kern/118258 sysctl causing panics on 7.0-xxx

Jeff Palmer jeff at
Wed Nov 28 06:50:03 PST 2007

The following reply was made to PR kern/118258; it has been noted by GNATS.

From: Jeff Palmer <jeff at>
To: bug-followup at
Subject: Re: kern/118258 sysctl causing panics on 7.0-xxx
Date: Wed, 28 Nov 2007 09:28:47 -0500

 Caught another vmcore,=20
 this time simply from 'sysctl -a'
 This one showed debugging data from the if_wpi driver on the terminal
 immediately before the panic.
 Since the wpi driver is in -CURRENT (and not in 7.3-BETA3) I'm uncertain
 if this should actually be filed as a PR,  or just brought up on the
 current@ list.
 I'm not certain it's directly related to the wpi driver,  so until
 informed otherwise,  I'll just keep submitting followups to this PR as I
 Jeff Palmer
 Laptop# kgdb /usr/obj/usr/src/sys/GENERIC/kernel.debug /var/crash/vmcore.=
 [GDB will not be able to debug user-mode threads:
 /usr/lib/ Undefined symbol "
 GNU gdb 6.1.1 [FreeBSD]
 Copyright 2004 Free Software Foundation, Inc.
 GDB is free software, covered by the GNU General Public License, and you =
 welcome to change it and/or distribute copies of it under certain
 Type "show copying" to see the conditions.
 There is absolutely no warranty for GDB.  Type "show warranty" for detail=
 This GDB was configured as "i386-marcel-freebsd".
 Unread portion of the kernel message buffer:
 Fatal trap 12: page fault while in kernel mode
 cpuid =3D 1; apic id =3D 01
 fault virtual address   =3D 0x18264
 fault code              =3D supervisor read, page not present
 instruction pointer     =3D 0x20:0xc06e6a11
 stack pointer           =3D 0x28:0xe76e9aa4
 frame pointer           =3D 0x28:0xe76e9aa4
 code segment            =3D base 0x0, limit 0xfffff, type 0x1b
                         =3D DPL 0, pres 1, def32 1, gran 1
 processor eflags        =3D interrupt enabled, resume, IOPL =3D 0
 current process         =3D 53221 (sysctl)
 trap number             =3D 12
 panic: page fault
 cpuid =3D 1
 Uptime: 1d5h15m17s
 Physical memory: 1001 MB
 Dumping 210 MB: 195 179 163 147 131 115 99 83 67 51 35 19 3
 #0  doadump () at pcpu.h:195
 195     pcpu.h: No such file or directory.
         in pcpu.h
 (kgdb) bt
 #0  doadump () at pcpu.h:195
 #1  0xc0750c17 in boot (howto=3D260) at /usr/src/sys/kern/kern_shutdown.c=
 #2  0xc0750ed9 in panic (fmt=3DVariable "fmt" is not available.
 ) at /usr/src/sys/kern/kern_shutdown.c:563
 #3  0xc0a1542c in trap_fatal (frame=3D0xe76e9a64, eva=3D98916)
     at /usr/src/sys/i386/i386/trap.c:872
 #4  0xc0a156b0 in trap_pfault (frame=3D0xe76e9a64, usermode=3D0, eva=3D98=
     at /usr/src/sys/i386/i386/trap.c:785
 #5  0xc0a16025 in trap (frame=3D0xe76e9a64) at
 #6  0xc09fc04b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
 #7  0xc06e6a11 in dev2udev (x=3D0xc50f4b00) at
 #8  0xc0790e22 in sysctl_kern_ttys (oidp=3D0xc0b4b7e0, arg1=3D0x0, arg2=3D=
     at /usr/src/sys/kern/tty.c:3078
 #9  0xc075a457 in sysctl_root (oidp=3DVariable "oidp" is not available.
 ) at /usr/src/sys/kern/kern_sysctl.c:1306
 #10 0xc075a5a4 in userland_sysctl (td=3D0xc5049210, name=3D0xe76e9c14,
 namelen=3D2, old=3D0x0,
     oldlenp=3D0xbfbfe334, inkernel=3D0, new=3D0x0, newlen=3D0,
 retval=3D0xe76e9c10, flags=3D0)
     at /usr/src/sys/kern/kern_sysctl.c:1401
 #11 0xc075b33e in __sysctl (td=3D0xc5049210, uap=3D0xe76e9cfc)
     at /usr/src/sys/kern/kern_sysctl.c:1336
 #12 0xc0a15a05 in syscall (frame=3D0xe76e9d38) at
 #13 0xc09fc0b0 in Xint0x80_syscall () at
 #14 0x00000033 in ?? ()
 Previous frame inner to this frame (corrupt stack?)
 (kgdb) list
 196             call    syscall
 197             add     $4, %esp
 198             MEXITCOUNT
 199             jmp     doreti
 201     ENTRY(fork_trampoline)
 202             pushl   %esp                    /* trapframe pointer */
 203             pushl   %ebx                    /* arg1 */
 204             pushl   %esi                    /* function */
 205             call    fork_exit

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