#814: SegFault running CGI script from command line -------------------------------+-------------------------------------------- Reporter: pwilson@… | Owner: lsansonetti@… Type: defect | Status: new Priority: blocker | Milestone: MacRuby 0.7 Component: MacRuby | Keywords: -------------------------------+-------------------------------------------- Old description:

With latest MacRuby nightly (July 27), the following code causes a seg fault if run directly from the command line:

{{{ require 'cgi' c = CGI.new }}}

It works OK when run through the web server. When ruby 1.9 runs this from the command line it asks for data from stdin to serve as query parameters.

Under MacRuby I get this crash:

{{{ (offline mode: enter name=value pairs on standard input) Segmentation fault }}}

and this stack trace:

{{{

Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: 13 at address: 0x0000000000000000 0x000000010005818a in rb_f_open () (gdb) bt #0 0x000000010005818a in rb_f_open () #1 0x000000010005b7cd in rb_io_gets () #2 0x0000000100140a39 in rb_vm_dispatch () #3 0x0000000102f004d0 in ?? () #4 0x0000000102f0c32c in ?? () #5 0x0000000100140996 in rb_vm_dispatch () #6 0x0000000102f004d0 in ?? () #7 0x0000000102f0d319 in ?? () #8 0x0000000100140996 in rb_vm_dispatch () #9 0x0000000102f004d0 in ?? () #10 0x0000000102f0e43f in ?? () #11 0x000000010014097b in rb_vm_dispatch () #12 0x000000010006e342 in rb_class_new_instance_imp () #13 0x0000000100140a39 in rb_vm_dispatch () #14 0x0000000102f004d0 in ?? () #15 0x0000000102f000bd in ?? () #16 0x000000010014d708 in rb_vm_run () #17 0x000000010003fef0 in ruby_run_node () #18 0x0000000100000d28 in main () }}}

