#1173: NCI segfaults with null pcc_params_signature
----------------------+-----------------------------------------------------
Reporter: jhorwitz | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: none | Version:
Severity: medium | Keywords:
Lang: | Patch:
Platform: |
----------------------+-----------------------------------------------------
Description changed by whiteknight:
Old description:
> changes in r32203 cause mod_parrot to segfault, as the param signature is
> an uninitialized string. specifically, the pcc_params_signature NCI
> attribute is null. not sure if this corresponds to a specific parrot
> test...
>
> creating the signature as a constant string appears to cause this
> problem,
> as removing PObj_constant_FLAG from src/pmc/nci.pmc:82 "fixes" the issue,
> though that's most certainly not a solution.
>
> chromatic thinks we need more COW: "My theory is that the JIT STRING
> conversion needs a Parrot_make_COW_reference."
>
> tewk has a workaround: "short-term comment tools/build/nativecall.pl:308
> to disable jitted NCI"
>
> backtrace is included, now with more stack smashing!
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x40798304 in Parrot_init_arg_sig (interp_unused=0x81b7bf8,
> ctx=0x832fd78,
> sig=0x0, ap=0x0, sti=0xbffff398) at src/inter_call.c:422
> 422 if (*sig) {
> (gdb) bt
> #0 0x40798304 in Parrot_init_arg_sig (interp_unused=0x81b7bf8,
> ctx=0x832fd78,
> sig=0x0, ap=0x0, sti=0xbffff398) at src/inter_call.c:422
> #1 0x40797f6c in Parrot_init_arg_nci (interp=0x81b7bf8, st=0xbffff36c,
> sig=0x0) at src/inter_call.c:276
> #2 0x082f6451 in ?? ()
> #3 0x081b7bf8 in ?? ()
> #4 0xbffff36c in ?? ()
> #5 0x00000000 in ?? ()
> #6 0x08193458 in ?? ()
> #7 0x08310418 in ?? ()
> #8 0x00000200 in ?? ()
> #9 0x40cdd2d8 in ?? ()
> #10 0x082dda10 in ?? ()
> #11 0x0832fd78 in ?? ()
> #12 0x00000001 in ?? ()
> #13 0x00000000 in ?? ()
> #14 0x00000000 in ?? ()
> #15 0x00000000 in ?? ()
> #16 0x00000000 in ?? ()
> #17 0x081b7bf8 in ?? ()
> #18 0x08193458 in ?? ()
> #19 0x00000100 in ?? ()
> #20 0x407a0bc3 in key_next (interp=0x81b7bf8, key=0x82e1f4c) at
> src/key.c:480
> #21 0x40938a6e in Parrot_NCI_invoke (interp=0x81b7bf8, pmc=0x82e1f4c,
> next=0x40cdd2ec) at nci.pmc:303
> #22 0x40717116 in Parrot_invokecc_p (cur_opcode=0x40cdd2e4,
> interp=0x81b7bf8)
> at core.ops:475
> #23 0x407cd83c in runops_slow_core (interp=0x81b7bf8, pc=0x40cdd2e4)
> at src/runops_cores.c:222
> #24 0x4079edb9 in runops_int (interp=0x81b7bf8, offset=80)
> at src/interpreter.c:938
> #25 0x4079f65f in runops (interp=0x81b7bf8, offs=80) at
> src/inter_run.c:101
> #26 0x4079f904 in runops_args (interp=0x81b7bf8, sub=0x82dd7fc,
> obj=0x8328fd4,
> meth_unused=0x826cc5c, sig=0x40ad50e5 "v", ap=0xbffff594 "\2172\b")
> at src/inter_run.c:236
> #27 0x4079fc96 in Parrot_run_meth_fromc_args (interp=0x81b7bf8,
> sub=0x82dd7fc,
> obj=0x8328fd4, meth=0x826cc5c, sig=0x40ad50e5 "v") at
> src/inter_run.c:426
> #28 0x409a9042 in initialize_parents (interp=0x81b7bf8, object=0x8328fd4,
