linux-kernel - Re: ext4 corruption on alpha with 4.20.0-09062-gd8372ba8ce28

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Date:   Fri, 15 Feb 2019 18:59:48 +0200
From:   Meelis Roos <mroos@...ux.ee>
To:     linux-alpha@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-block@...r.kernel.org, Jan Kara <jack@...e.cz>
Subject: Re: ext4 corruption on alpha with 4.20.0-09062-gd8372ba8ce28

>> I have noticed ext4 filesystem corruption on two of my test alphas with 4.20.0-09062-gd8372ba8ce28.
> 
> Retried it, still happens with 5.0.0-rc5-00358-gdf3865f8f568 - rsync of emerge --sync just fail with nothing in dmesg.

Finished second round of bisecting, first round did not get me far enough so
I may still have false "goods" in my bisection history.

The command I used for bisecting was Gentoos
emerge --sync.
that sometimes failed from error -6 or -11 from rsync.
Usually the file system corruption did not happen and nothing was in dmesg, just file IO error from rsync.

The result of the bisection is
[88dbcbb3a4847f5e6dfeae952d3105497700c128] blkdev: avoid migration stalls for blkdev pages

Is that result relevant for the problem or should I continue bisecting between 4.20.0 and the so far first bad commit?

>> On AlphaServer DS10:
>> [10749.664418] EXT4-fs error (device sda2): __ext4_iget:5052: inode #1853093: block 1: comm rsync: invalid block
>>
>> On AlphaServer DS10L:
>> [ 5325.064656] EXT4-fs error (device sda2): htree_dirblock_to_tree:1007: inode #1191951: block 4731728: comm rm: bad entry in directory: directory entry overrun - offset=76, inode=417080, rec_len=61816, name_len=35, size=4096
>> [ 5325.069539] EXT4-fs error (device sda2): htree_dirblock_to_tree:1007: inode #1191951: block 4731728: comm rm: bad entry in directory: directory entry overrun - offset=76, inode=417080, rec_len=61816, name_len=35, size=4096
>> [ 5325.077351] EXT4-fs error (device sda2): ext4_empty_dir:2718: inode #1191951: block 4731728: comm rm: bad entry in directory: directory entry overrun - offset=76, inode=417080, rec_len=61816, name_len=35, size=4096
>>
>> Two other alphas, PC-164 and Eiger, worked fine with the same kernel version (different kernel configs according to hardware).
>>
>> The details:
>> 4.20 worked fine, with gentoo emerge package update after bootup.
>> Next, 4.20.0-06428-g00c569b567c7 worked fine, with gentoo emerge after bootup.
>> Next, 4.20.0-09062-gd8372ba8ce28 booted up fine but rsync and rm during start of gentoo emerge errored out like above.
>>
>> So the corruption _might_ have happened during bootup of previous kernel but it looks more likely that only the latest kernel with blk-mq introduced the problems. mq-deadline is in use on all the alphas.
>>
>> DS10 has Symbios 53C896 SCSI (sym2 driver), DS10L has QLogic ISP1040, so they are different. Working Eiger and PC164 have sym2 based scsi controllers too.
> 

-- 
Meelis Roos <mroos@...ux.ee>