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dkim=pass header.d=citrix.com header.s=securemail header.b=PkHkMZyi; dkim=pass header.d=citrix.onmicrosoft.com header.s=selector2-citrix-onmicrosoft-com header.b=JLFWumrC; arc=pass ("microsoft.com:s=arcselector9901:i=1"); dmarc=pass (policy=reject) header.from=citrix.com; spf=pass (mx1.freebsd.org: domain of "prvs=061b0cdbb=roger.pau@citrix.com" designates 216.71.145.142 as permitted sender) smtp.mailfrom="prvs=061b0cdbb=roger.pau@citrix.com" X-Spamd-Result: default: False [-5.64 / 15.00]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+exists:216.71.145.142.spf.hc3370-68.iphmx.com]; RCVD_DKIM_ARC_DNSWL_MED(-0.50)[]; DKIM_TRACE(0.00)[citrix.com:+,citrix.onmicrosoft.com:+]; RCVD_IN_DNSWL_MED(-0.20)[216.71.145.142:from]; DMARC_POLICY_ALLOW(-0.50)[citrix.com,reject]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FREEMAIL_TO(0.00)[gmail.com]; RCVD_COUNT_ZERO(0.00)[0]; MIME_TRACE(0.00)[0:+]; R_MIXED_CHARSET(0.56)[subject]; ASN(0.00)[asn:16417, ipnet:216.71.145.0/24, country:US]; FROM_NEQ_ENVFROM(0.00)[roger.pau@citrix.com,prvs=061b0cdbb=roger.pau@citrix.com]; ARC_ALLOW(-1.00)[microsoft.com:s=arcselector9901:i=1]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[citrix.com:s=securemail,citrix.onmicrosoft.com:s=selector2-citrix-onmicrosoft-com]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; FORGED_SENDER_VERP_SRS(0.00)[]; DWL_DNSWL_LOW(-1.00)[citrix.com:dkim]; TO_MATCH_ENVRCPT_SOME(0.00)[]; MLMMJ_DEST(0.00)[freebsd-xen]; MID_RHS_NOT_FQDN(0.50)[] X-ThisMailContainsUnwantedMimeParts: N On Thu, Mar 10, 2022 at 01:41:28PM +0200, Ze Dupsys wrote: > On 2022.03.09. 10:42, Roger Pau Monné wrote: > > On Sun, Mar 06, 2022 at 02:41:17PM +0200, Ze Dupsys wrote: > > > Then i caught another sysctl variable that is growing due to XEN, > > > "kern.msgbuf: Contents of kernel message buffer". I do not know how this > > > variable grows or by which component it is managed, but in VM start/stop > > > case it grows and contains lines with pattern like so: > > > .. > > > xnb(xnb_rxpkt2rsp:2059): Got error -1 for hypervisor gnttab_copy status > > > xnb(xnb_ring2pkt:1526): Unknown extra info type 255.  Discarding packet > > > xnb(xnb_dump_txreq:299): netif_tx_request index =0 > > > xnb(xnb_dump_txreq:300): netif_tx_request.gref  =0 > > > xnb(xnb_dump_txreq:301): netif_tx_request.offset=0 > > > xnb(xnb_dump_txreq:302): netif_tx_request.flags =8 > > > xnb(xnb_dump_txreq:303): netif_tx_request.id    =69 > > > xnb(xnb_dump_txreq:304): netif_tx_request.size  =1000 > > > xnb(xnb_dump_txreq:299): netif_tx_request index =1 > > > xnb(xnb_dump_txreq:300): netif_tx_request.gref  =255 > > > xnb(xnb_dump_txreq:301): netif_tx_request.offset=0 > > > xnb(xnb_dump_txreq:302): netif_tx_request.flags =0 > > > xnb(xnb_dump_txreq:303): netif_tx_request.id    =0 > > > xnb(xnb_dump_txreq:304): netif_tx_request.size  =0 > > > .. > > > > > > Those lines in that variable just keep growing and growing, it is not that > > > they are flushed, trimmed or anything. Each time i get the same message on > > > serial output, it has one more section of error appended to "same-previous" > > > serial output message and sysctl variable as well. Thus at some point serial > > > output and sysctl contains a large block of those errors while VM is > > > starting. So at some point the value of this sysctl could be reaching max > > > allowed/available and this makes the system panic.  I do not know the reason > > > for those errors, but actually if there was a patch to suppress them, this > > > could be "solved". Another diff chunk might be related to this: > > > +dev.xnb.1.xenstore_peer_path: /local/domain/7/device/vif/0 > > > +dev.xnb.1.xenbus_peer_domid: 7 > > > +dev.xnb.1.xenbus_connection_state: InitWait > > > +dev.xnb.1.xenbus_dev_type: vif > > > +dev.xnb.1.xenstore_path: backend/vif/7/0 > > > +dev.xnb.1.dump_rings: > > > +dev.xnb.1.unit_test_results: xnb_rxpkt2rsp_empty:1765 Assertion Error: > > > nr_reqs == 0 > > > +xnb_rxpkt2rsp_empty:1767 Assertion Error: memcmp(&rxb_backup, > > > &xnb_unit_pvt.rxb, sizeof(rxb_backup)) == 0 > > > +xnb_rxpkt2rsp_empty:1769 Assertion Error: memcmp(&rxs_backup, > > > xnb_unit_pvt.rxs, sizeof(rxs_backup)) == 0 > > > +52 Tests Passed > > > +1 Tests FAILED > > So you have failed tests for netback. Maybe the issue is with > > netback rather than blkback. > > Just found that there are no errors with network, most probably. Based on > https://reviews.freebsd.org/D9234?id=24172#201024, since i was monitoring > sysctl variables with 'sysctl -a', most probably that did "sysctl > dev.xnb.0.unit_test_results" implicitly for each xnb interface, thus the > extra output, since reading value actually runs tests. So now i upgraded my > monitoring command to 'sysctl -a -N'. Never did i expect that sysctl > variable reading could trigger test suite execution. > > I did not understand from comments though - how do you instantiate xnb > interface? > > "ifconfig xnb create" returned: > ifconfig: SIOCIFCREATE2: Invalid argument You need to create a guest to instantiate a xnb interface. Those cannot be created by ifconfig because they rely on a matching frontend. Roger.