Date: Tue, 11 Jul 2017 23:08:15 -0700 From: Peter Wemm <peter@wemm.org> To: Andriy Gapon <avg@freebsd.org> Cc: svn-src-head@freebsd.org, src-committers@freebsd.org, svn-src-all@freebsd.org Subject: Re: svn commit: r320452 - in head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs: . sys Message-ID: <2865573.6VCVxXl8ZR@overcee.wemm.org> In-Reply-To: <201706281359.v5SDxKDB033681@repo.freebsd.org> References: <201706281359.v5SDxKDB033681@repo.freebsd.org>
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On Wednesday, June 28, 2017 01:59:20 PM Andriy Gapon wrote:
> A side bonus of this change is that now a vdev zio has a pointer
> to its corresponding bio while the zio is active.
> @@ -1094,6 +1088,15 @@ sendreq:
> static void
> vdev_geom_io_done(zio_t *zio)
> {
> +=09struct bio *bp =3D zio->io_bio;
> +
> +=09if (zio->io_type =3D=3D ZIO_TYPE_READ) {
> +=09=09abd_return_buf_copy(zio->io_abd, bp->bio_data, zio->io_size);
> +=09} else if (zio->io_type =3D=3D ZIO_TYPE_WRITE) {
> +=09=09abd_return_buf(zio->io_abd, bp->bio_data, zio->io_size);
> +=09}
> +
> +=09g_destroy_bio(bp);
> }
We are getting a 100% repeatable failure when trying to boot machines w=
ith=20
degraded volumes in the freebsd.org cluster.
<118>Setting hostname: tiny.nyi.freebsd.org.
<118>Setting up harvesting: [UMA],
[FS_ATIME],SWI,INTERRUPT,NET_NG,NET_ETHER,NET_TUN,MOUSE,KEYBOARD,D
<118>Feeding entropy: .
Fatal trap 12: page fault while in kernel mode
cpuid =3D 1; apic id =3D 01
fault virtual address=09=3D 0x28
Fatal trap 12: page fault while in kernel mode
cpuid =3D 3; apic id =3D 07
fault virtual address=09=3D 0x28
Fatal trap 12: page fault while in kernel mode
cpuid =3D 2; apic id =3D 06
apic id =3D 00
fault virtual address =3D 0x28
=3D DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags =3D interrupt enabled, resume, fault virtual ad=
dress =20
=3D 0x28
fault code =3D supervisor read data, page not present
instruction pointer =3D 0x20:0xffffffff803aab56
stack pointer =3D 0x28:0xfffffe0239fa3a90
fault code =3D supervisor read data, page not present
IOPL =3D 0
current process =3D 0 (zio_write_intr_0)
frame pointer =3D 0x28:0xfffffe0239fa3aa0
db> where =20
Tracing pid 0 tid 100471 td 0xfffff80005452000
vdev_geom_io_done() at vdev_geom_io_done+0x36/frame 0xfffffe0239f9eaa0
zio_vdev_io_done() at zio_vdev_io_done+0x176/frame 0xfffffe0239f9ead0
zio_execute() at zio_execute+0xac/frame 0xfffffe0239f9eb20
This is dereferencing a null bp (ie: zio->io_bio). It traps on multipl=
e cores=20
concurrently.
FreeBSD 12.0-CURRENT #0 r320900: Wed Jul 12 03:00:15 UTC 2017
(This is a smoke-test machine, recycled from somewhere else)
=2D-=20
Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com; KI=
6FJV
UTF-8: for when a ' or ... just won\342\200\231t do\342\200\246
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