At 05/05/2017 01:29 AM, Kai Krakow wrote:
Hello!
Since I saw a few kernel freezes lately (due to experimenting with
ck-sources) including some filesystem-related backtraces, I booted my
rescue system to check my btrfs filesystem.
Luckily, it showed no problems. It said, everything's fine. But I also
thought: Okay, let's try lowmem mode. And that showed a frightening
long list of extent corruptions und unreferenced chunks. Should I worry?
Thanks for trying lowmem mode.
Would you please provide the version of btrfs-progs?
IIRC "ERROR: data extent[96316809216 2097152] backref lost" bug has been
fixed in recent release.
And for reference, would you please provide the tree dump of your chunk
and device tree?
This can be done by running:
# btrfs-debug-tree -t device <device>
# btrfs-debug-tree -t chunk <device>
And this 2 dump only contains the btrfs chunk mapping info, so nothing
sensitive is contained.
Thanks,
Qu
PS: The freezes seem to be related to bfq, switching to deadline solved
these.
Full log attached, here's an excerpt:
---8<---
checking extents
ERROR: chunk[256 4324327424) stripe 0 did not find the related dev extent
ERROR: chunk[256 4324327424) stripe 1 did not find the related dev extent
ERROR: chunk[256 4324327424) stripe 2 did not find the related dev extent
ERROR: chunk[256 7545552896) stripe 0 did not find the related dev extent
ERROR: chunk[256 7545552896) stripe 1 did not find the related dev extent
ERROR: chunk[256 7545552896) stripe 2 did not find the related dev extent
[...]
ERROR: device extent[1, 1094713344, 1073741824] did not find the related chunk
ERROR: device extent[1, 2168455168, 1073741824] did not find the related chunk
ERROR: device extent[1, 3242196992, 1073741824] did not find the related chunk
[...]
ERROR: device extent[2, 608854605824, 1073741824] did not find the related chunk
ERROR: device extent[2, 609928347648, 1073741824] did not find the related chunk
ERROR: device extent[2, 611002089472, 1073741824] did not find the related chunk
[...]
ERROR: device extent[3, 64433946624, 1073741824] did not find the related chunk
ERROR: device extent[3, 65507688448, 1073741824] did not find the related chunk
ERROR: device extent[3, 66581430272, 1073741824] did not find the related chunk
[...]
ERROR: data extent[96316809216 2097152] backref lost
ERROR: data extent[96316809216 2097152] backref lost
ERROR: data extent[96316809216 2097152] backref lost
ERROR: data extent[686074396672 13737984] backref lost
ERROR: data extent[686074396672 13737984] backref lost
ERROR: data extent[686074396672 13737984] backref lost
[...]
ERROR: errors found in extent allocation tree or chunk allocation
checking free space cache
checking fs roots
ERROR: errors found in fs roots
Checking filesystem on /dev/disk/by-label/system
UUID: bc201ce5-8f2b-4263-995a-6641e89d4c88
found 1960075935744 bytes used, error(s) found
total csum bytes: 1673537040
total tree bytes: 4899094528
total fs tree bytes: 2793914368
total extent tree bytes: 190398464
btree space waste bytes: 871743708
file data blocks allocated: 6907169177600
referenced 1979268648960
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