Chuck Ebbert wrote: >> [ 126.754204] BUG: unable to handle kernel NULL pointer dereference at >> virtual address 00000000 >> ... > mempool_free() was called with a NULL pool. That can't be good. Yes, it is really not good :) Bug http://bugzilla.kernel.org/show_bug.cgi?id=7388 Attached patch fixes this problem, fix needed for stable tree too, this is not regression, just very old bug... Milan -- mbroz@xxxxxxxxxx -- From: Milan Broz <mbroz@xxxxxxxxxx> Flush workqueue before releasing bioset and mopools in dm-crypt. There can be finished but not yet released request. Call chain causing oops: run workqueue dec_pending bio_endio(...); <remove device request - remove mempool> mempool_free(io, cc->io_pool); This usually happens when cryptsetup create temporary luks mapping in the beggining of crypt device activation. When dm-core calls destructor crypt_dtr, no new request are possible. Signed-off-by: Milan Broz <mbroz@xxxxxxxxxx> --- drivers/md/dm-crypt.c | 2 ++ 1 file changed, 2 insertions(+) Index: linux-2.6.22/drivers/md/dm-crypt.c =================================================================== --- linux-2.6.22.orig/drivers/md/dm-crypt.c 2007-07-17 21:56:36.000000000 +0200 +++ linux-2.6.22/drivers/md/dm-crypt.c 2007-07-19 11:55:13.000000000 +0200 @@ -920,6 +920,8 @@ static void crypt_dtr(struct dm_target * { struct crypt_config *cc = (struct crypt_config *) ti->private; + flush_workqueue(_kcryptd_workqueue); + bioset_free(cc->bs); mempool_destroy(cc->page_pool); mempool_destroy(cc->io_pool); -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
