Re: mISDN_send: error -12 strikes again

Ralf Schlatterbeck wrote:
> Yesterday we had the message "mISDN_send: error -12" filling
> /var/log/kern.log. Restarting asterisk "fixed" it.
>
>   
hi ralf,

i guess it is because chan_lcr runs into deadlock inside asterisk. since
the process of chan_lcr holds a lock and never returns after calling
some asterisk function, bchannel read will not be processed, so the
kernel drops messages to prevent overfill. this is why you receive the
message above.

i suggest do debug which process calls the chan_lcr global lock and
unlock function. then, if asterisk hangs, use gdb to do backtrace all
threads of asterisk. you can see against which lock each thread runs.
since locking mechanism of asterisk is quite complex and unknown to me,
you might be on your own with that.

regards,

andreas