On 03/07/2013 11:19 AM, Mateusz Guzik wrote:
On Tue, Mar 05, 2013 at 10:54:56AM -0800, Ben Greear wrote:In doing some CIFS testing (utilizing it's feature to bind to local address..but not sure that matters), we saw this error when trying to un-mount. Our kernel is patched (nfs, some networking related patches), but there are no out-of-kernel patches to CIFS, so I don't *think* this is anything we could have caused. This problem appears to be easily reproducible, so we will be happy to test patches if anyone has any suggestions. BUG: Dentry ffff8800c07e43c0{i=45762,n=cifs2-01.7.lf-data} still in use (1) [unmount of cifs cifs]We encountered similar panic, but it was related to writes. In our case the problem was that some cifsInodeInfo holding dentry references were still around (in slow-work queue) during superblock destruction in unmount. I reproduced the problem on 3.8 kernel (sorry, no 3.7 handy) with reads as well, which should match your scenario. I attached a patch that deals with this problem by grabbing refcounts to cifs superblock on cifsInodeInfo creation. This delays sb destruction until all cifsInodeInfos are gone. I didn't test it on 3.7.10 kernel but it should work fine.
The 3.7.10 patch applied cleanly and appears to fix our problem. Thanks so much for the patch! Ben -- Ben Greear <greearb@xxxxxxxxxxxxxxx> Candela Technologies Inc http://www.candelatech.com -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
