# Another Segmentation Fault problem **URL:** \ **Category:** ruby-talk\ **Created:** [3 August 2002 23:16 UTC](https://rubytalk.org/t/another-segmentation-fault-problem/991 "2002-08-03T23:16:24Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Matt\_Lawrence1](https://avatars.discourse-cdn.com/v4/letter/m/67e7ee/32.png) [@Matt\_Lawrence1](https://rubytalk.org/u/Matt_Lawrence1)\ **Post date:** [3 August 2002 23:16 UTC](https://rubytalk.org/t/another-segmentation-fault-problem/991/1 "2002-08-03T23:16:24Z")
Ok, I’m very new at programming in Ruby, so maybe I missed something. I’ve built a multi-threaded web spider that uses “thread”, "net/http" and “ncurses”. Occasionally it will segfault, usually down in the net code. I’m running Red Hat 7.3 with _all_ the latest updates. The problem seemed to appear after I did an “apt-get dist-upgrade”, but considering how intermittent it is, it might have been there before. Help? – Matt ---
**Author:** ![Yukihiro\_Matsumoto2](https://avatars.discourse-cdn.com/v4/letter/y/b9e5f3/32.png) [@Yukihiro\_Matsumoto2](https://rubytalk.org/u/Yukihiro_Matsumoto2)\ **Post date:** [4 August 2002 09:18 UTC](https://rubytalk.org/t/another-segmentation-fault-problem/991/2 "2002-08-04T09:18:38Z")
Hi, > **···** > > In message “Another Segmentation Fault problem” on 02/08/04, Matt Lawrence [matt@technoronin.com](mailto:matt@technoronin.com) writes: > > > I’ve built a multi-threaded web spider that uses “thread”, “net/http” > > and “ncurses”. Occasionally it will segfault, usually down in the net > > code. I’m running Red Hat 7.3 with _all_ the latest updates. The > > problem seemed to appear after I did an “apt-get dist-upgrade”, but > > considering how intermittent it is, it might have been there before. Help? > > Show me the code if possible. And output from the following command: > > ruby -v > uname -a > > ``` > matz. > > ``` ---
**Author:** ![Brett\_Williams1](https://avatars.discourse-cdn.com/v4/letter/b/7993a0/32.png) [@Brett\_Williams1](https://rubytalk.org/u/Brett_Williams1)\ **Post date:** [6 August 2002 04:00 UTC](https://rubytalk.org/t/another-segmentation-fault-problem/991/3 "2002-08-06T04:00:22Z")
Matt sent me a stack trace here: > Well… how about a stack trace for starters? It’s really hard to help > debug your program with no more information than this. It’s a bit long, but here it is. I’ve never done any real software development on Linux, so I am a bit lost. Thanks for the help. Program received signal SIGSEGV, Segmentation fault. mark\_locations\_array (x=0x401fa380, n=1075755063) at gc.c:354 354 { #0 mark\_locations\_array (x=0x401fa380, n=1075755063) at gc.c:354 x = (VALUE \*) 0x40235000 n = 1075755063 p = (RVALUE \*) 0x0 heap\_org = (RVALUE \*) 0x0 i = 1 #1 0x08066cf1 in rb\_gc\_mark\_frame (frame=0x84cbf14) at gc.c:912 frame = (struct FRAME \*) 0x84cbf14 #2 0x0805f325 in thread\_mark (th=0x8138ae0) at eval.c:7196 th = 0x8138ae0 frame = (struct FRAME \*) 0x84cbf14 block = (struct BLOCK \*) 0x84cbf14 #3 0x08066777 in rb\_gc\_mark (ptr=0x4022d280) at gc.c:634 obj = (RVALUE \*) 0x4022d280 #4 0x08066334 in mark\_locations\_array (x=0x839c250, n=1805) at gc.c:378 x = (VALUE \*) 0x83ab0d0 n = 1805 p = (RVALUE \*) 0x0 heap\_org = (RVALUE \*) 0x0 i = 1 #5 0x0805f2e5 in thread\_mark (th=0x8139048) at eval.c:7188 th = 0x8139048 frame = (struct FRAME \*) 0x4 block = (struct BLOCK \*) 0x4 #6 0x08066777 in rb\_gc\_mark (ptr=0x4022cb14) at gc.c:634 obj = (RVALUE \*) 0x4022cb14 #7 0x080667f3 in rb\_gc\_mark (ptr=0x401ebc7c) at gc.c:667 n = 0 vars = (VALUE \*) 0x8196c18 obj = (RVALUE \*) 0x0 #8 0x08066334 in mark\_locations\_array (x=0x8302218, n=14424) at gc.c:378 x = (VALUE \*) 0x8306bcc n = 14424 p = (RVALUE \*) 0x0 heap\_org = (RVALUE \*) 0x0 i = 1 #9 0x0805f2e5 in thread\_mark (th=0x8137cc0) at eval.c:7188 th = 0x8137cc0 frame = (struct FRAME \*) 0x4 block = (struct BLOCK \*) 0x4 #10 0x08066777 in rb\_gc\_mark (ptr=0x4022e3b0) at gc.c:634 obj = (RVALUE \*) 0x4022e3b0 #11 0x0806672f in rb\_gc\_mark (ptr=0x4022e540) at gc.c:617 i = 1 len = 5 ptr = (VALUE \*) 0x81372a8 obj = (RVALUE \*) 0x81372a8 #12 0x08066334 in mark\_locations\_array (x=0x83b02e8, n=1815) at gc.c:378 x = (VALUE \*) 0x83b4030 n = 1815 p = (RVALUE \*) 0x0 heap\_org = (RVALUE \*) 0x0 i = 1 #13 0x0805f2e5 in thread\_mark (th=0x8138560) at eval.c:7188 th = 0x8138560 frame = (struct FRAME \*) 0x4 block = (struct BLOCK \*) 0x4 #14 0x08066777 in rb\_gc\_mark (ptr=0x4022d71c) at gc.c:634 obj = (RVALUE \*) 0x4022d71c #15 0x080667f3 in rb\_gc\_mark (ptr=0x4020a230) at gc.c:667 n = 0 vars = (VALUE \*) 0x8159290 obj = (RVALUE \*) 0x0 #16 0x0805f263 in thread\_mark (th=0x8283088) at eval.c:7176 th = 0x8283088 frame = (struct FRAME \*) 0x401c1d10 block = (struct BLOCK \*) 0x401c1d10 #17 0x08066777 in rb\_gc\_mark (ptr=0x4020a1e0) at gc.c:634 obj = (RVALUE \*) 0x4020a1e0 #18 0x08066334 in mark\_locations\_array (x=0x8387c28, n=13940) at gc.c:378 x = (VALUE \*) 0x8388e4c n = 13940 p = (RVALUE \*) 0x0 heap\_org = (RVALUE \*) 0x0 i = 1 #19 0x0805f2e5 in thread\_mark (th=0x814b250) at eval.c:7188 th = 0x814b250 frame = (struct FRAME \*) 0x4 block = (struct BLOCK \*) 0x4 #20 0x08066777 in rb\_gc\_mark (ptr=0x4022ef7c) at gc.c:634 obj = (RVALUE \*) 0x4022ef7c #21 0x08066334 in mark\_locations\_array (x=0x8145568, n=5483) at gc.c:378 x = (VALUE \*) 0x8145ca0 n = 5483 p = (RVALUE \*) 0x0 heap\_org = (RVALUE \*) 0x0 i = 1 #22 0x0805f2e5 in thread\_mark (th=0x81452b0) at eval.c:7188 th = 0x81452b0 frame = (struct FRAME \*) 0x4 block = (struct BLOCK \*) 0x4 #23 0x08066777 in rb\_gc\_mark (ptr=0x4022f65c) at gc.c:634 obj = (RVALUE \*) 0x4022f65c #24 0x08066334 in mark\_locations\_array (x=0x82b7070, n=5606) at gc.c:378 x = (VALUE \*) 0x82b75bc n = 5606 p = (RVALUE \*) 0x0 heap\_org = (RVALUE \*) 0x0 i = 1 #25 0x0805f2e5 in thread\_mark (th=0x813f310) at eval.c:7188 th = 0x813f310 frame = (struct FRAME \*) 0x4 block = (struct BLOCK \*) 0x4 #26 0x08066777 in rb\_gc\_mark (ptr=0x4022fabc) at gc.c:634 obj = (RVALUE \*) 0x4022fabc #27 0x080667f3 in rb\_gc\_mark (ptr=0x401cfd34) at gc.c:667 n = 6 vars = (VALUE \*) 0x811d85c obj = (RVALUE \*) 0x6 #28 0x0805ce65 in blk\_mark (data=0x8100688) at eval.c:6108 data = (struct BLOCK \*) 0x8100688 #29 0x08066777 in rb\_gc\_mark (ptr=0x401c1ce8) at gc.c:634 obj = (RVALUE \*) 0x401c1ce8 #30 0x08066386 in mark\_entry (key=8893, value=1075584232) at gc.c:405 No locals. #31 0x0809cbe9 in st\_foreach (table=0x80d8888, func=0x8066378 \, arg=0x0) at st.c:488 table = (st\_table \*) 0x80d8888 ptr = (st\_table\_entry \*) 0x8100738 last = (st\_table\_entry \*) 0x0 tmp = (st\_table\_entry \*) 0xbfff8e70 retval = ST\_CONTINUE i = 5 #32 0x080663a7 in rb\_mark\_tbl (tbl=0x80d8888) at gc.c:414 tbl = (st\_table \*) 0x0 #33 0x0806678b in rb\_gc\_mark (ptr=0x401cfd20) at gc.c:638 obj = (RVALUE \*) 0x401cfd20 #34 0x08066386 in mark\_entry (key=2841, value=1075641632) at gc.c:405 No locals. #35 0x0809cbe9 in st\_foreach (table=0x80d8b48, func=0x8066378 \, arg=0x0) at st.c:488 table = (st\_table \*) 0x80d8b48 ptr = (st\_table\_entry \*) 0x80d8bd8 last = (st\_table\_entry \*) 0x0 tmp = (st\_table\_entry \*) 0x2b retval = ST\_CONTINUE i = 3 #36 0x080663a7 in rb\_mark\_tbl (tbl=0x80d8b48) at gc.c:414 tbl = (st\_table \*) 0x0 #37 0x0806678b in rb\_gc\_mark (ptr=0x401cfce4) at gc.c:638 obj = (RVALUE \*) 