PR threads/18600: Inferiors left around after fork+thread spawn
The new gdb.threads/fork-plus-threads.exp test exposes one more problem. When one types "info inferiors" after running the program, one see's a couple inferior left still, while there should only be inferior #1 left. E.g.: (gdb) info inferiors Num Description Executable 4 process 8393 /home/pedro/bugs/src/test 2 process 8388 /home/pedro/bugs/src/test * 1 <null> /home/pedro/bugs/src/test (gdb) info threads Calling prune_inferiors() manually at this point (from a top gdb) does not remove them, because they still have inf->pid != 0 (while they shouldn't). This suggests that we never mourned those inferiors. Enabling logs (master + previous patch) we see: ... WL: waitpid Thread 0x7ffff7fc2740 (LWP 9513) received Trace/breakpoint trap (stopped) WL: Handling extended status 0x03057f LHEW: Got clone event from LWP 9513, new child is LWP 9579 [New Thread 0x7ffff37b8700 (LWP 9579)] WL: waitpid Thread 0x7ffff7fc2740 (LWP 9508) received 0 (exited) WL: Thread 0x7ffff7fc2740 (LWP 9508) exited. ^^^^^^^^ [Thread 0x7ffff7fc2740 (LWP 9508) exited] WL: waitpid Thread 0x7ffff7fc2740 (LWP 9499) received 0 (exited) WL: Thread 0x7ffff7fc2740 (LWP 9499) exited. [Thread 0x7ffff7fc2740 (LWP 9499) exited] RSRL: resuming stopped-resumed LWP Thread 0x7ffff37b8700 (LWP 9579) at 0x3615ef4ce1: step=0 ... (gdb) info inferiors Num Description Executable 5 process 9508 /home/pedro/bugs/src/test ^^^^ 4 process 9503 /home/pedro/bugs/src/test 3 process 9500 /home/pedro/bugs/src/test 2 process 9499 /home/pedro/bugs/src/test * 1 <null> /home/pedro/bugs/src/test (gdb) ... Note the "Thread 0x7ffff7fc2740 (LWP 9508) exited." line. That's this in wait_lwp: /* Check if the thread has exited. */ if (WIFEXITED (status) || WIFSIGNALED (status)) { thread_dead = 1; if (debug_linux_nat) fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", target_pid_to_str (lp->ptid)); } } That was the leader thread reporting an exit, meaning the whole process is gone. So the problem is that this code doesn't understand that an WIFEXITED status of the leader LWP should be reported to infrun as process exit. gdb/ChangeLog: 2015-07-30 Pedro Alves <palves@redhat.com> PR threads/18600 * linux-nat.c (wait_lwp): Report to the core when thread group leader exits. gdb/testsuite/ChangeLog: 2015-07-30 Pedro Alves <palves@redhat.com> PR threads/18600 * gdb.threads/fork-plus-threads.exp: Test that "info inferiors" only shows inferior 1.
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@ -1,3 +1,9 @@
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2015-07-30 Pedro Alves <palves@redhat.com>
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PR threads/18600
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* linux-nat.c (wait_lwp): Report to the core when thread group
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leader exits.
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2015-07-30 Pedro Alves <palves@redhat.com>
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Simon Marchi <simon.marchi@ericsson.com>
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@ -2274,6 +2274,20 @@ wait_lwp (struct lwp_info *lp)
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/* Check if the thread has exited. */
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if (WIFEXITED (status) || WIFSIGNALED (status))
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{
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if (ptid_get_pid (lp->ptid) == ptid_get_lwp (lp->ptid))
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{
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if (debug_linux_nat)
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fprintf_unfiltered (gdb_stdlog, "WL: Process %d exited.\n",
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ptid_get_pid (lp->ptid));
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/* This is the leader exiting, it means the whole
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process is gone. Store the status to report to the
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core. Store it in lp->waitstatus, because lp->status
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would be ambiguous (W_EXITCODE(0,0) == 0). */
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store_waitstatus (&lp->waitstatus, status);
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return 0;
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}
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thread_dead = 1;
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if (debug_linux_nat)
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fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n",
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@ -1,3 +1,9 @@
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2015-07-30 Pedro Alves <palves@redhat.com>
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PR threads/18600
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* gdb.threads/fork-plus-threads.exp: Test that "info inferiors"
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only shows inferior 1.
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2015-07-30 Simon Marchi <simon.marchi@ericsson.com>
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Pedro Alves <palves@redhat.com>
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@ -60,6 +60,10 @@ proc do_test { detach_on_fork } {
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gdb_test "info threads" "No threads\." \
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"no threads left"
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gdb_test "info inferiors" \
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"Num\[ \t\]+Description\[ \t\]+Executable\[ \t\]+\r\n\\* 1 \[^\r\n\]+" \
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"only inferior 1 left"
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}
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foreach detach_on_fork {"on" "off"} {
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