Has anybody had experiences with txg_sync hangs?

It's a linux system that I am looking at but the stack trace has enough ZFS in it that sound familiar to me

including calls to zio_wait which would tell me it's disk related?

My stack trace foo might be off though

uh oh I see DID_BAD_TARGET in the megaraid_sas output above

[illumos-gate] 15150 WPTS FileInfo_Query_FileAccessInformation_DataSuffix -- Gordon Ross <gwr⊙rc>

[illumos-gate] 15153 WPTS FileInfo_Query_FileIdInformation_Dir/File fails -- Gordon Ross <gwr⊙rc>

[illumos-gate] 15154 WPTS FSA BVT_AlternateDataStream_ListStreams_File -- Gordon Ross <gwr⊙rc>

[illumos-gate] 15155 WPTS BVT_SMB2Basic_Query_FileNormalizedNameInformation -- Gordon Ross <gwr⊙rc>

[illumos-gate] 15165 SMN accesses are size-sensitive -- Keith M Wesolowski <wesolows⊙oc>