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With gdb build with gcc-12 and -fsanitize=thread, and test-case gdb.base/gdb-sigterm.exp, I run into: ... WARNING: ThreadSanitizer: data race (pid=9722)^M Write of size 4 at 0x00000325bc68 by thread T1:^M #0 handle_sigterm(int) src/gdb/event-top.c:1211 (gdb+0x8ec01f)^M ... Previous read of size 4 at 0x00000325bc68 by main thread:^M [failed to restore the stack]^M ^M Location is global 'sync_quit_force_run' of size 4 at \ 0x00000325bc68 (gdb+0x325bc68)^M ... SUMMARY: ThreadSanitizer: data race gdb/event-top.c:1211 in \ handle_sigterm(int)^M ... and 3 more data races involving handle_sigterm and locations: - active_ext_lang - quit_flag - heap block of size 40 (XNEW (async_signal_handler) in create_async_signal_handler) This was reported in PR29297. The testcase executes a "kill -TERM $gdb_pid", which generates a process-directed signal. A process-directed signal can be delivered to any thread, and what we see here is the fallout of the signal being delivered to a worker thread rather than the main thread. Fix this by blocking SIGTERM in the worker threads. [ I have not been able to reproduce this after it occurred for the first time, so unfortunately I cannot confirm that the patch fixes the problem. ] Tested on x86_64-linux, with and without -fsanitize=thread. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29297 |
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| .. | ||
| .dir-locals.el | ||
| .gitattributes | ||
| acinclude.m4 | ||
| aclocal.m4 | ||
| agent.cc | ||
| agent.h | ||
| alt-stack.h | ||
| array-view.h | ||
| ax.def | ||
| block-signals.h | ||
| break-common.h | ||
| btrace-common.cc | ||
| btrace-common.h | ||
| buffer.cc | ||
| buffer.h | ||
| buildargv.h | ||
| byte-vector.h | ||
| ChangeLog-2020-2021 | ||
| check-defines.el | ||
| cleanups.cc | ||
| cleanups.h | ||
| common-debug.cc | ||
| common-debug.h | ||
| common-defs.h | ||
| common-exceptions.cc | ||
| common-exceptions.h | ||
| common-gdbthread.h | ||
| common-inferior.cc | ||
| common-inferior.h | ||
| common-regcache.cc | ||
| common-regcache.h | ||
| common-types.h | ||
| common-utils.cc | ||
| common-utils.h | ||
| common.m4 | ||
| compiler-type.m4 | ||
| config.in | ||
| configure | ||
| configure.ac | ||
| create-version.sh | ||
| def-vector.h | ||
| default-init-alloc.h | ||
| eintr.h | ||
| enum-flags.h | ||
| environ.cc | ||
| environ.h | ||
| errors.cc | ||
| errors.h | ||
| event-loop.cc | ||
| event-loop.h | ||
| event-pipe.cc | ||
| event-pipe.h | ||
| fileio.cc | ||
| fileio.h | ||
| filestuff.cc | ||
| filestuff.h | ||
| filtered-iterator.h | ||
| format.cc | ||
| format.h | ||
| forward-scope-exit.h | ||
| function-view.h | ||
| gdb_assert.h | ||
| gdb_binary_search.h | ||
| gdb_file.h | ||
| gdb_locale.h | ||
| gdb_obstack.cc | ||
| gdb_obstack.h | ||
| gdb_optional.h | ||
| gdb_proc_service.h | ||
| gdb_ref_ptr.h | ||
| gdb_regex.cc | ||
| gdb_regex.h | ||
| gdb_select.h | ||
| gdb_setjmp.h | ||
| gdb_signals.h | ||
| gdb_splay_tree.h | ||
| gdb_string_view.h | ||
| gdb_string_view.tcc | ||
| gdb_sys_time.h | ||
| gdb_tilde_expand.cc | ||
| gdb_tilde_expand.h | ||
| gdb_unique_ptr.h | ||
| gdb_unlinker.h | ||
| gdb_vecs.cc | ||
| gdb_vecs.h | ||
| gdb_wait.cc | ||
| gdb_wait.h | ||
| gdb-dlfcn.cc | ||
| gdb-dlfcn.h | ||
| gdb-hashtab.cc | ||
| gdb-hashtab.h | ||
| gdb-safe-ctype.h | ||
| gdb-sigmask.h | ||
| gdb-xfree.h | ||
| hash_enum.h | ||
| host-defs.h | ||
| intrusive_list.h | ||
| iterator-range.h | ||
| job-control.cc | ||
| job-control.h | ||
| Makefile.am | ||
| Makefile.in | ||
| netstuff.cc | ||
| netstuff.h | ||
| new-op.cc | ||
| next-iterator.h | ||
| observable.h | ||
| offset-type.h | ||
| parallel-for.h | ||
| pathstuff.cc | ||
| pathstuff.h | ||
| poison.h | ||
| preprocessor.h | ||
| print-utils.cc | ||
| print-utils.h | ||
| ptid.cc | ||
| ptid.h | ||
| ptrace.m4 | ||
| range-chain.h | ||
| README | ||
| refcounted-object.h | ||
| reference-to-pointer-iterator.h | ||
| rsp-low.cc | ||
| rsp-low.h | ||
| run-time-clock.cc | ||
| run-time-clock.h | ||
| safe-iterator.h | ||
| safe-strerror.cc | ||
| scope-exit.h | ||
| scoped_fd.h | ||
| scoped_ignore_signal.h | ||
| scoped_ignore_sigttou.h | ||
| scoped_mmap.cc | ||
| scoped_mmap.h | ||
| scoped_restore.h | ||
| search.cc | ||
| search.h | ||
| selftest.cc | ||
| selftest.h | ||
| selftest.m4 | ||
| signals-state-save-restore.cc | ||
| signals-state-save-restore.h | ||
| signals.cc | ||
| symbol.h | ||
| tdesc.cc | ||
| tdesc.h | ||
| thread-pool.cc | ||
| thread-pool.h | ||
| traits.h | ||
| underlying.h | ||
| valid-expr.h | ||
| version.h | ||
| warning.m4 | ||
| x86-xstate.h | ||
| xml-utils.cc | ||
| xml-utils.h | ||
This is a helper library that is used by gdb and gdbserver. To send patches, follow the gdb patch submission instructions in ../gdb/CONTRIBUTE. For maintainers, see ../gdb/MAINTAINERS.