0x401cfce4 #38 0x08066707 in rb\_gc\_mark (ptr=0x401cfcd0) at gc.c:606 obj = (RVALUE \*) 0x401cfcd0 #39 0x08066707 in rb\_gc\_mark (ptr=0x401cfcbc) at gc.c:606 obj = (RVALUE \*) 0x401cfcbc #40 0x080666db in rb\_gc\_mark (ptr=0x401cfcf8) at gc.c:601 obj = (RVALUE \*) 0x401cfcf8 #41 0x080666db in rb\_gc\_mark (ptr=0x401c7544) at gc.c:601 obj = (RVALUE \*) 0x401c7544 #42 0x080666db in rb\_gc\_mark (ptr=0x401c7558) at gc.c:601 obj = (RVALUE \*) 0x401c7558 #43 0x080666db in rb\_gc\_mark (ptr=0x401bcf7c) at gc.c:601 obj = (RVALUE \*) 0x401bcf7c #44 0x08066334 in mark\_locations\_array (x=0xbfffa6f0, n=0) at gc.c:378 x = (VALUE \*) 0xbfffa6f0 n = 0 p = (RVALUE \*) 0x0 heap\_org = (RVALUE \*) 0x0 i = 0 #45 0x08066cf1 in rb\_gc\_mark\_frame (frame=0xbfffa630) at gc.c:912 frame = (struct FRAME \*) 0xbfffa630 #46 0x08066d88 in rb\_gc () at gc.c:988 list = (struct gc\_list \*) 0x2856 frame = (struct FRAME \*) 0xbfffa630 save\_regs\_gc\_mark = {{\_\_jmpbuf = {137024000, 80, 1075412896, 1074707334, 137023632, 33554432}, \_\_mask\_was\_saved = 137910144, \_\_saved\_mask = {\_\_val = {0, 137910144, 440, 0, 135291808, 135291792, 0, 135291776, 135291760, 135291744, 135291728, 135291712, 3221201760, 3221197280, 3221197280, 3221197280, 128, 1, 136633902, 2, 136623576, 1, 135290396, 135290396, 6094, 4232, 0, 3221202008, 134831526, 135290320, 136623576, 10326}}}} stack\_end = (VALUE \*) 0xbfffa438 #47 0x0806623c in rb\_newobj () at gc.c:324 No locals. #48 0x0809ccb8 in rb\_str\_new ( ptr=0x824cd7d ’ ’ \, “\\r\n\r\n\r\n\r\n”, ’ ’ \, “\r\n”, ’ ’ \, “\r\n”, ’ ’ \ , “ > \r\n”, ’ ’ \, > “ > > \r\n”, ’ ’ \, “\r\n”, ’ ’ \ , “\r”…, len=41) at string.c:39 > ptr = 0x824cd7d ’ ’ \, “\ class="tableContentMain"\>\r\n\r\n\r\n\r\n”, ’ ’ > \, “\r\n”, ’ ’ \, “\r\n”, ’ ’ \ , “ > \r\n”, ’ ’ \, > “ > > | > | | > > \r\n”, ’ ’ \, “\r\n”, ’ ’ \ , “\r”… > len = 41 > str = (struct RString \*) 0x2856 > #49 0x0809d889 in rb\_str\_substr (str=1075652036, beg=6053, len=41) > at string.c:360 > str = 1075652036 > beg = 0 > len = 41 > str2 = 10326 > #50 0x080a0aae in rb\_str\_split\_m (argc=1, argv=0xbfffa6f0, str=1075652036) > at string.c:2253 > start = 6053 > idx = 1 > last\_null = 0 > regs = (struct re\_registers _) 0x819c150 > argc = 1 > spat = 1075564412 > limit = 4 > char\_sep = -1 > beg = 6053 > end = 41 > i = 0 > lim = 0 > result = 1075453952 > tmp = 0 > #51 0x080594ae in call\_cfunc (func=0x80a07a0 \, > recv=1075652036, len=-1, argc=1, argv=0xbfffa6f0) at eval.c:4257 > func = (VALUE (_)()) 0x80a07a0 \ > recv = 1075652036 > len = 41 > argc = 1 > argv = (VALUE \*) 0x0 > #52 0x08059861 in rb\_call0 (klass=1075633332, recv=1075652036, id=4145, > argc=1, argv=0xbfffa6f0, body=0x401cd5ac, nosuper=1) at eval.c:4394 > \_frame = {self = 1075652036, argc = 1, argv = 0xbfffa6f0, > last\_func = 4145, last\_class = 0, cbase = 1075584272, prev = 0xbfffb8a0, > tmp = 0x0, file = 0x8100fc0 “dma1”, line = 160, iter = 0, flags = 0} > \_iter = {iter = 0, prev = 0xbfffb7c8} > b2 = (NODE \*) 0x401aed3c > result = 4 > itr = -1073764624 > tick = 424221 > #53 0x0805a021 in rb\_call (klass=1075633332, recv=1075652036, mid=4145, > argc=1, argv=0xbfffa6f0, scope=0) at eval.c:4614 > mid = 4145 > scope = 0 > body = (NODE \*) 0x401cd5ac > noex = 1 > id = 4145 > #54 0x08055490 in rb\_eval (self=1075637472, n=0x401bcf40) at eval.c:2544 > n = (NODE \*) 0x0 > node = (NODE \*) 0x401bcf40 > state = 0 > result = 4 > #55 0x08055e0d in rb\_eval (self=1075637472, n=0x401bcf2c) at eval.c:2700 > n = (NODE \*) 0x0 > node = (NODE \*) 0x401bcfa4 > state = 0 > result = 4 > #56 0x08053ba5 in rb\_eval (self=1075637472, n=0x401bdcc4) at eval.c:2025 > n = (NODE \*) 0x0 > node = (NODE \*) 