(gdb) where
#0  0x00751d58 in strcmp () from /lib/tls/libc.so.6
#1  0x0805fe4a in etag_is_equal (etag=0x0, matches=0x0) at etag.c:7
#2  0x0806473d in http_response_handle_cachable (srv=0x0, con=0x8e6c260,
    mtime=0x8eb3348) at http-header-glue.c:245
#3  0x001682ba in mod_staticfile_subrequest (srv=0x8e1d008, con=0x8e6c260,
    p_d=0x8e3b9f8) at mod_staticfile.c:473
#4  0x0805f065 in plugins_call_handle_subrequest_start (srv=0x8e1d008,
    con=0x8e6c260) at plugin.c:268
#5  0x0804fe79 in http_response_prepare (srv=0x8e1d008, con=0x8e6c260)
    at response.c:618
#6  0x08052d78 in connection_state_machine (srv=0x8e1d008, con=0x8e6c260)
    at connections.c:1413
#7  0x0804e64d in main (argc=4, argv=0xbfe3f0b4) at server.c:1350