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error) >> + ), >> + TP_fast_assign( >> + memcpy(__entry->addr, &clp->cl_addr, >> + sizeof(struct sockaddr_in6)); >> + __assign_str(dev); >> + __entry->error = error; >> + ), >> + TP_printk("client=%pISpc dev=%s error=%d", >> + __entry->addr, >> + __get_str(dev), >> + __entry->error >> + ) > Have a look at the nfsd_cs_slot_class event class (fs/nfsd/trace.h) to > see how to use the trace subsystem's native sockaddr handling. The native sockaddr handling used by nfsd_cs_slot_class seems to be broken: [opc]# trace-cmd record -e nfsd_slot_seqid_conf -e nfsd_slot_seqid_unconf [opc]# trace-cmd report CPU 0 is empty ... CPU 15 is empty cpus=16 nfsd-2784 [011] 1205.355839: nfsd_slot_seqid_unconf: [FAILED TO PARSE] seqid=1 slot_seqid=0 cl_boot=1762214337 cl_id=3172331794 addr= [opc]# After changing 'nfsd_pnfs_class' to use native sockaddr handling: [opc]# trace-cmd record -e nfsd_pnfs_fence kworker/u65:0-7458 [001] 933.253811: nfsd_pnfs_fence: [FAILED TO PARSE] addr=ARRAY[02, 00, 02, f9, 64, 64, fa, 2b, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00] netns_ino=4026531833 dev=sdb error=24 [opc]# -Dai > > Do you want to record anything else here? The cl_boot/cl_id, perhaps? I > guess there's no XID available... but is there a relevant state ID? >