Hot-added new hard disk attached to LSI Logic SAS controller cannot be detected in some distributions, including Ubuntu 22.04 and later.

Products

• VMware vSphere ESXi 8.0

Issue/Introduction

When a user hot-adds a new hard disk and attaches it to an LSI Logic SAS controller on a VM, the newly added disk is not detected by the Linux guest OS. The 'fdisk -l' command fails to list the newly added disk.

Simultaneously adding an LSI Logic SAS controller and a disk will result in a call trace in guest OS versions from Ubuntu 22.04 to Ubuntu 24.10, as shown below:

   [ 176.181166] ================================================================================
   [ 176.181167] UBSAN: array-index-out-of-bounds in /build/linux-IPoq5q/linux-6.5.0/drivers/message/fusion/mptsas.c:2448:22
   [ 176.181171] index 1 is out of range for type 'MPI_SAS_IO_UNIT0_PHY_DATA [1]'
   [ 176.181174] CPU: 0 PID: 2102 Comm: (udev-worker) Not tainted 6.5.0-5-generic #5-Ubuntu
   [ 176.181177] Hardware name: VMware, Inc. VMware20,1/440BX Desktop Reference Platform, BIOS
      VMW201.00V.21805430.B64.2305221830 05/22/2023
   [ 176.181179] Call Trace:
   [ 176.181181] <TASK>
   [ 176.181183] dump_stack_lvl+0x48/0x70
   [ 176.181228] dump_stack+0x10/0x20
   [ 176.181232] __ubsan_handle_out_of_bounds+0xc6/0x110
   [ 176.181236] mptsas_sas_io_unit_pg0+0x3b1/0x3f0 [mptsas]
   [ 176.181248] mptsas_probe_hba_phys.isra.0+0x55/0x490 [mptsas]

Cause

This is an upstream Linux kernel issue where the hot add event is not handled in time by the kernel.

Resolution

Workaround:

After hot-adding an LSI Logic SAS disk, reboot the VM if the 'fdisk -l' command fails to list the newly added disk.

Additional Information

Impact/Risks:

User may not be able to use hot-added LSI Logic SAS disk.