Date: Sun, 9 Mar 2014 20:01:32 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Glen Barber <gjb@FreeBSD.org> Cc: freebsd-current@FreeBSD.org Subject: Re: panic: vm_fault: fault on nofault entry Message-ID: <20140309180132.GO24664@kib.kiev.ua> In-Reply-To: <20140309165648.GF1776@glenbarber.us> References: <20140309165648.GF1776@glenbarber.us>
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--qi0WovVLX58BkhBU Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Mar 09, 2014 at 12:56:48PM -0400, Glen Barber wrote: > We are having regular panics on several machines in the cluster. >=20 > Below follows the script from the kgdb(1) session, hopefully providing > enough information. This machine runs 11.0-CURRENT #2 r262892, from > 2 days ago. >=20 > It uses tmpfs(5) for the port build workspace. I have an unconfirmed > suspicion that use of sysutils/lsof is involved somehow, but cannot be > sure. (In my experience with panics with port building, removing lsof > from the system did have an effect, but I may be going down the wrong > rabbit hole.) >=20 >=20 > Script started on Sun Mar 9 16:40:07 2014 > root@redbuild01.nyi:/usr/obj/usr/src/sys/REDBUILD # sh > # kgdb ./kernel.debug /var/crash/vmcore.1 > GNU gdb 6.1.1 [FreeBSD] > Copyright 2004 Free Software Foundation, Inc. > GDB is free software, covered by the GNU General Public License, and you = are > welcome to change it and/or distribute copies of it under certain conditi= ons. > Type "show copying" to see the conditions. > There is absolutely no warranty for GDB. Type "show warranty" for detail= s. > This GDB was configured as "amd64-marcel-freebsd"... >=20 > Unread portion of the kernel message buffer: > panic: vm_fault: fault on nofault entry, addr: fffffe035021a000 > cpuid =3D 1 > KDB: stack backtrace: > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe1839a= 54180 > kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe1839a54230 > panic() at panic+0x155/frame 0xfffffe1839a542b0 > vm_fault_hold() at vm_fault_hold+0x1e7a/frame 0xfffffe1839a54500 > vm_fault() at vm_fault+0x77/frame 0xfffffe1839a54540 > trap_pfault() at trap_pfault+0x199/frame 0xfffffe1839a545e0 > trap() at trap+0x4a0/frame 0xfffffe1839a547f0 > calltrap() at calltrap+0x8/frame 0xfffffe1839a547f0 > --- trap 0xc, rip =3D 0xffffffff80d97bab, rsp =3D 0xfffffe1839a548b0, rbp= =3D 0xfffffe1839a54910 --- > copyout() at copyout+0x3b/frame 0xfffffe1839a54910 > memrw() at memrw+0x19f/frame 0xfffffe1839a54950 > giant_read() at giant_read+0xa4/frame 0xfffffe1839a54990 > devfs_read_f() at devfs_read_f+0xeb/frame 0xfffffe1839a549f0 > dofileread() at dofileread+0x95/frame 0xfffffe1839a54a40 > kern_readv() at kern_readv+0x68/frame 0xfffffe1839a54a90 > sys_read() at sys_read+0x63/frame 0xfffffe1839a54ae0 > amd64_syscall() at amd64_syscall+0x3fb/frame 0xfffffe1839a54bf0 > Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe1839a54bf0 > --- syscall (3, FreeBSD ELF64, sys_read), rip =3D 0x800b8444a, rsp =3D 0x= 7fffffffd088, rbp =3D 0x7fffffffd0d0 --- > KDB: enter: panic This is very similar to issue reported several time ago. Try this patch. I never get a feedback. diff --git a/sys/amd64/amd64/mem.c b/sys/amd64/amd64/mem.c index abbbb21..fd9c5df 100644 --- a/sys/amd64/amd64/mem.c +++ b/sys/amd64/amd64/mem.c @@ -98,7 +98,13 @@ memrw(struct cdev *dev, struct uio *uio, int flags) kmemphys: o =3D v & PAGE_MASK; c =3D min(uio->uio_resid, (u_int)(PAGE_SIZE - o)); - error =3D uiomove((void *)PHYS_TO_DMAP(v), (int)c, uio); + v =3D PHYS_TO_DMAP(v); + if (v < DMAP_MIN_ADDRESS || + (v > DMAP_MIN_ADDRESS + dmaplimit && + v <=3D DMAP_MAX_ADDRESS) || + pmap_kextract(v) =3D=3D 0) + return (EFAULT); + error =3D uiomove((void *)v, (int)c, uio); continue; } else if (dev2unit(dev) =3D=3D CDEV_MINOR_KMEM) { --qi0WovVLX58BkhBU Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (FreeBSD) iQIcBAEBAgAGBQJTHKx7AAoJEJDCuSvBvK1BxxAP/ijynnHhVFpA1/f7YLwxQxg5 oXjWCXr3n3aE22e40KBwQ7fAR6iCXEVStb5cmjGbauaOovGZfGn4On/qDBkYtsxj Pvxmn6fWrE9mUmMQqvnDHmJRGeHQzmZDkC2uT7OTjl1T2WNFeHD2g+H5RnA6XnWd +XaGmBJT1Vs42DcyTLME/tQ9qBB5MpOTkj1iZMTf4/cktN3f4tjqupbtNM2KT84+ cfhgnlIlbiBssxYBqjCVkH/H/IlhEq+9CGudhorkQuh64z2FFW9bqhLAZiUDREq6 43WLuIWjO3POijm2hzNyyPrfYSi5ELmC+rCmE4KhUIWousl22CEX5NkCTCpPKhkg B3IkDRruSxx5uqjFeSQ51Ep/kYg6KYtiVvVp8NL7u1L1762pIZksngluTpFcYOle hv7ZkkK7u4Xd/tBsZihCxtHa+bjlICS0DzYZCXDHXRUutwDMc/uUreLbMiP3lY3J R7vx5N0Omn2f0HkglqznIC/Pc6gGOHh8VI9S7je9EG4vU6BD/qKCYu4oe1knNjWk vwxbOgICzGCgHjGy39DKNz4igPp+pQQMfw6MDCb7XYLf4wxv22+nI5HWWMyNP123 Ndhna7Cw0Eh1s042a4E4phd+2UJI3wnHGeLi3pM4Myi//LCGR1xlPOmS3O58okXI ffT5w48YPbF9w18Cx42Q =atUp -----END PGP SIGNATURE----- --qi0WovVLX58BkhBU--
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