# Panic: leveldb/table: corruption on data-block
**URL:** https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526
**Category:** Support
**Created:** [April 24, 2015, 10:09am UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526 "2015-04-24T10:09:21Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@Tom](https://forum.syncthing.net/u/Tom)
#### Post date: [April 24, 2015, 10:09am UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/1 "2015-04-24T10:09:21Z")
can’t start ST + SyncTrayzor, i keep getting the above panic. Partial log : [http://pastebin.com/424ykBpL](http://pastebin.com/424ykBpL)
help?
thx, Tom.
---
### Author:  [@AudriusButkevicius](https://forum.syncthing.net/u/AudriusButkevicius)
#### Post date: [April 24, 2015, 10:20am UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/2 "2015-04-24T10:20:19Z")
Remove the index directory from syncthings home directory and let it reindex.
---
### Author:  [@Tom](https://forum.syncthing.net/u/Tom)
#### Post date: [April 24, 2015, 10:26am UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/3 "2015-04-24T10:26:15Z")
would removing the corrupt file do the trick? I’m asking bc I just moved to .11 and a full reindex will take days, if not a week.
---
### Author:  [@AudriusButkevicius](https://forum.syncthing.net/u/AudriusButkevicius)
#### Post date: [April 24, 2015, 10:32am UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/4 "2015-04-24T10:32:28Z")
I don’t think you can do that.
---
### Author:  [@Tom](https://forum.syncthing.net/u/Tom)
#### Post date: [April 24, 2015, 11:46am UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/5 "2015-04-24T11:46:31Z")
for the sake of science, i tried it anyway. Everything looks normal. Here’s an excerpt from syncthing.log after removing the bad .ldb :
```
SyncThingProcessRunner.Start called
Starting syncthing: C:\Users\Tom\AppData\Roaming\SyncTrayzor\syncthing.exe
[XC2UK] 2015/04/24 12:11:45.907696 main.go:399: INFO: syncthing v0.11.0 (go1.4.2 windows-amd64 default) unknown-user@syncthing-builder 2015-04-22 00:37:18 UTC
[XC2UK] 2015/04/24 12:11:45.908693 main.go:400: INFO: My ID: XC2UKT2
[XC2UK] 2015/04/24 12:12:33.533149 main.go:673: INFO: Starting web GUI on https://127.0.0.1:8384/
[XC2UK] 2015/04/24 12:12:35.125200 leveldb.go:1043: INFO: db repair: rewriting global version list for 6d6f7669657300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 412054686f7573616e6420576f72647320283230313229
[XC2UK] 2015/04/24 12:12:35.127203 leveldb.go:1043: INFO: db repair: rewriting global version list for 6d6f7669657300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 412054686f7573616e6420576f726473202832303132292f4e6f7720596f7520536565204d6520283230313329
[XC2UK] 2015/04/24 12:12:35.133206 leveldb.go:1043: INFO: db repair: rewriting global version list for 6d6f7669657300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 412054686f7573616e6420576f726473202832303132292f4e6f7720596f7520536565204d65202832303133292f4e6f7720596f7520536565204d652028323031332920373230702e52455249502e50524f5045522e424c555241592e73634f72702e7372742e2173796e63
[XC2UK] 2015/04/24 12:12:35.133206 leveldb.go:1043: INFO: db repair: rewriting global version list for 6d6f7669657300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 412054686f7573616e6420576f726473202832303132292f612e74686f7573616e642e776f7264732e323031322e31303830702e626c757261792e783236342e6474732d77696b692e524f2e737274
[XC2UK] 2015/04/24 12:12:35.137210 leveldb.go:1043: INFO: db repair: rewriting global version list for 6d6f7669657300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 412054686f7573616e6420576f726473202832303132292f612e74686f7573616e642e776f7264732e323031322e31303830702e626c757261792e783236342e6474732d77696b692e6d6b76
