[Bug 246004] Kernel Panic after moderate amount of activity

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246004

            Bug ID: 246004
           Summary: Kernel Panic after moderate amount of activity
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: sbruno at FreeBSD.org

The freebsd.org pkg builders and ref machines are unable to stay online for
more than a day at this point whenever they start any moderate amount of
activity. I've run the onboard hardware memory test for 3 days straight with no
errors and no lockups.

Looking to start some reasonable amount of debugging to get these machines back
into service.  Any advice is welcome.

The panics all seem to look like the following:

  x0:         40b32400
  x1:         40a0b3d8
  x2:                0
  x3:                0
  x4:         40100401
  x5:     800000000808
  x6:           25e440
  x7:            26ced
  x8:                2
  x9:                0
 x10:         40a0b818
 x11:           25e000
 x12:           25e000
 x13:           25e000
 x14:               63
 x15:                0
 x16:           25a870
 x17:         4048f880
 x18:               35
 x19:           204b9e
 x20:           25e450
 x21:                0
 x22:                0
 x23:         40a0b810
 x24:           25e000
 x25:           25e000
 x26:                0
 x27:                0
 x28:         40bf3360
 x29:     ffffffffd180
  sp:     ffffffffcec0
  lr:           21db5c
 elr:           2290fc
spsr:         60000200
 far:         40b32400
 esr:         be000000
timeout stopping cpus
panic: Unhandled System Error
cpuid = 8
time = 1588034425
KDB: stack backtrace:
db_trace_self() at db_trace_self_wrapper+0x28
         pc = 0xffff0000008f1754  lr = 0xffff00000023fcac
         sp = 0xffff00015d9de520  fp = 0xffff00015d9de720

db_trace_self_wrapper() at vpanic+0x194
         pc = 0xffff00000023fcac  lr = 0xffff00000055c718
         sp = 0xffff00015d9de730  fp = 0xffff00015d9de780

vpanic() at panic+0x44
         pc = 0xffff00000055c718  lr = 0xffff00000055c580
         sp = 0xffff00015d9de790  fp = 0xffff00015d9de840

panic() at do_serror+0x40
         pc = 0xffff00000055c580  lr = 0xffff0000009106c0
         sp = 0xffff00015d9de850  fp = 0xffff00015d9de850

do_serror() at handle_serror+0x88
         pc = 0xffff0000009106c0  lr = 0xffff0000008f449c
         sp = 0xffff00015d9de860  fp = 0xffff00015d9de980

handle_serror() at 0x21db58
         pc = 0xffff0000008f449c  lr = 0x000000000021db58
         sp = 0xffff00015d9de990  fp = 0x0000ffffffffd180

KDB: enter: panic
[ thread pid 17906 tid 101021 ]
Stopped at      0x2290fc

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