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List:       linux-kernel
Subject:    Re: ENOSYS, CD-ROM, and SMP oopses
From:       George <greerga () nidhogg ! ham ! muohio ! edu>
Date:       1998-08-12 21:59:39
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On Wed, 12 Aug 1998, Meelis Roos wrote:

>G> My previously reported flood of oops' after I removed a single Pentium from
>G> my Tyan Tomcat IV go away if I use 'nosmp' on the command line.  Something
>G> isn't quite happy in the SMP code if it only gets one processor now...
>
>G> mount("/dev/hdc", "/mnt/cdrom", "iso9660", 0xc0ed0000, 0x80541f0) = -1
>G> ENOSYS (Function not implemented)
>G> mount("/dev/hdc", "/mnt/cdrom", "iso9660", 0xc0ed0000, 0x80541f0) = -1
>G> ENOSYS (Function not implemented)
>G> mount("/dev/hdc", "/mnt/cdrom", "iso9660", 0xc0ed0000, 0x80541f0) = -1
>G> ENOTBLK (Block device required)
>
>This looks _very similar_ to the amd mounting problems that happen since 114.
>I got ENOSYS errors on mount syscall too. UP kernel.
>The scheduler was changed and some mount stuff broke.
>As a temporary workaround you might try to back out the sched.c changes in
>2.1.114 (2 first hunks of sched.c changes).

I had the same problem with 2.1.110 anyway.  Something in the dcache
(lookup_dentry) oops's on the request_module call so I can get ENOSYS on
basically anything modularized.  klogd trying to load Unix sockets causes a
flood of messages until I hit ALT+SysRQ+E.

Something broken in the 2.1.x SMP (2.0.x SMP works fine) single processor
area?

-George


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