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From: "iam at datacompboy dot ru" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug libgcc/106949] New: Memory leak using VLA with -fsplit-stack Date: Thu, 15 Sep 2022 08:18:05 +0000 [thread overview] Message-ID: <bug-106949-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106949 Bug ID: 106949 Summary: Memory leak using VLA with -fsplit-stack Product: gcc Version: 11.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libgcc Assignee: unassigned at gcc dot gnu.org Reporter: iam at datacompboy dot ru Target Milestone: --- Created attachment 53575 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53575&action=edit minimal repro case Having a function with couple of VLA arrays enough to cause a memory leak. If you run the function in a loop, memory leak only grows. ``` $ gcc -fsplit-stack -g b.c && valgrind ./a.out ==6861== HEAP SUMMARY: ==6861== in use at exit: 20,040 bytes in 2 blocks ==6861== total heap usage: 2 allocs, 0 frees, 20,040 bytes allocated ==6861== ==6861== LEAK SUMMARY: ==6861== definitely lost: 24 bytes in 1 blocks ==6861== indirectly lost: 20,016 bytes in 1 blocks ``` With a loop running function 10k times: ``` $ gcc -fsplit-stack -g c.c && valgrind ./a.out ==6931== HEAP SUMMARY: ==6931== in use at exit: 569,801,800 bytes in 32,162 blocks ==6931== total heap usage: 32,162 allocs, 0 frees, 569,801,800 bytes allocated ==6931== ==6931== LEAK SUMMARY: ==6931== definitely lost: 385,944 bytes in 16,081 blocks ==6931== indirectly lost: 569,121,904 bytes in 16,072 blocks ==6931== possibly lost: 293,952 bytes in 9 blocks ```
next reply other threads:[~2022-09-15 8:18 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-09-15 8:18 iam at datacompboy dot ru [this message] 2022-09-15 8:21 ` [Bug libgcc/106949] " iam at datacompboy dot ru 2022-10-03 12:25 ` iam at datacompboy dot ru 2022-10-04 0:22 ` ian at airs dot com 2022-10-04 12:16 ` [Bug libgcc/106949] Memory leak using VLA/alloca " iam at datacompboy dot ru 2022-10-04 15:50 ` iam at datacompboy dot ru
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