assertion pageind >= map_bias

Jason Evans jasone at
Mon Aug 17 16:02:45 PDT 2015

On Aug 3, 2015, at 4:02 PM, marko at wrote:
> We are using jemalloc in our internal project and we have been experiencing very strange memory corruptions lately, so we decided to build jemalloc with --enable-debug and --enable-fill and give it a try.
> Also, we used this env variable: MALLOC_CONF=tcache:false,redzone:true,stats_print:true
> jemalloc version is 3.6.0
> This is what we are seeing in logs:
> <jemalloc>: include/jemalloc/internal/arena.h:508: Failed assertion: "pageind >= map_bias"
> Can you tell us anything about this assertion?
> Is there a way this could happen? Is it a possible bug in jemalloc or is it more likely that this is some random corruption in internal jemalloc structures?

I can't guess much about the nature of the memory corruption a backtrace through the jemalloc functions.  If you're still experiencing this issue, please post a backtrace and I'll take a look.


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