b8b6e4c453
Be careful not to unconditionally clear the PF_MEMALLOC bit in the task structure. It may have already been set when entering kv_alloc() in which case it must remain set on exit. In particular the kswapd thread will have PF_MEMALLOC set in order to prevent it from entering direct reclaim. By clearing it we allow the following NULL deref to potentially occur. BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff8109c7ab>] balance_pgdat+0x25b/0x4ff Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes ZFS issue #287 |
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