Re: Mount failure with 5.2.7 but mounts with 5.1.4

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

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On 2019/8/10 下午11:54, Peter Chant wrote:
> I attempted update an i5 machine today with kernel 5.2.7.  Unfortunately
> I could not mount the file system.  However, reverting the kernel back
> to 5.1.4 allowed it to mount with no issue.
> 
> This issue is not critical to me, machine boots with older kernel, I
> have a backup and the machine is only lightly used anyway.  However, I
> wonder whether this info is useful to anyone?
> 
> I have a spare ext4 root partition on the hard drive of the affected
> machine, so I booted to that, with 5.2.7, and got the following behaviour.
> 
> dmesg:
> 
> [   55.139154] BTRFS: device fsid 5128caf4-b518-4b65-ae46-b5505281e500
> devid 1 transid 66785 /dev/sda4
> [   55.139623] BTRFS info (device sda4): disk space caching is enabled
> [   55.813959] BTRFS critical (device sda4): corrupt leaf: root=5
> block=38884884480 slot=1 ino=45745394, invalid inode generation: has
> 18446744073709551492 expect [0, 66786]

Please provide the following output:

# btrfs ins dump-tree -b 38884884480 /dev/sda4

I'm not sure if it's an really invalid case or a false alert I haven't
found.

For the workaround, just like Nikolay mentioned, reverted to older
kernel and remove the inode by:

# find <mnt> -inum 45745394 -exec rm {} \;

Thanks,
Qu

> [   55.817296] BTRFS error (device sda4): block=38884884480 read time
> tree block corruption detected
> [   55.817342] BTRFS warning (device sda4): failed to read fs tree: -5
> [   55.834802] BTRFS error (device sda4): open_ctree failed
> 
> /var/log/messages:
> Aug 10 11:59:05 retreat dbus[903]: [system] Activating service
> name='org.freedesktop.PolicyKit1' (using servicehelper)
> Aug 10 11:59:05 retreat polkitd[975]: started daemon version 0.105 using
> authority implementation `local' version `0.105'
> Aug 10 11:59:05 retreat dbus[903]: [system] Successfully activated
> service 'org.freedesktop.PolicyKit1'
> Aug 10 11:59:31 retreat kernel: [   55.139154] BTRFS: device fsid
> 5128caf4-b518-4b65-ae46-b5505281e500 devid 1 transid 66785 /dev/sda4
> Aug 10 11:59:31 retreat kernel: [   55.139623] BTRFS info (device sda4):
> disk space caching is enabled
> 
> uname -a:
> Linux retreat 5.2.7 #1 SMP Wed Aug 7 23:53:42 BST 2019 x86_64 Intel(R)
> Core(TM) i5-4430 CPU @ 3.00GHz GenuineIntel GNU/Linux
> 
> Rebooting with 5.1.4 showed no problems.
> 
> 
> A very similar kernel, with AMD rather than Intel processor options, is
> running on the Ryzen machine I am typing this on.  I did have my hdd
> file system seem to hang, but not sure if that is related.
> 
> I have not tried the intel kernel on my laptop, but the laptop is a lot
> older, as it is a core2duo.
> 
> Seems a bit odd to me that 5.2.7 should show such an issue but 5.1.4 be
> OK with it.
> 
> Pete
> 


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