On 7/19/2011 7:31 AM, Garrett Cooper wrote:
On Tue, Jul 19, 2011 at 4:58 AM, Garrett Cooper<[email protected]> wrote:
On Mon, Jul 18, 2011 at 5:19 PM, Brandon Falk<[email protected]> wrote:
On 7/18/2011 10:18 AM, Andriy Gapon wrote:
on 18/07/2011 17:53 Brandon Falk said the following:
Hello,
In recent branches (confirmed with 224119) builds compiled with clang
happen to
throw 'Unknown error: -512' in a lot of places, making the system
unusable.
(Untested on gcc compiled systems). Originally I thought the problem was
with
specific programs, then I narrowed it down to file I/O, and now I've
narrowed it
down to open() with O_TRUNC. Without O_TRUNC there seems to be no issues
whatsoever. With O_TRUNC on open() it fails with that 'Unknown error:
-512' every
other time you run the program. Common issues, portsnap is affected,
making it
impossible to fetch/extract ports. As well as redirecting output in
shells eg
`echo 'hi'> test` fails every other try. You have the same issue with
text
editors like `edit` where it fails every other save. There are no issues
with
`echo 'hi'>> test` as there is no O_TRUNC, it only seems to be an
O_TRUNC error.
Any tips? Otherwise I'll be looking into this today myself.
Just a hint that you could try using DTrace syscall and fbt providers to
see where
in kernel (if in kernel) that -512 return value originates.
Update:
I've traced more and more into the kernel, and currently I have found the
following trace:
ufs_setattr() (in sys/ufs/ufs/ufs_vnops.c:507)
(In truncate a bunch of stuff is done, but it succeeds until VOP_SETATTR)
vn_truncate() (in sys/kern/vfs_vnops.c:636)
kern_openat() (in sys/kern/vfs_syscalls.c:1043)
kern_open() (in sys/kern/vfs_syscalls.c:1035)
open() (in sys/kern/vfs_syscalls.c:1006)
ufs_setattr() returns with -1 (EPERM)
I'll continue to try to find the exact problem. A quick workaround currently
would probably be to use a different filesystem other than ufs, but then
again, I have no clue if other filesystems have the same issue.
Hopefully that trace will help anyone who wants to help out.
What UFS options do you have defined in your kernel?
Also, what does mount say and have you tried running as root?
Thanks,
-Garrett
Garrett,
I am running as root. No issues with the mounting. As for options, which
do you want?
-Brandon Falk
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