> all_parents=0x8329108) at class.pmc:344
> #29 0x409aaf7c in Parrot_Class_instantiate (interp=0x81b7bf8,
> pmc=0x832923c,
> init=0x82c8028) at class.pmc:1131
> #30 0x40736446 in Parrot_new_p_pc (cur_opcode=0x40c981b0,
> interp=0x81b7bf8)
> at pmc.ops:130
> #31 0x407cd83c in runops_slow_core (interp=0x81b7bf8, pc=0x40c981b0)
> at src/runops_cores.c:222
> #32 0x4079edb9 in runops_int (interp=0x81b7bf8, offset=2101)
> at src/interpreter.c:938
> #33 0x4079f65f in runops (interp=0x81b7bf8, offs=2101) at
> src/inter_run.c:101
> #34 0x4079f904 in runops_args (interp=0x81b7bf8, sub=0x82e17f8,
> obj=0x82c8028,
> meth_unused=0x0, sig=0x4043b4d5 "IP",
> ap=0xbffff7ec
> "\2242\b-\btz,\b<-\bt\027.\b\0...@h\027zc@{\033\b\001#\...@x\2242\b`<\bho\223\...@-\b\2242\b0\2252\b(")
> at src/inter_run.c:236
> #35 0x4079fe56 in Parrot_runops_fromc_arglist_reti (interp=0x81b7bf8,
> sub=0x82e17f8, sig=0x4043b4d5 "IP",
> args=0xbffff7ec
> "\2242\b-\btz,\b<-\bt\027.\b\0...@h\027zc@{\033\b\001#\...@x\2242\b`<\bho\223\...@-\b\2242\b0\2252\b(")
> at src/inter_run.c:527
> #36 0x4078995c in Parrot_call_sub_ret_int (interp=0x81b7bf8,
> sub=0x82e17f8,
> signature=0x4043b4d5 "IP") at src/extend.c:929
> #37 0x4043834b in modparrot_call_sub_IP (interp=0x81b7bf8,
> namespace=0x82301d0 "PIR", name=0x4043af49
> "post_read_request_handler",
> ret=0xbffff878, pmc=0x83294a4) at src/parrot_util.c:167
> #38 0x40435a17 in modparrot_call_meta_handler (interp=0x81b7bf8,
> hll=0x82301d0 "PIR", hook=0x4043af49 "post_read_request_handler",
> ret=0xbffff878) at src/mod_parrot.c:233
> #39 0x40435e91 in modparrot_meta_post_read_request_handler (r=0x83cab60)
> at src/mod_parrot.c:382
New description:
changes in r32203 cause mod_parrot to segfault, as the param signature is
an uninitialized string. specifically, the pcc_params_signature NCI
attribute is null. not sure if this corresponds to a specific parrot
test...
creating the signature as a constant string appears to cause this problem,
as removing PObj_constant_FLAG from src/pmc/nci.pmc:82 "fixes" the issue,
though that's most certainly not a solution.
chromatic thinks we need more COW: "My theory is that the JIT STRING
conversion needs a Parrot_make_COW_reference."
tewk has a workaround: "short-term comment tools/build/nativecall.pl:308
to disable jitted NCI"
backtrace is included, now with more stack smashing!
{{{
Program received signal SIGSEGV, Segmentation fault.
0x40798304 in Parrot_init_arg_sig (interp_unused=0x81b7bf8, ctx=0x832fd78,
sig=0x0, ap=0x0, sti=0xbffff398) at src/inter_call.c:422
422 if (*sig) {
(gdb) bt
#0 0x40798304 in Parrot_init_arg_sig (interp_unused=0x81b7bf8,
ctx=0x832fd78,
sig=0x0, ap=0x0, sti=0xbffff398) at src/inter_call.c:422
#1 0x40797f6c in Parrot_init_arg_nci (interp=0x81b7bf8, st=0xbffff36c,
sig=0x0) at src/inter_call.c:276
#2 0x082f6451 in ?? ()
#3 0x081b7bf8 in ?? ()
#4 0xbffff36c in ?? ()
#5 0x00000000 in ?? ()
#6 0x08193458 in ?? ()
#7 0x08310418 in ?? ()
#8 0x00000200 in ?? ()
#9 0x40cdd2d8 in ?? ()
#10 0x082dda10 in ?? ()
