https://gcc.gnu.org/g:be98b8c25915aa20e9eb2b25786838b12127ada0

commit r16-7738-gbe98b8c25915aa20e9eb2b25786838b12127ada0
Author: Jerry DeLisle <[email protected]>
Date:   Sun Feb 15 15:17:17 2026 -0800

    Fortran: Add new testcase for PR121360
    
    This test case is from the PR adjusted to reduce the execution
    time and includes a suitable test condition. It was tested with
    export GFORTRAN_NUM_IMAGES=200 which of course takes a bit of
    time.
    
            PR fortran/121360
    
    gcc/testsuite/ChangeLog:
    
            * gfortran.dg/coarray/lock_3.f90: New test.

Diff:
---
 gcc/testsuite/gfortran.dg/coarray/lock_3.f90 | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/gcc/testsuite/gfortran.dg/coarray/lock_3.f90 
b/gcc/testsuite/gfortran.dg/coarray/lock_3.f90
new file mode 100644
index 000000000000..44d55a978417
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/coarray/lock_3.f90
@@ -0,0 +1,24 @@
+! { dg-do run }
+! Test case from PR121360
+program memain
+   use, intrinsic :: iso_fortran_env, only : lock_type
+   type(lock_type), codimension[*] :: lck
+   integer, codimension[*] :: count
+   integer :: i, j, s
+   do j=4,5  ! To be adjusted, dunno how long this runs
+     if (this_image() == 1) count = 0
+     sync all
+     do i=1,10**j
+        lock (lck[1])
+        count[1] = count[1] + 1
+        unlock (lck[1])
+     end do
+     sync all
+     if (this_image() == 1) then
+        !print *,"Expected: ",10**j*num_images(), "Found: ", count[1]
+        if (count[1] .ne. 10**j*num_images()) stop 1
+     end if
+     sync all
+   end do
+end program
+

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