ruby-dev

In article <e0b1e5700801160813l7d753489n1a53c847068bd917@mail.gmail.com>,
  "Yusuke ENDOH" <mame@tsg.ne.jp> writes:

> rb_big_mul や divrem は rb_thread_blocking_region の中で実行されますが、
> その中でオブジェクトを生成するため、GC が GVL をロックしない状態で発生
> する (下手をすると GC が並列に動作する) 可能性があるような気がしました。
>
> 他人事のように言ってますが、rb_thread_blocking_region で実行するように
> 提案してパッチを書いたのは私です ([ruby-dev:32632]) 。ごめんなさい。
>
> 危なそうな例でも落ちたことはないので実は問題ないのかもしれません。でも
> 少し怖いので、オブジェクトの生成を rb_thread_blocking_region の外で行う
> パッチを書いてみました。ご検討ください。

今日、以下のように rb_thread_blocking_region 中に GC が発生
したときに SEGV が起こるのに出会ったんですが、この問題ってど
ういう話になったんでしたっけ?

...
test_convert(TestBignum): .
test_div(TestBignum): .
test_divmod(TestBignum): .
test_divrem(TestBignum): .
test_eq(TestBignum): .
test_eql(TestBignum): .
test_even(TestBignum): .
test_hash(TestBignum): .
test_int2inum(TestBignum): .
test_interrupt(TestBignum): /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/test/ruby/test_bignum.rb:352: [BUG] Segmentation fault
ruby 1.9.0 (2008-01-28 revision 15288) [i686-linux]

-- control frame ----------
c:0025 p:---- s:0089 b:0089 l:000088 d:000088 CFUNC  :join
c:0024 p:0065 s:0086 b:0086 l:000aa4 d:000aa4 METHOD /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/test/ruby/test_bignum.rb:352
c:0023 p:0008 s:0079 b:0078 l:000eb4 d:000eb4 METHOD /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/test/ruby/test_bignum.rb:357
c:0022 p:0039 s:0075 b:0075 l:000074 d:000074 METHOD /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testcase.rb:76
c:0021 p:0015 s:0070 b:0070 l:000064 d:000069 BLOCK  /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:34
c:0020 p:---- s:0070 b:0070 l:000069 d:000069 FINISH :name
c:0019 p:---- s:0068 b:0068 l:000067 d:000067 CFUNC  :each
c:0018 p:0026 s:0065 b:0065 l:000064 d:000064 METHOD /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:33
c:0017 p:0015 s:0060 b:0060 l:000054 d:000059 BLOCK  /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:34
c:0016 p:---- s:0060 b:0060 l:000059 d:000059 FINISH :concat
c:0015 p:---- s:0058 b:0058 l:000057 d:000057 CFUNC  :each
c:0014 p:0026 s:0055 b:0055 l:000054 d:000054 METHOD /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:33
c:0013 p:0015 s:0050 b:0050 l:000044 d:000049 BLOCK  /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:34
c:0012 p:---- s:0050 b:0050 l:000049 d:000049 FINISH :%
c:0011 p:---- s:0048 b:0048 l:000047 d:000047 CFUNC  :each
c:0010 p:0026 s:0045 b:0045 l:000044 d:000044 METHOD /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:33
c:0009 p:0128 s:0040 b:0040 l:00181c d:00181c METHOD /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/ui/testrunnermediator.rb:46
c:0008 p:0008 s:0031 b:0031 l:000030 d:000030 METHOD /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/ui/console/testrunner.rb:67
c:0007 p:0023 s:0028 b:0028 l:000027 d:000027 METHOD /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/ui/console/testrunner.rb:41
c:0006 p:0026 s:0025 b:0025 l:000024 d:000024 METHOD /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/ui/testrunnerutilities.rb:29
c:0005 p:0052 s:0020 b:0020 l:000019 d:000019 METHOD /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/autorunner.rb:216
c:0004 p:0070 s:0016 b:0016 l:000015 d:000015 METHOD /disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/autorunner.rb:12
c:0003 p:0139 s:0008 b:0007 l:000006 d:000006 TOP    ./test/runner.rb:9
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH :inherited
c:0001 p:0000 s:0002 b:0002 l:000001 d:000001 TOP    <dummy toplevel>:17
---------------------------
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/test/ruby/test_bignum.rb:352:in `interrupt'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/test/ruby/test_bignum.rb:357:in `test_interrupt'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testcase.rb:76:in `run'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:34:in `block in run'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:33:in `each'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:33:in `run'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:34:in `block in run'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:33:in `each'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:33:in `run'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:34:in `block in run'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:33:in `each'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/testsuite.rb:33:in `run'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/ui/testrunnermediator.rb:46:in `run_suite'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/ui/console/testrunner.rb:67:in `start_mediator'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/ui/console/testrunner.rb:41:in `start'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/ui/testrunnerutilities.rb:29:in `run'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/autorunner.rb:216:in `run'"
DBG> : "/disk3/akr/chkbuild-tmp/build/ruby-trunk/20080128T130252/ruby/lib/test/unit/autorunner.rb:12:in `run'"
DBG> : "./test/runner.rb:9:in `<main>'"
-- backtrace of native function call (Use addr2line) --
0x80eaed0
0x81081eb
0x8108222
0x80bb120
0xffffe440
0x8064257
0x80642fd
0x80627be
0x80f98cd
0x80f990e
0x80f99f1
0x80fc6e2
0x80ec53e
0x80fc9d3
0x80fdcc0
0x80faab1
0x80fae6b
0x80fb1b9
0x80fb261
0x80fb2bc
0x80e8f0a
0x80ea15c
0x80e9642
0x80e6388
0x80e7b90
0x80e31c7
0x80e344a
0x80ebdd2
0x80eb2a8
0xb7f7eb63
0xb7ec418a
-------------------------------------------------------
gmake: *** [test-all] Aborted (core dumped)
exit 2

