Bug 196903
| Summary: | btrfs send fails with ioctl error 524 | ||
|---|---|---|---|
| Product: | File System | Reporter: | Alessandro Polverini (alex) |
| Component: | btrfs | Assignee: | Josef Bacik (josef) |
| Status: | RESOLVED CODE_FIX | ||
| Severity: | high | CC: | dsterba |
| Priority: | P1 | ||
| Hardware: | Intel | ||
| OS: | Linux | ||
| Kernel Version: | 4.12.0-0.bpo.1-amd64 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
I forgot to add that the problem is in the "send" side, because it arises even if I send a snapshot to a file. # uname -a
Linux delta.lkj.it 4.12.0-0.bpo.1-amd64 #1 SMP Debian 4.12.6-1~bpo9+1 (2017-08-27) x86_64 GNU/Linux
# btrfs --version
btrfs-progs v4.12
# btrfs fi show
Label: 'data' uuid: 8fa895ff-f225-4854-8025-569f570cb5b8
Total devices 1 FS bytes used 578.25GiB
devid 1 size 1.12TiB used 1.04TiB path /dev/sda3
# btrfs fi df /mnt/data/
Data, single: total=1.01TiB, used=566.61GiB
System, DUP: total=8.00MiB, used=128.00KiB
Metadata, DUP: total=13.50GiB, used=11.64GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
I've compiled btrfs progs 4.13 from sources and I get the same error. Errno 524 is ENOTSUPP, although that should be EOPNOTSUPP. This error appears when an unsupported type of inode is found, there should be a message in the log "unexpected inode type %o", please look it up and post back the number you see there. I'll send a fix for the error code and update the error message. Looking to the code, I'm suspecting that's the type is of a block device, so the expected value is 060000. I've since then found the problem: a zero-byte file with permissions ?--------- that I had to remove by myself. After having removed it I can now create and send snapshots again. I can confirm that in the log there was this warning:
> BTRFS warning (device sda3): unexpected inode type 0
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I've a filesystem with daily snapshots that I send remotely using send/receive. After an unexpected reboot of the server, even if a complete fsck and scrub are perfectly ok, I'm unable to send new snapshots because btrfs send stops with this error: > ERROR: send ioctl failed with -524: Unknown error 524 the problem arise both sending a complete snapshot or using -p. I'm using btrfs progs version 4.12.