NetScaler Crashing after an upgrade to  12.0.58.15.nc.

Fix will be available in future release 12.0.59.x.

Current resolution: downgrade to 12.0.53.13. Disable AppFirewall as a measure to stabilize the environment. 

Fix will be available in future release 12.0.59.x. Current resolution : downgrade to 12.0.53.13 Disable AppFirewall as a measure to stabilize the environment. 

Summary    This case has potential OneBug Matches. Please research the OneBug(s) and any related cases listed below to determine if a match exists. If there is any confusion about next steps, please engage DevAnalysis with a new case
OneBug Reference Bug(s)    712938-VPX instances issue after upgrading 12.0 56.2 -> 12.0 58.15 (SR#78168927)-- 66% frames of the crash are matching to this onebug entry
Master Case    78173615
Details    Version: 12.0
Build: 58.15
Signal: 11
Crashing Instruction: 0x91be41d
Crashing Function: as_yield_debug_record_callers
Backtace:
bt
#0 0x0930fcc3 in kill () at kill.S:3
#1 0x0909342e in ns_stub_kill (pid=3262, sig=11) at /home/build/rs_120_58_8_RTM/usr.src/sys/netscaler/ns_libc_stubs.c:703
#2 0x09092166 in nsppe_signal_handler (signo=<optimized out>) at /home/build/rs_120_58_8_RTM/usr.src/sys/netscaler/nsppe_utils.c:371
#3 <signal handler called>
#4 0x091be41d in as_yield_debug_record_callers () at /home/build/rs_120_58_8_RTM/usr.src/sys/appsecure/as_yield.h:36
#5 as_yield_on_time_limit () at /home/build/rs_120_58_8_RTM/usr.src/sys/appsecure/as_yield.h:81
#6 as_match_signatures (as_ctxt=0x233dd010, location=AS_LOC_HTTP_POST_BODY) at /home/build/rs_120_58_8_RTM/usr.src/sys/appsecure/as_process.c:6289
#7 0x091c4942 in as_process_request_body (arg=0x293d3890) at /home/build/rs_120_58_8_RTM/usr.src/sys/appsecure/as_process.c:3207
#8 0x09180d90 in uthread_start () at /home/build/rs_120_58_8_RTM/usr.src/sys/modutil/ns_uthread.c:404
#9 0x09304d5f in _ctx_start () at /home/build/rs_120_58_8_RTM/usr.src/lib/libc/i386/gen/_ctx_start.S:43