[Bug 234042] panics on 12.0-RELEASE: swi4: clock(0), instruction pointer 0x0

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234042

            Bug ID: 234042
           Summary: panics on 12.0-RELEASE: swi4: clock(0), instruction
                    pointer 0x0
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: mandrews at bit0.com

Created attachment 200136
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=200136&action=edit
dmesg.boot

Since updating from 11.2 to 12.0-RELEASE, two of our systems have given this
same panic a total of three times in the last 24 hours.  Usually the
instruction pointer is 0, but not always:

---

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address   = 0x0
fault code              = supervisor read instruction, page not present
instruction pointer     = 0x20:0x0
stack pointer           = 0x28:0xfffffe0000470a78
frame pointer           = 0x28:0xfffffe0000470b20
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         = 12 (swi4: clock (0))
trap number             = 12
panic: page fault
cpuid = 1
time = 1544894686
KDB: stack backtrace:
#0 0xffffffff80be7977 at kdb_backtrace+0x67
#1 0xffffffff80b9b563 at vpanic+0x1a3
#2 0xffffffff80b9b3b3 at panic+0x43
#3 0xffffffff8107496f at trap_fatal+0x35f
#4 0xffffffff810749c9 at trap_pfault+0x49
#5 0xffffffff81073fee at trap+0x29e
#6 0xffffffff8104f1d5 at calltrap+0x8
#7 0xffffffff80bb5a39 at softclock+0x79
#8 0xffffffff80b5ee17 at ithread_loop+0x1a7
#9 0xffffffff80b5bf33 at fork_exit+0x83
#10 0xffffffff810501be at fork_trampoline+0xe
Uptime: 1d18h48m53s

---

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x158
fault code              = supervisor read instruction, page not present
instruction pointer     = 0x20:0x158
stack pointer           = 0x28:0xfffffe0000470a78
frame pointer           = 0x28:0xfffffe0000470b20
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         = 12 (swi4: clock (0))
trap number             = 12
panic: page fault
cpuid = 0
time = 1544781943
KDB: stack backtrace:
#0 0xffffffff80be7977 at kdb_backtrace+0x67
#1 0xffffffff80b9b563 at vpanic+0x1a3
#2 0xffffffff80b9b3b3 at panic+0x43
#3 0xffffffff8107496f at trap_fatal+0x35f
#4 0xffffffff810749c9 at trap_pfault+0x49
#5 0xffffffff81073fee at trap+0x29e
#6 0xffffffff8104f1d5 at calltrap+0x8
#7 0xffffffff80bb5a39 at softclock+0x79
#8 0xffffffff80b5ee17 at ithread_loop+0x1a7
#9 0xffffffff80b5bf33 at fork_exit+0x83
#10 0xffffffff810501be at fork_trampoline+0xe
Uptime: 11h29m48s

---

Fatal trap 12: page fault while in kernel mode
cpuid = 6; apic id = 14
fault virtual address   = 0x0
fault code              = supervisor read instruction, page not present
instruction pointer     = 0x20:0x0
stack pointer           = 0x0:0xfffffe0000470a78
frame pointer           = 0x0:0xfffffe0000470b20
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         = 12 (swi4: clock (0))
trap number             = 12
panic: page fault
cpuid = 6
time = 1544887543
KDB: stack backtrace:
#0 0xffffffff80be7977 at kdb_backtrace+0x67
#1 0xffffffff80b9b563 at vpanic+0x1a3
#2 0xffffffff80b9b3b3 at panic+0x43
#3 0xffffffff8107496f at trap_fatal+0x35f
#4 0xffffffff810749c9 at trap_pfault+0x49
#5 0xffffffff81073fee at trap+0x29e
#6 0xffffffff8104f1d5 at calltrap+0x8
#7 0xffffffff80bb5a39 at softclock+0x79
#8 0xffffffff80b5ee17 at ithread_loop+0x1a7
#9 0xffffffff80b5bf33 at fork_exit+0x83
#10 0xffffffff810501be at fork_trampoline+0xe
Uptime: 1d5h17m30s

---

Both systems are identical (a bit old, though) Supermicro 5016T-MTFB. 
dmesg.boot from one of them is attached.

I don't have dumps of these, for some reason -- I'm looking into why so I can
capture the next one.

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