frequent kernel BUG and lockups - 2.6.39 + xfs_fsr

[Marc Lehmann]

This just in, this was on screen, xfs_fsr was active at the time, kernel
is tainted:

[248359.646330] CPU 1
[248359.646326] last sysfs file: /sys/devices/virtual/net/lo/operstate
[248359.646323] Oops: 0000 [#1] SMP
[248359.646319] PGD 8b43067 PUD 1bc63067 PMD 0
[248359.646292] IP: [<ffffffffa13371ab>] xfs_trans_log_inode+0xb/0x2f [xfs]
[248359.646285] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018

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