[Bug 243867] random fork_trampoline() panic on Dell R540

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243867

            Bug ID: 243867
           Summary: random fork_trampoline() panic on Dell R540
           Product: Base System
           Version: 11.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: oleg.cherkasov at linux.com

Created attachment 211341
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=211341&action=edit
stack trace dump from the iDRAC virtual console

Hi,

One of our Dell R540 servers have period issue since few months ago put in
production.  Eventually it reboots every ~25 days with not minidumps or
messages in logs.  The suspicion was the motherboard and it had been replaced
by Dell before Xmas so it helped to keep the server running for more then 40
days and then it happen again, and than again in less than 2 days.

Yesterday the server stopped responding and after quick glance at iDRAC virtual
console it reveal the panic screen, see attached screenshot.  Unfortunately I
failed to scroll the screen up because of iDRAC virtual console.

The swap is 24Gb and Dumping stalled for 10-15 so I had to cold reboot because
of no actions.

Any ideas if it a hardware or software issue?

The system has been upgraded to 11.3-RELEASE-p6 recently.  It is Dell R540 with
128Gb RAM, Dell BOSS NVME RAID0, H730P raid controller with 12 JBOD disks + HBA
connected MD1400 via multipath 12 disks.  2 VDEVs ZFS pool, the system is on
UFS partition on M.2/BOSS flash disk.

/boot/device.hints:

hw.mfi.mrsas_enable="1"


/boot/loader.conf.local:

vm.kmem_size_max=130000000000
vm.kmem_size=130000000000
vfs.zfs.arc_max=128000000000
vm.pmap.pti=0
hw.ibrs_disable=1
hw.spec_store_bypass_disable=1
geom_multipath_load="YES"


The system is 100% NAS with samba 4.10, so jails or VMs or active users.

Appreciate any ideas how to debug or diagnose the issue.

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