Isilon: flexnet daemon is unable to properly tear down interfaces with parent lagg

Summary: This article describes an issue where isi_flexnet_d is unable to teardown vlan interfaces when the parent interface is a lagg.

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Symptoms

When a lagg is the parent of a vlan, we can fail to teardown the lagg properly, leaving flexnet in an endless loop due to an invalid lagg mode: 
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: [kern_sig.c:3924](pid 1639="isi_flexnet_d")(tid=100521) Stack trace:
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: Stack: --------------------------------------------------
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: /lib/libc.so.7:thr_kill+0xa
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: /lib/libc.so.7:abort+0x49
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: /usr/lib/libisi_util.so.1:isi_assert_halt+0x80
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: /usr/lib/libisi_net.so.1:lni_create_bonding_interface+0x6b0
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: /usr/lib/libisi_net.so.1:lni_ifconfigx_vlan+0x42
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: /usr/sbin/isi_flexnet_d:do_ifconfig+0x64
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: /usr/sbin/isi_flexnet_d:config_addrs+0x6cb
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: /usr/sbin/isi_flexnet_d:config_lni_vlans+0x260
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: /usr/sbin/isi_flexnet_d:update_local_interfaces+0xb04
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: /usr/sbin/isi_flexnet_d:update_local_networking+0x472
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: /usr/sbin/isi_flexnet_d:main+0x8fb
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: /usr/sbin/isi_flexnet_d:_start+0x17f
2020-05-13T16:53:44Z <0.5> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: --------------------------------------------------
2020-05-13T16:53:44Z <0.6> IME-SEA-IB-2(id2) /boot/kernel.amd64/kernel: pid 1639 (isi_flexnet_d), uid 0: exited on signal 6 (core dumped

Cause

The issue is a race condition during teardown. 

Resolution

Fix was released in GA RUP and later.  Install the latest patch for fix.
Article Properties
Article Number: 000183079
Article Type: Solution
Last Modified: 25 Aug 2022
Version:  2
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