Date: Tue, 11 Jan 2000 16:29:16 -0800 (PST) From: sam@errno.com To: freebsd-gnats-submit@FreeBSD.org Subject: i386/16071: ata driver has a race in ata_command Message-ID: <20000112002916.8C7A015037@hub.freebsd.org>
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>Number: 16071 >Category: i386 >Synopsis: ata driver has a race in ata_command >Confidential: no >Severity: critical >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Jan 11 16:30:00 PST 2000 >Closed-Date: >Last-Modified: >Originator: Sam Leffler >Release: 4.0-CURRENT >Organization: >Environment: FreeBSD melange.errno.com 4.0-CURRENT FreeBSD 4.0-CURRENT #0: Thu Jan 6 23:50:00 GMT 2000 root@melange.errno.com:/home/sam/freebsd/src/sys/compile/MELANGE i386 >Description: ata_command (1.39) sends a command before doing a tsleep to wait for the result. If the device interrupts before tsleep is able to place the process on the sleep queue then the interrupt will be missed. >How-To-Repeat: Boot 4.0-CURRENT under vmware w/ the ata driver configured instead of the wd driver. Notice that no IDE devices are recognized; each gets a complaint: ata_command: timeout waiting for interrupt A little investigation shows the obvious race that's exasperated by operating in a pseudo-synchronous environment. >Fix: I'll let Soren (sic?) do his own. >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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