Date: Wed, 09 Dec 2015 10:47:52 -0500 From: "Michael B. Eichorn" <ike@michaeleichorn.com> To: Jan Bramkamp <crest@rlwinm.de>, freebsd-stable@freebsd.org Subject: Re: Periodic jobs triggering panics in 10.1 and 10.2 Message-ID: <1449676072.2727.8.camel@michaeleichorn.com> In-Reply-To: <56680148.9070601@rlwinm.de> References: <34FA7D40-8758-460D-AC14-20B21D2E3F8D@ebureau.com> <1449619470.31831.9.camel@michaeleichorn.com> <56680148.9070601@rlwinm.de>
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[-- Attachment #1 --] On Wed, 2015-12-09 at 11:24 +0100, Jan Bramkamp wrote: > > On 09/12/15 01:04, Michael B. Eichorn wrote: > > On Tue, 2015-12-08 at 16:31 -0600, Dustin Wenz wrote: > > > I suspect this is a zfs bug that is triggered by the access > > > patterns > > > in the periodic scripts. There is significant load on the system > > > when > > > the scheduled processes start, because all jails execute the same > > > scripts at the same time. > > > > > > I've been able to alleviate this problem by disabling the > > > security > > > scans within the jails, but leave it enabled on the root host. > > > > To avoid the problem of jails all starting things at the same time, > > use > > the cron(8) flags -j and -J to set a 'jitter' which will cause cron > > to > > sleep for a random period of specified duration (60 sec max). Cron > > flags can be set using the rc.conf variable 'cron_flags'. > > While jitter would reduce the resource contention a thundering herd > of > cronjobs shouldn't cause the kernel to divide by zero. Spreading the > load by introducing jitter to cronjobs might hide the problem, but it > still needs further analysis. I concur, used the word 'avoid' in the sense that this was an improvement to his work-around (which is all that I quoted). I had no intent to imply that it was the solution to the bug, which of course deserves solving. Sorry for any confusion, I will try to be more clear in the future. [-- Attachment #2 --] 0 *H 010 `He 0 *H 000]0 *H 01 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1806U/StartCom Class 1 Primary Intermediate Client CA0 150613202446Z 160614003550Z0H1 0 U ike@michaeleichorn.com1%0# *H ike@michaeleichorn.com0"0 *H 0 UՀ,k9D %Z|Y6J<rrK g;&|uNlUE9)V.[ט̊:qS](#v SYDz* CpugYݔ,v<`j(w aS#ڒ6n(K5'KVLåErv< J=[}W bLA%gޭnVb| I?M7D :$׃bM_T[,ƃ\ 00 U 0 0 U 0 U %0++0 U jj: γ+39啖0 U #0Sr풜\|~5NԸQ0!U 0ike@michaeleichorn.com0LU C0?0; +70*0.+"http://www.startssl.com/policy.pdf0+00' StartCom Certification Authority0This certificate was issued according to the Class 1 Validation requirements of the StartCom CA policy, reliance only for the intended purpose in compliance of the relying party obligations.06U /0-0+)'%http://crl.startssl.com/crtu1-crl.crl0+009+0-http://ocsp.startssl.com/sub/class1/client/ca0B+06http://aia.startssl.com/certs/sub.class1.client.ca.crt0#U 0http://www.startssl.com/0 *H x+ȐF}pw.X vF?rg P]EOp)L˻yA ;hi0u2]m [Sbp$_ gr Xm*YP3 #H>mKAǠt)HO|=@} 3ӝ'iO81> 03 v'h5U "H;ECZtpҗ4rWHu^6+i*kJL8shAV|5;?HMc\ j[j|+000]0 *H 01 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1806U/StartCom Class 1 Primary Intermediate Client CA0 150613202446Z 160614003550Z0H1 0 U ike@michaeleichorn.com1%0# *H ike@michaeleichorn.com0"0 *H 0 UՀ,k9D %Z|Y6J<rrK g;&|uNlUE9)V.[ט̊:qS](#v SYDz* CpugYݔ,v<`j(w aS#ڒ6n(K5'KVLåErv< J=[}W bLA%gޭnVb| I?M7D :$׃bM_T[,ƃ\ 00 U 0 0 U 0 U %0++0 U jj: γ+39啖0 U #0Sr풜\|~5NԸQ0!U 0ike@michaeleichorn.com0LU C0?0; +70*0.+"http://www.startssl.com/policy.pdf0+00' StartCom Certification Authority0This certificate was issued according to the Class 1 Validation requirements of the StartCom CA policy, reliance only for the intended purpose in compliance of the relying party obligations.06U /0-0+)'%http://crl.startssl.com/crtu1-crl.crl0+009+0-http://ocsp.startssl.com/sub/class1/client/ca0B+06http://aia.startssl.com/certs/sub.class1.client.ca.crt0#U 0http://www.startssl.com/0 *H x+ȐF}pw.X vF?rg P]EOp)L˻yA ;hi0u2]m [Sbp$_ gr Xm*YP3 #H>mKAǠt)HO|=@} 3ӝ'iO81> 03 v'h5U "H;ECZtpҗ4rWHu^6+i*kJL8shAV|5;?HMc\ j[j|+040 0 *H 0}1 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1)0'U StartCom Certification Authority0 071024210155Z 171024210155Z01 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1806U/StartCom Class 1 Primary Intermediate Client CA0"0 *H 0 -).2AUGo#G B|NDRpM-B=o -we5JQpa>O.#._<V [~**pz~3WG .ᘟMlr[<Ce6fqO"uxfWN#uicgkv$Lb%y`_{`xK'GN 00U 00U 0 U Sr풜\|~5NԸQ0 U #0N @[i04hCA0f+Z0X0'+0http://ocsp.startssl.com/ca0-+0!http://www.startssl.com/sfsca.crt0[U T0R0'%#!http://www.startssl.com/sfsca.crl0'%#!http://crl.startssl.com/sfsca.crl0U y0w0u +70f0.+"http://www.startssl.com/policy.pdf04+(http://www.startssl.com/intermediate.pdf0 *H }x,\c^ #wMq}>UK/^yX֏y frMIŲB61ymQҨݬZ0& ;@#13qۑ& ̢o 6r_;GO>*I( 74XS1r3)!LJy6Kotˆ# _wSr ;B ADp(fs 䰷6%.W0J3:bC<8t X1<Cn=t==wST~\wkBf|15zUP)(IjVB!OfI=bb\4-*em/нSJm7N[]'@ڽ D9Kr>R7/|o^I@ټ'Pa $ z9a'L)( I}vcH]۸D*W} m>Q|C.(,lQ10{001 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1806U/StartCom Class 1 Primary Intermediate Client CA]0 `He 0 *H 1 *H 0 *H 1 151209154752Z0/ *H 1" BӷW- `%6ϛ^Q^70 +71001 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1806U/StartCom Class 1 Primary Intermediate Client CA]0 *H 101 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1806U/StartCom Class 1 Primary Intermediate Client CA]0 *H I[ĮjRϊpK D 4-| ZF㤺ѼU.tk{@oDom`Erؖ'H`&,(r38DomQv pߏ# ᶡmOO8 oz# BH䑛>6h̴; 3 +*ЁoѶ ^H~c_,"Pmwwi*r PM N -/ߘ@4?Vp
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