Started Evolution, tried to get messages for GMail IMAP subfolder (concurrent connections = 1; only one GMail account enabled; "save content for offline usage" enabled for that subfolder). Applied Ctrl+Y (filter message) on some messages in that subfolder; Evolution ended up displaying a bunch of things in the status bar and pressing the "Cancel" button does nothing as usual.

After Ctrl+C in gdb:

Program received signal SIGINT, Interrupt.
0xb7fdbbc8 in __kernel_vsyscall ()
(gdb) thread apply all bt 

+ Trace 235184

(gdb) list
421		EShell *shell;
422		GSettings *settings;
423	#ifdef DEVELOPMENT
424		gboolean skip_warning_dialog;
425	#endif
426		GError *error = NULL;
427	
428	#ifdef G_OS_WIN32
429		e_util_win32_initialize ();
430	#endif
(gdb) info register
eax            0xfffffdfc	-516
ecx            0x4	4
edx            0x11	17
ebx            0xa402628	171976232
esp            0xbfffedc4	0xbfffedc4
ebp            0x4	0x4
esi            0x8077428	134706216
edi            0xa402628	171976232
eip            0xb7fdbbc8	0xb7fdbbc8 <__kernel_vsyscall+16>
eflags         0x292	[ AF SF IF ]
cs             0x73	115
ss             0x7b	123
ds             0x7b	123
es             0x7b	123
fs             0x0	0
gs             0x33	51