0xc15bae40)
     at ../../i386/isa/intr_machdep.c:582
 #21 0xc03343e2 in cpu_idle () at ../../i386/i386/machdep.c:1022
 (kgdb) quit

 Note:
 gdb did return some warnings that did not get redirected to file when I 
 captured the above, here is the stderr output:
 This GDB was configured as "i386-unknown-freebsd"...Deprecated bfd_read 
 called at 
 /usr/src/gnu/usr.bin/binutils/gdb/../../../../contrib/gdb/gdb/dbxread.c 
 line 2627 in elfstab_build_psymtabs
 Deprecated bfd_read called at 
 /usr/src/gnu/usr.bin/binutils/gdb/../../../../contrib/gdb/gdb/dbxread.c 
 line 933 in fill_symbuf