binary: /home/akr/chkbuild/tmp/build/ruby-trunk/20080128T130252/ruby/ruby
core: /home/akr/chkbuild/tmp/build/ruby-trunk/20080128T130252/ruby/core.13203.chkbuild.1

warning: current_sos: Can't read pathname for load map: Input/output error

Using host libthread_db library "/lib/tls/libthread_db.so.1".
Core was generated by `./test/runner.rb test_interrupt(TestBignum)                              '.
Program terminated with signal 6, Aborted.
#0  0xb7e1483b in raise () from /lib/tls/libc.so.6
#0  0xb7e1483b in raise () from /lib/tls/libc.so.6
#1  0xb7e15fa2 in abort () from /lib/tls/libc.so.6
#2  0x08108227 in rb_bug (fmt=0x6 <Address 0x6 out of bounds>) at error.c:226
#3  0x080bb120 in sigsegv (sig=11) at signal.c:540
#4  <signal handler called>
#5  mark_locations_array (x=0xb6bb4000, n=-1671500) at gc.c:745
#6  0x08064257 in mark_current_machine_context (th=0x0) at gc.c:1448
#7  0x080642fd in garbage_collect () at gc.c:1491
#8  0x080627be in ruby_xmalloc (size=54432) at gc.c:246
#9  0x080f98cd in rb_big_realloc (big=3058354540, len=0) at bignum.c:72
#10 0x080f990e in rb_big_resize (big=3058354540, len=13608) at bignum.c:84
#11 0x080f99f1 in bignew_1 (klass=3065192528, len=13608, sign=1) at bignum.c:99
#12 0x080fc6e2 in bigmul1 (ptr=0xb6b322e0) at bignum.c:1465
#13 0x080ec53e in rb_thread_blocking_region (func=0x80fc670 <bigmul1>, 
    data1=0xb6b32050, ubf=0, data2=0x0) at thread.c:714
#14 0x080fc9d3 in rb_big_mul0 (x=3058393440, y=3058393320) at bignum.c:1513
#15 0x080fdcc0 in bigsqr (x=181465152) at bignum.c:1951
#16 0x080faab1 in power_cache_get_power (base=10, n1=157832, m1=0x28b)
    at bignum.c:740
#17 0x080fae6b in big2str_karatsuba (x=3058435740, base=10, 
    ptr=0xb6762008 "+", n1=0, len=315663, hbase=10000, trim=1) at bignum.c:885
#18 0x080fb1b9 in rb_big2str0 (x=3058436400, base=10, trim=1) at bignum.c:930
#19 0x080fb261 in rb_big2str (x=3065192528, base=-1229774768) at bignum.c:943
#20 0x080fb2bc in rb_big_to_s (argc=0, argv=0xb6b32050, x=3065192528)
    at bignum.c:969
#21 0x080e8f0a in call_cfunc (func=0x80fb270 <rb_big_to_s>, recv=3058436400, 
    len=0, argc=0, argv=0xb6b3301c) at vm_insnhelper.c:282
#22 0x080ea15c in vm_call_cfunc (th=0xa826ab0, reg_cfp=0xb6bb2f28, num=0, 
    id=792, recv=3058436400, klass=3084250200, flag=97, mn=0xb7d5ec30, 
    blockptr=0xb6b32050) at vm_insnhelper.c:372
#23 0x080e9642 in vm_call_method (th=0xa826ab0, cfp=0xb6bb2f28, num=0, 
    blockptr=0x0, flag=0, id=792, mn=0x0, recv=3058436400, klass=3084250200)
    at vm_insnhelper.c:504
#24 0x080e6388 in vm_eval (th=0xa826ab0, initial=0) at insns.def:1076
#25 0x080e7b90 in vm_eval_body (th=0xa826ab0) at vm.c:1147
#26 0x080e31c7 in invoke_block (th=0xa826ab0, block=0xa9518b8, 
    self=3083876340, argc=0, argv=0xa9f1a40, blockptr=0xb6b32050) at vm.c:572
#27 0x080e344a in vm_invoke_proc (th=0xa826ab0, proc=0xa9518b8, 
    self=3083876340, argc=0, argv=0xa9f1a40, blockptr=0x0) at vm.c:606
#28 0x080ebdd2 in thread_start_func_2 (th=0xa826ab0, stack_start=0xb6b32050)
    at thread.c:314
#29 0x080eb2a8 in thread_start_func_1 (th_ptr=0xb6b32050)
    at thread_pthread.c:175
#30 0xb7f7eb63 in start_thread () from /lib/tls/libpthread.so.0
#31 0xb7ec418a in clone () from /lib/tls/libc.so.6
gdb status: pid 14575 exit 0
failed(test-all)
-- 
[田中 哲][たなか あきら][Tanaka Akira]

