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It is normal under certain weirdo stack configurations when debugging embedded interrupts and such that GDB fails to be able to single step. The solution is to use "resume" or "step" until the app has left the screwed up stack state. Even if CDT fails to run "stack-info-depth", "Resume" and "Step" should still be available as valid choice. Øyvind
Created attachment 18318 [details] "Step" should also be available as well as "Resume" It would be best to let GDB decide whether or not it can "step" in this case.
*** Bug 92574 has been marked as a duplicate of this bug. ***
Deferred.
Reassigning to the pool.
Future means you commit to fix it in the Future. Inboxes can't make committments. Moving to '--'.
Created attachment 80316 [details] Patch to return a default stack size in case of an error while getting "stack-info-depth" In some circumstances the stack size can't be read. In this case eclipse can't continue debugging. If we return a default stack size of 1, eclipse is still working perfectly. We use this fix at SIEMENS and it's working fine. Greedings, Alexander Wunschik, SIEMENS AG
(In reply to comment #6) > Created an attachment (id=80316) [details] > Patch to return a default stack size in case of an error while getting > "stack-info-depth" > > In some circumstances the stack size can't be read. In this case eclipse can't > continue debugging. > If we return a default stack size of 1, eclipse is still working perfectly. > We use this fix at SIEMENS and it's working fine. > > Greedings, > Alexander Wunschik, SIEMENS AG Thanks!!!!!! Any reason why this isn't applied?
What does -stack-list-frames in this situation?
(In reply to comment #8) > What does -stack-list-frames in this situation? > 2332-stack-list-locals 0 Cannot access memory at address 0xdeadbeeb 2332^done,locals=[name="p2",name="start",name="end",name="p",name="len"]
(In reply to comment #8) > What does -stack-list-frames in this situation? Good thing you asked. How does CDT interpret such out of band messages? As an error message?
Note that "info stack" works even if "stack-list-frames" fails. (gdb) 148-stack-list-frames &"Cannot access memory at address 0xdeadbeeb\n" 148^error,msg="Cannot access memory at address 0xdeadbeeb" (gdb) Cannot access memory at address 0xdeadbeeb info stack 149-interpreter-exec console "info stack" ~"#0 zylinjtag_Jim_Command_poke (interp=0x341b0, argc=3, argv=0x23fb294) at /cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c:854\n" #0 zylinjtag_Jim_Command_poke (interp=0x341b0, argc=3, argv=0x23fb294) at /cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c:854 ~"#1 0x0210312c in Jim_EvalObj (interp=0x341b0, scriptObjPtr=0x3d210) at /tmp/ecosboard/packages/net/athttpd/current/src/jim.c:8270\n" #1 0x0210312c in Jim_EvalObj (interp=0x341b0, scriptObjPtr=0x3d210) at /tmp/ecosboard/packages/net/athttpd/current/src/jim.c:8270 ~"#2 0x02105270 in Jim_EvalFile (interp=0x341b0, filename=0x3b288 \"/ram/cgi/index.tcl\") at /tmp/ecosboard/packages/net/athttpd/current/src/jim.c:8495\n" #2 0x02105270 in Jim_EvalFile (interp=0x341b0, filename=0x3b288 "/ram/cgi/index.tcl") at /tmp/ecosboard/packages/net/athttpd/current/src/jim.c:8495 ~"#3 0x021176d4 in Jim_SourceCoreCommand (interp=0x341b0, argc=3, argv=0x23fb1fc) at /tmp/ecosboard/packages/net/athttpd/current/src/jim.c:11455\n" #3 0x021176d4 in Jim_SourceCoreCommand (interp=0x341b0, argc=3, argv=0x23fb1fc) at /tmp/ecosboard/packages/net/athttpd/current/src/jim.c:11455 ~"#4 0x0210312c in Jim_EvalObj (interp=0x341b0, scriptObjPtr=0x34350) at /tmp/ecosboard/packages/net/athttpd/current/src/jim.c:8270\n" #4 0x0210312c in Jim_EvalObj (interp=0x341b0, scriptObjPtr=0x34350) at /tmp/ecosboard/packages/net/athttpd/current/src/jim.c:8270 ~"#5 0x02105860 in Jim_Eval (interp=0x341b0, script=0x3 \"\\336\\030\\360\\237\\345\\030\\360\\237\\345\\030\\360\\237\\345\\030\\360\\237\\345\") at /tmp/ecosboard/packages/net/athttpd/current/src/jim.c:8418\n" #5 0x02105860 in Jim_Eval (interp=0x341b0, script=0x3 "\336\030\360\237\345\030\360\237\345\030\360\237\345\030\360\237\345") at /tmp/ecosboard/packages/net/athttpd/current/src/jim.c:8418 ~"#6 0x020f417c in cyg_httpd_exec_cgi () at /tmp/ecosboard/packages/net/athttpd/current/src/cgi.c:267\n" #6 0x020f417c in cyg_httpd_exec_cgi () at /tmp/ecosboard/packages/net/athttpd/current/src/cgi.c:267 ~"#7 0x02133528 in cyg_httpd_process_method () at /tmp/ecosboard/packages/net/athttpd/current/src/http.c:718\n" #7 0x02133528 in cyg_httpd_process_method () at /tmp/ecosboard/packages/net/athttpd/current/src/http.c:718 ~"#8 0x020f2d84 in cyg_httpd_daemon (data=213424) at /tmp/ecosboard/packages/net/athttpd/current/src/socket.c:268\n" #8 0x020f2d84 in cyg_httpd_daemon (data=213424) at /tmp/ecosboard/packages/net/athttpd/current/src/socket.c:268 ~"#9 0x00006c94 in Cyg_HardwareThread::thread_entry (thread=0x23fa11c) at /tmp/ecosboard/packages/kernel/current/src/common/thread.cxx:95\n" #9 0x00006c94 in Cyg_HardwareThread::thread_entry (thread=0x23fa11c) at /tmp/ecosboard/packages/kernel/current/src/common/thread.cxx:95 ~"#10 0x00006c60 in Cyg_Thread::exit () at /ecos-c/cygwin/tmp/ecosboard/ecos/install/include/cyg/kernel/sched.hxx:397\n" #10 0x00006c60 in Cyg_Thread::exit () at /ecos-c/cygwin/tmp/ecosboard/ecos/install/include/cyg/kernel/sched.hxx:397 &"Cannot access memory at address 0xdeadbeeb\n" 149^done Cannot access memory at address 0xdeadbeeb (gdb)
This apparently is a bug in GDB that has been fixed. http://sourceware.org/ml/gdb-patches/2006-08/msg00166.html I'm going to test w/GDB from CVS HEAD...
The problem still exists in GDB CVS HEAD: 6.7.50.20071227-cvs 663-gdb-set confirm off 663^done 664-gdb-set width 0 (gdb) 664^done (gdb) 665-gdb-set height 0 665^done (gdb) 666-interpreter-exec console echo 666^done 667-gdb-show prompt (gdb) (gdb) 669 info threads &"info threads\n" &"No registers.\n" 669^error,msg="No registers." (gdb) 670-data-list-register-names 670^done,register-names=["r0","r1","r2","r3","r4","r5","r6","r7","r8","r9","r10","r11","r12","sp","lr","pc","f0","f1","f2","f3","f4","f5","f6","f7","fps","cpsr","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","",""] (gdb) 671-break-insert cyg_assert_fail &"Function \"cyg_assert_fail\" not defined.\n" 671^error,msg="unknown error" (gdb) 672-break-insert _memcpy Function "cyg_assert_fail" not defined. 672^done,bkpt={number="1",type="breakpoint",disp="keep",enabled="y",addr="0x0001e440",func="_memcpy",file="/tmp/ecosboard/packages/infra/current/src/memcpy.c",fullname="/tmp/ecosboard/packages/infra/current/src/memcpy.c",line="94",times="0"} (gdb) 673-break-disable 1 673^done,bkpt={number="1",type="breakpoint",disp="keep",enabled="n",addr="0x0001e440",func="_memcpy",file="/tmp/ecosboard/packages/infra/current/src/memcpy.c",fullname="/tmp/ecosboard/packages/infra/current/src/memcpy.c",line="94",times="0"} (gdb) 674-break-insert main 674^done,bkpt={number="2",type="breakpoint",disp="keep",enabled="y",addr="0x0202db98",func="main",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",line="1271",times="0"} (gdb) 675-break-insert malloc 675^done,bkpt={number="3",type="breakpoint",disp="keep",enabled="y",addr="0x020bbf00",func="malloc",file="/ecos-c/cygwin/tmp/ecosboard/ecos/install/include/cyg/hal/fastmem.inl",fullname="/ecos-c/cygwin/tmp/ecosboard/ecos/install/include/cyg/hal/fastmem.inl",line="175",times="0"} (gdb) 676-break-disable 3 676^done,bkpt={number="3",type="breakpoint",disp="keep",enabled="n",addr="0x020bbf00",func="malloc",file="/ecos-c/cygwin/tmp/ecosboard/ecos/install/include/cyg/hal/fastmem.inl",fullname="/ecos-c/cygwin/tmp/ecosboard/ecos/install/include/cyg/hal/fastmem.inl",line="175",times="0"} 677-break-insert tftp_client.c:0 (gdb) &"No line 0 in file \"/tmp/ecosboard/packages/net/common/current/src/tftp_client.c\".\n" 677^error,msg="No line 0 in file \"/tmp/ecosboard/packages/net/common/current/src/tftp_client.c\"." (gdb) No line 0 in file "/tmp/ecosboard/packages/net/common/current/src/tftp_client.c". 678-break-insert _memset 678^done,bkpt={number="4",type="breakpoint",disp="keep",enabled="y",addr="0x00011410",func="_memset",file="/tmp/ecosboard/packages/infra/current/src/memset.c",fullname="/tmp/ecosboard/packages/infra/current/src/memset.c",line="85",times="0"} (gdb) 679-break-disable 4 679^done,bkpt={number="4",type="breakpoint",disp="keep",enabled="n",addr="0x00011410",func="_memset",file="/tmp/ecosboard/packages/infra/current/src/memset.c",fullname="/tmp/ecosboard/packages/infra/current/src/memset.c",line="85",times="0"} (gdb) 680 show version &"show version\n" ~"GNU gdb 6.7.50.20071227-cvs\n" GNU gdb 6.7.50.20071227-cvs ~"Copyright (C) 2007 Free Software Foundation, Inc.