Symptom
A Catalyst 9500 switch running affected code could crash when reverting an interface back to its default configuration:
Switch(config)#default interface TenGigabitEthernet1/1/8
Exception to IOS Thread:
Frame pointer 0x7F4FD1E88D90, PC = 0x55BDC3D80D84
UNIX-EXT-SIGNAL: Segmentation fault(11), Process = Exec
-Traceback= 1#2fb0770cbe4db5c2d6a4206a8344249f :55BDBF46E000+4912D84 :55BDBF46E000+699180F :55BDBF46E000+6992F0A :55BDBF46E000+69A53EB :55BDBF46E000+69A5384 :55BDBF46E000+4949638 :55BDBF46E000+48F6809 :55BDBF46E000+48F6133 :55BDBF46E000+348B4F7 iosd_shr_m_uk9_AAA_Core:7F5096E21000+82CB9E iosd_shr_m_uk9_AAA_Core:7F5096E21000+82C090 iosd_shr_m_uk9_AAA_Core:7F5096E21000+82A266 iosd_shr_m_uk9_AAA_Core:7F5096E21000+836C19 iosd_shr_m_uk9_AAA_Core:7F5096E21000+83738C iosd_shr_m_uk9_AAA_Core:7F5096E21000+7F1E7A :55BDBF46E000+490038C
Conditions
Exact conditions are under investigation. The crash is known to occur in MPLS tunnel code specifically, but the exact configuration required to trigger this crash are not yet known.
Workaround
Manually revert any configurations on an interface line-by-line, rather than using the 'default interface ...' command syntax.
Further Problem Description
