Re: [PATCH v1 0/9] do not use s_dirt in ext4

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On Fri, 2012-03-30 at 17:35 +0200, Jan Kara wrote:
> > [23500.239442]  [<ffffffff811ab59d>] write_dirty_buffer+0x4d/0x80
> > [23500.239442]  [<ffffffff8123be1d>] __flush_batch+0x4d/0xa0
> > [23500.239442]  [<ffffffff8123c605>] jbd2_log_do_checkpoint+0xf5/0x4f0
> > [23500.239442]  [<ffffffff8123ca89>] __jbd2_log_wait_for_space+0x89/0x190
> > [23500.239442]  [<ffffffff81237a98>] start_this_handle+0x3a8/0x4e0
> > [23500.239442]  [<ffffffff810799e0>] ? remove_wait_queue+0x50/0x50
> > [23500.239442]  [<ffffffff81237c93>] jbd2__journal_start+0xc3/0x100
> > [23500.239442]  [<ffffffff81237ce3>] jbd2_journal_start+0x13/0x20
> > [23500.239442]  [<ffffffff8121743f>] ext4_journal_start_sb+0x7f/0x1d0
> > [23500.239442]  [<ffffffff81224a24>] ? ext4_fallocate+0x1a4/0x530
> > [23500.239442]  [<ffffffff811f64c5>] ? ext4_meta_trans_blocks+0xa5/0xb0
> > [23500.239442]  [<ffffffff81224a24>] ext4_fallocate+0x1a4/0x530
> > [23500.239442]  [<ffffffff8117a092>] do_fallocate+0xf2/0x160
> > [23500.239442]  [<ffffffff8117a14b>] sys_fallocate+0x4b/0x70
> > [23500.239442]  [<ffffffff815e6d69>] system_call_fastpath+0x16/0x1b
> > [23500.239442] Code: ee 44 89 e7 e8 35 1f 0f 00 49 8b 5d 18 4c 89 ef e8 19 4e 00 00 48 83 c4 08 c1 e3 18 c1 fb 1f 83 e3 a1 89 d8 5b 41 5c 41 5d 5d c3 <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b 66 0f 1f 84 00 00 00 00 00 55 48 
> > [23500.239442] RIP  [<ffffffff811a9add>] submit_bh+0x10d/0x120
> > [23500.239442]  RSP <ffff880273a41b58>
> > [23500.261657] ---[ end trace 3db7a7a7ae953551 ]---
>   Hmm, looks like we tried to checkpoint BH_Unwritten buffer. That looks
> like a bug in fallocate() support. Not really related but definitely worth
> reporting.

Well, I ran vanilla the tests in vanilla 3.3 overnight, they were fine.
But may be I was lucky. I'll try to run the tests with vanilla kernel
some more. I mean, it would make more sense to report something against
vanilla 3.3, not a patched 3.3.

Any hints how to properly report an ext4 bug?

-- 
Best Regards,
Artem Bityutskiy

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