Date: Wed, 30 Jun 2004 10:05:15 +0200 From: Daniel Lang <dl@leo.org> To: Colin Percival <colin.percival@wadham.ox.ac.uk> Cc: freebsd-current@freebsd.org Subject: Re: sio vs sched_lock LOR (was: Re: kern/68442: panic - acquiring duplicate lock of same type: "sleepq chain") Message-ID: <20040630080515.GE79266@atrbg11.informatik.tu-muenchen.de> In-Reply-To: <6.1.0.6.1.20040629223609.03bdfce0@popserver.sfu.ca> References: <20040628202434.GA73213@atrbg11.informatik.tu-muenchen.de> <20040629153921.GE75577@atrbg11.informatik.tu-muenchen.de> <6.1.0.6.1.20040629223609.03bdfce0@popserver.sfu.ca>
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--X3gaHHMYHkYqP6yf Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi, Colin Percival wrote on Tue, Jun 29, 2004 at 10:58:29PM -0700: [..] > Regardless of the questionable validity of the other problems this machine > is encountering, this LOR is real (and ugly). calcru() asserts that it is > holding sched_lock, but it can printf() about negative runtime or runtime > going backwards. With a serial console attached, these messages end up at > siocnputc(), which needs sio_lock. Yes, I get lots of 'calcru' messages on the console. > Now, I presume that there is some reason why the locking order hard-coded > into witness makes it illegal to pick up sio_lock while holding sched_loc= k, > but I can't see it. Maybe someone else can explain? >=20 > In the mean time, a workaround for this LOR is to unplug the serial conso= le. :-) ARGL :-) Well, if this keeps the machine from locking up, I'll try it... Best regards, Daniel --=20 IRCnet: Mr-Spock =20 - In dieser Mail ist ein Geist, der Dich in den Hintern beisst -=20 Daniel Lang * dl@leo.org * +49 89 289 18532 * http://www.leo.org/~dl/ --X3gaHHMYHkYqP6yf Content-Type: application/x-pkcs7-signature Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIIVcwYJKoZIhvcNAQcCoIIVZDCCFWACAQExCzAJBgUrDgMCGgUAMAsGCSqGSIb3DQEHAaCC EugwggcAMIIF6KADAgECAgIj0zANBgkqhkiG9w0BAQUFADByMQswCQYDVQQGEwJERTERMA8G A1UEBxMITXVlbmNoZW4xDDAKBgNVBAoTA1RVTTELMAkGA1UECxMCSU4xGDAWBgNVBAMTD1JC Ry1CZW51dHplci1DQTEbMBkGCSqGSIb3DQEJARYMY2FAaW4udHVtLmRlMB4XDTA0MDQyMzEz MTU1OFoXDTA1MDUzMTAwMDAwMFowdzELMAkGA1UEBhMCREUxETAPBgNVBAcTCE11ZW5jaGVu MQwwCgYDVQQKEwNUVU0xCzAJBgNVBAsTAklOMRQwEgYDVQQDEwtEYW5pZWwgTGFuZzEkMCIG CSqGSIb3DQEJARYVZGFuaWVsLmxhbmdAaW4udHVtLmRlMIIBIjANBgkqhkiG9w0BAQEFAAOC AQ8AMIIBCgKCAQEAs1d9JUkGBG8T4m1wlzqfK2IU6pEZQcA00/hX1hlAVY5Jwv18rJncrOym 1dXSLubRIWZEEDRDPYCK0RhGHtaBYOTZpBSWezVkC2g6ioWS9wsnJpk0GIJN+o+k9L7+3vzE 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