[Bug 232075] 12-ALPHA8 page fault in kernel mode

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232075

            Bug ID: 232075
           Summary: 12-ALPHA8 page fault in kernel mode
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: gldisater at gmail.com

Fatal trap 12: page fault while in kernel mode
cpuid = 13; apic id = 33
fault virtual address = 0x3c8
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xfffffffff80b94b64
stack pointer = 0x28:0xfffffe017d0f85c0
frame pointer = 0x28:0cfffffe017d0f85f0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 2625 (zfs)
[ thread pid 2625 tid 102072 ]
Stopped at _sx_xlock+0x44: movq 0x18(%rbx),%rax


system was under moderate load doing a zfs send/recv from one drive into the
main pool while trying to unmount some zfs datasets. kernel dump to follow.

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