Node goes down with PANIC : process on cpu8 hung
Applies to
- ONTAP
- AFF and FAS systems
Issue
- In our case the node went down multiple times with different panic messages:
PANIC : process on cpu8 hung (xor_cp_thread_2) for 5001 milliseconds! in SK process xor_cp_thread_2 on release 9.12.1P4 (C)
PANIC : thread (NwkThd_03) on cpu 8 hung for 4001 milliseconds in process NwkThd_03 on release 9.12.1P4 (C)
PANIC : process on cpu8 hung (sd_main) for 5004 milliseconds! in SK process sd_main on release 9.12.1P4 (C)
- All these 3 panics were happening at these below mentioned functions:
xor_c2_cnt_cksum_sse2
xor_cksum_cnt_sse2
aes_enc_128_sse
- All these functions were hung on CPU 8.