Re: panic: page fault

On Friday, December 21, 2012 05:47:26 AM Ivan Klymenko wrote:
> В Tue, 14 Aug 2012 14:04:07 -0400
> 
> John Baldwin <jhb_at_freebsd.org> пишет:
> > On Tuesday, August 14, 2012 05:29:09 AM Ivan Klymenko wrote:
> > > http://privatepaste.com/147286442b
> > 
> > It is easier to reply if the messages are inline (for future
> > reference).  The panic and relevant bit of backtrace are below.
> > Sadly, trying to cut and paste this destroyed the formatting, so I've
> > tried to fix it by hand. :(
> > 
> > Fatal trap 12: page fault while in kernel mode
> > cpuid = 0; apic id = 00
> > fault virtual address   = 0x18
> > fault code              = supervisor read data, page not present
> > instruction pointer     = 0x20:0xffffffff80933e07
> > stack pointer           = 0x28:0xffffff823025b660
> > frame pointer           = 0x28:0xffffff823025b6c0
> > code segment            = base 0x0, limit 0xfffff, type 0x1b
> > 
> >                         = DPL 0, pres 1, long 1, def32 0, gran 1
> > 
> > processor eflags        = interrupt enabled, resume, IOPL = 0
> > current process         = 12 (irq256: bce0)
> > trap number             = 12
> > panic: page fault
> > 
> > #6  0xffffffff80bb5e53 in calltrap ()
> > 
> >     at /usr/src/sys/amd64/amd64/exception.S:228
> > 
> > #7  0xffffffff80933e07 in m_copym (m=0x0, off0=1500, len=1480, wait=1)
> > 
> >     at /usr/src/sys/kern/uipc_mbuf.c:542
> > 
> > #8  0xffffffff809f8b76 in ip_fragment (ip=0xfffffe004b2f3980,
> > m_frag=0xffffff823025b7c8, mtu=Variable "mtu" is not available. )
> > 
> >     at /usr/src/sys/netinet/ip_output.c:822
> > 
> > #9  0xffffffff809f948a in ip_output (m=0xfffffe004b2f3900,
> > opt=Variable "opt" is not available. )
> > 
> >     at /usr/src/sys/netinet/ip_output.c:654
> > 
> > #10 0xffffffff809f59fa in ip_forward (m=0xfffffe004b2f3900,
> > srcrt=Variable "srcrt" is not available. )
> > 
> >     at /usr/src/sys/netinet/ip_input.c:1494
> > 
> > #11 0xffffffff809f6dc6 in ip_input (m=0xfffffe004b2f3900)
> > 
> >     at /usr/src/sys/netinet/ip_input.c:702
> 
> I apologize for not having answered - no more required files...
> At that time it was not possible to fulfill your request ...
> Now I have gained a number of similar panic's and i ready to provide
> the results.
> 
> > Can you run kgdb again and do 'frame 8' followed by 'p *m_frag', 'p
> > m0', and 'p *m0'?
> 
> kgdb.log in attach

Looks like this attachment was lost unfortunately.  Can you reply with
the output inline (and include the output from the other kgdb commands
below)?

> > Can you also grab my gdb scripts at www.freebsd.org/~jhb/gdb/ and run
> > 'cd /path/to/scripts', 'source gdb6', 'mbuf m0' as well?
> 
> What kind of shell should I use for this?

Ah, those are meant to be run while you are in kgdb.

-- 
John Baldwin