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Date: Wed, 30 Dec 2015 08:55:00 -0500 From: Eric Dumazet <eric.dumazet@...il.com> To: Nicolai Stange <nicstange@...il.com> Cc: Andy Lutomirski <luto@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Network Development <netdev@...r.kernel.org>, Dmitry Vyukov <dvyukov@...gle.com>, Eric Dumazet <edumazet@...gle.com>, "David S. Miller" <davem@...emloft.net>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: Linux 4.4-rc4 regression, bisected to "net: fix sock_wake_async() rcu protection" On Wed, 2015-12-30 at 12:32 +0100, Nicolai Stange wrote: > Andy Lutomirski <luto@...nel.org> writes: > > > On recent v4.4-rc releases, I can't run emacs. No, really, running > > "emacs" in a GNOME 3 session makes gnome-shell think that emacs is > > running, but no window is drawn, and the overall system UI is a bit > > weird when the invisible emacs window is focused. > > > > This is 100% reproducible. > > > > There might be other symptoms involving gdb malfunctioning, but those > > are, at best, sporadic. The emacs failure is entirely reliable. I > > have no idea what the underlying failure mode is, but failure to wake > > a socket waiter seems plausible, I also have no idea why oocalc, > > gimp, vim, gedit, firefox, etc aren't affected. > > > > A somewhat unorthodox "git bisect" run blames: > > > > commit ceb5d58b217098a657f3850b7a2640f995032e62 > > Author: Eric Dumazet <edumazet@...gle.com> > > Date: Sun Nov 29 20:03:11 2015 -0800 > > > > net: fix sock_wake_async() rcu protection > > > > I've confirmed that v4.4-rc7 with that patch reverted works fine. > > > > Since the offending commit was apparently a security fix, simply > > reverting it might not be the best idea. > > Please have a look at https://lkml.kernel.org/g/87ege73bma.fsf@gmail.com > > I ran into the same issue and this one fixes it for me. Right, and the ozlabs pointers for this were : v1: https://patchwork.ozlabs.org/patch/561194/ v2: https://patchwork.ozlabs.org/patch/561553/ Thanks. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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