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.
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