0x401bcf18 > state = 0 > result = 4 > #57 0x08057fa1 in rb\_yield\_0 (val=4, self=1075637472, klass=0, acheck=0) > at eval.c:3622 > \_tag = {buf = {{\_\_jmpbuf = {0, 0, -1073760048, -1073759992, > -1073760352, 134577961}, \_\_mask\_was\_saved = 0, \_\_saved\_mask = { > \_\_val = {3221208904, 4294967295, 608, 0, 3221208920, 3201, 0, > 3221207096, 134583507, 1075987356, 2435342, 0, 0, 0, 1073816024, > 135386248, 3221207568, 3097, 0, 3221207464, 134584417, 134700528, > 1075987356, 1, 1, 3221207568, 1074250064, 3221207176, 134583507, > 0, > 0, 1075946216}}}}, frame = 0xbfffb8a0, iter = 0xbfffb7c8, tag = 0, > retval = 1075713796, scope = 0x4022dac8, dst = 0, prev = 0xbfffc310} > \_iter = {iter = 0, prev = 0xbfffb998} > \_class = 1075641632 > \_old = (struct RVarmap \*) 0x0 > klass = 0 > node = (NODE \*) 0x401bdcc4 > result = 4 > old\_cref = 1075584272 > old\_wrapper = 0 > block = (struct BLOCK \*) 0xbfffc2a0 > old\_scope = (struct SCOPE _) 0x4022dac8 > frame = {self = 1075637472, argc = 1, argv = 0xbfffc65c, > last\_func = 9265, last\_class = 1075641632, cbase = 1075584272, > prev = 0xbfffba70, tmp = 0x0, file = 0x8100fc0 “dma1”, line = 136, iter = > 0, > flags = 0} > file = 0x8100fc0 “dma1” > line = 136 > state = 0 > serial = 1340 > #58 0x08058205 in rb\_f\_loop () at eval.c:3717 > No locals. > #59 0x080594d3 in call\_cfunc (func=0x80581f0 \, recv=1075637472, > len=0, argc=0, argv=0x0) at eval.c:4269 > func = (VALUE (_)()) 0x80581f0 \ > recv = 1075637472 > len = 41 > argc = 0 > argv = (VALUE \*) 0x0 > #60 0x08059861 in rb\_call0 (klass=1075641492, recv=1075637472, id=3681, > argc=0, argv=0x0, body=0x401ce538, nosuper=1) at eval.c:4394 > \_frame = {self = 1075637472, argc = 0, argv = 0x0, last\_func = 3681, > last\_class = 0, cbase = 1075584272, prev = 0xbfffc760, tmp = 0x0, > file = 0x8100fc0 “dma1”, line = 136, iter = 2, flags = 0} > \_iter = {iter = 2, prev = 0xbfffc160} > b2 = (NODE \*) 0x0 > result = 4 > itr = 0 > tick = 424221 > #61 0x0805a021 in rb\_call (klass=1075641492, recv=1075637472, mid=3681, > argc=0, argv=0x0, scope=1) at eval.c:4614 > mid = 3681 > scope = 1 > body = (NODE \*) 0x401ce538 > noex = 3 > id = 3681 > #62 0x08055490 in rb\_eval (self=1075637472, n=0x401b7324) at eval.c:2544 > n = (NODE \*) 0x0 > node = (NODE \*) 0x401b7324 > state = 4 > result = 4 > #63 0x0805453c in rb\_eval (self=1075637472, n=0x401bdea4) at eval.c:2276 > \_iter = {iter = 1, prev = 0xbfffc688} > \_block = {var = 0x0, body = 0x401bdcc4, self = 1075637472, frame = { > self = 1075637472, argc = 1, argv = 0xbfffc65c, last\_func = 9265, > last\_class = 1075641632, cbase = 1075584272, prev = 0xbfffceb0, tmp = > 0x0, > file = 0x8100fc0 “dma1”, line = 136, iter = 0, flags = 0}, > scope = 0x4022dac8, tag = 0x4022da50, klass = 1075641632, iter = 0, > vmode = 0, flags = 1, dyna\_vars = 0x0, orig\_thread = 3221209992, > wrapper = 0, prev = 0x0} > \_tag = {buf = {{\_\_jmpbuf = {1, -1073756272, -1073757476, -1073756616, > -1073758032, 134563053}, \_\_mask\_was\_saved = 0, \_\_saved\_mask = { > \_\_val = {1075108682, 135495680, 1075421964, 3221209960, 1074707334, > 135495680, 36, 0, 3221209824, 1, 1076033656, 1028335257, > 1075421964, > 4096, 1075412896, 3221209992, 1074722436, 4096, 32, 135491080, 22, > 0, 3221212712, 1075412896, 1075421964, 1075412896, 1075412896, > 3221210040, 1074706896, 1075410976, 1075421964, 96}}}}, > frame = 0xbfffc760, iter = 0xbfffc688, tag = 4294967295, retval = 4, > scope = 0x4022dac8, dst = 0, prev = 0xbfffc6a0} > n = (NODE \*) 0x0 > node = (NODE \*) 0x401b7338 > state = 0 > result = 4 > #64 0x08059c7b in rb\_call0 (klass=1075641632, recv=1075637472, id=9265, > argc=0, argv=0xbfffc824, body=0x401bdea4, nosuper=0) at