search for: sysfs_notify_dirent_safe

On Sun, Jun 29, 2014 at 11:26:37AM +0300, Michael S. Tsirkin wrote: > On Fri, Jun 27, 2014 at 07:57:38AM -0400, Josh Boyer wrote: > > Hi All, > > > > We've had a report[1] of the virt_blk driver causing a lot of spew > > because it's calling a sleeping function from an invalid context. The > > backtrace is below. This is with kernel

On Sun, Jun 29, 2014 at 11:26:37AM +0300, Michael S. Tsirkin wrote: > On Fri, Jun 27, 2014 at 07:57:38AM -0400, Josh Boyer wrote: > > Hi All, > > > > We've had a report[1] of the virt_blk driver causing a lot of spew > > because it's calling a sleeping function from an invalid context. The > > backtrace is below. This is with kernel

...o be called > from irq context. The problem is that the MD bio end_io handler is calling > a sleeping function. Not sure if that's a bug in MD though given the > kernfs symbols in the all trace and the recent churn in that area. My understanding is this: bitmap_endwrite -> calls sysfs_notify_dirent_safe under spinlock -> calls kernfs_notify which takes a mutex. So I am guessing it is this commit: commit d911d98748018f7c8facc035ba39c30f5cce6f9c Author: Tejun Heo <tj at kernel.org> Date: Wed Apr 9 11:07:31 2014 -0400 kernfs: make kernfs_notify() trigger inotify events too Tejun,...

...ntext. The problem is that the MD bio end_io handler is calling >> a sleeping function. Not sure if that's a bug in MD though given the >> kernfs symbols in the all trace and the recent churn in that area. > > My understanding is this: > > bitmap_endwrite -> calls sysfs_notify_dirent_safe under spinlock > -> calls kernfs_notify which takes a mutex. > > So I am guessing it is this commit: > > commit d911d98748018f7c8facc035ba39c30f5cce6f9c > Author: Tejun Heo <tj at kernel.org> > Date: Wed Apr 9 11:07:31 2014 -0400 > > kernfs: make kernfs...

...ntext. The problem is that the MD bio end_io handler is calling >> a sleeping function. Not sure if that's a bug in MD though given the >> kernfs symbols in the all trace and the recent churn in that area. > > My understanding is this: > > bitmap_endwrite -> calls sysfs_notify_dirent_safe under spinlock > -> calls kernfs_notify which takes a mutex. > > So I am guessing it is this commit: > > commit d911d98748018f7c8facc035ba39c30f5cce6f9c > Author: Tejun Heo <tj at kernel.org> > Date: Wed Apr 9 11:07:31 2014 -0400 > > kernfs: make kernfs...