[Tarantool-patches] [PATCH luajit v2 1/2] Print errors from __gc finalizers instead of rethrowing them.

[Sergey Bronnikov]

Hi, Max


Thanks for the patch! LGTM

See my comments below.

Sergey

On 11/8/23 00:06, Maksim Kokryashkin wrote:


<snipped>

> diff --git a/test/tarantool-tests/lj-946-print-errors-from-gc-fin-custom.test.lua b/test/tarantool-tests/lj-946-print-errors-from-gc-fin-custom.test.lua
> new file mode 100644
> index 00000000..71efc260
> --- /dev/null
> +++ b/test/tarantool-tests/lj-946-print-errors-from-gc-fin-custom.test.lua
> @@ -0,0 +1,42 @@
> +local tap = require('tap')
> +local test = tap.test('lj-946-print-errors-from-gc-fin-custom'):skipcond({
> +  ['Test requires JIT enabled'] = not jit.status(),
> +})
> +
> +test:plan(2)
> +
> +local ffi = require('ffi')
> +local error_in_finalizer = false
> +
> +local function errfin_handler()
> +    error_in_finalizer = true
> +end
> +
> +local function new_bad_cdata()
> +  return ffi.gc(ffi.new('char [?]', 1024), 'uncallable string')
> +end
> +
> +local function test_f()
> +  collectgarbage('collect')
> +  -- Make GC aggressive enough to end the atomic phase before
> +  -- exiting the trace.
> +  collectgarbage('setstepmul', 400)
> +  -- The number of iterations is empirical, just big enough for the
> +  -- issue to strike.
> +  for _ = 1, 4000 do

Works fine with a number of iterations equal to 300,

checked locally by running test 1000 times.

> +    new_bad_cdata()
> +  end
> +end
> +
> +jit.opt.start('hotloop=1')
> +-- Handler is registered but never called before the patch.
> +-- It should be called after the patch.
> +jit.attach(errfin_handler, 'errfin')
> +local status = pcall(test_f)
> +-- We have to stop GC now because any step raises the error due to
> +-- cursed cdata objects.
> +collectgarbage('stop')
> +test:ok(status, 'test function completed successfully')
> +test:ok(error_in_finalizer, 'error handler called')
> +
> +test:done(true)
> diff --git a/test/tarantool-tests/lj-946-print-errors-from-gc-fin-default.test.lua b/test/tarantool-tests/lj-946-print-errors-from-gc-fin-default.test.lua
> new file mode 100644
> index 00000000..dfef11e5
> --- /dev/null
> +++ b/test/tarantool-tests/lj-946-print-errors-from-gc-fin-default.test.lua
> @@ -0,0 +1,11 @@
> +local tap = require('tap')
> +local test = tap.test('lj-flush-on-trace'):skipcond({
> +  ['Test requires JIT enabled'] = not jit.status(),
> +})
> +
> +test:plan(1)
> +
> +local script = require('utils').exec.makecmd(arg, { redirect = '2>&1' })
> +local output = script()
> +test:like(output, '.*ERROR in finalizer:.*')

testcase description is missed:


TAP version 13
1..1
ok - nil

> +test:done(true)
> diff --git a/test/tarantool-tests/lj-946-print-errors-from-gc-fin-default/script.lua b/test/tarantool-tests/lj-946-print-errors-from-gc-fin-default/script.lua
> new file mode 100644
> index 00000000..fdd9ced1
> --- /dev/null
> +++ b/test/tarantool-tests/lj-946-print-errors-from-gc-fin-default/script.lua
> @@ -0,0 +1,24 @@
> +local ffi = require('ffi')
> +
> +local function new_bad_cdata()
> +  return ffi.gc(ffi.new('char [?]', 1024), 'uncallable string')
> +end
> +
> +local function test_f()
> +  collectgarbage('collect')
> +  -- Make GC aggressive enough to end the atomic phase before
> +  -- exiting the trace.
> +  collectgarbage('setstepmul', 400)
> +  -- The number of iterations is empirical, just big enough for the
> +  -- issue to strike.
> +  for _ = 1, 4000 do
> +    new_bad_cdata()
> +  end
> +end
> +
> +jit.opt.start('hotloop=1')
> +local status = pcall(test_f)
> +-- We have to stop GC now because any step raises the error due to
> +-- cursed cdata objects.
> +collectgarbage('stop')
> +assert(status, 'error is not rethrown')
> --
> 2.39.3 (Apple Git-145)
>
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