Re: Reiser4 Oops

[Edward Shishkin <edward.shishkin@gmail.com>]

Андрей Колченко wrote:
> Wanted to try reiser4. I have compiled a kernel with reiser4, format
> the partition and began to copy the folder /home.
> After a short time the screen goes black and there was one console
> with the error output. After switching to other tty and back up
> continued. dmesg output copied to the pastebin
> (http://pastebin.com/XyDKWJ8J).
> This was repeated several times and the computer hangs perfectly still.
> I have ubuntu 10.10 on a laptop Acer Aspire 7720z. 

Yup, I see the bug:
instead of writing pages reiser4 kicks ext4 to do it,
and, I guess, doesn't clear journal_info (this is why
ext4 oopses).

[  278.062271]  [<c0318822>] ? jbd2_journal_start+0x12/0x20
[  278.062322]  [<c02f5858>] ? ext4_journal_start_sb+0xc8/0x100
[  278.062377]  [<c02e0957>] ? ext4_meta_trans_blocks+0x67/0xc0
[  278.062431]  [<c02e47e3>] ? ext4_da_writepages+0x203/0x560
[  278.062484]  [<c060fccd>] ? _raw_spin_lock+0xd/0x10
[  278.062530]  [<c0281ca2>] ? flush_some_atom+0x312/0x540
[  278.062578]  [<c02a4cdd>] ? writepages_cryptcompress+0x19d/0x220
[  278.062636]  [<c02913a8>] ? reiser4_writeout+0xa8/0x1a0
[  278.062684]  [<c022c186>] ? iput+0x36/0x270
[  278.062724]  [<c02367e4>] ? generic_writeback_sb_inodes+0xe4/0x150
[  278.062782]  [<c01dfaac>] ? do_writepages+0x1c/0x40
[  278.062826]  [<c0236125>] ? writeback_single_inode+0x85/0x250
[  278.062877]  [<c060fccd>] ? _raw_spin_lock+0xd/0x10
[  278.062921]  [<c028db64>] ? reiser4_writeback_inodes+0xa4/0x130
[  278.062974]  [<c02367b1>] ? generic_writeback_sb_inodes+0xb1/0x150
[  278.063031]  [<c0236c6b>] ? writeback_inodes_wb+0x10b/0x150


here should be writeback_sb_inodes() instead of writeback_inodes_wb


[  278.063082]  [<c0291d06>] ? entd_flush+0xa6/0xe0
[  278.063127]  [<c0291d40>] ? entd+0x0/0x240
[  278.063166]  [<c0291e51>] ? entd+0x111/0x240
[  278.063208]  [<c0165fd0>] ? autoremove_wake_function+0x0/0x50
[  278.064008]  [<c0291d40>] ? entd+0x0/0x240
[  278.067417]  [<c0165ba4>] ? kthread+0x74/0x80
[  278.067417]  [<c0165b30>] ? kthread+0x0/0x80
[  278.067417]  [<c010357e>] ? kernel_thread_helper+0x6/0x10


It is interesting that the path
entd -> writeback_inodes_wb -> ext4_da_writepages
has never been triggered on my testing machine (I also
have reiser4 and ext4 there). Perhaps, this is because
of different system configurations.

I'll try to fix it in the near future, so that you'll be able to
try reiser4.

Thanks for your report,
Edward.
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