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  1. RHEL
  2. RHEL-35853

nfs: getcwd returns ENOENT in subdirectory of mount after upgrade from RHEL7 to RHEL9

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    • kernel-5.14.0-487.el9
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    • sst_filesystems
    • ssg_filesystems_storage_and_HA
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    • Red Hat Enterprise Linux
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      What were you trying to do that didn't work?

      Reproducer gets ENONET when calling getcwd() in a subdirectory of a nfs mount

      Please provide the package NVR for which bug is seen:

      kernel-5.14.0-362.24.1.el9_3.x86_64

      How reproducible:

      easy, reproducer provided

      Steps to reproduce

      1) Running a python multiprocessing test case, we get a reproducible failure on 'os.cwd()'

      #!/usr/bin/python3 -u

import os
import multiprocessing
import time

if __name__=="__main__":
    multiprocessing.set_start_method("spawn")

    count = 0
    while True:
        try:
            os.getcwd()
            pool = multiprocessing.Pool(10)
            pool.close()
            pool.terminate()
            count += 1
        except Exception as e:
            print(f"Failed after \{count} iterations")
            print(e)
            break

      2: Mount nfs filesystem, create subdirectory, change to subdirectory, execute the script:

      # mount server:/exports /mnt/tmp
# mkdir -p /mnt/tmp/test_getcwd
# cd /mnt/tmp/test_getcwd
# ./test_case3805989
Failed after 8 iterations
[Errno 2] No such file or directory

      Expected results

      getcwd() continues to return successfully

      Actual results

      After one or more iterations, the script will stop after getting ENOENT on a getcwd() syscall:

      #./test_case3805989 
Failed after 8 iterations
[Errno 2] No such file or directory

            rhn-support-smayhew Scott Mayhew
            rhn-support-rahsingh Rahul Singh
            NFS Team NFS Team
            Zhi Li Zhi Li
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              Created:
              Updated: