Hello

I got a very weird problem yesterday , suddenly my raid10 with 6 Disks went read only with this error :

Jul 24 23:07:09 ramiroserver dnsmasq[10431]: using nameserver 8.8.8.8#53
Jul 24 23:07:09 ramiroserver dnsmasq[10431]: using nameserver 2003:dc:2f25:200:6ef0:49ff:fe45:27eb#53
Jul 24 23:07:09 ramiroserver dnsmasq[10431]: using nameserver 2003:dc:2f12:fb01:a236:9fff:febe:59dc#53
Jul 24 23:12:45 ramiroserver kernel: BTRFS critical (device sdh1): corrupt leaf: block=28466229657600 slot=142 extent bytenr=22370527346688 len=131072 invalid extent refs, have 1 expect >= inline 4222615553
Jul 24 23:12:45 ramiroserver kernel: BTRFS info (device sdh1): leaf 28466229657600 gen 610063 total ptrs 208 free space 59 owner 2
Jul 24 23:12:45 ramiroserver kernel: #011item 0 key (22370491891712 168 65536) itemoff 16230 itemsize 53
Jul 24 23:12:45 ramiroserver kernel: #011#011extent refs 1 gen 365653 flags 1
Jul 24 23:12:45 ramiroserver kernel: #011#011extent refs 1 gen 552994 flags 1
Jul 24 23:12:45 ramiroserver kernel: #011#011ref#0: extent data backref root 5 objectid 9942256 offset 409495535616 count 1
Jul 24 23:12:45 ramiroserver kernel: #011item 207 key (22370586890240 168 282624) itemoff 5259 itemsize 53
Jul 24 23:12:45 ramiroserver kernel: #011#011extent refs 1 gen 554551 flags 1
Jul 24 23:12:45 ramiroserver kernel: #011#011ref#0: extent data backref root 5 objectid 9942256 offset 552465006592 count 1
Jul 24 23:12:45 ramiroserver kernel: BTRFS error (device sdh1): block=28466229657600 write time tree block corruption detected
Jul 24 23:12:45 ramiroserver kernel: BTRFS: error (device sdh1) in btrfs_commit_transaction:2460: errno=-5 IO failure (Error while writing out transaction)
Jul 24 23:12:45 ramiroserver kernel: BTRFS info (device sdh1: state E): forced readonly
Jul 24 23:12:45 ramiroserver kernel: BTRFS warning (device sdh1: state E): Skipping commit of aborted transaction.
Jul 24 23:12:45 ramiroserver kernel: BTRFS: error (device sdh1: state EA) in cleanup_transaction:1958: errno=-5 IO failure

I took the array offline and ran btrfs check without repair and it showed that everything is fine , so i restarted the server and now the array is fully working , i ran a scrub today with repair option that came back without any errors :

UUID:             2df74f3a-347d-4ae8-9f13-e760dc67014a
Scrub started:    Tue Jul 25 01:44:23 2023
Status:           finished
Duration:         11:32:36
Total to scrub:   15.90TiB
Rate:             401.11MiB/s
Error summary:    no errors found

 

I am running a dual 2011 system with ecc memory and had no error whatsoever before the btrfs error , the only problem is that due to the macvlan issue , i had 1 unclean reset a week before this , had the same thing 2 months ago thad corrupted my other raid1 array but that one did not came back after restart so i had to reformat it.

 

I am a litte worried now if this problem will come back and what is the real issue ?

Thank you

So i also ran a balance and it also had no errors , so i will i have to worry now that this can happen any time again ?

On 7/25/2023 at 1:33 PM, ramiro said:

write time tree block corruption detected

This usually means bad RAM or other kernel memory corruption, recommend running memtest.

Shouldn't there atleast be an ecc error then , or can there be undetected memory errors with ecc  ?

The array still runs fine , actually ran 2 scrubs already because of the monthly scrub.

 

If you are using ECC RAM that's likely not the problem, could be other hardware issue or a btrfs bug, which Unraid release are you running? There has been an unusual number of reports of this happening with v6.12.x, so possibly some kerne/btrfs bug.

I am running 6.12.3 , i am running 6.12 since the RC release, could it maybe be a communcation problem between the cpu's (as far as i saw the qpi link also has error correction so it also shouldn't be a problem).