Here is the  dmesg extended dump for the  stall you mailed me about earlier

sequence is

boot params
   initcall_debug  log_buf_len=512k

at stall

ALT + Sys Req  + P
small amout of output (8-9 lines)

then

ALT + Sys Req +T
about 500+ lines of trace

wait about 100 Seconds

boot continues