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Steps to reproduce: $ vtysh quagga# conf term quagga(config)# access-list DELETEME permit 192.0.2.1/32 quagga(config)# no access-list DELETEME permit 192.0.2.1/32 Warning: closing connection to ospfd because of an I/O error! And logged by ospfd: OSPF: Received signal 11 at 1323811450 (si_addr 0x0); aborting... Backtrace for 17 stack frames: /usr/lib64/quagga/libzebra.so.0(zlog_backtrace_sigsafe+0x3e)[0x7f101bfe0d4e] /usr/lib64/quagga/libzebra.so.0(zlog_signal+0x2ea)[0x7f101bfe142a] /usr/lib64/quagga/libzebra.so.0(+0x46305)[0x7f101bff0305] /lib64/libc.so.6(+0x3adbe33140)[0x7f101af8e140] /lib64/libc.so.6(+0x3adbf2d5ba)[0x7f101b0885ba] /usr/lib64/quagga/libospf.so.0(+0x22d06)[0x7f101c23fd06] /usr/lib64/quagga/libzebra.so.0(+0x2cc90)[0x7f101bfd6c90] /usr/lib64/quagga/libzebra.so.0(+0x2d059)[0x7f101bfd7059] /usr/lib64/quagga/libzebra.so.0(+0x20deb)[0x7f101bfcadeb] /usr/lib64/quagga/libzebra.so.0(cmd_execute_command+0xe6)[0x7f101bfcc6d6] /usr/lib64/quagga/libzebra.so.0(+0x1abb3)[0x7f101bfc4bb3] /usr/lib64/quagga/libzebra.so.0(+0x1ae30)[0x7f101bfc4e30] /usr/lib64/quagga/libzebra.so.0(+0x1b210)[0x7f101bfc5210] /usr/lib64/quagga/libzebra.so.0(thread_call+0x41)[0x7f101bfd1d41] ospfd(main+0x328)[0x7f101c700c38] /lib64/libc.so.6(__libc_start_main+0xfd)[0x7f101af79e5d] ospfd(+0x16f9)[0x7f101c7006f9] Bug found on quagga-0.99.18-2.fc14.x86_64 and still reproducible after updating to quagga-0.99.20-2.fc14.x86_64.
I was not able to to reproduce it (quagga-0.99.20-2.fc14.x86_64). In addition the Fedora 14 end of life has been announced just before reporting: https://lists.fedoraproject.org/pipermail/announce/2011-December/003023.html I've tried reproducing on F16. It works fine for me too. I'm going to close the bug. If you hit the problem on Fedora15+ again don't hesitate to reopen it.