On Sat, Dec 13, 2014 at 02:59:43PM -0800, Linus Torvalds wrote: > Side note: I think I've found a real potential lockup bug in > fs/namespace.c, but afaik it could only trigger with the RT patches.
> Except it won't with the RT patches, I guess. So it looks like you could > have:\ > > - mnt_make_readonly() sets that bit > - gets preempted with the RT patches > - we run mnt_want_write() on all CPU's, which disables preemption and > waits for the bit to be cleared > - nothing happens. > > This is clearly not what happens in your lockup, but it does seem to > be a potential issue for the RT kernel. > > Added Al and Thomas to the cc, for fs/namespace.c and RT kernel > respectively. Maybe the RT patches already fix this, I didn't actually > check. I agree that it's a thing to keep in mind on the RT side of things, but IMO it belongs in RT patches... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
