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authorRobert Varga <nite@hq.alert.sk>2009-09-16 08:49:21 +0200
committerDavid S. Miller <davem@davemloft.net>2009-09-16 08:49:21 +0200
commit657e9649e745b06675aa5063c84430986cdc3afa (patch)
tree2db388ddc152c1deb4903467d9012c56b5ba8b41 /net/ipv4
parentpkt_sched: Fix qdisc_create on stab error handling (diff)
downloadlinux-657e9649e745b06675aa5063c84430986cdc3afa.tar.xz
linux-657e9649e745b06675aa5063c84430986cdc3afa.zip
tcp: fix CONFIG_TCP_MD5SIG + CONFIG_PREEMPT timer BUG()
I have recently came across a preemption imbalance detected by: <4>huh, entered ffffffff80644630 with preempt_count 00000102, exited with 00000101? <0>------------[ cut here ]------------ <2>kernel BUG at /usr/src/linux/kernel/timer.c:664! <0>invalid opcode: 0000 [1] PREEMPT SMP with ffffffff80644630 being inet_twdr_hangman(). This appeared after I enabled CONFIG_TCP_MD5SIG and played with it a bit, so I looked at what might have caused it. One thing that struck me as strange is tcp_twsk_destructor(), as it calls tcp_put_md5sig_pool() -- which entails a put_cpu(), causing the detected imbalance. Found on 2.6.23.9, but 2.6.31 is affected as well, as far as I can tell. Signed-off-by: Robert Varga <nite@hq.alert.sk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp_minisocks.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 045bcfd3f288..624c3c9b3c2b 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -363,7 +363,7 @@ void tcp_twsk_destructor(struct sock *sk)
#ifdef CONFIG_TCP_MD5SIG
struct tcp_timewait_sock *twsk = tcp_twsk(sk);
if (twsk->tw_md5_keylen)
- tcp_put_md5sig_pool();
+ tcp_free_md5sig_pool();
#endif
}