\n" Copyright (C) 2007 Free Software Foundation, Inc. show version ~"License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law. Type \"show copying\"\nand \"show warranty\" for details.\n" License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. ~"This GDB was configured as \"--host=i686-pc-cygwin --target=arm-elf\".\n" This GDB was configured as "--host=i686-pc-cygwin --target=arm-elf". 680^done (gdb) 681 set remotetimeout 100 &"set remotetimeout 100\n" 681^done (gdb) set remotetimeout 100 682 set remote memory-write-packet-size fixed &"set remote memory-write-packet-size fixed\n" set remote memory-write-packet-size fixed 682^done (gdb) 683 set remote memory-write-packet-size 8192 &"set remote memory-write-packet-size 8192\n" set remote memory-write-packet-size 8192 683^done (gdb) 684 target remote 10.0.0.66:3333 &"target remote 10.0.0.66:3333\n" target remote 10.0.0.66:3333 ~"0x00000018 in ?? ()\n" 0x00000018 in ?? () 684^done (gdb) 685 monitor reg cpsr 0x000000D3 &"monitor reg cpsr 0x000000D3\n" monitor reg cpsr 0x000000D3 @"cpsr (/32): 0x000000d3\n" cpsr (/32): 0x000000d3 685^done (gdb) 686 monitor mww 0xFFE00000 0x0100273D &"monitor mww 0xFFE00000 0x0100273D\n" monitor mww 0xFFE00000 0x0100273D 686^done (gdb) 687 monitor mww 0xFFE00004 0x08002125 &"monitor mww 0xFFE00004 0x08002125\n" monitor mww 0xFFE00004 0x08002125 687^done (gdb) 688 monitor mww 0xFFEe0008 0x02002125 &"monitor mww 0xFFEe0008 0x02002125\n" monitor mww 0xFFEe0008 0x02002125 688^done (gdb) 689 monitor mww 0xFFE0000c 0x03002125 &"monitor mww 0xFFE0000c 0x03002125\n" monitor mww 0xFFE0000c 0x03002125 689^done (gdb) 690 monitor mww 0xFFE00010 0x40000000 &"monitor mww 0xFFE00010 0x40000000\n" monitor mww 0xFFE00010 0x40000000 690^done (gdb) 691 monitor mww 0xFFE00014 0x50000000 monitor mww 0xFFE00014 0x50000000 &"monitor mww 0xFFE00014 0x50000000\n" 691^done (gdb) 692 monitor mww 0xFFE00018 0x60000000 &"monitor mww 0xFFE00018 0x60000000\n" monitor mww 0xFFE00018 0x60000000 692^done (gdb) 693 monitor mww 0xFFE0001c 0x70000000 monitor mww 0xFFE0001c 0x70000000 &"monitor mww 0xFFE0001c 0x70000000\n" 693^done (gdb) 694 monitor mww 0xFFE00020 0x00000001 monitor mww 0xFFE00020 0x00000001 &"monitor mww 0xFFE00020 0x00000001\n" 694^done (gdb) 695 monitor mww 0xFFE00024 0x00000000 &"monitor mww 0xFFE00024 0x00000000\n" monitor mww 0xFFE00024 0x00000000 695^done (gdb) 696 monitor mww 0xFFFFF124 0xFFFFFFFF &"monitor mww 0xFFFFF124 0xFFFFFFFF\n" monitor mww 0xFFFFF124 0xFFFFFFFF 696^done (gdb) 697 monitor mww 0 0xdeadbabe &"monitor mww 0 0xdeadbabe\n" monitor mww 0 0xdeadbabe 697^done (gdb) 698 monitor mdw 0 &"monitor mdw 0\n" monitor mdw 0 @"0x00000000: deadbabe \n" 0x00000000: deadbabe 698^done (gdb) 699 monitor mdw 0x1000000 monitor mdw 0x1000000 &"monitor mdw 0x1000000\n" @"0x01000000: ea00000e \n" 0x01000000: ea00000e 699^done (gdb) 700 load &"load\n" load ~"Loading section .rom_vectors, size 0x40 lma 0x2000000\n" Loading section .rom_vectors, size 0x40 lma 0x2000000 678+download,{section=".rom_vectors",section-size="64",total-size="7384881"} ~"Loading section .fastdata, size 0x2a860 lma 0x2000040\n" Loading section .fastdata, size 0x2a860 lma 0x2000040 678+download,{section=".fastdata",section-size="174176",total-size="7384881"} 678+download,{section=".fastdata",section-sent="40720",section-size="174176",total-sent="40784",total-size="7384881"} 678+download,{section=".fastdata",section-sent="81424",section-size="174176",total-sent="81488",total-size="7384881"} 678+download,{section=".fastdata",section-sent="122048",section-size="174176",total-sent="122112",total-size="7384881"} 678+download,{section=".fastdata",section-sent="162736",section-size="174176",total-sent="162800",total-size="7384881"} ~"Loading section .text, size 0x1177a4 lma 0x202a8a0\n" Loading section .text, size 0x1177a4 lma 0x202a8a0 678+download,{section=".text",section-size="1144740",total-size="7384881"} 