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Date:      Tue, 15 Oct 2019 10:26:55 +0200
From:      Roger Pau =?iso-8859-1?Q?Monn=E9?= <royger@freebsd.org>
To:        Brian Buhrow <buhrow@nfbcal.org>
Cc:        freebsd-xen@freebsd.org
Subject:   Re: i/o is very slow on FreeBSD dom0 with Xen-4.12 and Freebsd-12
Message-ID:  <20191015082655.GB14005@Air-de-Roger>
In-Reply-To: <201910142145.x9ELj4c8008732@lothlorien.nfbcal.org>
References:  <CAPLaKK7TKGQ23njecW7UhHxvaSm%2B44Y%2BnkdPQ=_FSXZShniH2g@mail.gmail.com> <201910142145.x9ELj4c8008732@lothlorien.nfbcal.org>

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On Mon, Oct 14, 2019 at 02:45:04PM -0700, Brian Buhrow wrote:
> 	hello.  Using: ioapic_ack=old causes the dom0 to crash.  Below are the
> logs.

Does the crash happen every time you boot with ioapic_ack=old?

[...]
> dev = gpt/gptroot, block = 1, fs = /
> panic: ffs_blkfree_cg: freeing free block
> cpuid = 2
> time = 1571088217
> KDB: stack backtrace:
> #0 0xffffffff80be78d7 at kdb_backtrace+0x67
> #1 0xffffffff80b9b4b3 at vpanic+0x1a3
> #2 0xffffffff80b9b303 at panic+0x43
> #3 0xffffffff80e87345 at ffs_blkrelease_finish+0x6e5
> #4 0xffffffff80e8433d at ffs_blkfree+0xad
> #5 0xffffffff80eb10af at softdep_get_depcounts+0x48bf
> #6 0xffffffff80eb0fe5 at softdep_get_depcounts+0x47f5
> #7 0xffffffff80ea195a at softdep_update_inodeblock+0x178a
> #8 0xffffffff80eab94a at softdep_request_cleanup+0xa8a
> #9 0xffffffff80e95272 at softdep_flushworklist+0x1a2
> #10 0xffffffff80e991df at softdep_unmount+0x4af
> #11 0xffffffff80b5be83 at fork_exit+0x83
> #12 0xffffffff8105061e at fork_trampoline+0xe
> Uptime: 1m59s
> Automatic reboot in 15 seconds - press a key on the console to abort

This looks like a file system error, likely some corruption caused by
previous reboots?

Ie: I'm not sure this is caused by Xen or rather by underlying errors
in the filesystem. At least there are no hardware errors on the log
AFAICT.

Thanks, Roger.



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