Comments on: RFT: “ubd=mmap” experimental config option

By: caker

caker — Mon, 12 Jan 2004 20:03:29 +0000

Sounds like Jeff knows what to look for (from #uml)…

[code]13:05 < caker> jdike: anything else I can provide on the ubd=mmap corruption issue?
13:33 < jdike> caker: I've seen problems, so I've got something to chase
13:33 < jdike> caker: namely pages of zeros which shouldn't be[/code]
-Chris

By: dmuench

dmuench — Mon, 12 Jan 2004 12:32:40 +0000

Not a problem, I was prepared if it had gone worse. I saw your email, I’ll be interested to see if they can track down the problem.. It’s an interesting option that I’d like to use on my non-linode UML’s as well.

By: caker

caker — Sun, 11 Jan 2004 23:38:17 +0000

Thanks for giving it a try. Glad it wasn’t too hosed… I guess there is our answer about mmap. It’s hungry for filesystems!

I’ve posted a msg to uml-user, so we’ll see what comes of it. I also removed the option from the config edit page…

Thanks,
-Chris

By: dmuench

dmuench — Sun, 11 Jan 2004 22:59:33 +0000

My var filesystem was pretty goofed up, but I managed to fix it, and am up and running again without mmap.

By: caker

caker — Sun, 11 Jan 2004 22:53:59 +0000

Well then. Let me gather the info and send that along to the list.

-Chris

By: dmuench

dmuench — Sun, 11 Jan 2004 22:51:23 +0000

That went badly.

From dmesg:

EXT3-fs error (device ubd(98,32)) in ext3_reserve_inode_write: IO failure
EXT3-fs error (device ubd(98,32)) in ext3_orphan_add: IO failure
attempt to access beyond end of device
62:20: rw=0, want=1086378492, limit=525312
EXT3-fs error (device ubd(98,32)): ext3_get_inode_loc: unable to read inode block – inode=2507, block=808465534
EXT3-fs error (device ubd(98,32)) in ext3_reserve_inode_write: IO failure
attempt to access beyond end of device
62:20: rw=0, want=1086378492, limit=525312
EXT3-fs error (device ubd(98,32)): ext3_get_inode_loc: unable to read inode block – inode=2507, block=808465534
EXT3-fs error (device ubd(98,32)) in ext3_reserve_inode_write: IO failure
attempt to access beyond end of device
62:20: rw=0, want=1086378492, limit=525312
EXT3-fs error (device ubd(98,32)): ext3_get_inode_loc: unable to read inode block – inode=2507, block=808465534
EXT3-fs error (device ubd(98,32)) in ext3_reserve_inode_write: IO failure

Over and over and over, and I/O failures on files. I’m turning it back off..

By: dmuench

dmuench — Sun, 11 Jan 2004 22:17:55 +0000

I’m game.

I just rebooted my linode with it enabled. I do nightly backups, so I am not overly concerned. Here’s hoping for the best..