> Alternatively, following script would demo the panic if you don't have
> a physically removable terminal device:
>
> #!/bin/sh
> #
> # Warning! Running this script as root will panic your CURRENT box...
> #
> while true; do
> kldload dcons
> kldunload dcons
> ls /dev
> sysctl kern.ttys
> sleep 1
> done
>
> This seems to be a race between devfs and destroy_dev(), Cc'ing kib@
> since he probably has more clues in this area.
>
>> -------- Original Message --------
>> Subject: Re: kern/118258 sysctl causing panics on 7.0-xxx
>> Date: Wed, 28 Nov 2007 14:50:02 GMT
>> From: Jeff Palmer <jeff@rexdb.com>
>> Reply-To: Jeff Palmer <jeff@rexdb.com>
>> To:
freebsd-bugs@FreeBSD.org
>>
>> The following reply was made to PR kern/118258; it has been noted by
>> GNATS.
>>
>> From: Jeff Palmer <jeff@rexdb.com>
>> To:
bug-followup@freebsd.org
>> Cc:
>> 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
>> can.
>>
>> Thanks,
>>
>> Jeff Palmer
>>
>>
>> Laptop# kgdb /usr/obj/usr/src/sys/GENERIC/kernel.debug
>> /var/crash/vmcore.=
>> 1
>> [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.
>> 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
>> detail=
>> s.
>> 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=
>> :409
>> #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=
>> 916)
>> at /usr/src/sys/i386/i386/trap.c:785
>> #5 0xc0a16025 in trap (frame=3D0xe76e9a64) at
>> /usr/src/sys/i386/i386/trap.c:463
>> #6 0xc09fc04b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
>> #7 0xc06e6a11 in dev2udev (x=3D0xc50f4b00) at
>> /usr/src/sys/fs/devfs/devfs_vnops.c:1322
>> #8 0xc0790e22 in sysctl_kern_ttys (oidp=3D0xc0b4b7e0, arg1=3D0x0,
>> arg2=3D=
>> 0,
>> req=3D0xe76e9ba4)
>> 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
>> /usr/src/sys/i386/i386/trap.c:1008
>> #13 0xc09fc0b0 in Xint0x80_syscall () at
>> /usr/src/sys/i386/i386/exception.s:196
>> #14 0x00000033 in ?? ()
>> Previous frame inner to this frame (corrupt stack?)
>> (kgdb) list
>> 196 call syscall
>> 197 add , %esp
>> 198 MEXITCOUNT
>> 199 jmp doreti
>> 200
>> 201 ENTRY(fork_trampoline)
>> 202 pushl %esp /* trapframe pointer */
>> 203 pushl %ebx /* arg1 */
>> 204 pushl %esi /* function */
>> 205 call fork_exit
>> (kgdb)
> --
> Cheers,
>
> Tai-hwa Liang
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