[Bug 204273] panic: [pmc,4204] cpu 0 didn't find a sample to collect

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204273

            Bug ID: 204273
           Summary: panic: [pmc,4204] cpu 0 didn't find a sample to
                    collect
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: emaste at freebsd.org

pmccontrol -L - see the things
pmcstat -S CPU_CYCLES -T -w 1

.. and panic.

panic: [pmc,4204] cpu 0 didn't find a sample to collect               
[71/1850]
cpuid = 0
KDB: stack backtrace:
db_trace_self() at db_trace_self_wrapper+0x28
         pc = 0xffffff80004d6254  lr = 0xffffff800006d888
         sp = 0xffffff87cc2156f0  fp = 0xffffff87cc215810

db_trace_self_wrapper() at vpanic+0x170
         pc = 0xffffff800006d888  lr = 0xffffff800025abd0
         sp = 0xffffff87cc215820  fp = 0xffffff87cc2158a0

vpanic() at kassert_panic+0x160
         pc = 0xffffff800025abd0  lr = 0xffffff800025aa5c
         sp = 0xffffff87cc2158b0  fp = 0xffffff87cc215970

kassert_panic() at pmc_capture_user_callchain+0x134
         pc = 0xffffff800025aa5c  lr = 0xffffff8047e2b1e8
         sp = 0xffffff87cc215980  fp = 0xffffff87cc2159d0

pmc_capture_user_callchain() at pmc_hook_handler+0x4a0
         pc = 0xffffff8047e2b1e8  lr = 0xffffff8047e296e8
         sp = 0xffffff87cc2159e0  fp = 0xffffff87cc215a60

pmc_hook_handler() at ast+0x14cCYCLES -T -w 1                         
[48/1850]
         pc = 0xffffff8047e296e8  lr = 0xffffff80002a5c20
         sp = 0xffffff87cc215a70  fp = 0xffffff87cc215aa0

ast() at handle_el0_irq+0x88
         pc = 0xffffff80002a5c20  lr = 0xffffff80004d72e8
         sp = 0xffffff87cc215ab0  fp = 0x0000007fffff40e0

KDB: enter: panic
[ thread pid 3341 tid 100475 ]
Stopped at      kdb_enter+0x40:
db> call doadump
Dumping 3761 out of 131034 MB:..1%(ada0:ahcich0:0:0:0): WRITE_DMA. ACB: ca 00
40
 9d ca 46 00 00 00 00 08 00
(ada0:ahcich0:0:0:0): CAM status: CCB request was invalid
(ada0:ahcich0:0:0:0): Error 22, Unretryable error
Aborting dump due to I/O error.

** DUMP FAILED (ERROR 22) **
= 0x16
db>

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