Date: Thu, 22 Feb 2001 04:20:56 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: Maxim Sobolev <sobomax@FreeBSD.org> Cc: "Alexander N. Kabaev" <ak03@gte.com>, current@FreeBSD.org, Dag-Erling Smorgrav <des@ofug.org> Subject: RE: A possible bug in the interrupt thread preemption code [Was: Message-ID: <XFMail.010222042056.jhb@FreeBSD.org> In-Reply-To: <3A94F335.6C858C2@FreeBSD.org>
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On 22-Feb-01 Maxim Sobolev wrote: > Dag-Erling Smorgrav wrote: > >> Maxim Sobolev <sobomax@FreeBSD.ORG> writes: >> > It's not an ata specific problem, but rather a problem of all ISA >> > devices (I have an ISA based ata controller). >> >> I don't think it has anything to do with ISA. I've had similar >> problems on a PCI-only system (actually, PCI+EISA motherboard with no >> EISA cards) with no ATA devices (disks, CD-ROM and streamer are all >> SCSI). >> >> Considering that backing out rev 1.14 of ithread.c eliminates the >> panics, and that that revision is supposed to enable interrupt thread >> preemption, and that the crashed kernels show signs of stack smashing, >> I'd say the cause is probably a bug in the preemption code. > > Update: the bug is still here, as of -current from 22 Feb. Hovewer, this time > it even doesn't let to boot into single-user with following panic message: > kernel trap 12 with interrupts disabled > panic: mutex sched lock recursed at ../../kern/kern_synch.c:872 Errrr. That would be something that is leaking sched_lock. Hmm... Got a backtrace? What is really annoying is that preemption has been in the kernel since Feb 1. I just accidentally turned it off in the ithread code reorganization and then turned it back on. It was off for a few hours after only being on for 2 weeks, and now everyone magically has problems. -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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