[Bug 201245] panic: spin lock held too long

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201245

            Bug ID: 201245
           Summary: panic: spin lock held too long
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: sparc64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: lidl at pix.net

Created attachment 158219
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=158219&action=edit
core.txt.0 from panic

Noticed during testing of the 10.2-PRERELEASE iso image on a
dual-processor V240 UltraSparc:

Setting hostname: spork.pix.net.
bge0: link state changed to DOWN
spin lock 0xc0cb9e38 (smp rendezvous) held by 0xfffff80003e93240 (tid 100340)
too long
timeout stopping cpus
panic: spin lock held too long
cpuid = 1
KDB: stack backtrace:
#0 0xc0575380 at panic+0x20
#1 0xc0558e10 at _mtx_lock_spin_failed+0x50
#2 0xc0558ed8 at _mtx_lock_spin_cookie+0xb8
#3 0xc08d7b9c at tick_get_timecount_mp+0xdc
#4 0xc0583c88 at binuptime+0x48
#5 0xc08a3b8c at timercb+0x6c
#6 0xc08d7f00 at tick_intr+0x220
Uptime: 29s
Dumping 8192 MB (4 chunks)
  chunk at 0: 2147483648 bytes ... ok
  chunk at 0x100000000: 2147483648 bytes ... ok
  chunk at 0x1000000000: 2147483648 bytes ... ok
  chunk at 0x1100000000: 2147483648 bytes ... ok

Dump complete

This bug has been ongoing for quite a while.  Chris Ross dug up some
references to it, as explained here:

https://lists.freebsd.org/pipermail/freebsd-stable/2015-July/082635.html

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