Merge branch '1.6' of git+ssh://github.com/tarantool/tarantool into 1.6

test/box/errinj.result

 errinj = box.error.injection
 ---
 ...
+net_box = require('net.box')
+---
+...
 space = box.schema.space.create('tweedledum')
 ---
 ...
@@ -397,9 +400,45 @@ errinj.set("ERRINJ_TUPLE_ALLOC", false)
 ---
 - ok
 ...
+-- gh-881 iproto request with wal IO error
+box.schema.user.grant('guest', 'read,write,execute', 'universe')
+---
+...
+test = box.schema.create_space('test')
+---
+...
+_ = test:create_index('primary')
+---
+...
+for i=1, box.cfg.rows_per_wal do test:insert{i, 'test'} end
+---
+...
+c = net_box:new(box.cfg.listen)
+---
+...
+-- try to write xlog without permission to write to disk
+errinj.set('ERRINJ_WAL_WRITE', true)
+---
+- ok
+...
+c.space.test:insert({box.cfg.rows_per_wal + 1,1,2,3})
+---
+- error: Failed to write to disk
+...
+errinj.set('ERRINJ_WAL_WRITE', false)
+---
+- ok
+...
+-- Cleanup
 s:drop()
 ---
 ...
+test:drop()
+---
+...
 errinj = nil
 ---
 ...
+box.schema.user.revoke('guest', 'read,write,execute', 'universe')
+---
+...

test/box/errinj.test.lua

 errinj = box.error.injection
+net_box = require('net.box')
 
 space = box.schema.space.create('tweedledum')
 index = space:create_index('primary', { type = 'hash' })
@@ -128,7 +129,21 @@ s:select{};
 --# setopt delimiter ''
 errinj.set("ERRINJ_TUPLE_ALLOC", false)
 
-s:drop()
+-- gh-881 iproto request with wal IO error
+box.schema.user.grant('guest', 'read,write,execute', 'universe')
+test = box.schema.create_space('test')
+_ = test:create_index('primary')
+
+for i=1, box.cfg.rows_per_wal do test:insert{i, 'test'} end
+c = net_box:new(box.cfg.listen)
 
+-- try to write xlog without permission to write to disk
+errinj.set('ERRINJ_WAL_WRITE', true)
+c.space.test:insert({box.cfg.rows_per_wal + 1,1,2,3})
+errinj.set('ERRINJ_WAL_WRITE', false)
 
+-- Cleanup
+s:drop()
+test:drop()
 errinj = nil
+box.schema.user.revoke('guest', 'read,write,execute', 'universe')