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)
> {
> + struct bio *bp = zio->io_bio;
> +
> + if (zio->io_type == ZIO_TYPE_READ) {
> + abd_return_buf_copy(zio->io_abd, bp->bio_data, zio->io_size);
> + } else if (zio->io_type == ZIO_TYPE_WRITE) {
> + abd_return_buf(zio->io_abd, bp->bio_data, zio->io_size);
> + }
> +
> + g_destroy_bio(bp);
> }
We are getting a 100% repeatable failure when trying to boot machines with
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 = 1; apic id = 01
fault virtual address = 0x28
Fatal trap 12: page fault while in kernel mode
cpuid = 3; apic id = 07
fault virtual address = 0x28
Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 06
apic id = 00
fault virtual address = 0x28
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, fault virtual address
= 0x28
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff803aab56
stack pointer = 0x28:0xfffffe0239fa3a90
fault code = supervisor read data, page not present
IOPL = 0
current process = 0 (zio_write_intr_0)
frame pointer = 0x28:0xfffffe0239fa3aa0
db> where
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 multiple cores
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)
--
Peter Wemm - pe...@wemm.org; pe...@freebsd.org; pe...@yahoo-inc.com; KI6FJV
UTF-8: for when a ' or ... just won\342\200\231t do\342\200\246
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