netgraph calling VFS from network swi (was: Re: 5.2-RC fatal trap 12)

On Fri, 12 Dec 2003, Alexander Motin wrote:

> Same problem on other hardware but on system booted from same HDD: 

This is a really scary stack trace -- it looks like netgraph is calling
into the kernel linker from the network swi, and that in turn is hitting
VFS.  I may have missed earlier messages in this thread, but do you have a
precise list of userland activities you're performing to trigger this?  It
looks like you're doing something that causes netgraph to load additional
modules...  Which would probably not be such a bad thing if it happened in
a different thread context.

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert_at_fledge.watson.org      Senior Research Scientist, McAfee Research


> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0x0
> fault code              = supervisor read, page not present
> instruction pointer     = 0x8:0xc056cbd3
> stack pointer           = 0x10:0xd2a3e79c
> frame pointer           = 0x10:0xd2a3e7b8
> 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         = 29 (swi1: net)
> trap number             = 12
> panic: page fault
> cpuid = 0;
> 
> (kgdb) bt
> #0  0xc057601b in doadump ()
> #1  0xc0576661 in boot ()
> #2  0xc0576a3e in panic ()
> #3  0xc06d32cc in trap_fatal ()
> #4  0xc06d2f72 in trap_pfault ()
> #5  0xc06d2b83 in trap ()
> #6  0xc06bfd78 in calltrap ()
> #7  0xc05d2c2c in vref ()
> #8  0xc05cb7c8 in namei ()
> #9  0xc05ddc11 in vn_open_cred ()
> #10 0xc05dd9b3 in vn_open ()
> #11 0xc0568dd4 in linker_hints_lookup ()
> #12 0xc05692ea in linker_search_module ()
> #13 0xc05694cb in linker_load_module ()
> #14 0xc3de0a36 in ng_make_node () from /boot/kernel/netgraph.ko
> #15 0xc3de2ab1 in ng_mkpeer () from /boot/kernel/netgraph.ko
> #16 0xc3de4861 in ng_generic_msg () from /boot/kernel/netgraph.ko
> #17 0xc3de44c5 in ng_apply_item () from /boot/kernel/netgraph.ko
> #18 0xc3de6944 in ngintr () from /boot/kernel/netgraph.ko
> #19 0xc05e99d9 in swi_net ()
> #20 0xc05631f2 in ithread_loop ()
> #21 0xc05621a4 in fork_exit ()
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