678+download,{section=".text",section-sent="24336",section-size="1144740",total-sent="198576",total-size="7384881"} 678+download,{section=".text",section-sent="64736",section-size="1144740",total-sent="238976",total-size="7384881"} 678+download,{section=".text",section-sent="105312",section-size="1144740",total-sent="279552",total-size="7384881"} 678+download,{section=".text",section-sent="145808",section-size="1144740",total-sent="320048",total-size="7384881"} 678+download,{section=".text",section-sent="186368",section-size="1144740",total-sent="360608",total-size="7384881"} 678+download,{section=".text",section-sent="226912",section-size="1144740",total-sent="401152",total-size="7384881"} 678+download,{section=".text",section-sent="267488",section-size="1144740",total-sent="441728",total-size="7384881"} 678+download,{section=".text",section-sent="307936",section-size="1144740",total-sent="482176",total-size="7384881"} 678+download,{section=".text",section-sent="348320",section-size="1144740",total-sent="522560",total-size="7384881"} 678+download,{section=".text",section-sent="388832",section-size="1144740",total-sent="563072",total-size="7384881"} 678+download,{section=".text",section-sent="429360",section-size="1144740",total-sent="603600",total-size="7384881"} 678+download,{section=".text",section-sent="469824",section-size="1144740",total-sent="644064",total-size="7384881"} 678+download,{section=".text",section-sent="510352",section-size="1144740",total-sent="684592",total-size="7384881"} 678+download,{section=".text",section-sent="550944",section-size="1144740",total-sent="725184",total-size="7384881"} 678+download,{section=".text",section-sent="591664",section-size="1144740",total-sent="765904",total-size="7384881"} 678+download,{section=".text",section-sent="632368",section-size="1144740",total-sent="806608",total-size="7384881"} 678+download,{section=".text",section-sent="673088",section-size="1144740",total-sent="847328",total-size="7384881"} 678+download,{section=".text",section-sent="713824",section-size="1144740",total-sent="888064",total-size="7384881"} 678+download,{section=".text",section-sent="754512",section-size="1144740",total-sent="928752",total-size="7384881"} 678+download,{section=".text",section-sent="795200",section-size="1144740",total-sent="969440",total-size="7384881"} 678+download,{section=".text",section-sent="835920",section-size="1144740",total-sent="1010160",total-size="7384881"} 678+download,{section=".text",section-sent="876608",section-size="1144740",total-sent="1050848",total-size="7384881"} 678+download,{section=".text",section-sent="917312",section-size="1144740",total-sent="1091552",total-size="7384881"} 678+download,{section=".text",section-sent="957984",section-size="1144740",total-sent="1132224",total-size="7384881"} 678+download,{section=".text",section-sent="998736",section-size="1144740",total-sent="1172976",total-size="7384881"} 678+download,{section=".text",section-sent="1039440",section-size="1144740",total-sent="1213680",total-size="7384881"} 678+download,{section=".text",section-sent="1080128",section-size="1144740",total-sent="1254368",total-size="7384881"} 678+download,{section=".text",section-sent="1120800",section-size="1144740",total-sent="1295040",total-size="7384881"} ~"Loading section .rodata, size 0x32c34 lma 0x2142044\n" Loading section .rodata, size 0x32c34 lma 0x2142044 678+download,{section=".rodata",section-size="207924",total-size="7384881"} 678+download,{section=".rodata",section-sent="16300",section-size="207924",total-sent="1335280",total-size="7384881"} 678+download,{section=".rodata",section-sent="57004",section-size="207924",total-sent="1375984",total-size="7384881"} 678+download,{section=".rodata",section-sent="97500",section-size="207924",total-sent="1416480",total-size="7384881"} 678+download,{section=".rodata",section-sent="138284",section-size="207924",total-sent="1457264",total-size="7384881"} 678+download,{section=".rodata",section-sent="179084",section-size="207924",total-sent="1498064",total-size="7384881"} ~"Loading section .data, size 0x4e14 lma 0x2174c78\n" Loading section .data, size 0x4e14 lma 0x2174c78 678+download,{section=".data",section-size="19988",total-size="7384881"} 678+download,{section=".data",section-sent="8136",section-size="19988",total-sent="1535040",total-size="7384881"} ~"Start address 0x202a8a0, load size 1546892\n" Start address 0x202a8a0, load size 1546892 ~"Transfer rate: 69 KB/sec, 8014 bytes/write.