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Gdb Cannot Insert Breakpoint Cannot Access Memory At Address

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Gdb Break Cannot Access Memory At Address

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Error In Re-setting Breakpoint 1: Cannot Access Memory At Address

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(EST) Cc: openldap-software@OpenLDAP.org In-reply-to: <00e601c3a789$4ef12310$180110ac@kakco> It looks like you've got issues with a null pointer; this is unlikely to be the same issue as gdb cannot access memory at address in the ITS I mentioned. A full backtrace from the 64-bit crash would be useful should you decide to file your own (new) ITS report. On Mon, 10 Nov 2003, Rahul wrote: > Hello Aaron, > > I've the same problem still. > FYI, i have given gdb result(by setting breakpoint in daemon.c) below. > > https://community.hpe.com/t5/General/Error-accessing-memory-address-0x0-Using-wdb-4-0/td-p/3151058 ----------------------------------- > 32 bit - works fine - NO error as below > ============ > > index sn 0x0716 > index ou 0x0716 > bdb_db_open: dc=kt,dc=com > slapd starting > daemon: added 9r > daemon: select: listen=9 active_threads=0 tvp=NULL > daemon: activity on 1 descriptors > daemon: new connection on 13 > [Switching to thread 2 http://www.openldap.org/lists/openldap-software/200311/msg00187.html (system thread 10007)] > > Breakpoint 1, slapd_daemon_task (ptr=0x7af07c50) at daemon.c:1592 > 1592 switch ( from.sa_addr.sa_family ) { > > 64 bit - error as below > ================ > line 60 (rootdn "cn=Manager,dc=kt,dc=com") > line 64 (rootpw ***) > line 68 (directory openldap-data) > line 71 (index cn,sn,ou pres,eq,sub) > index cn 0x0716 > index sn 0x0716 > index ou 0x0716 > bdb_db_open: dc=kt,dc=com > slapd starting > daemon: added 10r > daemon: select: listen=10 active_threads=0 tvp=NULL > daemon: activity on 1 descriptors > daemon: new connection on 14 > [Switching to thread 2 (system thread 9626)] > > Breakpoint 1, slapd_daemon_task (ptr=Error accessing memory address 0x0: > Invalid argument. > ) at daemon.c:1592 > 1592 switch ( from.sa_addr.sa_family ) { > (gdb) q > > -------------------------------------------- > > Any help would be greatly appreciated. > > Thanks and Regards, > -sadha References: Re: Reg: Openldap for 64 bit From: "Rahul" Prev by Date: E-MAIL FALSOS Next by Date: Openldap search result Index(es): Chronological Thread

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more http://stackoverflow.com/questions/7685927/can-not-access-memory-when-accessing-pointer-to-a-struct-gdb-error about Stack Overflow the company Business Learn more about hiring developers or posting ads http://www.nntp.perl.org/group/perl.perl5.porters/2014/06/msg216966.html with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up can not access memory when accessing pointer to a struct GDB error gdb cannot up vote 1 down vote favorite I have run gdb, as my code show segfault. I understand that the code that give the error is 210 if (colour_s->colorlist.colorlist_id == 1) (gdb) print colour_s $1 = (car_colour_list_t_slot *) 0x21 (gdb) print colorlist $2 = (car_colour_list_t *) 0x12d1a80 (gdb) print colour_s->colorlist Cannot access memory at address 0x21 typedef struct { int colorlist_id; } car_colour_list_t; typedef struct _car_colour_list_t_slot { car_colour_list_t colorlist; struct cannot access memory _car_colour_list_t_slot *next, *prev; } car_colour_list_t_slot; car_colour_list_t_slot *colour_s; colour_s = (car_colour_list_t_slot *)malloc(sizeof(car_colour_list_t_slot)); car_colour_list_t *colorlist; colorlist = (car_colour_list_t *)malloc(sizeof(car_colour_list_t)); I have already assigned those pointers memory, but when I tried to print colour_s->colorlist it fails (can not access memory at address 0x21) Can anyone understand why this happens, although I have already assign memory to each poitner? Thank you c gdb share|improve this question asked Oct 7 '11 at 10:20 heike 3691725 You are most certainly overwriting color_s directly or indirectly somewhere else in your code. –Mat Oct 7 '11 at 10:23 I assign it in one function, freed the colour_s pointer, and using socket, this value traverse to other functions (so a lot of things happened with this value). I just need to 'revoke' this value in my function. –heike Oct 7 '11 at 10:26 We can't really guess what you're doing wrong. The lines you show are ok. So your error is elsewhere. –Mat Oct 7 '11 at 10:28 @Mat : the thing is I do not use this colour_s pointer to a struct in my function. It might be used by other function before (which is in remote server, maybe it is not freed or something). Ho

Below is an analysis, but I'm uncertain on how to fix this. Ideas welcome. TL;DR - optimizer-caused, but is the optimizer really to blame? (0) pwd is CPAN/Digest-SHA (1) must compile with the optimizer (+O in HP-UX) - no optimizer, no core dump, and -g (to get the symbols): cc -c -I. -Ae -D_HPUX_SOURCE -Wl,+vnocompatwarnings -DDEBUGGING -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 +O -g -DVERSION=\"5.92\" -DXS_VERSION=\"5.92\" +Z "-I../.." SHA.c (2) make (3) gdb ../../perl == gdb run -I../../lib t/woodbury.t === Starting program: .../perl -I../../lib t/woodbury.t 1..21 ok 1 ok 2 ok 3 ok 4 ok 5 ok 6 ok 7 Program received signal SIGBUS, Bus error si_code: 0 - BUS_UNKNOWN - Unknown Error. 0x7ad9a120 in sha512 (s=warning: reading `' register: Invalid argument 0x2, block=0x7f7f11e0 '6' , "\177\177") at src/sha64bit.c:105 105 a = H[0]; b = H[1]; c = H[2]; d = H[3]; (gdb) === gdb where === #0 0x7ad9a120 in sha512 (s=warning: reading `' register: Invalid argument 0x2, block=0x7f7f11e0 '6' , "\177\177") at src/sha64bit.c:105 #1 0x7ad9a9b8 in shadirect (bitstr=Error accessing memory address 0x4d452e6a: Bad address. ) at src/sha.c:322 #2 0x7ad9aef8 in shawrite (bitstr=0x0, bitcnt=446515, s=Error accessing memory address 0x2e680000: Bad address. ) at src/sha.c:402 #3 0x7ad9b52c in hmacinit (h=0x4a630020, alg=Error accessing memory address 0x74782e63: Bad address. ) at src/sha.c:525 #4 0x7ad9c488 in XS_Digest__SHA_hmac_sha1 (cv=0x0) at SHA.xs:200 #5 0x1d8e38 in Perl_pp_entersub () at pp_hot.c:2794 #6 0x1a26c4 in Perl_runops_debug () at dump.c:2369 #7 0x6562c in S_run_body (oldscope=1) at perl.c:2411 #8 0x64ecc in perl_run (my_perl=0x4003f218) at perl.c:2333 #9 0x2fec0 in main (argc=3, argv=0x7f7f0934, env=0x7f7f0944) at perlmain.c:114 (gdb) === gdb up up up === (gdb) up #1 0x7ad9a9b8 in shadirect (bitstr=Error accessing memory address 0x4d452e6a: Bad address. ) at src/sha.c:322 322 s->sha(s, bitstr); (gdb) #2 0x7ad9aef8 in shawrite (bitstr=0x0, bitcnt=446515, s=Error accessing memory address 0x2e680000: Bad address. ) at src/sha.c:40

 

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