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btrfs: stress send with deduplication and balance running in parallel

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Stress send running in parallel with balance and deduplication against
files that belong to the snapshots used by send. The goal is to verify
that these operations running in parallel do not lead to send crashing
(trigger assertion failures and BUG_ONs), or send finding an inconsistent
snapshot that leads to a failure (reported in dmesg/syslog). The test
needs big trees (snapshots) with large differences between the parent and
send snapshots in order to hit such issues with a good probability.

This currently fails on btrfs, hitting a BUG_ON() often, and with btrfs
error messages in dmesg/syslog. The problem has always existed and it is
not new, but probably unnoticed due to lack of test cases that exercise
these btrfs features running in parallel.

The following patches for btrfs fix the problems:

 "Btrfs: fix race between send and deduplication that lead to failures and
  crashes"

 "Btrfs: prevent send failures and crashes due to concurrent relocation"

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This commit is contained in:
Filipe Manana
2019-04-22 16:44:16 +01:00
committed by Eryu Guan
parent 872050db3c
commit 8afebc0223
3 changed files with 230 additions and 0 deletions
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tests/btrfs/group
+1
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@@ -189,3 +189,4 @@
184 auto quick volume
185 volume
186 auto quick send volume
187 auto send dedupe clone balance