[Mono-dev] Sgen SIGSEGV

[Greg Young]

We can reproduce this reasonably easily under load.

from gdb.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffed7f2700 (LWP 3886)]
copy_object_no_checks (obj=obj at entry=0x7ffff6683150,
    queue=queue at entry=0x9831c0 <gray_queue>) at sgen-copy-object.h:110
110 gboolean has_references = SGEN_VTABLE_HAS_REFERENCES (vt);
(gdb) backtrace
#0  copy_object_no_checks (obj=obj at entry=0x7ffff6683150,
    queue=queue at entry=0x9831c0 <gray_queue>) at sgen-copy-object.h:110
#1  0x00000000005fdec3 in simple_nursery_serial_copy_object_from_obj (
    queue=0x9831c0 <gray_queue>, obj_slot=0x7fffcc8c09c0)
    at sgen-minor-copy-object.h:206
#2  simple_nursery_serial_scan_object (start=<optimized out>,
    queue=0x9831c0 <gray_queue>) at sgen-scan-object.h:64
#3  0x00000000005d9aff in sgen_drain_gray_stack (max_objs=max_objs at entry
=-1,
    ctx=...) at sgen-gc.c:1194
#4  0x00000000005df36e in collect_nursery (unpin_queue=unpin_queue at entry
=0x0,
    finish_up_concurrent_mark=finish_up_concurrent_mark at entry=0)
    at sgen-gc.c:2638
#5  0x00000000005df839 in collect_nursery (finish_up_concurrent_mark=0,
    unpin_queue=0x0) at sgen-gc.c:3554
#6  sgen_perform_collection (requested_size=4096, generation_to_collect=0,
    reason=0x70b2e9 "Nursery full", wait_to_finish=0) at sgen-gc.c:3490
#7  0x00000000005f5dd9 in mono_gc_alloc_obj_nolock (
    vtable=vtable at entry=0xab8680, size=size at entry=576) at sgen-alloc.c:288
#8  0x00000000005f5fe3 in mono_gc_alloc_vector (vtable=0xab8680, size=576,
    max_length=270) at sgen-alloc.c:499
#9  0x00000000400147f9 in ?? ()
#10 0x00007fffb40025d0 in ?? ()
#11 0x0000000000000000 in ?? ()


-- 
Le doute n'est pas une condition agréable, mais la certitude est absurde.
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