[XC2UK] 2015/04/24 12:13:07.251420 set.go:66: DEBUG: loaded localVersion for "movies": map[protocol.DeviceID]int64{7LQ62GR:20478, 7777777:21702}
[XC2UK] 2015/04/24 12:13:07.258424 set.go:75: DEBUG: movies Replace(7LQ62GR, [0])
[XC2UK] 2015/04/24 12:13:40.452349 set.go:66: DEBUG: loaded localVersion for "music": map[protocol.DeviceID]int64{7LQ62GR:18710, 7777777:21645}
[XC2UK] 2015/04/24 12:13:49.124078 set.go:169: DEBUG: movies WithGlobalTruncated()
[XC2UK] 2015/04/24 12:13:49.125077 set.go:75: DEBUG: music Replace(7LQ62GR, [0])
[XC2UK] 2015/04/24 12:13:49.172109 set.go:169: DEBUG: movies WithGlobalTruncated()
[XC2UK] 2015/04/24 12:13:49.193126 set.go:169: DEBUG: movies WithGlobalTruncated()
[XC2UK] 2015/04/24 12:14:17.525836 set.go:169: DEBUG: movies WithGlobalTruncated()
[XC2UK] 2015/04/24 12:14:17.548854 set.go:169: DEBUG: music WithGlobalTruncated()
[XC2UK] 2015/04/24 12:14:17.560860 set.go:155: DEBUG: movies WithHaveTruncated(7777777)
[XC2UK] 2015/04/24 12:14:17.561860 set.go:155: DEBUG: movies WithHaveTruncated(7777777)
[XC2UK] 2015/04/24 12:14:36.049071 set.go:141: DEBUG: movies WithNeedTruncated(7LQ62GR)
[XC2UK] 2015/04/24 12:14:37.355935 set.go:169: DEBUG: music WithGlobalTruncated()
[XC2UK] 2015/04/24 12:14:37.399963 set.go:141: DEBUG: movies WithNeedTruncated(7777777)
[XC2UK] 2015/04/24 12:14:37.413972 set.go:141: DEBUG: movies WithNeedTruncated(7777777)
[XC2UK] 2015/04/24 12:14:42.583387 set.go:169: DEBUG: music WithGlobalTruncated()
[XC2UK] 2015/04/24 12:14:42.623414 set.go:155: DEBUG: music WithHaveTruncated(7777777)
[XC2UK] 2015/04/24 12:14:49.307828 set.go:141: DEBUG: music WithNeedTruncated(7777777)
[XC2UK] 2015/04/24 12:14:50.934905 set.go:141: DEBUG: music WithNeedTruncated(7LQ62GR)
Killing Syncthing process
Syncthing process stopped with exit status Success
SyncThingProcessRunner.Start called
Starting syncthing: C:\Users\Tom\AppData\Roaming\SyncTrayzor\syncthing.exe
[XC2UK] 2015/04/24 12:26:21.880271 main.go:399: INFO: syncthing v0.11.0 (go1.4.2 windows-amd64 default) unknown-user@syncthing-builder 2015-04-22 00:37:18 UTC
[XC2UK] 2015/04/24 12:26:21.881270 main.go:400: INFO: My ID: XC2UKT2
[XC2UK] 2015/04/24 12:26:28.569690 main.go:673: INFO: Starting web GUI on https://127.0.0.1:8384/
[XC2UK] 2015/04/24 12:26:49.069231 set.go:66: DEBUG: loaded localVersion for "movies": map[protocol.DeviceID]int64{7777777:21702}
[XC2UK] 2015/04/24 12:26:49.075232 set.go:75: DEBUG: movies Replace(7LQ62GR, [0])
[XC2UK] 2015/04/24 12:27:19.989652 set.go:66: DEBUG: loaded localVersion for "music": map[protocol.DeviceID]int64{7LQ62GR:18710, 7777777:21645}
[XC2UK] 2015/04/24 12:27:20.127743 set.go:75: DEBUG: music Replace(7LQ62GR, [0])
[XC2UK] 2015/04/24 12:27:20.164773 set.go:169: DEBUG: movies WithGlobalTruncated()
[XC2UK] 2015/04/24 12:27:20.174778 set.go:169: DEBUG: movies WithGlobalTruncated()
[XC2UK] 2015/04/24 12:27:20.188787 set.go:169: DEBUG: movies WithGlobalTruncated()
[XC2UK] 2015/04/24 12:27:40.130954 set.go:155: DEBUG: movies WithHaveTruncated(7777777)
[XC2UK] 2015/04/24 12:27:40.130954 set.go:169: DEBUG: movies WithGlobalTruncated()
[XC2UK] 2015/04/24 12:27:40.163980 set.go:169: DEBUG: music WithGlobalTruncated()
```
---
### Author:  [@AudriusButkevicius](https://forum.syncthing.net/u/AudriusButkevicius)
#### Post date: [April 24, 2015, 12:29pm UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/6 "2015-04-24T12:29:41Z")
I guess that might purely be based on luck, or if the file was the last file in the index. I tried to delete a file from the middle of the sequence and it cried about not finding the file.
