[Bug 215740] [bhyve] utilizing passthru breaks raw device usage with virtio-blk | ahci-hd

[bugzilla-noreply]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215740

--- Comment #7 from Harald Schmalzbauer  ---
Is there anybody who has checked whether the steps to reproduce show the
reported results? Meaning, is there anybody who can confirm correct behaviour
in that case?

I observed many more, at first sight completely unrelated strange errors, but
all show up as soon as one condition is true: shutting down a bhyve-guest which
had ppt in use.

Latest example:
panic: Memory modified after free 0xf8002486a030(48) val=0 @
0xf8002486a030

cpuid = 5
KDB: stack backtrace:
#0 0x805bf327 at kdb_backtrace+0x67
#1 0x8057f266 at vpanic+0x186
#2 0x8057f2e3 at panic+0x43
#3 0x8082eaeb at trash_ctor+0x4b
#4 0x8082aaec at uma_zalloc_arg+0x52c
#5 0x813b54a6 at zio_add_child+0x26
#6 0x813b5a05 at zio_create+0x385
#7 0x813b6de2 at zio_vdev_child_io+0x232
#8 0x81396be0 at vdev_mirror_io_start+0x370
#9 0x813bc629 at zio_vdev_io_start+0x4a9
#10 0x813b76bc at zio_execute+0x36c
#11 0x813b6868 at zio_nowait+0xb8
#12 0x81396bec at vdev_mirror_io_start+0x37c
#13 0x813bc383 at zio_vdev_io_start+0x203
#14 0x813b76bc at zio_execute+0x36c
#15 0x805d10dd at taskqueue_run_locked+0x13d
#16 0x805d1e78 at taskqueue_thread_loop+0x88
#17 0x80543844 at fork_exit+0x84

#0  doadump (textdump=) at pcpu.h:222
#1  0x8057ece0 in kern_reboot (howto=260) at
/usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_shutdown.c:366
#2  0x8057f2a0 in vpanic (fmt=, ap=)
at /usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_shutdown.c:759
#3  0x8057f2e3 in panic (fmt=) at
/usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_shutdown.c:690
#4  0x8082eaeb in trash_ctor (mem=, size=, arg=, flags=)
at /usr/local/share/deploy-tools/RELENG_11/src/sys/vm/uma_dbg.c:80
#5  0x8082aaec in uma_zalloc_arg (zone=0xf8001febc680,
udata=0xf8001ad5f340, flags=)
at /usr/local/share/deploy-tools/RELENG_11/src/sys/vm/uma_core.c:2152
#6  0x813b54a6 in zio_add_child (pio=0xf8026f350b88,
cio=0xf8002478b7b0)
at
/usr/local/share/deploy-tools/RELENG_11/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:460
#7  0x813b5a05 in zio_create (pio=0xf8026f350b88, spa=, txg=433989, bp=, data=0xfe0058afa000, 
size=1024, type=, priority=ZIO_PRIORITY_ASYNC_WRITE,
flags=, vd=, 
offset=, zb=, pipeline=)
at
/usr/local/share/deploy-tools/RELENG_11/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:690
#8  0x813b6de2 in zio_vdev_child_io (pio=0xf8026f350b88, bp=, vd=, offset=325398016, 
data=, size=1024, type=,
flags=1048704, done=)
at
/usr/local/share/deploy-tools/RELENG_11/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:1141
#9  0x81396be0 in vdev_mirror_io_start (zio=0xf8026f350b88)
at
/usr/local/share/deploy-tools/RELENG_11/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_mirror.c:488
#10 0x813bc629 in zio_vdev_io_start (zio=0xf8026f350b88)
at
/usr/local/share/deploy-tools/RELENG_11/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:3143
#11 0x813b76bc in zio_execute (zio=)
at
/usr/local/share/deploy-tools/RELENG_11/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:1681
#12 0x813b6868 in zio_nowait (zio=0xf8026f350b88)
at
/usr/local/share/deploy-tools/RELENG_11/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:1739
#13 0x81396bec in vdev_mirror_io_start (zio=0xf8026f7a7b88)
at
/usr/local/share/deploy-tools/RELENG_11/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_mirror.c:488
#14 0x813bc383 in zio_vdev_io_start (zio=0xf8026f7a7b88)
at
/usr/local/share/deploy-tools/RELENG_11/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:3021
#15 0x813b76bc in zio_execute (zio=)
at
/usr/local/share/deploy-tools/RELENG_11/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c:1681
#16 0x805d10dd in taskqueue_run_locked (queue=0xf8001ab5a700) at
/usr/local/share/deploy-tools/RELENG_11/src/sys/kern/subr_taskqueue.c:454
#17 0x805d1e78 in taskqueue_thread_loop (arg=) at
/usr/local/share/deploy-tools/RELENG_11/src/sys/kern/subr_taskqueue.c:741
#18 0x80543844 in fork_exit (callout=0x805d1df0
, arg=0xf8001aa90720, frame=0xfe043f609ac0)
at /usr/local/share/deploy-tools/RELENG_11/src/sys/kern/kern_fork.c:1042
#19 0x808598ae in fork_trampoline () at
/usr/local/share/deploy-tools/RELENG_11/src/sys/amd64/amd64/exception.S:611
#20 0x in ?? ()

