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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/102769] wrong code at -O1 and above on x86_64-linux-gnu Date: Fri, 15 Oct 2021 09:47:32 +0000 [thread overview] Message-ID: <bug-102769-4-KJHA8B2fYZ@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-102769-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102769 Martin Liška <marxin at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID CC| |marxin at gcc dot gnu.org --- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> --- I think it's invalid code: gcc-11 pr102769.c -g -fsanitize=address,undefined && ./a.out ================================================================= ==27019==ERROR: AddressSanitizer: stack-use-after-scope on address 0x7fffffffdd00 at pc 0x000000400bfd bp 0x7fffffffdcd0 sp 0x7fffffffdcc8 READ of size 4 at 0x7fffffffdd00 thread T0 #0 0x400bfc in main /home/marxin/Programming/testcases/pr102769.c:5 #1 0x7ffff6a7553f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58 #2 0x7ffff6a755eb in __libc_start_main_impl ../csu/libc-start.c:409 #3 0x400a44 in _start (/home/marxin/Programming/testcases/a.out+0x400a44) Address 0x7fffffffdd00 is located in stack of thread T0 at offset 32 in frame #0 0x400b15 in main /home/marxin/Programming/testcases/pr102769.c:2 This frame has 2 object(s): [32, 36) 'h' (line 7) <== Memory access at offset 32 is inside this variable [48, 128) 'g' (line 3) HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork (longjmp and C++ exceptions *are* supported) SUMMARY: AddressSanitizer: stack-use-after-scope /home/marxin/Programming/testcases/pr102769.c:5 in main Shadow bytes around the buggy address: 0x10007fff7b50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7b60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7b70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7b90: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 =>0x10007fff7ba0:[f8]f2 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 0x10007fff7bb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7bc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7bd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7be0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10007fff7bf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb Shadow gap: cc ==27019==ABORTING
next prev parent reply other threads:[~2021-10-15 9:47 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-10-15 9:36 [Bug tree-optimization/102769] New: " zhendong.su at inf dot ethz.ch 2021-10-15 9:47 ` marxin at gcc dot gnu.org [this message] 2021-10-15 10:19 ` [Bug tree-optimization/102769] " zhendong.su at inf dot ethz.ch 2021-10-15 10:23 ` jakub at gcc dot gnu.org 2021-10-15 10:23 ` marxin at gcc dot gnu.org 2021-10-15 10:28 ` zhendong.su at inf dot ethz.ch 2021-10-15 10:33 ` marxin at gcc dot gnu.org 2021-10-15 10:38 ` zhendong.su at inf dot ethz.ch 2021-10-15 10:43 ` marxin at gcc dot gnu.org 2021-10-15 11:39 ` zhendong.su at inf dot ethz.ch 2021-10-15 11:42 ` jakub at gcc dot gnu.org 2021-10-15 15:17 ` zhendong.su at inf dot ethz.ch
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