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Re: kern/133902: [tun] Killing tun0 iface ssh tunnel causes Panic String: page fault



I have asked Leonardo to provide more info and backtrace.

So here is backtrace:

cobra4# kgdb /boot/kernel/kernel.symbols /var/crash/vmcore.0
[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]
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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-marcel-freebsd".

Unread portion of the kernel message buffer:


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x65656c7b
fault code              = supervisor write, page not present
instruction pointer     = 0x20:0xc0786e00
stack pointer           = 0x28:0xe958fac4
frame pointer           = 0x28:0xe958fac4
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         = 66873 (ssh)
trap number             = 12
panic: page fault
cpuid = 1
Uptime: 54d11h21m54s
Physical memory: 2023 MB
Dumping 277 MB: 262 246 230 214 198 182 166 150 134 118 102 86 70 54 38 22 6

#0  doadump () at pcpu.h:195
195     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) backtrace
#0  doadump () at pcpu.h:195
#1  0xc0754457 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2  0xc0754719 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3  0xc0a4905c in trap_fatal (frame=0xe958fa84, eva=1701145723) at
/usr/src/sys/i386/i386/trap.c:899
#4  0xc0a492e0 in trap_pfault (frame=0xe958fa84, usermode=0,
eva=1701145723) at /usr/src/sys/i386/i386/trap.c:812
#5  0xc0a49c8c in trap (frame=0xe958fa84) at /usr/src/sys/i386/i386/trap.c:490
#6  0xc0a2fc0b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7  0xc0786e00 in clear_selinfo_list (td=0xca3fc840) at
/usr/src/sys/kern/sys_generic.c:1065
#8  0xc0788efc in kern_select (td=0xca3fc840, nd=8, fd_in=0x284010b8,
fd_ou=0x284010bc, fd_ex=0x0, tvp=0x0) at
/usr/src/sys/kern/sys_generic.c:794
#9  0xc07890de in select (td=0xca3fc840, uap=0xe958fcfc) at
/usr/src/sys/kern/sys_generic.c:663
#10 0xc0a49635 in syscall (frame=0xe958fd38) at
/usr/src/sys/i386/i386/trap.c:1035
#11 0xc0a2fc70 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:196
#12 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)

The system panics on

ifconfig tun0 destroy

This issue is related to kern/116837.

Leonardo, you can try the patch attached to that pr.

-- 
Mikolaj Golub
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