I consider this as a severe problem, which shouldn't exist in 11.1-RELEASE.
If nobody can prove my findings wrong, using passthru should be disabled in
RELENG_11_1 until it can be ruled out as source of these strange problems (some
form 

Re: [Bug 215740] [bhyve] utilizing passthru breaks raw device usage with virtio-blk | ahci-hd

[Harry Schmalzbauer]

 Bezüglich bugzilla-nore...@freebsd.org's Nachricht vom 04.01.2017 21:37
(localtime):
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215740
>
…
> --- Comment #1 from Peter Grehan  ---
> Would you be able to post a verbose dmesg (boot -v) ?

Due to lack of knowledge I experimented with BIOS VT-d settings "Remap
Interrupt enable" and "Remap DMA enable".
No difference in any combination.
Is there anything else I can provide to help narrowing down the problem?
Has anybody else ever tried such a VM (using character special file as
virtio-blk backend together with a passthru device)? With success?

Thanks,

-harry
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[Bug 215740] [bhyve] utilizing passthru breaks raw device usage with virtio-blk | ahci-hd

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215740

--- Comment #5 from Harald Schmalzbauer  ---
(In reply to Peter Grehan from comment #1)

Thanks for your attention!
Please find them attached, I hope my 3-part separation doesn't confuse
anybody...

-harry

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[Bug 215740] [bhyve] utilizing passthru breaks raw device usage with virtio-blk | ahci-hd

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215740

--- Comment #4 from Harald Schmalzbauer  ---
Created attachment 178539
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178539=edit
Verbose boot log part 3, listing rest (msi assignment + consumer attaching
messages)

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[Bug 215740] [bhyve] utilizing passthru breaks raw device usage with virtio-blk | ahci-hd

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215740

--- Comment #3 from Harald Schmalzbauer  ---
Created attachment 178538
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178538=edit
Verbose boot log part 2, listing device probe messages

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[Bug 215740] [bhyve] utilizing passthru breaks raw device usage with virtio-blk | ahci-hd

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215740

--- Comment #2 from Harald Schmalzbauer  ---
Created attachment 178537
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178537=edit
Verbose boot log part 1, listing ACPI+CPU messages

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[Bug 215740] [bhyve] utilizing passthru breaks raw device usage with virtio-blk | ahci-hd

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215740

Peter Grehan  changed:

   What|Removed |Added

 CC||gre...@freebsd.org

--- Comment #1 from Peter Grehan  ---
Would you be able to post a verbose dmesg (boot -v) ?

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[Bug 215740] [bhyve] utilizing passthru breaks raw device usage with virtio-blk | ahci-hd

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Mark Linimon  changed:

   What|Removed |Added

 CC|freebsd-am...@freebsd.org   |
   Assignee|freebsd-b...@freebsd.org|freebsd-virtualization@Free
   ||BSD.org

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