Sergey,

seems it is not an OS-specific issue.

strace reports that glibc is looking for /etc/localtime, but the file does not exist:

strace ./src/luajit -e "print(os.time(os.date('*t', -1)))"

futex(0x70d8ab961070, FUTEX_WAKE_PRIVATE, 2147483647) = 0
rt_sigaction(SIGINT, {sa_handler=0x4057e5, sa_mask=[INT], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x70d8ab79bfd0}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
openat(AT_FDCWD, "/etc/localtime", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/localtime", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
newfstatat(1, "", {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0), ...}, AT_EMPTY_PATH) = 0
write(1, "nil\n", 4nil
) = 4
rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[INT], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x70d8ab79bfd0}, {sa_handler=0x4057e5, sa_mask=[INT], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x70d8ab79bfd0}, 8) = 0
munmap(0x414e2000, 131072) = 0
exit_group(0) = ?
+++ exited with 0 +++

The same issue can be reproduced on other Linux distros after removing /etc/localtime.

On redOS the issue can be fixed by creating a symlink:

ln -sf /usr/share/zoneinfo/Europe/Moscow /etc/localtime

ctest -V -R lj-1470-os-time-epoch-minus-1s.test.lua

The following tests passed:
test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua

100% tests passed, 0 tests failed out of 1

Label Time Summary:
tarantool-tests = 0.00 sec*proc (1 test)

Total Test time (real) = 0.01 sec

I propose checking a file /etc/localtime instead checking an OS name, this will be a more correct fix.

However, LGTM, I will not insist.

Sergey

On 7/2/26 19:02, Sergey Bronnikov wrote:

Sergey,

thanks for the patch! See my comments.

Sergey

On 7/2/26 17:28, Sergey Kaplun wrote:

RED OS for some reason sets `errno` to 2 ENOENT ("No such file or
directory") after the call to `mktime()`. So just skip the test for it.
---

Branch: https://github.com/tarantool/luajit/tree/skaplun/fix-os-time-test-redos
Failed workflow: https://github.com/tarantool/tarantool/actions/runs/28585213455/job/84775371860?pr=12886#step:5:20692

Side note: The errno is set for __any__ call to the `mktime()`.

Tested inside the following Docker:

===================================================================
FROM registry.red-soft.ru/ubi8/ubi-minimal:latest

RUN dnf update -y && \
    dnf install -y cmake vim make git curl gcc g++ gdb man && \
    dnf clean all
===================================================================

| docker build . --tag redos
| docker run --network=host -ti redos bash

Then clone LuaJIT and proceed as usual.

With the patch the test skipped:
| 1..0 # SKIP RedOS incrorrect behaviour for mktime

 .../lj-1470-os-time-epoch-minus-1s.test.lua    | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua b/test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua
index dfe1ee11..ebfe6f22 100644
--- a/test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua
+++ b/test/tarantool-tests/lj-1470-os-time-epoch-minus-1s.test.lua
@@ -1,9 +1,25 @@
 local tap = require('tap')
 
+local function detect_redos()
+  local read_file = require('utils').tools.read_file
+  local hasfile, data = pcall(read_file, '/etc/os-release')
+  if not hasfile then
+    -- Not Linux probably, so not the Red OS.
+    return false
+  else
+    return data:match('RED OS')
+  end
+end

Why do you think the problem is in RedOS, not in Glibc?

I propose skipping test for some Glibc version using CMake macro

introduced in the following commit:

commit af0f59da76292f30ff75be1ab01458d47b226995
Author: Sergey Kaplun <skaplun@tarantool.org>
Date: Wed Dec 4 15:03:56 2024 +0300

test: fix LuaJIT-tests for old libc version

Otherwise, we will skip this test for always for RedOS.

in RedOS 8 glibc version is 2.36-14:

[root@pony /]# rpm -qa | grep glibc
glibc-common-2.36-14.red80.x86_64
glibc-gconv-extra-2.36-14.red80.x86_64
glibc-langpack-en-2.36-14.red80.x86_64
glibc-langpack-ru-2.36-14.red80.x86_64
glibc-2.36-14.red80.x86_64
glibc-devel-2.36-14.red80.x86_64

Also, why detect_redos() is not in utils.lua?

+
 -- The test file demonstrates os.time() fail to return -1 time
 -- value.
 -- See also: https://github.com/LuaJIT/LuaJIT/issues/1470.
-local test = tap.test('lj-1470-os-time-epoch-minus-1s')
+local test = tap.test('lj-1470-os-time-epoch-minus-1s'):skipcond({
+  -- XXX: RED OS for some reason sets `errno` to 2 ENOENT ("No
+  -- such file or directory") after the call to `mktime()`. So
+  -- just skip the test for it.
+  ['RED OS incrorrect behaviour for mktime'] = detect_redos(),
+})
 
 test:plan(1)