Date: Sun, 25 May 2025 09:27:15 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 287050] Change in PTRACE_CONTINUE causing valgrind/vgdb to no longer be able to interrupt debuggee Message-ID: <bug-287050-227-8Mmu4okyyo@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-287050-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287050 --- Comment #7 from Paul Floyd <pjfloyd@wanadoo.fr> --- For the reproducer, compile both parts clang -g -o ptrace ptrace.c -std=c23 clang -g -o sleeper sleeper.c -std=c23 Run 'sleeper' Then run 'ptrace' with 2 arguments, first the pid of 'sleeper' and second the address that 'sleeper' printed. On 14.2 I get sleeper: DEBUG: main invoke address is 0x201850 ptrace: ./ptrace 73282 0x201850 attach to 'main' pid 73282 attach main pid PT_ATTACH pid 73282 waitstopped attach main pid before waitpid signal_expected 17 after waitpid pid 73282 p 73282 status 0x117f WIFSTOPPED 17 calling getregs getregs call succeeded push bad_return return address ptrace_write_memory calling setregs setregs succeeded PT_CONTINUE to invoke waitstopped waitpid status after PTRACE_CONTINUE to invoke before waitpid signal_expected 17 after waitpid pid 73282 p 73282 status 0x0 WIFEXITED 0 (command prompt) sleeper again: DEBUG: invoker called On 15.0 I get sleeper: DEBUG: main invoke address is 0x2017c0 ptrace: ./ptrace 1244 0x2017c0 attach to 'main' pid 1244 attach main pid PT_ATTACH pid 1244 waitstopped attach main pid before waitpid signal_expected 17 after waitpid pid 1244 p 1244 status 0x117f WIFSTOPPED 17 calling getregs getregs call succeeded push bad_return return address ptrace_write_memory calling setregs setregs succeeded PT_CONTINUE to invoke waitstopped waitpid status after PTRACE_CONTINUE to invoke before waitpid signal_expected 17 There is no "after waitpid" message for ptrace and no return to the prompt. Also no invoker message from sleeper. -- You are receiving this mail because: You are the assignee for the bug.home | help
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