[Bug 254244] panics after upgrade to stable/13-n244861-b9773574371

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254244

            Bug ID: 254244
           Summary: panics after upgrade to stable/13-n244861-b9773574371
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: zarychtam at plan-b.pwste.edu.pl

Created attachment 223220
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=223220&action=edit
Some messages caught by syslog

I have upgraded yesterday a bunch of machines to stable/13-n244861-b9773574371
and experience panics on them. There is no possibility to get cores at the
moment, I will work on this after the weekend. The Syslog has caught something
like a prelude to some of the panics: 

Mar 12 13:33:44 opnr kernel: [6004] Fatal trap 12: page fault while in kernel
mode
Mar 12 13:33:44 opnr kernel: [6004] cpuid = 3; apic id = 06
Mar 12 13:33:44 opnr kernel: [6004] fault virtual address       = 0x18
Mar 12 13:33:44 opnr kernel: [6004] fault code          = supervisor read data,
page not present
Mar 12 13:33:44 opnr kernel: [6004] instruction pointer =
0x20:0xffffffff80c77c28
Mar 12 13:33:44 opnr kernel: [6004] stack pointer               =
0x28:0xfffffe00c723f340
Mar 12 13:33:44 opnr kernel: [6004] frame pointer               =
0x28:0xfffffe00c723f3b0
Mar 12 13:33:44 opnr kernel: [6004] code segment                = base 0x0,
limit 0xfffff, type 0x1b
Mar 12 13:33:44 opnr kernel: [6004]                     = DPL 0, pres 1, long
1, def32 0, gran 1
Mar 12 13:33:44 opnr kernel: [6004] processor eflags    = interrupt enabled,
resume, IOPL = 0
Mar 12 13:33:44 opnr kernel: [6004] current process             = 0
(if_io_tqg_3)

More traces in the file attached.

Both affected machines have Atom C2758 CPU. I have been testing 13.0-STABLE on
them for a month with no issues so far. The last working build was
stable/13-n244798-05083436a6e from Sun Mar  7.

Access to the machines is limited, swap is configured on the ZFS and netdumps
not possible due to network configuration (vlan(4)s, over LACP lagg(4)).

I will try to configure the USB drive as a device to save crash dumps if such a
scenario will be possible.

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