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Date: Mon, 11 Feb 2019 13:20:42 -0800 (PST) From: David Miller <davem@...emloft.net> To: edumazet@...gle.com Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, syzkaller@...glegroups.com, andrew.hendry@...il.com, linux-x25@...r.kernel.org Subject: Re: [PATCH net] net/x25: do not hold the cpu too long in x25_new_lci() From: Eric Dumazet <edumazet@...gle.com> Date: Fri, 8 Feb 2019 12:41:05 -0800 > Due to quadratic behavior of x25_new_lci(), syzbot was able > to trigger an rcu stall. > > Fix this by not blocking BH for the whole duration of > the function, and inserting a reschedule point when possible. > > If we care enough, using a bitmap could get rid of the quadratic > behavior. > > syzbot report : ... > Signed-off-by: Eric Dumazet <edumazet@...gle.com> > Reported-by: syzbot <syzkaller@...glegroups.com> Applied, thanks.
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