eval.c:4521 > \_tag = {buf = {{\_\_jmpbuf = {1076028716, 9265, 1, -1073756232, > -1073756608, 134584922}, \_\_mask\_was\_saved = 0, \_\_saved\_mask = { > \_\_val = {0, 0, 135271008, 3221210872, 134634967, 8, 135271000, > 135272904, 1, 0, 0, 0, 3221212712, 135474184, 135271008, > 3221210920, > 134898239, 135474184, 135271000, 8, 135271008, 881934, 1075441672, > 0, 135310032, 135272904, 1076033656, 3221210968, 134659348, > 135271000, 135272904, 3221210968}}}}, frame = 0xbfffc760, > iter = 0xbfffc688, tag = 4294967295, retval = 4, scope = 0x4022dac8, > dst = 0, prev = 0xbfffcde0} > \_old = (struct RVarmap \*) 0x4022dadc > \_vmode = 0 > \_old = (struct SCOPE \*) 0x401cfd34 > \_scope = (struct SCOPE \*) 0x0 > state = 0 > local\_vars = (VALUE \*) 0xbfffc654 > saved\_cref = (NODE \*) 0x401c1d10 > \_frame = {self = 1075637472, argc = 1, argv = 0xbfffc65c, > last\_func = 9265, last\_class = 1075641632, cbase = 1075584272, > prev = 0xbfffceb0, tmp = 0x0, file = 0x8100fc0 “dma1”, line = 333, iter = > 0, > flags = 0} > \_iter = {iter = 0, prev = 0xbfffcdd8} > b2 = (NODE \*) 0x401b72d4 > result = 4 > itr = 1 > tick = 424221 > #65 0x0805a021 in rb\_call (klass=1075641632, recv=1075637472, mid=9265, > argc=1, argv=0xbfffc820, scope=1) at eval.c:4614 > mid = 9265 > scope = 1 > body = (NODE \*) 0x4022e52c > noex = 2 > id = 9265 > #66 0x08055490 in rb\_eval (self=1075637472, n=0x401b7090) at eval.c:2544 > n = (NODE \*) 0x0 > node = (NODE \*) 0x401b70a4 > state = 0 > result = 4 > #67 0x08057fa1 in rb\_yield\_0 (val=3, self=1075637472, klass=0, acheck=2) > at eval.c:3622 > \_tag = {buf = {{\_\_jmpbuf = {0, 135496404, 0, -1073754344, -1073754704, > 134577961}, \_\_mask\_was\_saved = 0, \_\_saved\_mask = {\_\_val = > {134578081, > 1075637472, 1075580772, 1076033716, 0, 3221212624, 134574852, > 1075641632, 35, 135270336, 1075580772, 0, 3221213176, 0, 0, > 3221212976, 3221213032, 3221212672, 134577961, 0, 1074710650, 4, > 2, > 3221212808, 5, 16, 24, 1075412896, 1074707334, 1075412896, > 1075412896, 3221212824}}}}, frame = 0xbfffceb0, iter = 0xbfffcdd8, > tag = 0, retval = 4, scope = 0x401cfd34, dst = 0, prev = 0xbfffcf70} > \_iter = {iter = 0, prev = 0xbfffd148} > \_class = 1075641632 > \_old = (struct RVarmap \*) 0x4022dca8 > klass = 0 > node = (NODE \*) 0x401b7090 > result = 4 > old\_cref = 1075584272 > old\_wrapper = 0 > block = (struct BLOCK \*) 0x8138298 > old\_scope = (struct SCOPE \*) 0x401cfd34 > frame = {self = 1075637472, argc = 0, argv = 0x0, last\_func = 0, > last\_class = 0, cbase = 1075584272, prev = 0xbfffd220, tmp = 0x0, > file = 0x8100fc0 “dma1”, line = 333, iter = 0, flags = 0} > file = 0x8100fc0 “dma1” > line = 333 > state = 0 > serial = 1340 > #68 0x0806153f in rb\_thread\_yield (arg=1076026116, th=0x8137fe0) at > eval.c:8452 > arg = 1076026116 > #69 0x080612f5 in rb\_thread\_start\_0 (fn=0x8061514 \, > arg=0x4022db04, th\_arg=0x8137fe0) at eval.c:8385 > \_tag = {buf = {{\_\_jmpbuf = {0, 1, 134616492, -1073753928, -1073754288, > 134615722}, \_\_mask\_was\_saved = 0, \_\_saved\_mask = {\_\_val = > {134556388, > 1075641632, 5637, 0, 3221213568, 6761, 0, 3221214520, 134569970, > 9249, 3221216524, 3221214536, 134570043, 1075584272, 5637, > 1075637472, 3221216524, 0, 1, 3221213192, 1074707334, 4294967295, > 2838798, 0, 3221216456, 0, 1075964656, 2, 3221215168, 3337, 0, > 3221213560}}}}, frame = 0xbfffd220, iter = 0xbfffd148, > tag = 4294967294, retval = 4, scope = 0x401cfd34, dst = 0, prev = > 0xbfffdd40} > th\_arg = 0x0 > th = 0x8137fe0 > thread = 1076026296 > saved\_block = (struct BLOCK _) 0x8138298 > status = THREAD\_RUNNABLE > state = 0 > #70 0x080615ec in