On 24.07.2017 08:44, Mark Johnston wrote:
>> Sadly, this time 11.1-STABLE r321371 SMP hangs instead of doing crashdump:
>
> Is this amd64 GENERIC, or something else?
Custom kernel, amd64.
>
>>
>> - "call doadump" from DDB prompt works just fine;
>> - "shutdown -r now" reboots the system without problems;
>> - "sysctl debug.kdb.panic=1" triggers a panic just fine but system hangs
>> just afer showing uptime
>> instead of continuing with crashdump generation; same if "real" panic occurs.
>>
>> Same for debug.minidump set to 1 or 0. How do I debug this?
>
> I'm not able to reproduce the problem in bhyve using r321401. Looking
> at the code, the culprits might be cngrab(), or one of the
> shutdown_post_sync eventhandlers. Since you're apparently able to see
> the console output at the time of the panic, I guess it's probably the
> latter. Could you try your test with the patch below applied? It'll
> print a bunch of "entering post_sync"/"leaving post_sync" messages with
> addresses that can be resolved using kgdb. That'll help determine where
> we're getting stuck.
>
> Index: sys/sys/eventhandler.h
> ===================================================================
> --- sys/sys/eventhandler.h (revision 321401)
> +++ sys/sys/eventhandler.h (working copy)
> @@ -85,7 +85,11 @@
> _t = (struct eventhandler_entry_ ## name *)_ep; \
> CTR1(KTR_EVH, "eventhandler_invoke: executing %p", \
> (void *)_t->eh_func); \
> + if (strcmp(__STRING(name), "shutdown_post_sync") == 0) \
> + printf("entering post_sync %p\n", (void
> *)_t->eh_func); \
> _t->eh_func(_ep->ee_arg , ## __VA_ARGS__); \
> + if (strcmp(__STRING(name), "shutdown_post_sync") == 0) \
> + printf("leaving post_sync %p\n", (void
> *)_t->eh_func); \
> EHL_LOCK((list)); \
> } \
> } \
>
I'l try this evening.
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