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authorRobert Varga <nite@hq.alert.sk>2009-09-15 23:49:21 -0700
committerDavid S. Miller <davem@davemloft.net>2009-09-15 23:49:21 -0700
commit657e9649e745b06675aa5063c84430986cdc3afa (patch)
tree2db388ddc152c1deb4903467d9012c56b5ba8b41 /include/keys
parent7c64b9f3f584008000cf3b960f25cd6a68fce191 (diff)
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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>
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