---
### Author:  [@Tom](https://forum.syncthing.net/u/Tom)
#### Post date: [April 24, 2015, 12:39pm UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/7 "2015-04-24T12:39:05Z")
most likely the last file in the index, since it had only just finished re-indexing after moving to 0.11
---
### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [April 24, 2015, 10:55pm UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/8 "2015-04-24T22:55:00Z")
Cool. If it starts, it’s all good. Syncthing tries to repair the database on startup, and will then rescan any files that are unknown or changed. 👍
---
### Author:  [@Tom](https://forum.syncthing.net/u/Tom)
#### Post date: [May 1, 2015, 2:25pm UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/9 "2015-05-01T14:25:02Z")
This is now a recurring issue ☹I have a particular folder which will always cause the panic ! Can we troubleshoot this please?
edit : just wanted to add that i did do a full re-index, still get the panic.
---
### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [May 1, 2015, 6:17pm UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/10 "2015-05-01T18:17:42Z")
Can you describe the steps that get you into this situation, from a clean setup, and post the resulting panic log?
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### Author:  [@Tom](https://forum.syncthing.net/u/Tom)
#### Post date: [May 1, 2015, 8:44pm UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/11 "2015-05-01T20:44:14Z")
Where can i find the panic logs ? I looked in %localappdata%\Syncthing , but nothing there…
I have 1 host that has successfully indexed the folder, I am sharing this folder to another host. The folder is pre-seeded on the 2nd host, meaning most (if not all) files are present. The 2nd host’s webif is asking me if I want to accept the share, which i confirm and this gets added to the config :
```
false
0
0
0
random
```
Indexing begins on the 2nd host, and eventually throws the panic.
---
### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [May 1, 2015, 8:52pm UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/12 "2015-05-01T20:52:41Z")
The panic log is wherever you see the panic. 👌
---
### Author:  [@Tom](https://forum.syncthing.net/u/Tom)
#### Post date: [May 2, 2015, 8:37am UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/13 "2015-05-02T08:37:31Z")
well, there’s a panic log in the 1st post of this thread.
Meanwhile I have wiped the index & config, and added only the 1 share. It is being indexed. Gonna take a while, it’s 3.4 Tb of data across approx 500 files. Waiting for the point where it’ll panic… ☕
---
### Author:  [@Tom](https://forum.syncthing.net/u/Tom)
#### Post date: [May 3, 2015, 7:53am UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/14 "2015-05-03T07:53:10Z")
it took the better part of 23 hours, but it panicked. 😵
panic log: [http://pastebin.com/t9TjXyWr](http://pastebin.com/t9TjXyWr)
Also, the resulting index files are numerous, as in \>2000 ldb files, which is similar to a bug i reported here : [\>2k .ldb files in %localappdata%/syncthing/index/ · Issue #1480 · syncthing/syncthing · GitHub](https://github.com/syncthing/syncthing/issues/1480)
---
### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [May 3, 2015, 7:56am UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/15 "2015-05-03T07:56:54Z")
Certainly looks like we’re running into some kind of database bug, perhaps related to the amount of data. I’ll whip something up to simulate an index for that amount data / files…
---
### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [May 3, 2015, 2:12pm UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/16 "2015-05-03T14:12:53Z")
For what it’s wort, I can’t reproduce this by writing indexes for 500 x 7 GB files, and changing / listing them from the database. The database also doesn’t grow beyond about 50 ldb files when doing this…
---
### Author:  [@Tom](https://forum.syncthing.net/u/Tom)
#### Post date: [May 3, 2015, 3:18pm UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/17 "2015-05-03T15:18:41Z")
can i send you the ldb files? Or is there some tool that i can use to see what’s going on in the ldb’s ?
---
### Author:  [@calmh](https://forum.syncthing.net/u/calmh)
#### Post date: [May 3, 2015, 3:46pm UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/18 "2015-05-03T15:46:02Z")
There’s a tool to list the indexes, but it kind of assumes that the database is not corrupt. This is a library we use, so I’m not really sure how to troubleshoot it without being able to reproduce… You could pack up the index directory and send a link to me in PM, perhaps something is extractable from it that may point to the root cause, or let me make a more accurate simulation of it so I can reproduce it myself perhaps…
---
### Author:  [@Tom](https://forum.syncthing.net/u/Tom)
#### Post date: [May 4, 2015, 8:06am UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/19 "2015-05-04T08:06:04Z")
PM sent
> = 20 chars.
---
### Author:  [@Tom](https://forum.syncthing.net/u/Tom)
#### Post date: [May 12, 2015, 8:32am UTC](https://forum.syncthing.net/t/panic-leveldb-table-corruption-on-data-block/2526/20 "2015-05-12T08:32:52Z")
guys… this keeps happening. Here’s the latest panic log : [http://pastebin.com/3dgDHhEL](http://pastebin.com/3dgDHhEL) Please help ?
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