[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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