[Mono-dev] s390x - delegate-async-exit

[Neale Ferguson]

Hi,
 The above test appears to have started failing after
https://github.com/mono/mono/commit/8f7b98b9b23dd5cc42011cff5c5c31b32ae1b55
6 (at least according to the jenkins log). What I’m seeing is that the obj
pointer being passed to major_copy_or_mark_object_no_evacuation is
0x1000000000000:

Thread 2 (Thread 0x3fffaa7b910 (LWP 56738)):
#0  0x000003fffd22df80 in waitpid () from /lib64/libpthread.so.0
#1  0x00000000800afd44 in mono_handle_native_sigsegv (signal=<optimized
out>, ctx=<optimized out>, info=<optimized out>) at mini-exceptions.c:2243
#2  0x000000008001a3a2 in mono_sigsegv_signal_handler (_dummy=11,
_info=0x3fffaa795e8, context=0x3fffaa79668) at mini-runtime.c:2462
#3  <signal handler called>
#4  major_copy_or_mark_object_no_evacuation (queue=<optimized out>,
obj=<optimized out>, ptr=<optimized out>) at
sgen-marksweep-drain-gray-stack.h:133
#5  major_scan_object_no_evacuation (obj=<optimized out>, desc=<optimized
out>, queue=0x803a8cc0 <gray_queue>) at sgen-scan-object.h:74
#6  0x0000000080231276 in drain_gray_stack_no_evacuation (ctx=...) at
sgen-marksweep-drain-gray-stack.h:248
#7  drain_gray_stack (ctx=<error reading variable: value has been
optimized out>) at sgen-marksweep.c:1223
#8  0x0000000080221476 in sgen_drain_gray_stack (max_objs=-1, ctx=<error
reading variable: value has been optimized out>) at sgen-gc.c:552
#9  0x00000000802214e2 in finish_gray_stack (generation=1, ctx=...) at
sgen-gc.c:1095
#10 0x000000008022366a in major_finish_collection (reason=0x80325f98 "user
request", old_next_pin_slot=32, forced=1, scan_whole_nursery=<optimized
out>) at sgen-gc.c:2017
#11 0x0000000080223c3a in major_do_collection (reason=0x80325f98 "user
request", forced=1) at sgen-gc.c:2139
#12 0x0000000080223dc0 in sgen_perform_collection (requested_size=0,
generation_to_collect=1, reason=0x80325f98 "user request",
wait_to_finish=1) at sgen-gc.c:2379
#13 0x00000000802243d2 in sgen_gc_collect (generation=1) at sgen-gc.c:2800
#14 0x00000000801c784e in mono_domain_finalize (domain=0x803f4ee0,
timeout=2000) at gc.c:379
#15 0x0000000080016c82 in mini_cleanup (domain=0x803f4ee0) at
mini-runtime.c:3427
#16 0x0000000080142a62 in ves_icall_System_Environment_Exit (result=0) at
icall.c:6001


I initially wondered about an endian issue with the forwarding bit but

I can’t see anything in that particular push that has anything to do with
this area of code.  I am actively debugging the code now but wondered if
anyone had seen anything that may cause this.

Neale