gdb/gdb-gnat-dwarf-crash-3of3.patch

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From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
From: Fedora GDB patches <invalid@email.com>
Date: Fri, 27 Oct 2017 21:07:50 +0200
Subject: gdb-gnat-dwarf-crash-3of3.patch
;; Fix crash of -readnow /usr/lib/debug/usr/bin/gnatbind.debug (BZ 1069211).
;;=push+jan
http://sourceware.org/ml/gdb-patches/2014-02/msg00731.html
--6TrnltStXW4iwmi0
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Hi,
PR 16581:
GDB crash on inherit_abstract_dies infinite recursion
https://sourceware.org/bugzilla/show_bug.cgi?id=16581
fixed crash from an infinite recursion. But in rare cases the new code can
now gdb_assert() due to weird DWARF file.
I do not yet fully understand why the DWARF is as it is but just GDB should
never crash due to invalid DWARF anyway. The "invalid" DWARF I see only in
Fedora GCC build, not in FSF GCC build, more info at:
https://bugzilla.redhat.com/show_bug.cgi?id=1069382
http://people.redhat.com/jkratoch/gcc-debuginfo-4.8.2-7.fc20.x86_64-gnatbind.debug
Thanks,
Jan
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Content-Disposition: inline; filename="complaint.patch"
gdb/
2014-02-24 Jan Kratochvil <jan.kratochvil@redhat.com>
* dwarf2read.c (process_die): Change gdb_assert to complaint.
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -10586,6 +10586,13 @@ private:
static void
process_die (struct die_info *die, struct dwarf2_cu *cu)
{
+ if (die->in_process)
+ {
+ complaint (_("DIE at 0x%s attempted to be processed twice"),
+ sect_offset_str (die->sect_off));
+ return;
+ }
+
process_die_scope scope (die, cu);
switch (die->tag)
diff --git a/gdb/infrun.c b/gdb/infrun.c
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -609,6 +609,13 @@ holding the child stopped. Try \"set detach-on-fork\" or \
target_pid_to_str (process_ptid));
}
+#ifdef NEED_DETACH_SIGSTOP
+ /* We should check PID_WAS_STOPPED and detach it stopped accordingly.
+ In this point of code it cannot be 1 as we would not get FORK
+ executed without CONTINUE first which resets PID_WAS_STOPPED.
+ We would have to first TARGET_STOP and WAITPID it as with running
+ inferior PTRACE_DETACH, SIGSTOP will ignore the signal. */
+#endif
target_detach (parent_inf, 0);
}
diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -191,6 +191,12 @@ struct linux_nat_target *linux_target;
/* Does the current host support PTRACE_GETREGSET? */
enum tribool have_ptrace_getregset = TRIBOOL_UNKNOWN;
+#ifdef NEED_DETACH_SIGSTOP
+/* PID of the inferior stopped by SIGSTOP before attaching (or zero). */
+static pid_t pid_was_stopped;
+
+#endif
+
static unsigned int debug_linux_nat;
static void
show_debug_linux_nat (struct ui_file *file, int from_tty,
@@ -1030,6 +1036,9 @@ linux_nat_post_attach_wait (ptid_t ptid, int *signalled)
if (debug_linux_nat)
fprintf_unfiltered (gdb_stdlog,
"LNPAW: Attaching to a stopped process\n");
+#ifdef NEED_DETACH_SIGSTOP
+ pid_was_stopped = ptid.pid ();
+#endif
/* The process is definitely stopped. It is in a job control
stop, unless the kernel predates the TASK_STOPPED /
@@ -1362,6 +1371,25 @@ get_detach_signal (struct lwp_info *lp)
return gdb_signal_to_host (signo);
}
+#ifdef NEED_DETACH_SIGSTOP
+ /* Workaround RHEL-5 kernel which has unreliable PTRACE_DETACH, SIGSTOP (that
+ many TIDs are left unstopped). See RH Bug 496732. */
+ if (lp->ptid.pid () == pid_was_stopped)
+ {
+ int err;
+
+ errno = 0;
+ err = kill_lwp (lp->ptid.lwp (), SIGSTOP);
+ if (debug_linux_nat)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "SC: lwp kill %d %s\n",
+ err,
+ errno ? safe_strerror (errno) : "ERRNO-OK");
+ }
+ }
+
+#endif
return 0;
}
@@ -1510,6 +1538,10 @@ linux_nat_target::detach (inferior *inf, int from_tty)
detach_one_lwp (main_lwp, &signo);
detach_success (inf);
+
+#ifdef NEED_DETACH_SIGSTOP
+ pid_was_stopped = 0;
+#endif
}
}
@@ -1768,6 +1800,16 @@ linux_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signo)
return;
}
+#ifdef NEED_DETACH_SIGSTOP
+ /* At this point, we are going to resume the inferior and if we
+ have attached to a stopped process, we no longer should leave
+ it as stopped if the user detaches. PTID variable has PID set to LWP
+ while we need to check the real PID here. */
+
+ if (!step && lp && pid_was_stopped == lp->ptid.pid ())
+ pid_was_stopped = 0;
+
+#endif
if (resume_many)
iterate_over_lwps (ptid, linux_nat_resume_callback, lp);
@@ -3761,6 +3803,10 @@ linux_nat_target::mourn_inferior ()
/* Let the arch-specific native code know this process is gone. */
linux_target->low_forget_process (pid);
+#ifdef NEED_DETACH_SIGSTOP
+
+ pid_was_stopped = 0;
+#endif
}
/* Convert a native/host siginfo object, into/from the siginfo in the
diff --git a/gdb/testsuite/gdb.threads/attach-stopped.exp b/gdb/testsuite/gdb.threads/attach-stopped.exp
--- a/gdb/testsuite/gdb.threads/attach-stopped.exp
+++ b/gdb/testsuite/gdb.threads/attach-stopped.exp
@@ -56,7 +56,65 @@ proc corefunc { threadtype } {
gdb_reinitialize_dir $srcdir/$subdir
gdb_load ${binfile}
- # Verify that we can attach to the stopped process.
+ # Verify that we can attach to the process by first giving its
+ # executable name via the file command, and using attach with the
+ # process ID.
+
+ set test "$threadtype: set file, before attach1 to stopped process"
+ gdb_test_multiple "file $binfile" "$test" {
+ -re "Load new symbol table from.*y or n. $" {
+ gdb_test "y" "Reading symbols from $escapedbinfile\.\.\.*done." \
+ "$test (re-read)"
+ }
+ -re "Reading symbols from $escapedbinfile\.\.\.*done.*$gdb_prompt $" {
+ pass "$test"
+ }
+ }
+
+ set test "$threadtype: attach1 to stopped, after setting file"
+ gdb_test_multiple "attach $testpid" "$test" {
+ -re "Attaching to program.*`?$escapedbinfile'?, process $testpid.*$gdb_prompt $" {
+ pass "$test"
+ }
+ }
+
+ # ".*sleep.*clone.*" would fail on s390x as bt stops at START_THREAD there.
+ if {[string equal $threadtype threaded]} {
+ gdb_test "thread apply all bt" ".*sleep.*start_thread.*" "$threadtype: attach1 to stopped bt"
+ } else {
+ gdb_test "bt" ".*sleep.*main.*" "$threadtype: attach1 to stopped bt"
+ }
+
+ # Exit and detach the process.
+
+ gdb_exit
+
+ # Avoid some race:
+ sleep 2
+
+ if [catch {open /proc/${testpid}/status r} fileid] {
+ set line2 "NOTFOUND"
+ } else {
+ gets $fileid line1;
+ gets $fileid line2;
+ close $fileid;
+ }
+
+ set test "$threadtype: attach1, exit leaves process stopped"
+ if {[string match "*(stopped)*" $line2]} {
+ pass $test
+ } else {
+ fail $test
+ }
+
+ # At this point, the process should still be stopped
+
+ gdb_start
+ gdb_reinitialize_dir $srcdir/$subdir
+ gdb_load ${binfile}
+
+ # Verify that we can attach to the process just by giving the
+ # process ID.
set test "$threadtype: attach2 to stopped, after setting file"
gdb_test_multiple "attach $testpid" "$test" {