If you go back a few years, you can find a thread where I reported tstile lockups on PPC. I don’t remember the details, but it was back in 6.1 as I recall. This is not a new problem, and not limited to NFS. I still have a similar problem with my 7.2 system, usually triggered when I do backups (dump/restore). The dump operation locks up and cannot be killed. The system continues, except any process that trips over the tstile also locks up. Eventually, the system grinds to a complete halt. (can’t even log in) If I catch it before that point, I can almost reboot, but I have to power cycle to kill the tstile process(es), or the reboot also hangs.
-dgl- > On Jul 31, 2019, at 9:11 AM, Jason Thorpe <thor...@me.com> wrote: > > >> On Jul 31, 2019, at 1:45 AM, Edgar Fuß <e...@math.uni-bonn.de> wrote: >> >> NetBSD design error (or so Taylor says) that a vnode lock may be held >> accross I/O > > 100% > > NetBSD's VFS locking protocol needs a serious overhaul. At least one other > BSD-family VFS (the one in XNU) completely eliminated locking of vnodes at > the VFS layer (it's all pushed into the file system back-ends who now have > more control over their own locking requirements). It does have some > additional complexities around reference / busy counting and vnode identity, > but it works very well in practice. > > I don't know what FreeBSD has done in this area. > > -- thorpej >
