Date: Fri, 15 Apr 2005 20:13:10 -0700 (PDT) From: Doug White <dwhite@gumbysoft.com> To: Mikhail Teterin <mi@corbulon.video-collage.com> Cc: stable@FreeBSD.org Subject: Re: reliable "panic: isa_dmastart: bad bounce buffer" Message-ID: <20050415200656.N38788@carver.gumbysoft.com> In-Reply-To: <200504130314.j3D3EjrT043747@corbulon.video-collage.com> References: <200504130314.j3D3EjrT043747@corbulon.video-collage.com>
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On Tue, 12 Apr 2005, Mikhail Teterin wrote: > Hello! > > Whenever I try to mount a floppy disk: > > mount -t msdosfs /dev/fd0 /mnt > > I get: > > panic: isa_dmastart: bad bounce buffer > > The OS is FreeBSD-5.4-STABLE from last night, amd64. dmesg attached. Probably related to: fdc0: <floppy drive controller (FDE)> port 0x3f7,0x3f0-0x3f5 irq 6 drq 2 on acpi0 isa_dmainit(2, 40960) failed fd0: <1440-KB 3.5" drive> on fdc0 drive 0 That message is printed by isa_dmainit() in src/sys/amd64/isa/isa_dma.c. You might instrument that function and see where its blowing up. I suspect its getting the buffer from malloc() but the range check below it fails. -- Doug White | FreeBSD: The Power to Serve dwhite@gumbysoft.com | www.FreeBSD.org
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