cygwinコミュのless のコアダンプ

Cygwinインストールフォルダーを2台のマシンで共有して使っています。5年ぐらい前からいくつかのマシンでこのような使い方をしていますが問題になったことはありません。

実際今の環境でもvim,perl,lsなど問題なく動きます。
ただ今の環境でless.exeで'/'でサーチするとコアダンプするという問題が起きてます。以下、strace の出力ですが何かヒントはあるでしょうか？

共有サーバーのマシンでは問題ありません。

604 5567138 [main] less 700 readv: readv (3, 0x22CC10, 1) blocking, sigcatchers 3
537 5567675 [main] less 700 readv: no need to call ready_for_read
273650 5841325 [main] less 700 fhandler_termios::line_edit: char 0xD
735 5842060 [main] less 700 readv: 1 = readv (3, 0x22CC10, 1), errno 2
650 5842710 [main] less 700 sig_send: sendsig 0x344, pid 700, signal -34, its_me 1
576 5843286 [main] less 700 sig_send: wakeup 0x324
625 5843911 [main] less 700 sig_send: Waiting for pack.wakeup 0x324
605 5844516 [sig] less 700 wait_sig: signalling pack.wakeup 0x324
579 5845095 [main] less 700 sig_send: returning 0x0 from sending signal -34
1113 5846208 [main] less 700 fhandler_console::write: 41E820, 7
574 5846782 [main] less 700 fhandler_console::write: at 27(0x20) state is 0
531 5847313 [main] less 700 fhandler_console::write: at 91([) state is 1
593 5847906 [main] less 700 fhandler_console::write: at 52(4) state is 2
563 5848469 [main] less 700 fhandler_console::write: at 52(4) state is 3
529 5848998 [main] less 700 fhandler_console::write: at 54(6) state is 3
1460 5850458 [main] less 700 fhandler_console::write: at 59(;) state is 3
615 5851073 [main] less 700 fhandler_console::write: at 49(1) state is 3
623 5851696 [main] less 700 fhandler_console::write: at 72(H) state is 3
540 5852236 [main] less 700 fhandler_console::write: at 72(H) state is 5
809 5853045 [main] less 700 fhandler_console::write: 7 = write_console (,..7)
--- Process 1184, exception C0000005 at 0022CC87