\n" Transfer rate: 69 KB/sec, 8014 bytes/write. 700^done (gdb) monitor reg pc 0x02000000 701 monitor reg pc 0x02000000 &"monitor reg pc 0x02000000\n" @"pc (/32): 0x02000000\n" pc (/32): 0x02000000 701^done (gdb) 702 monitor arm7_9 force_hw_bkpts disable monitor arm7_9 force_hw_bkpts disable &"monitor arm7_9 force_hw_bkpts disable\n" @"force hardware breakpoints disabled\n" force hardware breakpoints disabled 702^done (gdb) 703 monitor arm7_9 sw_bkpts enable &"monitor arm7_9 sw_bkpts enable\n" monitor arm7_9 sw_bkpts enable @"software breakpoints enabled\n" software breakpoints enabled 703^done (gdb) 704 stepi stepi &"stepi\n" ~"0x0202a8a0 in reset_vector ()\n" 0x0202a8a0 in reset_vector () 704^done (gdb) 705 info proc &"info proc\n" &"Undefined info command: \"proc\". Try \"help info\".\n" 705^error,msg="Undefined info command: \"proc\". Try \"help info\"." (gdb) 706 info program &"info program\n" ~"Debugging a target over a serial line.\n" ~"Program stopped at 0x202a8a0.\n" ~"It stopped after being stepped.\n" ~"Type \"info stack\" or \"info registers\" for more information.\n" 706^done (gdb) 707 info threads &"info threads\n" &"warning: RMT ERROR : failed to get remote thread list.\n" 707^done (gdb) 708-stack-list-frames 708^done,stack=[frame={level="0",addr="0x0202a8a0",func="reset_vector"}] (gdb) 709-stack-info-depth 709^done,depth="1" (gdb) 710-stack-list-frames 0 1 710^done,stack=[frame={level="0",addr="0x0202a8a0",func="reset_vector"}] (gdb) 711-data-list-changed-registers 711^done,changed-registers=["0","1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25"] (gdb) 712-stack-list-arguments 0 0 0 712^done,stack-args=[frame={level="0",args=[]}] (gdb) 713-stack-list-locals 0 713^done,locals=[name="bit_reverse_table256"] (gdb) 714-var-create - * bit_reverse_table256 714^done,name="var1",numchild="256",value="[256]",type="const unsigned char [256]" (gdb) 715-var-create - * &(bit_reverse_table256) 715^done,name="var2",numchild="1",value="0x2163530",type="const unsigned char (*)[256]" (gdb) 716-var-set-format var2 hexadecimal 716^done,format="hexadecimal" (gdb) 717-var-evaluate-expression var2 717^done,value="0x2163530" (gdb) 718-exec-continue 718^running (gdb) 718*stopped,reason="breakpoint-hit",bkptno="2",thread-id="0",frame={addr="0x0202db98",func="main",args=[{name="argc",value="1"},{name="argv",value="0x23d8c"}],file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",line="1271"} (gdb) 719 info threads &"info threads\n" &"warning: RMT ERROR : failed to get remote thread list.\n" 719^done (gdb) 720-stack-info-depth 720^done,depth="1" (gdb) 721-stack-list-frames 0 1 721^done,stack=[frame={level="0",addr="0x0202db98",func="main",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",line="1271"}] (gdb) 722-var-update var1 722^done,changelist=[] (gdb) 723-var-update var2 723^done,changelist=[] (gdb) 724-data-list-changed-registers 724^done,changed-registers=["1","2","3","4","5","7","11","12","13","14","15","25"] (gdb) 725-stack-list-arguments 0 0 0 725^done,stack-args=[frame={level="0",args=[name="argc",name="argv"]}] (gdb) 726-stack-list-locals 0 726^done,locals=[name="cfg_cmd_ctx",name="err",name="address",name="errVal",name="__FUNCTION__",name="retval"] (gdb) 727-var-create - * argc 727^done,name="var3",numchild="0",value="1",type="int" (gdb) 728-var-evaluate-expression var3 728^done,value="1" 729-var-create - * argv (gdb) 729^done,name="var4",numchild="1",value="0x23d8c",type="char **" (gdb) 730-var-create - * cfg_cmd_ctx 731-var-evaluate-expression var4 730^done,name="var5",numchild="6",value="0xdeadbeef",type="command_context_t *" (gdb) 731^done,value="0x23d8c" (gdb) 732 ptype command_context_t * &"ptype command_context_t *\n" ~"type = struct command_context_s {\n" ~" enum command_mode mode;\n" ~" struct command_s *commands;\n" ~" int current_target;\n" ~" int echo;\n" ~" int (*output_handler)(struct command_context_s *, char *);\n" ~" void *output_handler_priv;\n" ~"} *\n" 