Messages in this thread |  | | Date | Thu, 17 Jan 2013 08:03:26 -0800 | From | Greg Kroah-Hartman <> | Subject | Re: [ 18/71] SUNRPC: Ensure we release the socket write lock if the rpc_task exits early |
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On Thu, Jan 17, 2013 at 01:14:59PM -0200, Herton Ronaldo Krzesinski wrote: > On Tue, Jan 15, 2013 at 02:54:15PM -0800, Greg Kroah-Hartman wrote: > > 3.0-stable review patch. If anyone has any objections, please let me know. > > > > ------------------ > > > > From: Trond Myklebust <Trond.Myklebust@netapp.com> > > > > commit 87ed50036b866db2ec2ba16b2a7aec4a2b0b7c39 upstream. > > > > If the rpc_task exits while holding the socket write lock before it has > > allocated an rpc slot, then the usual mechanism for releasing the write > > lock in xprt_release() is defeated. > > > > The problem occurs if the call to xprt_lock_write() initially fails, so > > that the rpc_task is put on the xprt->sending wait queue. If the task > > exits after being assigned the lock by __xprt_lock_write_func, but > > before it has retried the call to xprt_lock_and_alloc_slot(), then > > it calls xprt_release() while holding the write lock, but will > > immediately exit due to the test for task->tk_rqstp != NULL. > > > > Reported-by: Chris Perl <chris.perl@gmail.com> > > Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> > > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > > This is marked only for kernel versions 3.1 and later, which looks > correct as it seems to address a problem starting with commit > 43cedbf0e8dfb9c5610eb7985d5f21263e313802
Ah, good catch, I've now dropped it from the 3.0-stable queue, thanks.
greg k-h
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