From: Antoine Martin <antoine@nagafix.co.uk>
To: Michael Tokarev <mjt@tls.msk.ru>, kvm@vger.kernel.org
Subject: Re: raw disks no longer work in latest kvm (kvm-88 was fine)
Date: Mon, 08 Mar 2010 00:11:27 +0700 [thread overview]
Message-ID: <4B93DE3F.4090103@nagafix.co.uk> (raw)
In-Reply-To: <4B93C2F9.7030904@msgid.tls.msk.ru>
[snip]
> Ok, this is in fact different problem, not the one I referred you
> initially (which was in fact good too, because apparently Christoph
> solved that bug for me and for other Debian users, thank you!).
>
Yes, I believe I had this issue too originally, which is why I was
testing 0.12.3 to see if it would fix the problem... and I hit this new
seemingly unrelated snag.
> In your case, recalling your initial email:
>
>> With qemu-kvm-0.12.3:
>> ./qemu-system-x86_64 [..] -drive file=/dev/sdc9,if=virtio,cache=none [..]
>> [ 1.882843] vdc:
>> [ 2.365154] udev: starting version 146
>> [ 2.693768] end_request: I/O error, dev vdc, sector 126
>> [ 2.693772] Buffer I/O error on device vdc, logical block 126
>> [ 2.693775] Buffer I/O error on device vdc, logical block 127
>> [ 2.693777] Buffer I/O error on device vdc, logical block 128
>>
> ...
>
> the problem happens right at startup, it can't read _anything_
> at all from the disk. In my case, the problem is intermittent
> and happens under high load only, hence the big difference.
>
> But anyway, this is something which should be easy to find
> out. Run kvm under `strace -f' and see how it opens the
>
> device, or find out with lsof what filedescriptor corresponds
> to the file in question (in running kvm instance) and see
> flags in /proc/$kvm_pid/fdinfo/$fdnum.
>
[...]
stat("./vm/var_fs", {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 41), ...}) = 0
open("./vm/var_fs", O_RDWR|O_DIRECT|O_CLOEXEC) = 12
lseek(12, 0, SEEK_END) = 1321851815424
[..]
So it opens it the device without problems.
The only things that stands out is this before the "read failed" message:
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9121] pread(12, 0x7fa50a0e47d0, 2048, 0) = -1 EINVAL (Invalid
argument)
===================
Below is the full grep for "(12,"
[pid 9097] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9097] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9097] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9097] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9097] lseek(12, 0, SEEK_SET) = 0
[pid 9097] read(12,
"\240\246E\32\r\21\367c\212\316Xn\177e'\310}\234\1\273`\371\266\247\r\1nj\332\32\221\26"...,
512) = 512
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9111] pread(12,
"\240\246E\32\r\21\367c\212\316Xn\177e'\310}\234\1\273`\371\266\247\r\1nj\332\32\221\26"...,
4096, 0) = 4096
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9157] pread(12, 0x7fa4f80b13d0, 64512, 0) = -1 EINVAL (Invalid
argument)
[pid 9098] lseek(12, 0, SEEK_END <unfinished ...>
[pid 9137] pread(12, 0x7fa5020c53d0, 64512, 64512) = -1 EINVAL (Invalid
argument)
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9138] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9143] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9123] pread(12, 0x7fa5090defd0, 16384, 0) = -1 EINVAL (Invalid
argument)
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9126] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9125] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9127] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9128] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9129] pread(12,
"?=\321\301\250\357\215\236\325{N\306\246\346=\23\266b\3556z\376\234\251\v,cG\371\302\340~"...,
512, 4096) = 512
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9146] pread(12,
"\240\246E\32\r\21\367c\212\316Xn\177e'\310}\234\1\273`\371\266\247\r\1nj\332\32\221\26"...,
2048, 0) = 2048
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9115] pread(12, 0x7fa50d0e6fd0, 16384, 0) = -1 EINVAL (Invalid
argument)
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9117] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9116] pread(12,
"=\206\5\355\35\2\2610\33\271\355\300qm\2174K\366\340ng\23\311\210Gg\220m\27\33E\254"...,
512, 1321851748352) = 512
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9118] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9119] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9120] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9121] pread(12, 0x7fa50a0e47d0, 2048, 0) = -1 EINVAL (Invalid
argument)
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9153] pread(12, 0x7fa4fa0c0fd0, 16384, 0) = -1 EINVAL (Invalid
argument)
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9132] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9154] pread(12,
"=\206\5\355\35\2\2610\33\271\355\300qm\2174K\366\340ng\23\311\210Gg\220m\27\33E\254"...,
512, 1321851748352) = 512
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9155] pread(12, "iQ\35