732^done (gdb) 733-var-create - * err 734-var-evaluate-expression var5 733^done,name="var6",numchild="0",value="-559038737",type="int" (gdb) 734^done,value="0xdeadbeef" (gdb) 735-var-create - * address 736-var-evaluate-expression var6 735^done,name="var7",numchild="16",value="[16]",type="char [16]" (gdb) 736^done,value="-559038737" (gdb) 737-var-create - * &(address) 737^done,name="var8",numchild="1",value="0x23d5c",type="char (*)[16]" (gdb) 738-var-set-format var8 hexadecimal 738^done,format="hexadecimal" (gdb) 739-var-evaluate-expression var8 739^done,value="0x23d5c" (gdb) 740-var-create - * errVal 740^done,name="var9",numchild="0",value="-559038737",type="int" (gdb) 741-var-evaluate-expression var9 741^done,value="-559038737" (gdb) 742-var-create - * __FUNCTION__ 742^done,name="var10",numchild="5",value="[5]",type="const char [5]" (gdb) 743-var-create - * &(__FUNCTION__) 743^done,name="var11",numchild="1",value="0x21574d4",type="const char (*)[5]" (gdb) 744-var-set-format var11 hexadecimal 744^done,format="hexadecimal" (gdb) 745-var-evaluate-expression var11 745^done,value="0x21574d4" (gdb) 746-exec-continue 746^running (gdb) ~"Current language: auto; currently c++\n" Current language: auto; currently c++ 746*stopped,reason="signal-received",signal-name="SIGINT",signal-meaning="Interrupt",thread-id="0",frame={addr="0x020c46e8",func="__strncmp",args=[{name="s1",value="0x2 \"\\255\\336\\030\\360\\237\\345\\030\\360\\237\\345\\030\\360\\237\\345\\030\\360\\237\\345\""},{name="s2",value="0x246fc70 \"script\""},{name="n",value="3"}],file="/tmp/ecosboard/packages/language/c/libc/string/current/src/strncmp.cxx",fullname="/tmp/ecosboard/packages/language/c/libc/string/current/src/strncmp.cxx",line="163"} (gdb) 747 info threads &"info threads\n" &"warning: RMT ERROR : failed to get remote thread list.\n" 747^done (gdb) 748-stack-info-depth 748^done,depth="7" (gdb) 749-stack-list-frames 0 7 749^done,stack=[frame={level="0",addr="0x020c46e8",func="__strncmp",file="/tmp/ecosboard/packages/language/c/libc/string/current/src/strncmp.cxx",fullname="/tmp/ecosboard/packages/language/c/libc/string/current/src/strncmp.cxx",line="163"},frame={level="1",addr="0x0207c86c",func="build_unique_lengths",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/helper/command.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/helper/command.c",line="62"},frame={level="2",addr="0x0207cb2c",func="register_command",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/helper/command.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/helper/command.c",line="131"},frame={level="3",addr="0x02032810",func="target_register_user_commands",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/target/target.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/target/target.c",line="927"},frame={level="4",addr="0x02030ab8",func="target_init",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/target/target.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/target/target.c",line="357"},frame={level="5",addr="0x0202aa00",func="launchTarget",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",line="131"},frame={level="6",addr="0x0202e260",func="main",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",line="1410"}] (gdb) 750-var-update var1 750^done,changelist=[] (gdb) 751-var-update var2 751^done,changelist=[] (gdb) 752-data-list-changed-registers 752^done,changed-registers=["0","1","2","3","4","11","12","13","14","15","25"] (gdb) 753 info signal SIGINT &"info signal SIGINT\n" ~"Signal Stop\tPrint\tPass to program\tDescription\n" ~"SIGINT Yes\tYes\tNo\t\tInterrupt\n" 753^done (gdb) 754-stack-list-arguments 0 0 0 754^done,stack-args=[frame={level="0",args=[name="s1",name="s2",name="n"]}] (gdb) 755-stack-list-locals 0 755^done,locals=[name="aligned_s1",name="aligned_s2"] (gdb) 756-var-create - * s1 756^done,name="var12",numchild="1",value="0x2 \"\\255\\336\\030\\360\\237\\345\\030\\360\\237\\345\\030\\360\\237\\345\\030\\360\\237\\345\"",type="const char *" (gdb) 757-var-evaluate-expression var12 757^done,value="0x2 \"\\255\\336\\030\\360\\237\\345\\030\\360\\237\\345\\030\\360\\237\\345\\030\\360\\237\\345\"" (gdb) 758-var-create - * s2 