Re: Multi-exec patches

[Tom Tromey <tromey@redhat.com>]

Tom> Can not resume the parent process over vfork in the foreground while 
Tom> holding the child stopped.  Try "set detach-on-fork" or "set schedule-multiple".
Tom> Recursive internal problem.
Tom> Aborted

I've appended the stack trace for this.

Tom> ../../archer/gdb/thread.c:708: internal-error: finish_thread_state: Assertion `tp' failed.

I couldn't reproduce this one.

I watched gdb run make a little more closely and I think the
sluggishness just comes from re-reading gcc's debuginfo each time make
starts a new gcc process.

I thought we may want some heuristic to keep debuginfo around a little
while before discarding it, for situations like this; but maybe speeding
up debuginfo reading would solve the problem more cleanly.

Tom

#0  0x0020f422 in __kernel_vsyscall ()
#1  0x005987c1 in raise () from /lib/libc.so.6
#2  0x0059a092 in abort () from /lib/libc.so.6
#3  0x080af8cb in internal_vproblem (problem=0x8cede58, 
    file=0x864244f "../../archer/gdb/inferior.c", line=44, 
    fmt=0x8642430 "%s: Assertion `%s' failed.", ap=0xbfffed6c "\343'd\bK$d\b")
    at ../../archer/gdb/utils.c:897
#4  0x080afa9a in internal_verror (
    file=0x864244f "../../archer/gdb/inferior.c", line=44, 
    fmt=0x8642430 "%s: Assertion `%s' failed.", ap=0xbfffed6c "\343'd\bK$d\b")
    at ../../archer/gdb/utils.c:995
#5  0x080afad2 in internal_error (
    file=0x864244f "../../archer/gdb/inferior.c", line=44, 
    string=0x8642430 "%s: Assertion `%s' failed.")
    at ../../archer/gdb/utils.c:1004
#6  0x080ba9e6 in current_inferior () at ../../archer/gdb/inferior.c:44
#7  0x080bbc27 in terminal_ours_1 (output_only=0)
    at ../../archer/gdb/inflow.c:369
#8  0x080bbc02 in terminal_ours () at ../../archer/gdb/inflow.c:347
#9  0x0819ecf8 in linux_nat_terminal_ours ()
    at ../../archer/gdb/linux-nat.c:4563
#10 0x080af830 in internal_vproblem (problem=0x8cede58, 
    file=0x864244f "../../archer/gdb/inferior.c", line=44, 
    fmt=0x8642430 "%s: Assertion `%s' failed.", ap=0xbfffeebc "\343'd\bK$d\b")
    at ../../archer/gdb/utils.c:912
#11 0x080afa9a in internal_verror (
    file=0x864244f "../../archer/gdb/inferior.c", line=44, 
    fmt=0x8642430 "%s: Assertion `%s' failed.", ap=0xbfffeebc "\343'd\bK$d\b")
    at ../../archer/gdb/utils.c:995
#12 0x080afad2 in internal_error (
    file=0x864244f "../../archer/gdb/inferior.c", line=44, 
    string=0x8642430 "%s: Assertion `%s' failed.")
    at ../../archer/gdb/utils.c:1004
#13 0x080ba9e6 in current_inferior () at ../../archer/gdb/inferior.c:44
#14 0x08244038 in switch_to_thread (ptid={pid = 22083, lwp = 22083, tid = 0})
    at ../../archer/gdb/thread.c:875
#15 0x08238934 in handle_inferior_event (ecs=0xbffff11c)
    at ../../archer/gdb/infrun.c:2885
#16 0x08237912 in wait_for_inferior (treat_exec_as_sigtrap=0)
    at ../../archer/gdb/infrun.c:2261
#17 0x0823704f in proceed (addr=4294967295, siggnal=TARGET_SIGNAL_0, step=0)
    at ../../archer/gdb/infrun.c:1866
#18 0x08230f41 in run_command_1 (args=0x0, from_tty=1, tbreak_at_main=0)
    at ../../archer/gdb/infcmd.c:577
#19 0x08230f71 in run_command (args=0x0, from_tty=1)
    at ../../archer/gdb/infcmd.c:587
#20 0x081bb80b in do_cfunc (c=0x8f0bcf0, args=0x0, from_tty=1)
    at ../../archer/gdb/cli/cli-decode.c:67
#21 0x081bde6a in cmd_func (cmd=0x8f0bcf0, args=0x0, from_tty=1)
    at ../../archer/gdb/cli/cli-decode.c:1738
#22 0x080ad20c in execute_command (p=0x8e9d9a3 "", from_tty=1)
    at ../../archer/gdb/top.c:442
#23 0x0824c37c in command_handler (command=0x8e9d9a0 "")
    at ../../archer/gdb/event-top.c:511
#24 0x0824c9ae in command_line_handler (
    rl=0x8f8f0a8 "\230\25\371\b\250\25\371\b")
    at ../../archer/gdb/event-top.c:735
#25 0x0832cf5e in rl_callback_read_char ()
    at ../../archer/readline/callback.c:205
#26 0x0824bb13 in rl_callback_read_char_wrapper (client_data=0x0)
    at ../../archer/gdb/event-top.c:178
#27 0x0824c249 in stdin_event_handler (error=0, client_data=0x0)
    at ../../archer/gdb/event-top.c:433
#28 0x0824afdc in handle_file_event (data={ptr = 0x0, integer = 0})
    at ../../archer/gdb/event-loop.c:812
#29 0x0824a820 in process_event () at ../../archer/gdb/event-loop.c:394
#30 0x0824a8e4 in gdb_do_one_event (data=0x0)
    at ../../archer/gdb/event-loop.c:459
#31 0x082458d0 in catch_errors (func=0x824a82e <gdb_do_one_event>, 
    func_args=0x0, errstring=0x866a906 "", mask=6)
    at ../../archer/gdb/exceptions.c:510
#32 0x081ce259 in tui_command_loop (data=0x0)
    at ../../archer/gdb/tui/tui-interp.c:153
#33 0x08245e48 in current_interp_command_loop ()
    at ../../archer/gdb/interps.c:291
#34 0x080a5a8b in captured_command_loop (data=0x0)
    at ../../archer/gdb/main.c:226
#35 0x082458d0 in catch_errors (func=0x80a5a80 <captured_command_loop>, 
    func_args=0x0, errstring=0x863ca18 "", mask=6)
    at ../../archer/gdb/exceptions.c:510
#36 0x080a6985 in captured_main (data=0xbffff6c0)
    at ../../archer/gdb/main.c:902
#37 0x082458d0 in catch_errors (func=0x80a5ac1 <captured_main>, 
    func_args=0xbffff6c0, errstring=0x863ca18 "", mask=6)
    at ../../archer/gdb/exceptions.c:510
#38 0x080a69bb in gdb_main (args=0xbffff6c0) at ../../archer/gdb/main.c:911
#39 0x080a5813 in main (argc=2, argv=0xbffff784) at ../../archer/gdb/gdb.c:33