panic: vm_object_madvise: page 0xfffffe0413c58630 is fictitious

[Konstantin Belousov]

On Tue, Nov 27, 2012 at 04:38:12PM +0100, Andre Oppermann wrote:
> On 27.11.2012 16:06, Konstantin Belousov wrote:
> > On Tue, Nov 27, 2012 at 12:26:44PM +0100, Andre Oppermann wrote:
> >> FreeBSD bbb.ccc 10.0-CURRENT FreeBSD 10.0-CURRENT #0:
> >> Fri Nov 23 17:00:40 CET 2012
> >> aaa at bbb.ccc:/usr/obj/usr/src/head/sys/GENERIC  amd64
> >>
> >> #0  doadump (textdump=-2014022336) at pcpu.h:229
> >> #1  0xffffffff8033e2d2 in db_fncall (dummy1=<value optimized out>,
> >> dummy2=<value optimized out>,
> >>       dummy3=<value optimized out>, dummy4=<value optimized out>)
> >>       at /usr/src/head/sys/ddb/db_command.c:578
> >> #2  0xffffffff8033e074 in db_command (last_cmdp=<value optimized out>,
> >>       cmd_table=<value optimized out>, dopager=1) at
> >> /usr/src/head/sys/ddb/db_command.c:449
> >> #3  0xffffffff8033dd62 in db_command_loop () at
> >> /usr/src/head/sys/ddb/db_command.c:502
> >> #4  0xffffffff80340690 in db_trap (type=<value optimized out>, code=0)
> >>       at /usr/src/head/sys/ddb/db_main.c:231
> >> #5  0xffffffff808b375e in kdb_trap (type=3, code=0, tf=<value optimized
> >> out>)
> >>       at /usr/src/head/sys/kern/subr_kdb.c:654
> >> #6  0xffffffff80bfc71a in trap (frame=0xffffff8487f478a0)
> >>       at /usr/src/head/sys/amd64/amd64/trap.c:579
> >> #7  0xffffffff80be65b2 in calltrap () at /tmp/exception-3nQ6Cf.s:179
> >> #8  0xffffffff808b2f5e in kdb_enter (why=0xffffffff80e5e23b "panic",
> >> msg=<value optimized out>)
> >>       at cpufunc.h:63
> >> #9  0xffffffff8088086f in panic (fmt=<value optimized out>)
> >>       at /usr/src/head/sys/kern/kern_shutdown.c:628
> >> #10 0xffffffff80adea4a in vm_object_madvise (object=<value optimized out>,
> >>       pindex=<value optimized out>, end=8952, advise=<value optimized out>)
> >>       at /usr/src/head/sys/vm/vm_object.c:1101
> >> #11 0xffffffff80ad759a in vm_map_madvise (map=0xfffffe0018260188,
> >> start=<value optimized out>,
> >>       end=<value optimized out>, behav=5) at
> >> /usr/src/head/sys/vm/vm_map.c:2140
> >> #12 0xffffffff80adbd8d in sys_madvise (td=<value optimized out>,
> >> uap=<value optimized out>)
> >>       at /usr/src/head/sys/vm/vm_mmap.c:752
> >> #13 0xffffffff80bfd3a5 in amd64_syscall (td=0xfffffe0018230000,
> >> traced=0) at subr_syscall.c:135
> >> #14 0xffffffff80be689b in Xfast_syscall () at /tmp/exception-3nQ6Cf.s:329
> >> #15 0x00000000016f3bfa in ?? ()
> >
> > I think this is an omission in the check for the object types. BTW, this
> > pattern already repeats in several places, I thought about adding either
> > new pager method, like boolean_t vm_pager_is_pageable(), or just a flag
> > fields to the struct vm_pager to classify the vm objects.
> >
> > I am curious, what was the process which caused the panic ?
> 
> Clang doing a manual kernel build of my work tree with "make -j8 kernel".
You did not answered my question, what was the process that caused the
panic ? As in, could it be X server ?

> 
> -- 
> Andre
> 
> > diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c
> > index e19750c..5b8ed23 100644
> > --- a/sys/vm/vm_object.c
> > +++ b/sys/vm/vm_object.c
> > @@ -1060,7 +1060,10 @@ shadowlookup:
> >   			    (tobject->flags & OBJ_ONEMAPPING) == 0) {
> >   				goto unlock_tobject;
> >   			}
> > -		} else if (tobject->type == OBJT_PHYS)
> > +		} else if (tobject->type == OBJT_PHYS ||
> > +		    tobject->type == OBJT_SG ||
> > +		    tobject->type == OBJT_MGTDEVICE ||
> > +		    tobject->type == OBJT_DEVICE)
> >   			goto unlock_tobject;
> >   		m = vm_page_lookup(tobject, tpindex);
> >   		if (m == NULL && advise == MADV_WILLNEED) {
> >
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