758^done,name="var13",numchild="1",value="0x246fc70 \"script\"",type="const char *" (gdb) 759-var-create - * n 760-var-evaluate-expression var13 759^done,name="var14",numchild="0",value="3",type="size_t" (gdb) 760^done,value="0x246fc70 \"script\"" (gdb) 761 ptype size_t &"ptype size_t\n" ~"type = long unsigned int\n" 761^done (gdb) 762-var-create - * aligned_s1 763-var-evaluate-expression var14 762^done,name="var15",numchild="1",value="0x246fa80",type="const CYG_WORD *" (gdb) 763^done,value="3" (gdb) 764 ptype const CYG_WORD * &"ptype const CYG_WORD *\n" ~"type = unsigned int *\n" 764^done (gdb) 765-var-create - * aligned_s2 766-var-evaluate-expression var15 765^done,name="var16",numchild="1",value="0x246fc70",type="const CYG_WORD *" (gdb) 766^done,value="0x246fa80" (gdb) 767-var-evaluate-expression var16 767^done,value="0x246fc70" (gdb) 768-exec-continue 768^running (gdb) 768*stopped,reason="signal-received",signal-name="SIGINT",signal-meaning="Interrupt",thread-id="0",frame={addr="0x020c46e0",func="__strncmp",args=[{name="s1",value="0x2 \"\\255\\336\\030\\360\\237\\345\\030\\360\\237\\345\\030\\360\\237\\345\\030\\360\\237\\345\""},{name="s2",value="0x24baa40 \"mdb\""},{name="n",value="3"}],file="/tmp/ecosboard/packages/language/c/libc/string/current/src/strncmp.cxx",fullname="/tmp/ecosboard/packages/language/c/libc/string/current/src/strncmp.cxx",line="151"} (gdb) 769 info threads &"info threads\n" &"warning: RMT ERROR : failed to get remote thread list.\n" 769^done (gdb) 770-stack-info-depth 770^done,depth="6" (gdb) 771-stack-list-frames 0 6 771^done,stack=[frame={level="0",addr="0x020c46e0",func="__strncmp",file="/tmp/ecosboard/packages/language/c/libc/string/current/src/strncmp.cxx",fullname="/tmp/ecosboard/packages/language/c/libc/string/current/src/strncmp.cxx",line="151"},frame={level="1",addr="0x0207c86c",func="build_unique_lengths",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/helper/command.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/helper/command.c",line="62"},frame={level="2",addr="0x0207cb2c",func="register_command",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/helper/command.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/helper/command.c",line="131"},frame={level="3",addr="0x02087608",func="ocd_flash_init",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/flash/flash.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/flash/flash.c",line="117"},frame={level="4",addr="0x0202aa54",func="launchTarget",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",line="136"},frame={level="5",addr="0x0202e260",func="main",file="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",fullname="/cygdrive/c/workspace/ecosboard/ecosboard/phi/openocd/rep/src/zylinjtag.c",line="1410"}] (gdb) 772-var-update var1 772^done,changelist=[] (gdb) 773-var-update var2 773^done,changelist=[] (gdb) 774-var-update var12 774^done,changelist=[{name="var12",in_scope="false"}] (gdb) 775-var-delete var12 775^done,ndeleted="1" (gdb) 776-var-update var13 776^done,changelist=[{name="var13",in_scope="false"}] (gdb) 777-var-delete var13 777^done,ndeleted="1" (gdb) 778-var-update var14 778^done,changelist=[{name="var14",in_scope="false"}] (gdb) 779-var-delete var14 779^done,ndeleted="1" (gdb) 780-var-update var15 780^done,changelist=[{name="var15",in_scope="false"}] (gdb) 781-var-delete var15 781^done,ndeleted="1" (gdb) 782-var-update var16 782^done,changelist=[{name="var16",in_scope="false"}] (gdb) 783-var-delete var16 783^done,ndeleted="1" (gdb) 784-data-list-changed-registers 784^done,changed-registers=["0","1","3","4","11","13","14","15"] (gdb) 785-stack-list-arguments 0 0 0 785^done,stack-args=[frame={level="0",args=[name="s1",name="s2",name="n"]}] (gdb) 786-stack-list-locals 0 786^done,locals=[name="aligned_s1",name="aligned_s2"] (gdb) 787-var-create - * s1 788-exec-continue 787^done,name="var17",numchild="1",value="0x2 \"\\255\\336\\030\\360\\237\\345\\030\\360\\237\\345\\030\\360\\237\\345\\030\\360\\237\\345\"",type="const char *" (gdb) 788^running (gdb) 788*stopped,reason="signal-received",signal-name="SIGINT",signal-meaning="Interrupt",thread-id="0",frame={addr="0x00000018",func="??",args=[]} (gdb) 789 info threads &"info threads\n" &"warning: RMT ERROR : failed to get remote thread list.