Date: Wed, 04 Dec 2002 15:02:46 -0800 From: Lars Eggert <larse@ISI.EDU> To: Alfred Perlstein <alfred@FreeBSD.org> Cc: Kris Kennaway <kris@obsecurity.org>, current@FreeBSD.org, tanimura@FreeBSD.org Subject: Re: Lock order reversals in sys_pipe.c and kern_sig.c Message-ID: <3DEE8996.70602@isi.edu> In-Reply-To: <20021118190819.GK12906@rot13.obsecurity.org> References: <20021118190819.GK12906@rot13.obsecurity.org> <20021118193901.GA16066@elvis.mu.org>
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This is a cryptographically signed message in MIME format. --------------ms090804000600080702000809 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Alfred Perlstein wrote: > * Kris Kennaway [021118 11:06] wrote: > > >I've just turned witness back on on the bento cluster, and got the > >following lock order reversals a number of times overnight: > > > >Nov 18 07:45:40 gohan11 kernel: 1st 0xc6887200 pipe mutex (pipe > mutex) @ /local0/src-client/sys/kern/sys_pipe.c:465 > >Nov 18 07:45:40 gohan11 kernel: 2nd 0xc0447780 sigio lock (sigio > lock) @ /local0/src-client/sys/kern/kern_sig.c:2225 > >Nov 18 10:28:47 gohan10 kernel: 1st 0xc4941580 pipe mutex (pipe > mutex) @ /local0/src-client/sys/kern/sys_pipe.c:1038 > >[...] > > > >Are these known problems? > > > Well now they are, I will investigate as time permits. FYI, just got a similar one yesterday on an up-to-date -current: lock order reversal 1st 0xc784d700 pipe mutex (pipe mutex) @ /usr/src/sys/kern/sys_pipe.c:465 2nd 0xc0513840 sigio lock (sigio lock) @ /usr/src/sys/kern/kern_sig.c:2225 Lars -- Lars Eggert <larse@isi.edu> USC Information Sciences Institute --------------ms090804000600080702000809 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJtjCC AzgwggKhoAMCAQICEGZFcrfMdPXPY3ZFhNAukQEwDQYJKoZIhvcNAQEEBQAwgdExCzAJBgNV BAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEaMBgG A1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRpb24gU2Vydmlj ZXMgRGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBDQTErMCkG CSqGSIb3DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMDA4MzAwMDAw 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