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Date: Fri, 02 Jul 2010 18:28:59 +0200
From: Jan Kiszka <jan.kiszka@siemens.com>
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Subject: [Qemu-devel] Re: [Bug 595438] Re: KVM segmentation fault,
 using SCSI+writeback and linux 2.4 guest
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To: socketpair@gmail.com
Cc: qemu-devel@nongnu.org, Bug 595438 <595438@bugs.launchpad.net>

=D0=9A=D0=BE=D1=80=D0=B5=D0=BD=D0=B1=D0=B5=D1=80=D0=B3 =D0=9C=D0=B0=D1=80=
=D0=BA wrote:
> void scsi_req_complete(SCSIRequest *req)
> {
>     assert(req->status !=3D -1);
>     req->bus->complete(req->bus, SCSI_REASON_DONE,
>                        req->tag,
>                        req->status);
> }
>=20
> (gdb) bt 1
> #0  0x0852cd88 in ?? ()
> (More stack frames follow...)
> (gdb) frame 1
> #1  0x080f0f16 in scsi_command_complete (r=3D0x86252d8, status=3D<value=
 optimized out>, sense=3D<value optimized out>)
>     at /home/mmarkk/src/KVM/qemu-kvm-0.12.3+noroms/hw/scsi-disk.c:105
> 105	    scsi_req_complete(&r->req);
> (gdb) print r->req->bus->complete
> $7 =3D (scsi_completionfn) 0x852cd88
> (gdb) disassemble 0x852cd88
> No function contains specified address.
>=20
>=20
> Corrupted memory ?
>=20

Maybe. We fixed (hopefully) a few SCSI issues that showed up after guest
reset. Those triggered "scsi-disk: Tag 0x0 already in use" as well. Does
your scenario also include such a step, e.g. to boot into the installed
kernel?

In any case, could you retest with latest qemu-kvm from git?

Thanks,
Jan

--=20
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux