diff options
Diffstat (limited to 'gdb/linux-nat.c')
| -rw-r--r-- | gdb/linux-nat.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c index 6ca5c7e..3b117b5 100644 --- a/gdb/linux-nat.c +++ b/gdb/linux-nat.c @@ -414,6 +414,7 @@ holding the child stopped. Try \"set detach-on-fork\" or \ if (detach_fork) { struct cleanup *old_chain; + int status = 0; /* Before detaching from the child, remove all breakpoints from it. If we forked, then this has already been taken @@ -447,7 +448,29 @@ holding the child stopped. Try \"set detach-on-fork\" or \ if (linux_nat_prepare_to_resume != NULL) linux_nat_prepare_to_resume (child_lp); - ptrace (PTRACE_DETACH, child_pid, 0, 0); + + /* When debugging an inferior in an architecture that supports + hardware single stepping on a kernel without commit + 6580807da14c423f0d0a708108e6df6ebc8bc83d, the vfork child + process starts with the TIF_SINGLESTEP/X86_EFLAGS_TF bits + set if the parent process had them set. + To work around this, single step the child process + once before detaching to clear the flags. */ + + if (!gdbarch_software_single_step_p (target_thread_architecture + (child_lp->ptid))) + { + int status; + + linux_disable_event_reporting (child_pid); + if (ptrace (PTRACE_SINGLESTEP, child_pid, 0, 0) < 0) + perror_with_name (_("Couldn't do single step")); + if (my_waitpid (child_pid, &status, 0) < 0) + perror_with_name (_("Couldn't wait vfork process")); + } + + if (WIFSTOPPED (status)) + ptrace (PTRACE_DETACH, child_pid, 0, WSTOPSIG (status)); do_cleanups (old_chain); } |