#11 0x0832fd78 in ?? ()
#12 0x00000001 in ?? ()
#13 0x00000000 in ?? ()
#14 0x00000000 in ?? ()
#15 0x00000000 in ?? ()
#16 0x00000000 in ?? ()
#17 0x081b7bf8 in ?? ()
#18 0x08193458 in ?? ()
#19 0x00000100 in ?? ()
#20 0x407a0bc3 in key_next (interp=0x81b7bf8, key=0x82e1f4c) at
src/key.c:480
#21 0x40938a6e in Parrot_NCI_invoke (interp=0x81b7bf8, pmc=0x82e1f4c,
next=0x40cdd2ec) at nci.pmc:303
#22 0x40717116 in Parrot_invokecc_p (cur_opcode=0x40cdd2e4,
interp=0x81b7bf8)
at core.ops:475
#23 0x407cd83c in runops_slow_core (interp=0x81b7bf8, pc=0x40cdd2e4)
at src/runops_cores.c:222
#24 0x4079edb9 in runops_int (interp=0x81b7bf8, offset=80)
at src/interpreter.c:938
#25 0x4079f65f in runops (interp=0x81b7bf8, offs=80) at
src/inter_run.c:101
#26 0x4079f904 in runops_args (interp=0x81b7bf8, sub=0x82dd7fc,
obj=0x8328fd4,
meth_unused=0x826cc5c, sig=0x40ad50e5 "v", ap=0xbffff594 "\2172\b")
at src/inter_run.c:236
#27 0x4079fc96 in Parrot_run_meth_fromc_args (interp=0x81b7bf8,
sub=0x82dd7fc,
obj=0x8328fd4, meth=0x826cc5c, sig=0x40ad50e5 "v") at
src/inter_run.c:426
#28 0x409a9042 in initialize_parents (interp=0x81b7bf8, object=0x8328fd4,
all_parents=0x8329108) at class.pmc:344
#29 0x409aaf7c in Parrot_Class_instantiate (interp=0x81b7bf8,
pmc=0x832923c,
init=0x82c8028) at class.pmc:1131
#30 0x40736446 in Parrot_new_p_pc (cur_opcode=0x40c981b0,
interp=0x81b7bf8)
at pmc.ops:130
#31 0x407cd83c in runops_slow_core (interp=0x81b7bf8, pc=0x40c981b0)
at src/runops_cores.c:222
#32 0x4079edb9 in runops_int (interp=0x81b7bf8, offset=2101)
at src/interpreter.c:938
#33 0x4079f65f in runops (interp=0x81b7bf8, offs=2101) at
src/inter_run.c:101
#34 0x4079f904 in runops_args (interp=0x81b7bf8, sub=0x82e17f8,
obj=0x82c8028,
meth_unused=0x0, sig=0x4043b4d5 "IP",
ap=0xbffff7ec
"\2242\b-\btz,\b<-\bt\027.\b\0...@h\027zc@{\033\b\001#\...@x\2242\b`<\bho\223\...@-\b\2242\b0\2252\b(")
at src/inter_run.c:236
#35 0x4079fe56 in Parrot_runops_fromc_arglist_reti (interp=0x81b7bf8,
sub=0x82e17f8, sig=0x4043b4d5 "IP",
args=0xbffff7ec
"\2242\b-\btz,\b<-\bt\027.\b\0...@h\027zc@{\033\b\001#\...@x\2242\b`<\bho\223\...@-\b\2242\b0\2252\b(")
at src/inter_run.c:527
#36 0x4078995c in Parrot_call_sub_ret_int (interp=0x81b7bf8,
sub=0x82e17f8,
signature=0x4043b4d5 "IP") at src/extend.c:929
#37 0x4043834b in modparrot_call_sub_IP (interp=0x81b7bf8,
namespace=0x82301d0 "PIR", name=0x4043af49
"post_read_request_handler",
ret=0xbffff878, pmc=0x83294a4) at src/parrot_util.c:167
#38 0x40435a17 in modparrot_call_meta_handler (interp=0x81b7bf8,
hll=0x82301d0 "PIR", hook=0x4043af49 "post_read_request_handler",
ret=0xbffff878) at src/mod_parrot.c:233
#39 0x40435e91 in modparrot_meta_post_read_request_handler (r=0x83cab60)
at src/mod_parrot.c:382
}}}
--
--
Ticket URL: <https://trac.parrot.org/parrot/ticket/1173#comment:2>
Parrot <https://trac.parrot.org/parrot/>
Parrot Development
_______________________________________________
parrot-tickets mailing list
[email protected]
http://lists.parrot.org/mailman/listinfo/parrot-tickets
