Hey Linus, /* Summary */ During the pipe nonblock rework that made it in the check for both O_NONBLOCK and IOCB_NOWAIT was dropped. Both checks need to be performed to ensure that files without O_NONBLOCK but IOCB_NOWAIT don't block when writing to or reading from a pipe. This just contains the fix adding the check for IOCB_NOWAIT back in. --- On a personal note, I'm still traveling because of LSFMMBPF (I'm probably missing 5 letters and rearranging 3) and LSS and will only be back on a regular schedule starting Tuesday. /* Testing */ clang: Ubuntu clang version 15.0.6 gcc: (Ubuntu 12.2.0-3ubuntu1) 12.2.0 All patches are based on 6.4-rc1 and have been sitting in linux-next. No build failures or warnings were observed. All old and new tests in fstests, selftests, and LTP pass without regressions. /* Conflicts */ At the time of creating this PR no merge conflicts were reported from linux-next and no merge conflicts showed up doing a test-merge with current mainline. The following changes since commit ac9a78681b921877518763ba0e89202254349d1b: Linux 6.4-rc1 (2023-05-07 13:34:35 -0700) are available in the Git repository at: git@xxxxxxxxxxxxxxxxxxx:pub/scm/linux/kernel/git/vfs/vfs tags/vfs/v6.4-rc1/pipe for you to fetch changes up to c04fe8e32f907ea668f3f802387c1148fdb0e6c9: pipe: check for IOCB_NOWAIT alongside O_NONBLOCK (2023-05-12 17:17:27 +0200) Please consider pulling these changes from the signed vfs/v6.4-rc1/pipe tag. Thanks! Christian ---------------------------------------------------------------- vfs/v6.4-rc1/pipe ---------------------------------------------------------------- Jens Axboe (1): pipe: check for IOCB_NOWAIT alongside O_NONBLOCK fs/pipe.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)