Commit 4762fb98 authored Feb 11, 2015 by Jan Stancek Committed by David S. Miller Feb 12, 2015

ipv6: fix possible deadlock in ip6_fl_purge / ip6_fl_gc



Use spin_lock_bh in ip6_fl_purge() to prevent following potentially
deadlock scenario between ip6_fl_purge() and ip6_fl_gc() timer.

  =================================
  [ INFO: inconsistent lock state ]
  3.19.0 #1 Not tainted
  ---------------------------------
  inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
  swapper/5/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
   (ip6_fl_lock){+.?...}, at: [<ffffffff8171155d>] ip6_fl_gc+0x2d/0x180
  {SOFTIRQ-ON-W} state was registered at:
    [<ffffffff810ee9a0>] __lock_acquire+0x4a0/0x10b0
    [<ffffffff810efd54>] lock_acquire+0xc4/0x2b0
    [<ffffffff81751d2d>] _raw_spin_lock+0x3d/0x80
    [<ffffffff81711798>] ip6_flowlabel_net_exit+0x28/0x110
    [<ffffffff815f9759>] ops_exit_list.isra.1+0x39/0x60
    [<ffffffff815fa320>] cleanup_net+0x100/0x1e0
    [<ffffffff810ad80a>] process_one_work+0x20a/0x830
    [<ffffffff810adf4b>] worker_thread+0x11b/0x460
    [<ffffffff810b42f4>] kthread+0x104/0x120
    [<ffffffff81752bfc>] ret_from_fork+0x7c/0xb0
  irq event stamp: 84640
  hardirqs last  enabled at (84640): [<ffffffff81752080>] _raw_spin_unlock_irq+0x30/0x50
  hardirqs last disabled at (84639): [<ffffffff81751eff>] _raw_spin_lock_irq+0x1f/0x80
  softirqs last  enabled at (84628): [<ffffffff81091ad1>] _local_bh_enable+0x21/0x50
  softirqs last disabled at (84629): [<ffffffff81093b7d>] irq_exit+0x12d/0x150

  other info that might help us debug this:
   Possible unsafe locking scenario:

         CPU0
         ----
    lock(ip6_fl_lock);
    <Interrupt>
      lock(ip6_fl_lock);

   *** DEADLOCK ***

Signed-off-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 6aa6395f

net/ipv6/ip6_flowlabel.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -172,7 +172,7 @@ static void __net_exit ip6_fl_purge(struct net *net)
		{
		int i;

		spin_lock(&ip6_fl_lock);
		spin_lock_bh(&ip6_fl_lock);
		for (i = 0; i <= FL_HASH_MASK; i++) {
		struct ip6_flowlabel *fl;
		struct ip6_flowlabel __rcu **flp;
		@@ -190,7 +190,7 @@ static void __net_exit ip6_fl_purge(struct net *net)
		flp = &fl->next;
		}
		}
		spin_unlock(&ip6_fl_lock);
		spin_unlock_bh(&ip6_fl_lock);
		}

		static struct ip6_flowlabel fl_intern(struct net net,

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