New description: With latest MacRuby nightly (July 27), the following code causes a seg fault if run directly from the command line: {{{ #!ruby require 'cgi' c = CGI.new }}} It works OK when run through the web server. When ruby 1.9 runs this from the command line it asks for data from stdin to serve as query parameters. Under MacRuby I get this crash: {{{ (offline mode: enter name=value pairs on standard input) Segmentation fault }}} and this stack trace: {{{ (gdb) bt #0 0x00007fff832c5120 in objc_msgSend () #1 0x0000000100043ff1 in rb_io_read_internal (io_struct=0x101166520, buffer=0x7fff5fbfb5cf "", len=1) at io.c:981 #2 0x000000010004900f in rb_io_gets_m (io=<value temporarily unavailable, due to optimizations>, sel=<value temporarily unavailable, due to optimizations>, argc=<value temporarily unavailable, due to optimizations>, argv=<value temporarily unavailable, due to optimizations>) at io.c:1423 #3 0x000000010004b20c in rb_io_readlines [inlined] () at /Users/naixn/Documents/Projets/MacRuby/io.c:1549 #4 0x000000010004b20c in argf_readlines (argf=<value temporarily unavailable, due to optimizations>, sel=0x101112ac0, argc=0, argv=0x0) at io.c:3422 #5 0x00000001001303c9 in rb_vm_dispatch (_vm=0x100f1e4a0, cache=0x100e78cc0, top=8590007072, self=8590007072, klass=0x2000ca420, sel=0x101112ac0, block=0x0, opt=1 '\001', argc=0, argv=0x0) at dispatcher.cpp:435 #6 0x000000010355a4d0 in ?? () #7 0x000000010356632c in ?? () #8 0x0000000100130326 in rb_vm_dispatch (_vm=0x100f1e4a0, cache=0x100e513c0, top=8590007072, self=8590007072, klass=0x2000ca420, sel=0x105244590, block=0x0, opt=1 '\001', argc=<value temporarily unavailable, due to optimizations>, argv=0x0) at dispatcher.cpp:159 #9 0x000000010355a4d0 in ?? () #10 0x0000000103567319 in ?? () #11 0x0000000100130326 in rb_vm_dispatch (_vm=0x100f1e4a0, cache=0x100e6d8c0, top=8590007072, self=8590007072, klass=0x2000ca420, sel=0x10526ce00, block=0x0, opt=2 '\002', argc=<value temporarily unavailable, due to optimizations>, argv=0x0) at dispatcher.cpp:159 #12 0x000000010355a4d0 in ?? () #13 0x000000010356843f in ?? () #14 0x000000010013030b in rb_vm_dispatch (_vm=0x100f1e4a0, cache=0x100e6bac0, top=0, self=8590007072, klass=0x200217ae0, sel=0x7fff87e4d6b8, block=0x0, opt=2 '\002', argc=<value temporarily unavailable, due to optimizations>, argv=0x7fff5fbfe060) at dispatcher.cpp:161 #15 0x000000010005dd32 in rb_class_new_instance_imp (klass=<value temporarily unavailable, due to optimizations>, sel=<value temporarily unavailable, due to optimizations>, argc=0, argv=0x0) at vm.h:594 #16 0x00000001001303c9 in rb_vm_dispatch (_vm=0x100f1e4a0, cache=0x100e66fc0, top=8590070304, self=8592128736, klass=0x200217aa0, sel=0x7fff87e4d700, block=0x0, opt=0 '\0', argc=0, argv=0x0) at dispatcher.cpp:435 #17 0x000000010355a4d0 in ?? () #18 0x000000010355a0bd in ?? () #19 0x000000010013d108 in rb_vm_run (fname=<value temporarily unavailable, due to optimizations>, node=0x2000ceb40, binding=<value temporarily unavailable, due to optimizations>, inside_eval=false) at vm.cpp:3787 #20 0x000000010002f8b0 in ruby_run_node (n=0x2000ceb40) at eval.c:211 #21 0x0000000100000cf8 in main (argc=2, argv=0x100f1de20, envp=<value temporarily unavailable, due to optimizations>) at main.cpp:40 (gdb) call rb_symbolicate(0x000000010356632c) addr 0x10356632c start 0x103566120 selector read_from_cmdline location /Library/Frameworks/MacRuby.framework/Versions/0.7/usr/lib/ruby/1.9.2/cgi/core.rb:542 (gdb) fr 1 #1 0x0000000100043ff1 in rb_io_read_internal (io_struct=0x101166520, buffer=0x7fff5fbfb5cf "", len=1) at io.c:981 981 if (io_struct->buf == NULL || CFDataGetLength(io_struct->buf) == 0) { Current language: auto; currently c (gdb) p io_struct $1 = (rb_io_t *) 0x101166520 (gdb) po io_struct Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000013 0x00007fff832c52b6 in objc_msgSend_fixup () error on line 266 of "/SourceCache/gdb/gdb-1502/src/gdb/macosx/i386 -macosx-nat-exec.c" in function "store_inferior_registers": (os/kern) invalid argument (0x4) }}} -- Comment(by martinlagardette@…): Modified the stack trace for a more correct interpretation. The crash occurs when `rb_io_read_internal()` calls `CFDataGetLength` on `io_struct->buf`. GDB also whines when trying to `po io_struct`. The IO being read is `ARGF.current_file`, is there a change the corresponding IO struct is not correctly initialized? -- Ticket URL: <http://www.macruby.org/trac/ticket/814#comment:1> MacRuby <http://macruby.org/>

#814: SegFault running CGI script from command line -------------------------------+-------------------------------------------- Reporter: pwilson@… | Owner: lsansonetti@… Type: defect | Status: new Priority: blocker | Milestone: Component: MacRuby | Keywords: -------------------------------+-------------------------------------------- Comment(by lsansonetti@…): Nevermind, my copy of macruby was corrupted. I now get the real crash :-) -- Ticket URL: <http://www.macruby.org/trac/ticket/814#comment:3> MacRuby <http://macruby.org/>

#814: SegFault running CGI script from command line -------------------------------+-------------------------------------------- Reporter: pwilson@… | Owner: lsansonetti@… Type: defect | Status: closed Priority: blocker | Milestone: MacRuby 0.7 Component: MacRuby | Resolution: fixed Keywords: | -------------------------------+-------------------------------------------- Changes (by lsansonetti@…): * status: new => closed * resolution: => fixed * milestone: => MacRuby 0.7 Comment: Fixed in r4398. {{{ (gdb) r Starting program: /usr/local/bin/macruby -r cgi -e p\ CGI.new Reading symbols for shared libraries +++++...................................................... done (offline mode: enter name=value pairs on standard input) foo=bar #<CGI:0x40074b700 @options={:accept_charset=>"UTF-8"} @accept_charset="UTF-8" @multipart=false @params={"foo"=>["bar"]} @cookies={} @output_cookies=nil @output_hidden=nil> Program exited normally. (gdb) ||| -- Ticket URL: <http://www.macruby.org/trac/ticket/814#comment:5> MacRuby <http://macruby.org/>