On Thursday, September 12, 2013 9:23:39 pm J.R. Oldroyd wrote: > On Mon, 9 Sep 2013 16:54:27 -0400 John Baldwin <[email protected]> wrote: > > > > > > > > > > > (kgdb) list *0xffffffff80ceddcd > > > > > 0xffffffff80ceddcd is in pmap_enter > > > > > (../../../amd64/amd64/pmap.c:3577). > > > > > 3572 if ((m->oflags & VPO_UNMANAGED) == 0) { > > > > > 3573 newpte |= PG_MANAGED; > > > > > 3574 pv = get_pv_entry(pmap, &lock); > > > > > 3575 pv->pv_va = va; > > > > > 3576 CHANGE_PV_LIST_LOCK_TO_PHYS(&lock, pa); > > > > > 3577 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, > > > > > pv_list); > > > > > 3578 if ((newpte & PG_RW) != 0) > > > > > 3579 vm_page_aflag_set(m, PGA_WRITEABLE); > > > > > 3580 } > > > > > 3581 > > > > > > > > So it seems like pv_list of a page might be busted? Can you try > > > > looking at > > > > the disassembly to see if you can find 'm' in one of the registers? > > > > > > > > > > Sure, here you go... > > > > > > (kgdb) print m > > > $1 = 0xfffffe00b260b430 > > > (kgdb) print m->md.pv_list > > > $4 = {tqh_first = 0x0, tqh_last = 0x0} > > > > Eh, tqh_last shouldn't bmd.pv_liste NULL here IIRC. I think it should > > point at > > &tqh_first. > > > > I had a quick look at the code for this list. > > md.pv_list is initialized in pmap_page_init() and there's also a > similar piece of init in pmap_init(), both in sys/amd64/amd64/pmap.c > and also in the other arch's. > > But I have little background on how the VM code is supposed to be > initialized or saved on suspend and re-inited on resume. It'd take > me ages to work out what should be going on here.
The hardware should preserve RAM contents which is all VM really needs. > What's the best course of action here...? Open a PR and hand-over to > someone with more background in these areas? I think kib@ is the best person to ask. I suspect it is a bug in how a driver is handling resume perhaps. -- John Baldwin _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-acpi To unsubscribe, send any mail to "[email protected]"