rb\_thread\_initialize (thread=1076026296, args=1076026116) > at eval.c:8481 > No locals. > #71 0x080594d3 in call\_cfunc (func=0x80615ac \, > recv=1076026296, len=-2, argc=1, argv=0xbfffd550) at eval.c:4269 > func = (VALUE (_)()) 0x80615ac \ > recv = 1076026296 > len = 41 > argc = 1 > argv = (VALUE \*) 0x0 > #72 0x08059861 in rb\_call0 (klass=1075620672, recv=1076026296, id=2857, > argc=1, argv=0xbfffd550, body=0x401caaf0, nosuper=1) at eval.c:4394 > \_frame = {self = 1076026296, argc = 1, argv = 0xbfffd550, > last\_func = 2857, last\_class = 0, cbase = 1075584272, prev = 0xbfffd490, > tmp = 0x0, file = 0x8100fc0 “dma1”, line = 333, iter = 2, flags = 0} > \_iter = {iter = 2, prev = 0xbfffd300} > b2 = (NODE \*) 0x401ce538 > result = 4 > itr = -1073752752 > tick = 424221 > #73 0x0805a021 in rb\_call (klass=1075620672, recv=1076026296, mid=2857, > argc=1, argv=0xbfffd550, scope=1) at eval.c:4614 > mid = 2857 > scope = 1 > body = (NODE \*) 0x401caaf0 > noex = 3 > id = 2857 > #74 0x0805a2a9 in rb\_funcall2 (recv=1076026296, mid=2857, argc=1, > argv=0xbfffd550) at eval.c:4698 > recv = 0 > #75 0x0805c237 in rb\_obj\_call\_init (obj=1076026296, argc=1, argv=0xbfffd550) > at eval.c:5717 > argc = 1 > argv = (VALUE \*) 0xbfffd550 > \_iter = {iter = 1, prev = 0xbfffd3b8} > #76 0x0806156d in rb\_thread\_s\_new (argc=1, argv=0xbfffd550, > klass=1075620672) > at eval.c:8465 > argc = 1 > argv = (VALUE _) 0xbfffd550 > th = 0x8137fe0 > #77 0x080594ae in call\_cfunc (func=0x8061544 \, > recv=1075620672, len=-1, argc=1, argv=0xbfffd550) at eval.c:4257 > func = (VALUE (_)()) 0x8061544 \ > recv = 1075620672 > len = 41 > argc = 1 > argv = (VALUE \*) 0x0 > #78 0x08059861 in rb\_call0 (klass=1075620652, recv=1075620672, id=3169, > argc=1, argv=0xbfffd550, body=0x401cab18, nosuper=1) at eval.c:4394 > \_frame = {self = 1075620672, argc = 1, argv = 0xbfffd550, > last\_func = 3169, last\_class = 0, cbase = 1075584272, prev = 0xbfffe710, > tmp = 0x0, file = 0x8100fc0 “dma1”, line = 333, iter = 2, flags = 0} > \_iter = {iter = 2, prev = 0xbfffdb90} > b2 = (NODE \*) 0xbfffd400 > result = 4 > itr = -1073752752 > tick = 424221 > #79 0x0805a021 in rb\_call (klass=1075620652, recv=1075620672, mid=3169, > argc=1, argv=0xbfffd550, scope=0) at eval.c:4614 > mid = 3169 > scope = 0 > body = (NODE \*) 0x401cab18 > noex = 1 > id = 3169 > #80 0x08055490 in rb\_eval (self=1075637472, n=0x401b7108) at eval.c:2544 > n = (NODE \*) 0x0 > node = (NODE \*) 0x401b7108 > state = 0 > result = 4 > #81 0x0805453c in rb\_eval (self=1075637472, n=0x401b707c) at eval.c:2276 > \_iter = {iter = 1, prev = 0xbfffe120} > \_block = {var = 0x401b70e0, body = 0x401b7090, self = 1075637472, > frame = {self = 1075637472, argc = 0, argv = 0x0, last\_func = 0, > last\_class = 0, cbase = 1075584272, prev = 0xbfffe910, tmp = 0x0, > file = 0x8100fc0 “dma1”, line = 333, iter = 0, flags = 0}, > scope = 0x401cfd34, tag = 0x4022dc30, klass = 1075641632, iter = 0, > vmode = 0, flags = 1, dyna\_vars = 0x4022dca8, orig\_thread = 3221216584, > wrapper = 0, prev = 0x0} > \_tag = {buf = {{\_\_jmpbuf = {1075540072, -1073748160, -1073750772, > -1073749912, -1073751328, 134563053}, \_\_mask\_was\_saved = 0, > \_\_saved\_mask = {\_\_val = {1074707334, 0, 0, 0, 3221216672, 3221216456, > 0, > 4, 1075641652, 0, 3221216864, 0, 4096, 26, 67108864, 135487624, 0, > 1075637472, 0, 0, 0, 0, 1075584272, 3221217552, 0, 135270336, 46, > 0, > 0, 7300, 134616492, 3221216776}}}}, frame = 0xbfffe710, > iter = 0xbfffe120, tag = 4294967295, retval = 4, scope = 0x401cfd34, > dst = 0, prev = 0xbfffe640} > n = (NODE \*) 0x0 > node = (NODE \*) 0x401b707c > state = 0 > result = 4 > #82 0x0805509a in rb\_eval (self=1075637472, n=0x401b7054) at eval.c:2523 > file = 0x8100fc0 “dma1” > line = 333 > i = 1 > n = (NODE \*) 0x401b7068 > \_iter = {iter = 0, prev = 0xbfffe638} > tmp\_block = (struct BLOCK \*) 0x0 > recv = 1076028736 > argc = 2 > argv = (VALUE \*) 0xbfffe080 > n = (NODE \*) 0x0 > node = (NODE \*) 0x401b7158 > state = 0 > result = 4 > #83 0x08057fa1 in rb\_yield\_0 (val=3, self=1075637472, klass=0, acheck=0) > at eval.c:3622 > \_tag = {buf = {{\_\_jmpbuf = {0, -1073745540, 0, -1073748104, > -1073748464, 134577961}, \_\_mask\_was\_saved = 0, \_\_saved\_mask = { > \_\_val = {1074707334, 3221222608, 3221219008, 3221218984, 134637275, > 131063, 0, 3221218984, 1074707334, 2857, 1073823048, 3221219000, > 134858341, 2857, 4, 135489544, 8, 1076034756, 0, 0, 1075613432, > 1076028736, 0, 0, 2857, 0, 1075584272, 3221219600, 0, 135270336, > 130, 0}}}}, frame = 0xbfffe710, iter = 0xbfffe638, tag = 0, > retval = 4, scope = 0x401cfd34, dst = 0, prev = 0xbffff1b0} > \_iter = {iter = 0, prev = 0xbfffe838} > \_class = 1075641632 > \_old = (struct RVarmap \*) 0x0 > klass = 0 > node = (NODE \*) 0x401b7054 > result = 4 > old\_cref = 1075584272 > old\_wrapper = 0 > block = (struct BLOCK \*) 0xbffff140 > old\_scope = (struct SCOPE _) 0x401cfd34 > frame = {self = 1075637472, argc = 0, argv = 0x0, last\_func = 0, > last\_class = 0, cbase = 1075584272, prev = 0xbfffe910, tmp = 0x0, > file = 0x8100fc0 “dma1”, line = 332, iter = 0, flags = 0} > file = 0x8100fc0 “dma1” > line = 332 > state = 0 > serial = 1340 > #84 0x080581ec in rb\_yield (val=3) at eval.c:3710 > No locals. > #85 0x08089d6a in range\_each (range=1076028456) at range.c:185 > end = 5 > i = 2 > b = 2 > e = 5 > #86 0x080594d3 in call\_cfunc (func=0x8089cf4 \, recv=1076028456, > len=0, argc=0, argv=0x0) at eval.c:4269 > func = (VALUE (_)()) 0x8089cf4 \ > recv = 1076028456 > len = 41 > argc = 0 > argv = (VALUE \*) 0x0 > #87 0x08059861 in rb\_call0 (klass=1075605532, recv=1076028456, id=3569, > argc=0, argv=0x0, body=0x401c6f18, nosuper=1) at eval.c:4394 > \_frame = {self = 1076028456, argc = 0, argv = 0x0, last\_func = 3569, > last\_class = 0, cbase = 1075584272, prev = 0x80c9fe0, tmp = 0x0, > file = 0x8100fc0 “dma1”, line = 332, iter = 2, flags = 0} > \_iter = {iter = 2, prev = 0xbffff000} > b2 = (NODE \*) 0x47 > result = 4 > itr = 0 > tick = 424221 > #88 0x0805a021 in rb\_call (klass=1075605532, recv=1076028456, mid=3569, > argc=0, argv=0x0, scope=0) at eval.c:4614 > mid = 3569 > scope = 0 > body = (NODE \*) 0x401c6f18 > noex = 1 > id = 3569 > #89 0x08055490 in rb\_eval (self=1075637472, n=0x401b71f8) at eval.c:2544 > n = (NODE \*) 0x0 > node = (NODE \*) 0x401b71f8 > state = 0 > result = 4 > #90 0x0805453c in rb\_eval (self=1075637472, n=0x401b7018) at eval.c:2276 > \_iter = {iter = 1, prev = 0xbffffa80} > \_block = {var = 0x401b71bc, body = 0x401b7054, self = 1075637472, > frame = {self = 1075637472, argc = 0, argv = 0x0, last\_func = 0, > last\_class = 0, cbase = 1075584272, prev = 0x0, tmp = 0x0, > file = 0x8100fc0 “dma1”, line = 332, iter = 0, flags = 0}, > scope = 0x401cfd34, tag = 0x4022e504, klass = 1075641632, iter = 0, > vmode = 0, flags = 1, dyna\_vars = 0x0, orig\_thread = 3221221832, > wrapper = 0, prev = 0x0} > \_tag = {buf = {{\_\_jmpbuf = {0, 135045136, -1073745540, -1073744680, > -1073746096, 134563053}, \_\_mask\_was\_saved = 0, \_\_saved\_mask = { > \_\_val = {134637491, 1075542472, 10, 135381336, 135381333, 0, 56, > 1073743934, 1073743288, 1073742360, 1073816024, 6, 1075542352, > 3221223864, 20, 3221221960, 134637275, 1075633332, 4294967295, 0, > 1075108682, 0, 0, 0, 71, 3221222176, 3221222016, 3221222016, > 1075542312, 3221223864, 20, 