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[#32910] NKF,Kconv — Kazuhiro NISHIYAMA <zn@...>

[#32913] openの"b"とencoding — Kazuhiro NISHIYAMA <zn@...>

[#32922] SEGV by regexp match in while loop — Tanaka Akira <akr@...>

[#32932] extend Tempfile — Tanaka Akira <akr@...>

[#32935] queue and timeout — Tanaka Akira <akr@...>

[#32940] ripper cannot build on win32 — yukimi_sake <yukimi_sake@...>

[#32945] Shift_JIS variants and UTF-16 support — "U.Nakamura" <usa@...>

[#32946] replica と alias の違い(encoding) — KIMURA Koichi <kimura.koichi@...>

[#32957] SEGV by Symbol#match — "Hiroyuki Iwatsuki" <don@...>

[#32970] rb_thread_create()の中でmodule_eval — Kouhei Sutou <kou@...>

[#32979] BOM of UTF-８ — KIMURA Koichi <hogemuta@...>

[#32987] error with open-uri (instance_eval?) — "U.Nakamura" <usa@...>

[#32988] Re: [ruby-cvs:22194] Ruby:r14957 (trunk): * encoding.c (rb_enc_init): UTF-{16,32}{BE,LE} are not builtin. — Yukihiro Matsumoto <matz@...>

[#32992] ASCII is alias of US-ASCII; replica of dummy encoding is not a dummy — "NARUSE, Yui" <naruse@...>

[#32996] binmode and ASCII-8BIT — Kazuhiro NISHIYAMA <zn@...>

[#33058] Time.mktime — Tadayoshi Funaba <tadf@...>

[#33059] time.rb — Tadayoshi Funaba <tadf@...>

[#33060] Shellwords alias bug? — Masahiro Kawato <m-kawato@...>

[#33061] rational 1.18 — Tadayoshi Funaba <tadf@...>

[#33069] Re: [ruby-cvs:22244] Ruby:r15007 (trunk): * enc/make_encdb.rb: added. search enc/*.c and make encoding database. — Yukihiro Matsumoto <matz@...>

[#33072] Segmentation fault when File.open — Jun Mukai <mukai@...>

[#33076] Encoding.compatible? and dummy encodings — sheepman <sheepman@...>

[#33078] NEW REPLICA ENCODINGS AND ENCODING ALIASES — "NARUSE, Yui" <naruse@...>

[#33079] A patch for the manpage and ruby -h — Yugui <yugui@...>

[#33088] IO#gets with limit — sheepman <sheepman@...>

[#33095] Coerce via aliased methods — Yugui <yugui@...>

[#33097] Re: [ruby-cvs:22286] Ruby:r15049 (trunk): * configure.in (setup): add -I$(EXTOUT)/$(arch) to MINIRUBY. — "U.Nakamura" <usa@...>

[#33101] String#valid_encoding? shoud be strict? — Masayoshi Takahashi <maki@...>

[#33111] us_ascii.o: No such file or directory — Martin Duerst <duerst@...>

[#33124] Thread#priority= does not work — "Yusuke ENDOH" <mame@...>

[#33129] uninitialized constant Encoding::ASCII_8BIT (NameError) — Tanaka Akira <akr@...>

