On Fri, 18 Jan 2008 15:59:43 -0500 "J. Bruce Fields" <[EMAIL PROTECTED]> wrote:
> On Mon, Jan 14, 2008 at 09:05:15AM -0500, Jeff Layton wrote: > > Move the initialzation in __svc_create_thread that happens prior to > > thread creation to a new function. Export the function to allow > > services to have better control over the svc_rqst structs. > > > > Also rearrange the rqstp initialization to prevent NULL pointer > > dereferences in svc_exit_thread in case allocations fail. > > Those NULL dereferences are from the > > list_del(&rqstp->rq_all); > > ? OK, make sense. Thanks! > > --b. > Sorry, I didn't explain that well... This was the problem that Neil pointed out with the existing code. If the rqstp kzalloc succeeds, but the later kmallocs in __svc_create_thread fail, we goto here: out_thread: svc_exit_thread(rqstp); svc_exit_thread does this: struct svc_pool *pool = rqstp->rq_pool; ...and then later: spin_lock_bh(&pool->sp_lock); ...but rq_pool is set after the kmallocs, so if they fail rq_pool will be NULL, and we'll oops in that spin_lock_bh(). The fix is to move the kmallocs closer to the bottom in the new svc_prepare_thread function. Thanks, -- Jeff Layton <[EMAIL PROTECTED]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/