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* [Bug tree-optimization/112358] New: [14 Regression] glibc -Wstringop-overflow= build failure @ 2023-11-02 23:25 jsm28 at gcc dot gnu.org 2023-11-03 8:04 ` [Bug tree-optimization/112358] " rguenth at gcc dot gnu.org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: jsm28 at gcc dot gnu.org @ 2023-11-02 23:25 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112358 Bug ID: 112358 Summary: [14 Regression] glibc -Wstringop-overflow= build failure Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: jsm28 at gcc dot gnu.org CC: rguenth at gcc dot gnu.org Target Milestone: --- Target: hppa-linux-gnu Created attachment 56497 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56497&action=edit preprocessed source Building glibc for hppa-linux-gnu has been failing since 18 September: In file included from ../include/atomic.h:49, from dl-find_object.c:20: In function '_dlfo_update_init_seg', inlined from '_dl_find_object_update_1' at dl-find_object.c:689:30, inlined from '_dl_find_object_update' at dl-find_object.c:805:13: ../sysdeps/unix/sysv/linux/hppa/atomic-machine.h:44:4: error: '__atomic_store_4' writing 4 bytes into a region of size 0 overflows the destination [-Werror=stringop-overflow=] 44 | __atomic_store_n ((mem), (val), __ATOMIC_RELAXED); \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ dl-find_object.c:644:3: note: in expansion of macro 'atomic_store_relaxed' 644 | atomic_store_relaxed (&seg->size, new_seg_size); | ^~~~~~~~~~~~~~~~~~~~ In function '_dl_find_object_update': cc1: note: destination object is likely at address zero Compile the attached test with -O2 -Wall: In function '_dlfo_update_init_seg', inlined from '_dl_find_object_update_1' at dl-find_object.c:689:30, inlined from '_dl_find_object_update' at dl-find_object.c:805:12: dl-find_object.c:644:132: warning: '__atomic_store_4' writing 4 bytes into a region of size 0 overflows the destination [-Wstringop-overflow=] In function '_dl_find_object_update': cc1: note: destination object is likely at address zero I don't know why the compiler thinks "destination object is likely at address zero", so maybe there is actually an issue in the glibc sources, but I didn't see an obvious reason for the warning/error. Introduced by the commit: commit d45ddc2c04e471d0dcee016b6edacc00b8341b16 Author: Richard Biener <rguenther@suse.de> AuthorDate: Thu Sep 14 13:06:51 2023 +0200 Commit: Richard Biener <rguenther@suse.de> CommitDate: Mon Sep 18 10:56:18 2023 +0200 tree-optimization/111294 - backwards threader PHI costing ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/112358] [14 Regression] glibc -Wstringop-overflow= build failure 2023-11-02 23:25 [Bug tree-optimization/112358] New: [14 Regression] glibc -Wstringop-overflow= build failure jsm28 at gcc dot gnu.org @ 2023-11-03 8:04 ` rguenth at gcc dot gnu.org 2024-03-07 21:03 ` law at gcc dot gnu.org 2024-05-07 7:42 ` [Bug tree-optimization/112358] [14/15 " rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2023-11-03 8:04 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112358 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |14.0 Status|UNCONFIRMED |NEW Ever confirmed|0 |1 Last reconfirmed| |2023-11-03 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- I've added cc1: note: destination object is likely at address zero which indicates that we performed some jump threading that exposes a literal NULL pointer we diagnose this on. I see (gdb) p debug_gimple_stmt (exp) # .MEM_230 = VDEF <.MEM_252> __atomic_store_4 (8B, 0, 0); on the path ... <bb 13> [local count: 14148527]: _35 = __atomic_wide_counter_load_relaxed (&_dlfo_loaded_mappings_version); // dl-find_object.c:260:10 _36 = (int) _35; active_idx_37 = _36 & 1; current_seg_38 = _dlfo_loaded_mappings[active_idx_37]; _347 = active_idx_37 ^ 1; pretmp_348 = _dlfo_loaded_mappings[_347]; if (current_seg_38 != 0B) // dl-find_object.c:137:21 goto <bb 84>; [94.50%] else goto <bb 72>; [5.50%] <bb 84> [local count: 13370358]: goto <bb 23>; [100.00%] ... some loop ... <bb 24> [local count: 13370358]: # count_247 = PHI <count_147(93), count_246(95)> remaining_to_add_43 = count_247 + prephitmp_317; // dl-find_object.c:662:10 if (pretmp_348 != 0B) // dl-find_object.c:150:14 goto <bb 96>; [89.00%] else goto <bb 27>; [11.00%] <bb 27> [local count: 1470739]: if (remaining_to_add_43 != 0) // dl-find_object.c:668:8 goto <bb 98>; [47.09%] else goto <bb 35>; [52.91%] <bb 35> [local count: 778169]: __sync_synchronize (); __atomic_store_4 (8B, 0, 0); // [dl-find_object.c:644:132 goto <bb 38>; [100.00%] ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/112358] [14 Regression] glibc -Wstringop-overflow= build failure 2023-11-02 23:25 [Bug tree-optimization/112358] New: [14 Regression] glibc -Wstringop-overflow= build failure jsm28 at gcc dot gnu.org 2023-11-03 8:04 ` [Bug tree-optimization/112358] " rguenth at gcc dot gnu.org @ 2024-03-07 21:03 ` law at gcc dot gnu.org 2024-05-07 7:42 ` [Bug tree-optimization/112358] [14/15 " rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: law at gcc dot gnu.org @ 2024-03-07 21:03 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112358 Jeffrey A. Law <law at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |law at gcc dot gnu.org Priority|P3 |P2 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/112358] [14/15 Regression] glibc -Wstringop-overflow= build failure 2023-11-02 23:25 [Bug tree-optimization/112358] New: [14 Regression] glibc -Wstringop-overflow= build failure jsm28 at gcc dot gnu.org 2023-11-03 8:04 ` [Bug tree-optimization/112358] " rguenth at gcc dot gnu.org 2024-03-07 21:03 ` law at gcc dot gnu.org @ 2024-05-07 7:42 ` rguenth at gcc dot gnu.org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2024-05-07 7:42 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112358 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|14.0 |14.2 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- GCC 14.1 is being released, retargeting bugs to GCC 14.2. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2024-05-07 7:42 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-11-02 23:25 [Bug tree-optimization/112358] New: [14 Regression] glibc -Wstringop-overflow= build failure jsm28 at gcc dot gnu.org 2023-11-03 8:04 ` [Bug tree-optimization/112358] " rguenth at gcc dot gnu.org 2024-03-07 21:03 ` law at gcc dot gnu.org 2024-05-07 7:42 ` [Bug tree-optimization/112358] [14/15 " rguenth at gcc dot gnu.org
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