[#33130] 1.9.0 をコンパイルしてみた — Shin-ichiro HARA <sinara@...>

[#33136] enc_register_at should use strdup — sheepman <sheepman@...>

[#33139] Bignum#* might invoke GC parallelly? — "Yusuke ENDOH" <mame@...>

[#33142] eval(str.dump)==str — Kazuhiro NISHIYAMA <zn@...>

[#33156] default script encoding and -K option — sheepman <sheepman@...>

[#33159] the encoding of StringIO.new — sheepman <sheepman@...>

[#33164] default encoding for Marshal.load — "Shugo Maeda" <shugo@...>

[#33173] should initialize the group of threads — sheepman <sheepman@...>

[#33185] コンパイルの問題 (r15218) — Martin Duerst <duerst@...>

[#33189] nonlinear performance of each_char — Tanaka Akira <akr@...>

[#33191] Re: [ruby-cvs:22367] Ruby:r15130 (trunk): * enc/koi8_u.c: added. — Tanaka Akira <akr@...>

[#33211] each_char — Tanaka Akira <akr@...>

[#33218] Re: Ruby1.9String バイト列へのインデックス アクセス — "Hisanori Kiryu" <hkiryu@...>

[#33221] encoding of Iconv::Failure#success — Tanaka Akira <akr@...>

[#33224] printf "%0x" — Tanaka Akira <akr@...>

[#33226] [PATCH] warnings of enc/trans/utf_16_32.c — Nobuyoshi Nakada <nobu@...>

[#33231] each_char yields extra NUL — Tanaka Akira <akr@...>

[#33234] SEGV by test/ruby/test_io_m17n.rb — Tanaka Akira <akr@...>

[#33239] Re: [ruby-cvs:22386] Ruby:r15149 (trunk): * string.c (rb_str_each_char): move forward. — Tanaka Akira <akr@...>

[#33247] requests to transcode — "U.Nakamura" <usa@...>

[#33257] Bignum#quo may cause infinite loop — "Yusuke ENDOH" <mame@...>

[#33258] exhaustive test for bignum.c — "Yusuke ENDOH" <mame@...>

[#33261] Local variables in ChangeLog — Kazuhiro NISHIYAMA <zn@...>

[#33264] Marshal.load fails on LANG=ja_JP.EUC-JP — Tanaka Akira <akr@...>

[#33265] backported GC.stress for 1.8 — Tadashi Saito <shiba@...2.accsnet.ne.jp>

[#33273] Re: [ruby-cvs:22404] Ruby:r15167 (trunk): * configure.in (MINIRUBY): remove -I$(EXTOUT)/$(arch) from — Tanaka Akira <akr@...>

[#33275] comment about sprintf %u — "Yusuke ENDOH" <mame@...>

[#33276] comment about Math#asin — "Yusuke ENDOH" <mame@...>

[#33279] ASCII-8BIT regexp — sheepman <sheepman@...>

[#33280] exhaustive tests for struct.c, sprintf.c and math.c — "Yusuke ENDOH" <mame@...>

[#33282] fronzen string cannot unpack("p") — Nobuyoshi Nakada <nobu@...>

[#33303] Time#strftimeのエンコーディング — rubikitch@...

[#33328] can modify array during iteration — "Yusuke ENDOH" <mame@...>

[#33340] Can large scale projects be successful implemented around a dynamic programming language? — Jordi <mumismo@...>

[#33354] Re: [ruby-cvs:22447] Ruby:r15210 (trunk): * io.c (rb_io_getline_fast): the end point of left_char_head() — "U.Nakamura" <usa@...>

[#33359] printf "%#o\n", 0 — Tanaka Akira <akr@...>

[#33363] printf "%.0d\n", 0 — Tanaka Akira <akr@...>

[#33364] rdocのメモリ消費量がやばい — rubikitch@...

[#33367] printf "%#o\n", -1 — Tanaka Akira <akr@...>

[#33368] summary of script encoding — "U.Nakamura" <usa@...>

[#33377] Regexp#sourceのencoding — Kazuhiro NISHIYAMA <zn@...>

[#33380] Re: [ruby-cvs:22481] Ruby:r15244 (trunk): * string.c (rb_str_usascii_new{,2}: defined. — Tanaka Akira <akr@...>

[#33387] HashからStructを作る — rubikitch@...

[#33388] void value expression — SASADA Koichi <ko1@...>

[#33392] Re: [ruby-cvs:22482] Ruby:r15245 (trunk): * compile.c, compile.h: fix stack pointer issues. — Tanaka Akira <akr@...>

[#33399] regexp match /.../n against to UTF-8 string — Tanaka Akira <akr@...>

[#33400] /#{}/e.encoding — Tanaka Akira <akr@...>

[#33401] _dump and encoding with marshal — Tanaka Akira <akr@...>

[#33403] wrapped String#gsub — "Park Ji-In" <tisphie@...>

[#33218] Re: Ruby1.9String 　バイト列へのインデックス　アクセス — "Hisanori Kiryu" <hkiryu@...>