Gdb Error Accessing Memory Address Invalid Argument
[x] User account creation filtered due to spam. Bug10561 - g77/gdb incorrectly maps variables in fortran common block Summary: g77/gdb incorrectly maps variables in fortran common block Status: RESOLVED INVALID Alias: None Product: gcc Classification: Unclassified Component: debug (show other bugs) Version: 3.2 Importance: P3 normal Target Milestone: --- Assignee: Not yet assigned to anyone URL: Keywords: Depends on: Blocks: Reported: 2003-04-30 05:16 UTC by potterveld Modified: 2005-07-23 22:49 UTC (History) CC List: 1 user (show) gcc-bugs See Also: Host: Target: alpha-dec-osf4.0d Build: Known to work: Known to fail: Last reconfirmed: Attachments Add an attachment (proposed patch, testcase, etc.) Note You need to log in before you can comment on or make changes to this bug. Description potterveld 2003-04-30 05:16:01 UTC gdb can't print variables in common. It appears to try reading a low memory address related to the variable offset in the common, ie, the offset to the start of the common is neglected. Sample program: program xxx common /x/ a,b a = 47 b = 2 end compile with "g77 -g -O0 -o xxx xxx.f" debug with: "gdb xxx" gdb commands: [ Output:] ------------------------------------------------------ break MAIN__ run step step print a [Error accessing memory address 0x8: Invalid argument.] print &a [$1 = (PTR TO -> ( real*4 )) 0x8] print &x_ [$2 = (PTR TO -> ( char (0:7))) 0x1400001d0] print (real) x_ [$3 = 47] Clearly, gdb is aware of variable "a", but has the wrong address for it. Release: gcc: 3.2,3, gdb: 5.3 Environment: HP/Compaq/Dec Alpha, Tru64 unix 4.0f (aka OSF/1) Comment 1 Dara Hazeghi 2004-01-17 23:30:43 UTC Hello, this code works fine for me with gcc 3.3.1 on x86/linux. Would it be possible for you to test with a newer version of gcc (e.g. 3.3.2 or a snapshot of 3.4)? Thanks. Comment 2 Andrew Pinski 2004-04-12 12:51:22 UTC No feedback in 3 months so
question and get tips & solutions from a community of 418,553 IT Pros & Developers. It's quick & easy. Application crash on HP-UX 11.11 P: n/a Thanvir We are currently trying to port a c++ application developed on linux to HP unix 11.11. We have already ported the application successfully on Windows, solaris. We have use the gnu c++ compiler 3.4.3. The compilation was successfull and we created a 64 bit executable but the application crashes immediately when I start https://gcc.gnu.org/bugzilla/show_bug.cgi?id=10561 it(Program received signal SIGSEGV, Segmentation fault. 0x40000000010a8fc4 in ?? ()) Does anybody have any clue of how to trap what is wrong? the gdb stack is as follows. #0 0x40000000010a8fc4 in ?? () warning: Attempting to unwind past bad PC 0x40000000010a8fc4 #1 0x4000000000aca4dc in _GLOBAL__I_.._.._.._.._src_libstdc___v3_src_alloca tor_inst.cc_AAEE1AA9_4FB7074D () at mt_allocator.h:163 #2 0x40000000000a9530 in __do_global_ctors_aux+0x38 () #3 0xc00000000000cca0 in IN_do_list+0x178 () from /usr/lib/pa20_64/dld.sl #4 https://bytes.com/topic/c/answers/139041-application-crash-hp-ux-11-11-a 0xc00000000000f658 in crt_dld_main+0x7e0 () from /usr/lib/pa20_64/dld.sl #5 0xc00000000000a138 in $START$+0x80 () from /usr/lib/pa20_64/dld.sl Error accessing memory address 0x0: Invalid argument Thanks in advance Jul 23 '05 #1 Post Reply Share this Question 4 Replies P: n/a Uenal Mutlu The program seems to accessing a null pointer. Ie. the return value of some memory allocations was omitted. Best you can do is: locate the source location and check whether the requested resource allocation (ie. memory) succeeded, and proceed as necessary... "Thanvir"
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