Hello,
Please apply the patch "nvme: Fix parsing of ANA log page" to 5.4.
The commit ID in Linus's tree is: 64fab7290dc3561729bbc1e35895a517eb2e549e
The patch was originally submitted on the linux-nvme mailing list, but for reasons unknown to me it never landed on 5.4 - this thread indicates it should have been accepted for 5.4. https://lore.kernel.org/linux-nvme/1572303408-37913-1-git-send-email-psajeep...
Without the patch, we perform the check WARN_ON_ONCE(offset > ctrl->ana_log_size - sizeof(*desc)) at the end of the enclosing loop. This check only makes sense if we are about to read another nvme_ana_group_desc from the ana_log_buf, but that's not the case at the end of the last iteration of the loop. In the last iteration, the warning fires and the function nvme_parse_ana_log fails. When nvme native multipath is enabled, this translates into failure to establish a connection to the controller.
The patch fixes the issue by moving the above check to a correct position within the loop body.
Thanks, Uday Shankar