@sasikumarpc - We observed this scenario where the PERC goes offline: sgl_ptr->Address = fffffffffffff000 sgl_ptr->Length = 1000
We do not see a roll-over here.. Kernel is indicating to read 0x1000 bytes starting from address 0xfffffffffffff000 i.e till 0xffffffffffffffff which very well aligns with 64 bit dma_mask being assigned by megaraid_sas driver. Looks like kernel is working as expected based on the dma_mask set by megaraid_sas driver. Once the 32bit address gets exhausted, the kernel tries to get buffer based on 64bit dma_mask top-down. We are suspecting that the PERC firmware might not be able to handle this corner case. PERC did not go offline by changing the dma_mask to 63, and these initial results looks to be supporting this stance on fw. Can you please check this and revert? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795453 Title: IO's are issued with incorrect Scatter Gather Buffer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795453/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