\271O\203vj\ve[Ni}\355\263\272\4#yMo\266.\341\21\340Y5\204\20"..., 512,
1321851805696) = 512
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9133] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9134] pread(12,
"?=\321\301\250\357\215\236\325{N\306\246\346=\23\266b\3556z\376\234\251\v,cG\371\302\340~"...,
512, 4096) = 512
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9156] pread(12,
"\240\246E\32\r\21\367c\212\316Xn\177e'\310}\234\1\273`\371\266\247\r\1nj\332\32\221\26"...,
2048, 0) = 2048
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9117] pread(12, 0x7fa50c0e4fd0, 16384, 0) = -1 EINVAL (Invalid
argument)
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9116] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9118] pread(12,
"=\206\5\355\35\2\2610\33\271\355\300qm\2174K\366\340ng\23\311\210Gg\220m\27\33E\254"...,
512, 1321851748352) = 512
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9119] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9120] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9121] pread(12,
"?=\321\301\250\357\215\236\325{N\306\246\346=\23\266b\3556z\376\234\251\v,cG\371\302\340~"...,
512, 4096) = 512
[pid 9098] lseek(12, 0, SEEK_END <unfinished ...>
[pid 9122] pread(12,
"\240\246E\32\r\21\367c\212\316Xn\177e'\310}\234\1\273`\371\266\247\r\1nj\332\32\221\26"...,
2048, 0) = 2048
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9207] pread(12, 0x7fa50e0e8fd0, 16384, 0) = -1 EINVAL (Invalid
argument)
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9201] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9199] pread(12,
"=\206\5\355\35\2\2610\33\271\355\300qm\2174K\366\340ng\23\311\210Gg\220m\27\33E\254"...,
512, 1321851748352) = 512
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9210] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9208] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9203] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9200] pread(12, 0x7fa5098e37d0, 2048, 0) = -1 EINVAL (Invalid
argument)
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9200] pread(12, 0x7fa5098dffd0, 16384, 0) = -1 EINVAL (Invalid
argument)
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9209] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9202] pread(12,
"=\206\5\355\35\2\2610\33\271\355\300qm\2174K\366\340ng\23\311\210Gg\220m\27\33E\254"...,
512, 1321851748352) = 512
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9207] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9201] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9199] pread(12, <unfinished ...>
[pid 9098] lseek(12, 0, SEEK_END) = 1321851815424
[pid 9210] pread(12, <unfinished ...>
Cheers
Antoine
> I guess it can't open the image in read-write mode somehow.
>
> By the way, iothread doesn't really work in kvm, as far
> as I can see.
>
> Thanks.
>
> /mjt
> --
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>
next prev parent reply other threads:[~2010-03-07 17:11 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-06 20:48 raw disks no longer work in latest kvm (kvm-88 was fine) Antoine Martin
2010-03-06 21:28 ` Michael Tokarev
2010-03-07 4:14 ` Antoine Martin
2010-03-07 9:32 ` Michael Tokarev
2010-03-07 10:00 ` Christoph Hellwig
2010-03-07 13:12 ` Antoine Martin
2010-03-07 13:52 ` Antoine Martin
2010-03-07 15:15 ` Michael Tokarev
2010-03-07 17:11 ` Antoine Martin [this message]
2010-03-07 17:18 ` Avi Kivity
2010-03-07 17:21 ` Christoph Hellwig
2010-03-07 17:30 ` Avi Kivity
2010-03-07 17:34 ` Christoph Hellwig
2010-03-07 18:43 ` raw disks no longer work in latest kvm (kvm-88 was fine) [SOLVED] Antoine Martin
2010-03-07 18:55 ` Avi Kivity
2010-03-07 18:01 ` raw disks no longer work in latest kvm (kvm-88 was fine) Antoine Martin
2010-03-07 18:47 ` Avi Kivity
2010-03-07 19:07 ` Antoine Martin
2010-03-07 19:10 ` Avi Kivity
2010-03-07 19:13 ` Antoine Martin
2010-03-07 19:17 ` Avi Kivity
2010-03-07 19:25 ` Antoine Martin
2010-03-07 19:35 ` Avi Kivity
2010-03-13 9:51 ` Antoine Martin
2010-03-14 7:34 ` Avi Kivity
2010-04-08 22:00 ` Antoine Martin
2010-05-22 10:44 ` Antoine Martin
2010-05-22 11:17 ` Michael Tokarev
2010-05-22 11:35 ` Antoine Martin
2010-05-23 8:53 ` Antoine Martin
2010-05-23 11:57 ` Avi Kivity
2010-05-23 14:07 ` Antoine Martin
2010-05-23 14:18 ` Avi Kivity
2010-05-23 14:43 ` Antoine Martin
2010-05-23 14:53 ` Antoine Martin
2010-05-23 14:56 ` Avi Kivity
2010-05-23 15:06 ` Antoine Martin
2010-05-23 15:12 ` Avi Kivity
2010-05-23 16:18 ` Antoine Martin
2010-05-23 17:47 ` Stefan Hajnoczi
2010-05-29 9:42 ` Antoine Martin
2010-05-29 9:55 ` Stefan Hajnoczi
2010-05-29 10:34 ` Christoph Hellwig
2010-05-29 11:06 ` Stefan Hajnoczi
2010-05-29 10:34 ` Christoph Hellwig
2010-03-07 19:09 ` Asdo
2010-03-07 19:11 ` Antoine Martin
2010-03-07 19:12 ` Avi Kivity
2010-03-07 16:21 ` Avi Kivity
2010-03-08 16:45 ` Anthony Liguori
2010-03-07 9:36 ` Gleb Natapov
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