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[Bug 462269] NBD: deadlock in kernel 2.6.27.7 not present in 2.6.25.18
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Wed, 24 Dec 2008 07:03:10 -0700 (MST)
  • Message-id: <20081224140310.66F43245390@xxxxxxxxxxxxxxxxxxxxxx>
https://bugzilla.novell.com/show_bug.cgi?id=462269

User jnelson-suse@xxxxxxxxxxx added comment
https://bugzilla.novell.com/show_bug.cgi?id=462269#c1





--- Comment #1 from Jon Nelson <jnelson-suse@xxxxxxxxxxx> 2008-12-24 07:03:09
MST ---
The following is an strace taken from a machine running 2.6.25.18, executing
the 'dd if=/dev/nbd0 of=/dev/null' command.

The server was rebooted with 'reboot -fn' very shortly before this portion of
the strace:

07:57:56.568319 write(1,
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) =
512 <0.000180>
07:57:56.568648 read(0,
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) =
512 <0.000185>
07:57:56.568986 write(1,
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) =
512 <0.000144>
07:57:56.569268 read(0,
^^^ this is where it hangs. This is expected.

0x8059000, 512) = -1 EIO (Input/output error) <161.315346>

^^ it hung for approx. 161 seconds. I was expecting something more like 30
seconds (I used timeout=30 in the setup command) but 161 seconds is better than
"forever" ;-)


08:00:37.884925
open("/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/coreutils.mo",
O_RDONLY) = -1 ENOENT (No such file or directory) <0.000044>
08:00:37.885143 open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/coreutils.mo",
O_RDONLY) = -1 ENOENT (No such file or directory) <0.000034>
08:00:37.885292
open("/usr/share/locale-bundle/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY)
= -1 ENOENT (No such file or directory) <0.000034>
08:00:37.885440
open("/usr/share/locale-langpack/en_US.utf8/LC_MESSAGES/coreutils.mo",
O_RDONLY) = -1 ENOENT (No such file or directory) <0.000032>


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