Date: Tue, 17 Nov 2009 10:32:41 +0200 From: Andriy Gapon <avg@icyb.net.ua> To: Kai Gallasch <gallasch@free.de> Cc: freebsd-current@freebsd.org Subject: Re: 8.0RC2 amd64 - kernel panic running make buildworld Message-ID: <4B025FA9.7020003@icyb.net.ua> In-Reply-To: <4AFE7A32.7060203@icyb.net.ua> References: <1031257439203@webmail57.yandex.ru> <hdc73v$4rt$1@ger.gmane.org> <941257966918@webmail42.yandex.ru> <200911111504.14906.jhb@freebsd.org> <20091112195932.5875387e@orwell.free.de> <4AFD140D.7010407@icyb.net.ua> <20091113144804.2c0fb90f@orwell.free.de> <4AFD655E.5020801@icyb.net.ua> <20091114022121.217dd831@orwell.free.de> <4AFE7A32.7060203@icyb.net.ua>
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on 14/11/2009 11:36 Andriy Gapon said the following: > on 14/11/2009 03:21 Kai Gallasch said the following: >> Hi. The patch did help for surviving a makeworld. >> >> But now I have another machine check exception with this server. It >> happened with your patch active, and vm.pmap.pg_ps_enabled="1". I >> copied data from a remote server by NFS mount to the instable server. >> Destination was a local ZFS filesystem. >> >> ---------------- >> >> sonnenkraft:~ # MCA: CPU 7 UNCOR PCC OVER DTLB L1 error >> MCA: Address 0xff800d860000 > > It's interesting because the same happened to me too, only in my case it was > zpool scrub that triggered it. > I will try to look into this further. > Kai, the latest patch in the works, it's against a clean tree: diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c index 44b71f3..ff35eb9 100644 --- a/sys/amd64/amd64/pmap.c +++ b/sys/amd64/amd64/pmap.c @@ -2365,6 +2365,9 @@ pmap_demote_pde * the read above and the store below. */ pde_store(pde, newpde); + pmap_invalidate_page(pmap, va); + clflush((vm_offset_t)vtopde(va)); + mfence(); /* * Invalidate a stale recursive mapping of the page table page. @@ -2981,6 +2984,11 @@ setpte: * Map the superpage. */ pde_store(pde, PG_PS | newpde); + pmap_invalidate_range(pmap, va & ~PDRMASK, (va & ~PDRMASK) + NBPDR); + clflush((vm_offset_t)vtopde(va)); + mfence(); + if (va >= VM_MAXUSER_ADDRESS) + pmap_invalidate_page(pmap, (vm_offset_t)vtopte(va)); pmap_pde_promotions++; CTR2(KTR_PMAP, "pmap_promote_pde: success for va %#lx" -- Andriy Gapon
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