On (01/23/18 07:43), Tejun Heo wrote: > > > > We can have more. But if printk is causing printks, that's a major bug. > > And work queues are not going to fix it, it will just spread out the > > pain. Have it be 100 printks, it needs to be fixed if it is happening. > > And having all printks just generate more printks is not helpful. Even > > if we slow them down. They will still never end. > > So, at least in the case that we were seeing, it isn't that black and > white. printk keeps causing printks but only because printk buffer > flushing is preventing the printk'ing context from making forward > progress. The key problem there is that a flushing context may get > pinned flushing indefinitely and using a separate context does solve > the problem. Hello Tejun, I'm willing to take a look at those printk()-s from console drivers. Any chance you can send me some of the backtraces you see [the most common/disturbing]? -ss
