`<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">I've been experiencing an error for some time that's been driving me bonkers. One of my servers (currently running r151020) has a JBOD enclosure with 84 x 8TB Seagate Archive drives. I now know we should've avoided those horribly slow drives but, the price was right and now I'm stuck with them. The problem is after about 30 minutes of very heavy reads on those disks (no writes at all), the system panics with the following backtrace:</div><div class=""><br class=""></div><div class="">ffffff00f58e1920 genunix:vmem_hash_delete+9b ()<br class="">ffffff00f58e1980 genunix:vmem_xfree+4b ()<br class="">ffffff00f58e19b0 genunix:vmem_free+23 ()<br class="">ffffff00f58e1a00 genunix:rmfree+6e ()<br class="">ffffff00f58e1a30 mpt_sas:mptsas_pkt_destroy_extern+cf ()<br class="">ffffff00f58e1a60 mpt_sas:mptsas_scsi_destroy_pkt+75 ()<br class="">ffffff00f58e1a80 scsi:scsi_destroy_pkt+1a ()<br class="">ffffff00f58e1ad0 ses:ses_callback+c1 ()<br class="">ffffff00f58e1b00 mpt_sas:mptsas_pkt_comp+2b ()<br class="">ffffff00f58e1b50 mpt_sas:mptsas_doneq_empty+ae ()<br class="">ffffff00f58e1b90 mpt_sas:mptsas_intr+177 ()<br class="">ffffff00f58e1be0 apix:apix_dispatch_by_vector+8c ()<br class="">ffffff00f58e1c20 apix:apix_dispatch_lowlevel+25 ()<br class="">ffffff00f58999e0 unix:switch_sp_and_call+13 ()<br class="">ffffff00f5899a40 apix:apix_do_interrupt+387 ()<br class="">ffffff00f5899a50 unix:_interrupt+ba ()<br class="">ffffff00f5899bc0 unix:acpi_cpu_cstate+11b ()<br class="">ffffff00f5899bf0 unix:cpu_acpi_idle+8d ()<br class="">ffffff00f5899c00 unix:cpu_idle_adaptive+13 ()<br class="">ffffff00f5899c20 unix:idle+a7 ()<br class="">ffffff00f5899c30 unix:thread_start+8 ()<br class=""><br class=""></div><div class="">After some googling I found this which I thiiiink seems to have addressed the underlying issue:</div><div class=""><a href="https://www.illumos.org/issues/5698" class="">https://www.illumos.org/issues/5698</a></div><div class="">via this commit:</div><div class=""><a href="https://github.com/illumos/illumos-gate/commit/2482ae1b96a558eec551575934d5f06c87b807af" class="">https://github.com/illumos/illumos-gate/commit/2482ae1b96a558eec551575934d5f06c87b807af</a></div><div class=""><br class=""></div><div class="">I'm not very familiar with the Illumos build system, so I was hoping someone could give me a pointer as to how I could just build this updated mpt_sas driver (can I just build it alone or do I have to build the entire system?). Of course if that pull could be released as an OmniOS update, that'd be even better ;)</div><div class=""><br class=""></div><div class="">Thanks,</div><div class=""><br class=""></div><div class="">Michael</div></body></html>`