bug#7402: 23.2; loading tramp causes emacs to freeze

[Hans Rosenfeld]

On Wed, Jan 19, 2011 at 05:47:45PM +0100, Michael Albinus wrote:
> Hmm. Sometimes, it is possible to reanimate a frozen Emacs sending
> SIGFPE from a shell. Could you try this? If you set debug-on-error to t
> before loading Tramp, we would get an elisp backtrace, which might tell
> us more.

With debug-on-error set, it hangs after "entering debugger" in the
minibuffer. SIGFPE doesn't work, but I get this from pstack:

 fe414125 _so_socket (1, 2, 0, 1, fe4a40e0) + 15
 fe85bfef socket   (1, 2, 0, 1fc2c760, fe93d0e4, 0) + 23
 fe924cf5 _dbus_open_socket (2, 0, 8046bac, fe000a2e, 8fb3058, 40) + 30
 fe925476 _dbus_open_unix_socket (8046adc, 8046bac, 8046a88, fe921536, 8fb3058, 
39) + 29
 fe92576d _dbus_connect_unix_socket (1fc2c718, 0, 8046bac, fe91f346, 0, 
1fd14638) + 30
 fe91d10e _dbus_transport_new_for_domain_socket (1fc2c718, 0, 8046bac, 
c8247198, 48416830, 48416800) + ce
 fe91d2d9 _dbus_transport_open_platform_specific (8f33460, 8046bbc, 8046bac, 
8fb3038, 3f8, fe4a3000) + 14a
 fe91ba31 _dbus_transport_open (8f33460, 8046c1c, 8046c08, 8047110, 3f4, 3) + b5
 fe908993 _dbus_connection_open_internal (8047110, 5e, 8046c78, fe9099dc, 5e, 
5e) + 235
 fe908d4c dbus_connection_open (8eb2760, 8047110, 8046c79, 5e, 8046d10, 
8046d6f) + ba
 fe903232 internal_bus_get (8047110, 5e, 8046d08, 8046d10, 0, 4844cf28) + 33b
 fe90334d dbus_bus_get (1, 8047110, 3ff, 8046d54, 6c696146, 74206465) + 19
 08146532 xd_initialize (0, 6d657473, 17, a84213a8, 8047230, 1) + fb
 08148116 xd_get_dispatch_status (4844cf28, 17, 80471a8, 81f9cb0, 88f2e28, 18) 
+ f
 08148173 xd_pending_messages (48416800, 4843f9b8, 16, 81fa4b7, 4843f9b8, 
c8cb2260) + 35
 0815ad4b readable_events (88f2e28, 17, 80471e8, a84213a8, ed, 48416800) + f
 0815ae3b get_input_pending (48421ce0, c8cb2260, 5c, 17, 18, a8cf38a8) + 24
 0815af1b detect_input_pending_run_timers (0, 1, 8047228, 68d232c4, 804725c, 1) 
+ 25
 0815dea2 read_char (1, 2, 8047380, 48416800, 804740c, 0) + 35a
 08160669 read_key_sequence (0, 1, 1, c8c4f4b0, a, c8c4f4b0) + 5cf
 081623d7 command_loop_1 (80475bc, 1, 0, fe6a0118, 1, fe4a3000) + 2da
 081b5eed internal_condition_case (81620fd, 48424648, 815d1fa, 804765c, 
80476a8, fef903f8) + bb
 0815c83b command_loop_2 (48416800, 0, 0, 84213a8, 8444028, 684434ac) + 23
 081b5f86 internal_catch (48423b28, 815c818, 48416800, 8458ea0, 8458eb0, 
8458ea0) + 85
 0815d073 command_loop (48444028, 48416800, 821f11b, 804771c, 80476f8, 
48416800) + 80
 0815d38c recursive_edit_1 (815774f, 48416800, 1, 804771c, 822204c, 0) + 7a
 0815d4b2 Frecursive_edit (821f11b, 0, 1, 0, 1, 1) + ca
 081538ae main     (8216dea, feffb804, 804782c, 809f903, 2, 8047838) + 1457
 0809f903 _start   (2, 8047984, 804798a, 0, 8047993, 80479af) + 83


I rebuilt emacs without dbus support, and it did not show the original
problem, tramp just works.


-- 
%SYSTEM-F-ANARCHISM, The operating system has been overthrown