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Thread-Topic: ktrace on NFSroot failing? 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dkim=pass header.d=uoguelph.ca header.s=selector2 header.b=ZFej53W7; arc=pass ("microsoft.com:s=arcselector9901:i=1"); dmarc=pass (policy=none) header.from=uoguelph.ca; spf=pass (mx1.freebsd.org: domain of rmacklem@uoguelph.ca designates 40.107.66.71 as permitted sender) smtp.mailfrom=rmacklem@uoguelph.ca X-Spamd-Result: default: False [-5.00 / 15.00]; TO_DN_EQ_ADDR_SOME(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[uoguelph.ca:s=selector2]; FREEFALL_USER(0.00)[rmacklem]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:40.107.0.0/16]; MIME_GOOD(-0.10)[text/plain]; NEURAL_HAM_LONG(-1.00)[-1.000]; DWL_DNSWL_LOW(-1.00)[uoguelph.ca:dkim]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[uoguelph.ca:+]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[40.107.66.71:from]; NEURAL_HAM_SHORT(-1.00)[-1.000]; RWL_MAILSPIKE_POSSIBLE(0.00)[40.107.66.71:from]; MLMMJ_DEST(0.00)[freebsd-current]; DMARC_POLICY_ALLOW(-0.50)[uoguelph.ca,none]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; SUBJECT_ENDS_QUESTION(1.00)[]; ASN(0.00)[asn:8075, ipnet:40.104.0.0/14, country:US]; RCVD_TLS_LAST(0.00)[]; ARC_ALLOW(-1.00)[microsoft.com:s=arcselector9901:i=1] X-ThisMailContainsUnwantedMimeParts: N John Baldwin wrote:=0A= > On 3/10/22 8:14 AM, Mateusz Guzik wrote:=0A= >> On 3/10/22, Bjoern A. Zeeb wrote:=0A= >>> Hi,=0A= >>>=0A= >>> I am having a weird issue with ktrace on an nfsroot machine:=0A= >>>=0A= >>> root:/tmp # ktrace sleep 1=0A= >>> root:/tmp # kdump=0A= >>> -559038242 Events dropped.=0A= >>> kdump: bogus length 0xdeadc0de=0A= >>>=0A= >>> Anyone seen something like this before?=0A= >>>=0A= >>=0A= >> I just did a quick check and it definitely fails on nfs mounts:=0A= >> # ktrace pwd=0A= >> /root/mjg=0A= >> # kdump=0A= >> -559038242 Events dropped.=0A= >> kdump: bogus length 0xdeadc0de=0A= >>=0A= >> I don't have time to look into it this week though.=0A= I have committed the patch (that was attached to a previous email)=0A= to main, since bz@ confirmed via email that it fixed the ktrace problem=0A= for him.=0A= =0A= >Possibly related: core dumps are no longer working for me on NFS=0A= >mounts. I get a 0 byte foo.core instead of a valid core dump.=0A= If core dumps still fail for a main with the patch, please let us know,=0A= so we can investigate further.=0A= =0A= Thanks and sorry for the breakage, rick=0A= =0A= --=0A= John Baldwin=0A=