\n" 789^done (gdb) 790-stack-info-depth &"Cannot access memory at address 0xdeadbeeb\n" 790^error,msg="Cannot access memory at address 0xdeadbeeb" 791-stack-info-depth Cannot access memory at address 0xdeadbeeb (gdb) Cannot access memory at address 0xdeadbeeb &"Cannot access memory at address 0xdeadbeeb\n" 791^error,msg="Cannot access memory at address 0xdeadbeeb" (gdb) info stack 792-interpreter-exec console "info stack" ~"#0 0x00000018 in ?? ()\n" #0 0x00000018 in ?? () ~"#1 0x000088d0 in Cyg_Thread::exit () at /ecos-c/cygwin/tmp/ecosboard/ecos/install/include/cyg/kernel/sched.hxx:397\n" #1 0x000088d0 in Cyg_Thread::exit () at /ecos-c/cygwin/tmp/ecosboard/ecos/install/include/cyg/kernel/sched.hxx:397 &"Cannot access memory at address 0xdeadbeeb\n" Cannot access memory at address 0xdeadbeeb 792^done (gdb)
Here is the culprit: "info stack" works, but "stack-info-depth" fails... 790-stack-info-depth &"Cannot access memory at address 0xdeadbeeb\n" 790^error,msg="Cannot access memory at address 0xdeadbeeb" 791-stack-info-depth Cannot access memory at address 0xdeadbeeb (gdb) Cannot access memory at address 0xdeadbeeb &"Cannot access memory at address 0xdeadbeeb\n" 791^error,msg="Cannot access memory at address 0xdeadbeeb" (gdb) info stack 792-interpreter-exec console "info stack" ~"#0 0x00000018 in ?? ()\n" #0 0x00000018 in ?? () ~"#1 0x000088d0 in Cyg_Thread::exit () at /ecos-c/cygwin/tmp/ecosboard/ecos/install/include/cyg/kernel/sched.hxx:397\n" #1 0x000088d0 in Cyg_Thread::exit () at /ecos-c/cygwin/tmp/ecosboard/ecos/install/include/cyg/kernel/sched.hxx:397 &"Cannot access memory at address 0xdeadbeeb\n" Cannot access memory at address 0xdeadbeeb 792^done (gdb)
Created attachment 94325 [details] Putting the stack frame problem to rest GDB has a known bug where it fails to evaluate the stack frame if stack frame evaluation accesses invalid memory(which can *easily* happen w/-O3). This is a known problem with GDB. The attached patch adds a workaround for Eclipse. Please apply and close this bug report as "this is now resolved as far as Eclipse can contribute to the problem".
(In reply to comment #15) Your patch removes the finally clause. Is there a special reason for that?
(In reply to comment #16) > (In reply to comment #15) > > Your patch removes the finally clause. Is there a special reason for that? That was unintentional, I'll attach an updated patch. Actually this fix is no longer needed for my own purposes(I'm using OpenOCD and it has a different way of tackling the workaround), but this covers *other* hardware debuggers and also cases not covered by OpenOCD(that I haven't encountered yet).
Created attachment 94333 [details] Put finally clause back in
Reproducing this problem/exercising the code path is pretty awkward as it requires a hardware debugger and an embedded target where stack evaluation happens to touch memory that generates a data abort and this data abort has to be propagated by the hardware debugger. To exercise the code path I recommend modifying the Thread.java code temporarily.
I don't think it is a right fix. What if MIException is "target timout" of something else? Do you know what exact exception is thrown when gdb cannot indentify stacktrace?
(In reply to comment #20) > I don't think it is a right fix. What if MIException is "target timout" of > something else? Do you know what exact exception is thrown when gdb cannot > indentify stacktrace? > I have no idea what sort of exception CDT might throw when encountering the error below. From a testing point of view, this is a workaround for a bug in GDB afterall, I'm not sure I'd want to have a very complicated codepath in this case. If all other commands except stack-info-depth succeeds, then *probably* we're looking at this problem. 790-stack-info-depth &"Cannot access memory at address 0xdeadbeeb\n" 790^error,msg="Cannot access memory at address 0xdeadbeeb" 791-stack-info-depth Cannot access memory at address 0xdeadbeeb (gdb)
ok.. it would not be worse than before... In a first attempt to recover it does not check exception type either
Patch applied to HEAD with minor modifications.
Fixed in 5.0 > 20080403.
