Re: All processes go tstile

[David Holland <dholland-tech%netbsd.org@localhost>]

On Thu, Aug 16, 2018 at 10:03:11AM +0200, J. Hannken-Illjes wrote:
 > > sleepq_block
 > > cv_wait
 > > fstrans_start
 > > VOP_BWRITE
 > > getnewbuf
 > > getblk
 > > bio_doread
 > > bread
 > > ffs_update.part.3
 > > ffs_sync
 > > VFS_SYNC
 > > sched_sync
 > > 
 > > If I understand correctly, that means a n I/O that never completed, right?
 > 
 > Looks like a deadlock where we sync a file system, need a new buffer
 > and try to free a buffer on a currently suspending file system.
 > 
 > VFS_SYNC and VOP_BWRITE should be on different mounts here.

Side note: what if there isn't a second mount? Not sure that's a good
enough way to deal with this case...

-- 
David A. Holland
dholland%netbsd.org@localhost