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If `O_PATH` flag is used with the call to obtain a fh; the internal function handling async I/O does check for the O_PATH flag and returns EBADF (since no I/O operations are directly possible with the fh obtained using `O_PATH` flag) but doesn't take care of the callback and the caller gets stalled, therefore complete the context while returning EBADF in Client::_preadv_pwritev_locked():

int64_t Client::_preadv_pwritev_locked(Fh *fh, const struct iovec *iov,
                                       unsigned iovcnt, int64_t offset,
                                       bool write, bool clamp_to_int,
                                       Context *onfinish, bufferlist *blp,
                                       bool do_fsync, bool syncdataonly)
{
ceph_assert(ceph_mutex_is_locked_by_me(client_lock));

#if defined(__linux__) && defined(O_PATH)
    if (fh->flags & O_PATH)
        return -CEPHFS_EBADF;