On 03/12/13 13:46, Michael L. Semon wrote:
Hi! I was running xfstests #111 under the following conditions...
(*) zeroed partitions, and
(*) a fresh mkfs.xfs for each file system, and
(1) CONFIG_XFS_DEBUG used, rtdev used, external logdev used, or
(2) CONFIG_XFS_DEBUG used, external logdev used, or
(3) CONFIG_XFS_DEBUG used, all internal, mkfs.xfs called with no options
...and I get a trace like the one below (from (3)). The trace is from
kernel 3.9.0-rc2 on an old Pentium III, using a normal VGA console on
the test PC, captured by another PC over serial cable. The trace is
part of an infinite loop that becomes finite only if I rip out the
console and VGA entirely. Overall, more is in play here than just
XFS, but I don't know to whom I should write. [A relevant question
for which I don't know the answer: Are there critical sections where
you should not use assertions or call BUG() in debug code?] Something
in XFS debug is fighting the console/VGA/framebuffer system, and I
don't know where to go from here.
You'll know you've reproduced this one because you'll need the power
button to shut the PC off, so be careful.
This is crash report; no fix is requested. I'm using the simple
workarounds "don't run xfstests #111 with XFS debugging enabled" and
"Backups! Backups! Backups!" All is well.
Thanks!
Michael
[ 1399.347056] XFS (sda12): Corruption detected. Unmount and run xfs_repair
[ 1399.353815] XFS (sda12): bad inode magic/vsn daddr 64 #8 (magic=5858)
0x58 == 'X'
[ 1399.360277] XFS: Assertion failed: 0, file: fs/xfs/xfs_inode.c, line: 416
Thanks for the report, but there is no bug here. Maybe we should list
test 111 as "dangerous".
xfstests 111 trashes the inode see xfstests/src/itrash.c:
void nuke()
{
int i;
for (i = 2048; i < 32768-1; i++)
if (buffer[i] == 'I' && buffer[i+1] == 'N') {
buffer[i] = buffer[i+1] = 'X';
printf("Overwrote IN @offset %d\n", i);
}
}
The inode verifiers are doing their job.
--Mark.
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