Hi Daniel, On 01/05/2012 08:59 AM, Daniel Wagner wrote: > Hi, > > I just managed to get this backtrace: > > ofonod[1808]: ++++++++ backtrace ++++++++ > ofonod[1808]: #0 0x3366c0f500 in /lib64/libpthread.so.0 > ofonod[1808]: #1 0x3366836285 in /lib64/libc.so.6 > ofonod[1808]: #2 0x3366837b9b in /lib64/libc.so.6 > ofonod[1808]: #3 0x336982fd85 in /lib64/libdbus-1.so.3 > ofonod[1808]: #4 0x3369826e31 in /lib64/libdbus-1.so.3 > ofonod[1808]: #5 0x336981b806 in /lib64/libdbus-1.so.3 > ofonod[1808]: #6 0x4db083 in pri_activate_callback() at src/gprs.c:871 > ofonod[1808]: #7 0x4611cf in ppp_connect() at drivers/atmodem/gprs-context.c:101 > ofonod[1808]: #8 0x447fdd in ppp_ipcp_up_notify() at gatchat/gatppp.c:415 > ofonod[1808]: #9 0x44bdbc in ipcp_up() at gatchat/ppp_ipcp.c:173 > ofonod[1808]: #10 0x44911d in pppcp_this_layer_up() at gatchat/ppp_cp.c:322 > ofonod[1808]: #11 0x449e5e in pppcp_generate_event() at gatchat/ppp_cp.c:690 > ofonod[1808]: #12 0x44a68b in pppcp_process_packet() at gatchat/ppp_cp.c:967 > ofonod[1808]: #13 0x447905 in ppp_receive() at gatchat/gatppp.c:224 > ofonod[1808]: #14 0x446994 in new_bytes() at gatchat/gathdlc.c:301 > ofonod[1808]: #15 0x43edf3 in received_data() at gatchat/gatio.c:124 > ofonod[1808]: #16 0x3368844a7d in /lib64/libglib-2.0.so.0 > ofonod[1808]: #17 0x3368845278 in /lib64/libglib-2.0.so.0 > ofonod[1808]: #18 0x33688457c5 in /lib64/libglib-2.0.so.0 > ofonod[1808]: #19 0x496c4e in main() at src/main.c:262 > ofonod[1808]: #20 0x336682169d in /lib64/libc.so.6 > ofonod[1808]: +++++++++++++++++++++++++++ > > > static void pri_activate_callback(const struct ofono_error *error, void *data) > { > [...] > > __ofono_dbus_pending_reply(&ctx->pending, > dbus_message_new_method_return(ctx->pending)); > > [...] > } > > I guess ctx->pending is NULL. > Sounds like it, but this makes no sense; pending is set right above the single instance of the driver operation with pri_activate_callback as the callback. The only way for this to happen is if the callback is being called twice or some other interesting circumstance... Can you duplicate this reliably?