Was playing with pmcstats -S instructions -T, and got the following when
I tried to ctrl/c out.

oldtbh.lerctr.org dumped core - see /var/crash/vmcore.3

Wed Aug 26 16:05:16 CDT 2015

FreeBSD oldtbh.lerctr.org 11.0-CURRENT FreeBSD 11.0-CURRENT #18 r287033: Sun 
Aug 23 18:08:24 CDT 2015     r...@oldtbh.lerctr.org:/usr/obj/usr/src/sys/VT-LER 

panic: [p4,700] class mismatch pd 260 != id class 4

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Unread portion of the kernel message buffer:
panic: [p4,700] class mismatch pd 260 != id class 4
cpuid = 1
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0238744770
vpanic() at vpanic+0x189/frame 0xfffffe02387447f0
kassert_panic() at kassert_panic+0x132/frame 0xfffffe0238744860
p4_read_pmc() at p4_read_pmc+0x185/frame 0xfffffe02387448b0
pmc_stop() at pmc_stop+0x132/frame 0xfffffe02387448f0
pmc_syscall_handler() at pmc_syscall_handler+0x1752/frame 0xfffffe0238744ae0
amd64_syscall() at amd64_syscall+0x25d/frame 0xfffffe0238744bf0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe0238744bf0
--- syscall (0, FreeBSD ELF64, nosys), rip = 0x801407ffa, rsp = 0x7fffffffe588, 
rbp = 0x7fffffffe5a0 ---
Uptime: 2d8h36m19s
Dumping 3475 out of 8158 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%

Reading symbols from /boot/kernel/if_lagg.ko.symbols...done.
Loaded symbols for /boot/kernel/if_lagg.ko.symbols
Reading symbols from /boot/kernel/hwpmc.ko.symbols...done.
Loaded symbols for /boot/kernel/hwpmc.ko.symbols
#0  doadump (textdump=1) at pcpu.h:221
221     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump (textdump=1) at pcpu.h:221
#1  0xffffffff80b34ca5 in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:329
#2  0xffffffff80b35298 in vpanic (fmt=<value optimized out>, 
    ap=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:626
#3  0xffffffff80b350c2 in kassert_panic (fmt=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:516
#4  0xffffffff8242ee25 in p4_read_pmc (cpu=1, ri=12, v=0xfffff8012b206aa0)
    at /usr/src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_piv.c:699
#5  0xffffffff82425102 in pmc_stop (pm=0xfffff8012b206a80)
    at /usr/src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_mod.c:2741
#6  0xffffffff82423a12 in pmc_syscall_handler (td=<value optimized out>, 
    syscall_args=<value optimized out>)
    at /usr/src/sys/modules/hwpmc/../../dev/hwpmc/hwpmc_mod.c:3923
#7  0xffffffff80f7c38d in amd64_syscall (td=0xfffff801060759a0, traced=0)
    at subr_syscall.c:133
#8  0xffffffff80f5b26b in Xfast_syscall ()
    at /usr/src/sys/amd64/amd64/exception.S:395
#9  0x0000000801407ffa in ?? ()
Previous frame inner to this frame (corrupt stack?)
Current language:  auto; currently minimal

vmcore IS available, and I *CAN* give ssh access.

Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640                 E-Mail: l...@lerctr.org
US Mail: 7011 W Parmer Ln, Apt 1115, Austin, TX 78729-6961
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