Chuck, We are now seeing this in the first RC: [31868.644165] ------------[ cut here ]------------ [31868.650059] failed to drain recv queue: -22 [31868.655191] WARNING: CPU: 32 PID: 559 at drivers/infiniband/core/verbs.c:2738 __ib_drain_rq+0x163/0x1a0 [ib_core] [31868.657234] ------------[ cut here ]------------ [31868.667133] Modules linked in: nfsv3 [31868.672832] failed to drain send queue: -22 [31868.677279] nfs_acl rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache netfs tcp_diag udp_diag raw_diag inet_diag rfkill ib_isert iscsi_target_mod target_core_mod rpcrdma ib_iser rdma_ucm opa_vnic rdma_cm ib_umad libiscsi ib_ipoib scsi_transport_iscsi ib_cm iw_cm sunrpc hfi1 mgag200 intel_rapl_msr intel_rapl_common drm_kms_helper sb_edac syscopyarea rdmavt x86_pkg_temp_thermal sysfillrect intel_powerclamp ipmi_si ib_uverbs sysimgblt coretemp fb_sys_fops cec ipmi_devintf drm crct10dif_pclmul crc32_pclmul iTCO_wdt iTCO_vendor_support ghash_clmulni_intel ib_core mei_me rapl intel_cstate mei lpc_ich mxm_wmi i2c_i801 [31868.682425] WARNING: CPU: 65 PID: 608575 at drivers/infiniband/core/verbs.c:2705 __ib_drain_sq+0x14d/0x190 [ib_core] On the same tests, the mount command fails with a connection refused... Any ideas on this? 5.13.1 (the first 5.13.y release) tests fine. Mike