Is glibc compiled with debug info ? Without a way to see where the problem happens in glibc, this will be difficult to understand. If/when you have glibc debug info, you might use valgrind --vgdb-error=0 and debug glibc startup under valgrind+gdb
Alternatively, you might add -v -v -v -d -d -d to have more information produced by valgrind, but that will likely not help much without glibc debug. In the original mail, you show an extract of the error logs. Was there any other error before ? Because the problem might originate from an earlier error. Finally, do you encounter the same problem with e.g. --tool=none or --tool=callgrind ? (none will do no transformation to the guest process and callgrind will not replace malloc/free, so that might give a hint). Thanks Philippe On Thu, 2025-01-30 at 01:00 +0530, kiran hardas wrote: > Yes Philippe, I did try out Valgrind 3.24, but it too gave same error. > > Regards, > Kiran H. > > On Wed, Jan 29, 2025 at 11:56 PM Philippe Waroquiers > <philippe.waroqui...@skynet.be> > wrote: > > The first thing to try is to compile and use a more recent valgrind version. > > (3.18 is something like 4 years old while 3.24 is from Oct 24). > > > > Thanks > > Philippe > > > > > > On Wed, 2025-01-29 at 19:03 +0530, kiran hardas wrote: > > > Hi Team, > > > > > > Good Evening, > > > > > > I need some support in debugging an issue in Valgrind 3.18. > > > > > > I have an application which I am trying to check with Valgrind tool for > > > memory > > > issues. I > > > have the valgrind source code which is compiled and built along with my > > > application > > > using same set of libraries. But while checking with valgrind tool i get > > > an invalid > > > address error in libc library (mostly implying null pointer > > > dereferencing/free) and > > > valgrind is terminating. I am unable to find the exact place in glibc > > > code where > > > this > > > error is coming from and need any help which you can provide. > > > > > > Please find further details below, > > > > > > $ ./usr/test/bin/valgrind --version -v > > > valgrind-3.18.1-42b08ed5bd-20211015 > > > > > > GNU/Linux 5.4 > > > Glibc 2.40 > > > gcc 14.2 > > > binutils 2.43 > > > > > > This same valgrind was working when i was using glibc 2.23 but giving > > > this error > > > when i > > > upgraded glibc to 2.40 > > > For valgrind 3.18 i have applied rseq patches and nop code error (0x2E > > > 0x8D 0xB4 > > > 0x26) > > > patches also required for latest glibc 2.40. > > > > > > Error log snippet: > > > ------------------------ > > > ... > > > ... > > > ==13089== > > > --13089-- REDIR: 0x1f749f60 (libc.so.6:???) redirected to 0x1e59bd70 > > > (strcmp) > > > ==13089== Jump to the invalid address stated on the next line > > > ==13089== at 0x0: ??? > > > ==13089== by 0x1F607366: ??? (in /lib/libc-2.40.so) > > > ==13089== by 0x1F607423: (below main) (in /lib/libc-2.40.so) > > > ==13089== Address 0x0 is not stack'd, malloc'd or (recently) free'd > > > ==13089== > > > ==13089== > > > ==13089== Process terminating with default action of signal 11 (SIGSEGV): > > > dumping > > > core > > > ==13089== Bad permissions for mapped region at address 0x0 > > > ==13089== at 0x0: ??? > > > ==13089== by 0x1F607366: ??? (in /lib/libc-2.40.so) > > > ==13089== by 0x1F607423: (below main) (in /lib/libc-2.40.so) > > > ==13089== > > > > > > > > > Approaches tried > > > ----------------------- > > > 1. I reduced the optimisation level in glibc to -O1, but still no further > > > symbol > > > details > > > are available > > > 2. The core file generated for valgrind crash is also not showing any > > > symbol details > > > at > > > crash point. (only showing ??) > > > 3. Tried adding more option to valgrind like --track-origins=yes , > > > --read-var- > > > info=yes . > > > But not giving any more info for the error. > > > > > > > > > I would appreciate any pointers team can provide in debugging this issue. > > > > > > Thanks in advance > > > > > > Regards, > > > Kiran H. > > > > > > _______________________________________________ > > > Valgrind-users mailing list > > > Valgrind-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/valgrind-users > > _______________________________________________ Valgrind-users mailing list Valgrind-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/valgrind-users