3221222024}}}}, frame = 0x80c9fe0, > iter = 0xbffffa80, tag = 4294967295, retval = 4, scope = 0x401cfd34, > dst = 0, prev = 0xbffffa90} > n = (NODE \*) 0x0 > node = (NODE \*) 0x401b702c > state = 0 > result = 4 > #91 0x08053ba5 in rb\_eval (self=1075637472, n=0x401c1af4) at eval.c:2025 > n = (NODE \*) 0x0 > node = (NODE \*) 0x401b7004 > state = 9449 > result = 4 > #92 0x08051f91 in ruby\_run () at eval.c:1189 > \_iter = {iter = 0, prev = 0x80ca010} > \_tag = {buf = {{\_\_jmpbuf = {-1073742876, 2, -1073742876, -1073743016, > -1073743248, 134553460}, \_\_mask\_was\_saved = 0, \_\_saved\_mask = { > \_\_val = {1073910936, 1074264752, 1073910936, 4, 134526504, > 1073817708, > 24641422, 24641422, 3221224336, 1073817296, 134532389, 1074706745, > 24, 1074275536, 1073910936, 1074706714, 3221224244, 1073816768, > 1073818560, 29, 3221224252, 1073784033, 1073816768, 1073817296, > 128, > 3221224272, 1073784033, 1073817708, 1073911688, 1, 0, > 1073910936}}}}, frame = 0x80c9fe0, iter = 0x80ca010, tag = 0, > retval = 4, scope = 0x401cfd34, dst = 0, prev = 0x0} > state = 0 > ex = 0 > tmp = (NODE \*) 0x0 > #93 0x0805096f in main (argc=2, argv=0xbffffbe4, envp=0xbffffbf0) at > main.c:50 > argc = 2 > argv = (char \*\*) 0xbffffbe4 > #94 0x4008f1c4 in \_\_libc\_start\_main () from /lib/libc.so.6 > No symbol table info available. > > “Yukihiro Matsumoto” [matz@ruby-lang.org](mailto:matz@ruby-lang.org) wrote in message > news:1028419730.358000.2347.nullmailer@picachu.netlab.jp… > > > Hi, > > > > > I’ve built a multi-threaded web spider that uses “thread”, “net/http” > > > and “ncurses”. Occasionally it will segfault, usually down in the net > > > code. I’m running Red Hat 7.3 with _all_ the latest updates. The > > > problem seemed to appear after I did an “apt-get dist-upgrade”, but > > > considering how intermittent it is, it might have been there before. > > > Help? > > > **···** > > > > On Sun, 4 Aug 2002, Brett Williams wrote: > > > > > In message “Another Segmentation Fault problem” \> on 02/08/04, Matt Lawrence [matt@technoronin.com](mailto:matt@technoronin.com) writes: > > > > > > Show me the code if possible. And output from the following command: > > > > > > ruby -v > > > uname -a > > > > > > matz. > > | > | | ---
**Author:** ![Matt\_Lawrence1](https://avatars.discourse-cdn.com/v4/letter/m/67e7ee/32.png) [@Matt\_Lawrence1](https://rubytalk.org/u/Matt_Lawrence1)\ **Post date:** [6 August 2002 18:21 UTC](https://rubytalk.org/t/another-segmentation-fault-problem/991/4 "2002-08-06T18:21:51Z")
Here’s another bit of information. The program Segfaults much faster on a Pentium 233MMX than it does on a 1.5GHz Athlon XP. I’ve done a couple of hardware checks – both doing multiple kernel builds and running Memtest86 without any problem. Both of these machines are running RedHat 7.3 with all of the latest updates. I’m rather confused as to why it would crash FASTER on a much slower machine. Odd. Any ideas? – Matt ---
**Author:** ![ts1](https://avatars.discourse-cdn.com/v4/letter/t/a8b319/32.png) [@ts1](https://rubytalk.org/u/ts1)\ **Post date:** [7 August 2002 08:11 UTC](https://rubytalk.org/t/another-segmentation-fault-problem/991/5 "2002-08-07T08:11:33Z")
> Here's another bit of information. The program Segfaults much faster on > a Pentium 233MMX than it does on a 1.5GHz Athlon XP. I've done a couple > of hardware checks -- both doing multiple kernel builds and running > Memtest86 without any problem. Both of these machines are running > RedHat 7.3 with all of the latest updates. You have a problem with the GC. Try to reduce your script to a few lines, and invoke manually the GC to try to reproduce the segfault. Guy Decoux