Re: [alpha] repeated Oops

[Michael Cree <mcree@orcon.net.nz>]

On Mon, Mar 25, 2013 at 07:13:35AM -0500, Bob Tracy wrote:
> Getting lots of these since attempting to upgrade past 3.8.0-rc7.  I
> *don't* think it's a kernel issue at this point, because while older
> kernels (found an old 3.5.0-rc4 setup from about a year ago in my archives)
> seem to take longer to reach this point, they'll eventually die exactly the
> same way.

Presumably the older kernel has worked reliably at some stage?

> In other words, either my old hardware is starting to go bye-bye,
> or something critical in userspace (libraries?) is horribly broken since the
> last round of package updates (Debian unstable for alpha).

Recently updated Debian unstable has been working fine on my Alphas including 
a PWS.  I have not seen the kernel paging request problems for some time now;
I saw them in the past when linking huge libraries that exercised virtual
memory when running kernels older than about 3.2.23.

How about the Debian supplied generic kernel?  That should work (except
that the radeon module may not load leaving the console in a VGA mode).
Testing a stable kernel is probably a good idea at this stage.

> (System currently powered-down.  Will open the case later and go looking
> for clogged/bad cooling fans, cat fur, etc.)

Good idea.  Check motherboard is well seated into I/O board.  Check memory 
is all well seated.  Doing that got me some extra life out of my PWS!

Good luck!

Cheers
Michael.

> The process running at the time will vary, but the commonality I've
> noticed is "lots of disk I/O".  Examples: cpio, applying the 3.9.0-rc1
> kernel patch (approx. 40 MB uncompressed), running "git pull" on a local
> kernel source repository where v3.8 was the most recent tag, the final link
> of vmlinux on a kernel build, and so forth.
> 
> Reminder: this is a DEC Alpha system (PWS 433au).
> 
> Unable to handle kernel paging request at virtual address 0000000000000010
> cpio(4445): Oops 0
> pc = [<fffffc0000315d1c>]  ra = [<fffffc000031e2bc>]  ps = 0007    Not tainted
> pc is at process_mcheck_info+0x4c/0x320
> ra is at cia_machine_check+0x9c/0xb0
> v0 = 0000000000000004  t0 = 0000000000000630  t1 = 0000000000000630
> t2 = 0000000000000001  t3 = fffffc0000000000  t4 = fffffc00425ede38
> t5 = fffffc00425ee000  t6 = 0000000000245b15  t7 = fffffc0042dbc000
> s0 = 0000000000000000  s1 = fffffc00009ce258  s2 = fffffc00422b2498
> s3 = fffffc0042dbfb68  s4 = 0000000000000002  s5 = 0000000000000002
> s6 = 0000000000000002
> a0 = 0000000000000630  a1 = 0000000000000000  a2 = fffffc00008aeb4c
> a3 = 0000000000000000  a4 = fffffc0042dbfb68  a5 = fffffc0042dbfb58
> t8 = 0000000000000001  t9 = 0000000000245b15  t10= fffffc00422b23b8
> t11= 0000000000245b15  pv = fffffc0000315cd0  at = fffffc0042dbf878
> gp = fffffc0000a0d0d8  sp = fffffc0042dbf8a0
> Disabling lock debugging due to kernel taint
> Trace:
> [<fffffc000031e2bc>] cia_machine_check+0x9c/0xb0
> [<fffffc000042fb40>] ext3_get_blocks_handle+0xe0/0xd00
> [<fffffc0000315c70>] do_entInt+0x180/0x1e0
> [<fffffc0000372704>] mempool_alloc_slab+0x24/0x40
> [<fffffc0000310dc0>] ret_from_sys_call+0x0/0x10
> [<fffffc00003729a0>] mempool_alloc+0x50/0x170
> [<fffffc00003f18c4>] do_mpage_readpage+0x344/0x7e0
> [<fffffc00004fb220>] __constant_c_memset+0x0/0x50
> [<fffffc00004fb288>] loop+0x8/0x10
> [<fffffc00003f1ee8>] mpage_readpages+0xf8/0x1c0
> [<fffffc0000430760>] ext3_get_block+0x0/0x170
> [<fffffc00004f0b3c>] radix_tree_insert+0x1ac/0x2f0
> [<fffffc000036f550>] add_to_page_cache_locked+0xb0/0x180
> [<fffffc00003f1eb8>] mpage_readpages+0xc8/0x1c0
> [<fffffc0000430760>] ext3_get_block+0x0/0x170
> [<fffffc000042c19c>] ext3_readpages+0x2c/0x40
> [<fffffc00004545b0>] journal_stop+0x160/0x300
> [<fffffc00004758d4>] security_file_open+0xa4/0xb0
> [<fffffc000037b22c>] __do_page_cache_readahead+0x1fc/0x320
> [<fffffc000037b798>] ra_submit+0x38/0x50
> [<fffffc000037182c>] generic_file_aio_read+0x51c/0x800
> [<fffffc00003adefc>] do_sync_read+0x9c/0x110
> [<fffffc00003ae764>] vfs_read+0xb4/0x1c0
> [<fffffc00004754e8>] security_file_permission+0xd8/0x110
> [<fffffc00003ae204>] rw_verify_area+0x64/0x120
> [<fffffc00003ae734>] vfs_read+0x84/0x1c0
> [<fffffc00003ae8dc>] SyS_read+0x6c/0xc0
> [<fffffc0000310da4>] entSys+0xa4/0xc0
> 
> Code: a75e0000  a53e0008  a55e0010  23de0020  6bfa8001  a55d0158 <a2910010> 261dffea
> 
> Thanks in advance for an assist in figuring out what's going on here.
> 
> --Bob