Don't call "detach_inferior" on "remote_follow_fork"
This patch fixes a regression that has been introduced by: commitbc09b0c14f
Date: Fri Jan 19 11:48:11 2018 -0500 Make linux_nat_detach/thread_db_detach use the inferior parameter It is possible to trigger this failure with gdb.base/foll-fork.exp (in which case a bunch of ERROR's will be printed), but one can also use the test below. Consider the following example program: #include <unistd.h> int main (int argc, char *argv[]) { fork (); return 0; } When running it under gdbserver: # ./gdb/gdbserver/gdbserver --multi --once :2345 And debugging it under GDB, we see a segmentation fault: # ./gdb/gdb -q -batch -ex 'set remote exec-file ./a.out' -ex 'tar extended-remote :2345' -ex r ./a.out Starting program: ... [Detaching after fork from child process 16102.] Segmentation fault (core dumped) The problem happens on inferior.c:detach_inferior: void detach_inferior (inferior *inf) { /* Save the pid, since exit_inferior_1 will reset it. */ int pid = inf->pid; ^^^^^^^^^ exit_inferior_1 (inf, 0); if (print_inferior_events) printf_unfiltered (_("[Inferior %d detached]\n"), pid); } When this code is called from remote.c:remote_follow_fork, the PID is valid but there is no 'inferior' associated with it, which means that 'inf == NULL'. The proper fix here is to not call "detach_inferior" when doing remote follow-fork, because we don't have an inferior to detach on the host side. Beforebc09b0c1
, that call was already a nop (exit_inferior_1 bails out early if you pass it a NULL inferior), except that it printed "Inferior PID detached" when "set print inferior-events" is on. Since native debugging doesn't call detach_inferior in this case, removing the call from remote aligns remote debugging output with native debugging output further. This has been regtested using BuildBot and no regressions were found. gdb/ChangeLog: 2018-01-29 Sergio Durigan Junior <sergiodj@redhat.com> * remote.c (remote_follow_fork): Don't call "detach_inferior".
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2018-01-29 Sergio Durigan Junior <sergiodj@redhat.com>
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* remote.c (remote_follow_fork): Don't call "detach_inferior".
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2018-01-28 Simon Marchi <simon.marchi@ericsson.com>
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* dwarf2read.c (free_dwo_files): Add forward-declaration.
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@ -5206,7 +5206,6 @@ remote_follow_fork (struct target_ops *ops, int follow_child,
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child_pid = ptid_get_pid (child_ptid);
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remote_detach_pid (child_pid);
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detach_inferior (child_pid);
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}
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}
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return 0;
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