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CONTAP-385089: After network interruption, SM-S/SMas fails to resync with "Operation is not supported as it is involved in a pending operation"

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Issue

Following a network interruption and subsequent SnapMirror Synchronous (SM-S) Out of Sync (OOS), a SM-S relationship is unable to resync. 
The affected SM-S relationship repeatedly fails to resync, logging the error:
Failed to remove replication resources from source.(SnapMirror Synchronous Endpoint operation is not supported as it is involved in a pending operation.)
On the SM-S source, sktrace contains messages similar to:
 
2026-01-27T20:31:06Z 42460276014530722 [16:0] REPL_0: repl_granular::IFTT::addCookieToRetryList(): | [af239841-925b-11f0-b013-d039eab4aca1] | [0xfffff68125fc5f10] | [0] Adding cookie to IFTT retry List, seqNo: 458764 size: 1 cookie: 0xfffff886b6d4e040 iftp_op_seq_num: 10311902 iftp_max_acked_seq_num: 10311899 replStatus: 0
2026-01-28T01:31:16Z 42499803848725168 [22:0] REPL_0: granular::Splitter::startSplitting(): | [af239841-925b-11f0-b013-d039eab4aca1] | [0xfffff68125fc1000] | [4400251] | [refcount:34] Failing op with ERETRY as isIftpLoggingThrottleRequired is true
2026-01-28T01:31:16Z 42499803848746552 [22:0] REPL_0: granular::Splitter::_postDecrementInFlightOpCount(): | [af239841-925b-11f0-b013-d039eab4aca1] | [0xfffff68125fc1000] | [4400251] | [refcount:35] msg: 0xfffff89f2dffe170 cookie: 0xfffff83fe3b05040 seqNo: 0 state: 1 primaryStatus: 292 repl result: [status:0] oosOnFailure: 1 cookie type: 1 is_lun_metadata_op_cookie: 0 ctx-type: 0
2026-01-28T01:31:17Z 42499804418039860 [14:0] REPL_0: granular::Splitter::_postDecrementInFlightOpCount(): | [af239841-925b-11f0-b013-d039eab4aca1] | [0xfffff68125fc1000] | [4400251] | [refcount:17] Suspending state egress for msg: 0xfffff89fca212950 cookie: 0xfffff850d2435040 cookie seqNo: 0 state: 129 repl result: [status:0] primaryStatus: 292 

 

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