Hi, Sergey,

thanks for the patch! LGTM with a minor comment below.

Sergey

<snipped>

diff --git a/test/tarantool-tests/lj-1298-oom-on-concat-recording.test.lua b/test/tarantool-tests/lj-1298-oom-on-concat-recording.test.lua
new file mode 100644
index 00000000..961df798
--- /dev/null
+++ b/test/tarantool-tests/lj-1298-oom-on-concat-recording.test.lua
@@ -0,0 +1,53 @@
+local tap = require('tap')
+
+-- Test file to demonstrate unbalanced Lua stack after instruction
+-- recording due to throwing an OOM error at the moment of
+-- recording without restoring the Lua stack back.
+-- See also: https://github.com/LuaJIT/LuaJIT/issues/1298.
+
+local test = tap.test('lj-1298-oom-on-concat-recording'):skipcond({
+  ['Test requires JIT enabled'] = not jit.status(),
+})
+
+local allocinject = require('allocinject')
+
+test:plan(2)
+
+jit.opt.start('hotloop=1')
+
+-- Allocation limit to return `NULL`.
+local ALLOC_LIMIT = 2048
+
+local bigstr = string.rep('x', ALLOC_LIMIT)
+local __concat = function()
+  return 'concated'

<snipped>