Date: Thu, 09 Mar 2017 10:43:14 +0100 From: Alexandre Martins <alexandre.martins@stormshield.eu> To: freebsd-current <freebsd-current@freebsd.org> Subject: smp_rendezvous_action: Are atomics correctly used ? Message-ID: <2092905.6A8RAGlt18@pc-alex>
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[-- Attachment #1 --] Hello, I'm curently reading the code of the function smp_rendezvous_action, in kern/subr_smp.c file. In that function, i see that the variable smp_rv_waiters is read in some while() loop in a non-atomic way. https://svnweb.freebsd.org/base/head/sys/kern/subr_smp.c?view=annotate#l412 https://svnweb.freebsd.org/base/head/sys/kern/subr_smp.c?view=annotate#l458 https://svnweb.freebsd.org/base/head/sys/kern/subr_smp.c?view=annotate#l472 I suspect one of my freeze to be due by that. Should this function be patched to use "atomic_load_acq_int(&smp_rv_waiters[])" ? Best regards -- Alexandre Martins STORMSHIELD [-- Attachment #2 --] 0 *H 010 `He 0 *H 00n 0 *H 0H1 0 UFR10U STORMSHIELD1#0!U Stormshield Root Authority0 140904150710Z 240901150710Z0I1 0 UFR10U STORMSHIELD1$0"U Stormshield Users Authority0"0 *H 0 X6[t. D Uge0-2;h@eȻClΫp B# M,FY=.{ya{2πߢ 7 <d~O;ޅԋ&C 8ُ6@CXX>|abqenmI, O&'۰@%OhW& {52D%_8#f]G0ct y \ v0t0 U ml||uu4[ׁ0 U #0BgDaP0U 00U 0 `HB0 *H N9-؞>m-K!M-7zD6IZʾr>q? u ?xr6_'NջZ7]V\5Y&) )m@~^Qdp/H3ͦ` o⬋U,z,0Bdp!C2K8.r>0-1!C%3U2ϠMg~3 ͟wͲAZ&vF/BA$_ڀV! s7)=-nP> qH~g/Rs,PAJVm#QXJo */V|s Ŀj~y߽j 3]v3ƌqe`Y|HB3lC!^J2$4A`Z+( 7b{e˄wʈ<L=6[3`>IQF aiܝ ?:_yԊ / `0W0? (˻0 *H 0I1 0 UFR10U STORMSHIELD1$0"U Stormshield Users Authority0 160901151108Z 170901151108Z0p1 0 UFR10U STORMSHIELD10U Alexandre MARTINS1/0- *H alexandre.martins@stormshield.eu0"0 *H 0 ~ {x~;#3BgXC[rSVuv#>aL0w}""v`B)Db8qHkH\d qB6rd|:%Ze[wi3)$! hXε< صVO}# EjJe gk0%L퉬Q'b}3"*(_ T- w?gR H,\aWO4Ǘ Y3TR(Wn7Sv1n8xIan 00 U D0IM_W]A$v#<0 U #0ml||uu4[ׁ0 U 0 0U 0 `HB0 U %0++0JU C0A0?=;9https://pki.netasq.com/auth/certificaterevocationlist.crl0U 00U 0+U $0" alexandre.martins@stormshield.eu0 *H 5hhN ̛U92+ E jr@|f{`J2X!ȳ.ڤ|^*$"vlHtSeeAܟ-bC$*)Ж WJL >5@|N%·%{i-4akG앏]%.ݤp]7B/ *1WE@ zZoq@fk0NpHObD $9jXḓSk~LKX100R0I1 0 UFR10U STORMSHIELD1$0"U Stormshield Users Authority (˻0 `He 0 *H 1 *H 0 *H 1 170309094314Z0( *H 100 `He0 *H 0/ *H 1" I\Ƥcjr\1PPU<D0 *H aYֲAQT6Y̞ mA+T9wyҴojk`:> L 돤5ڸY7Q[RXP㣎6 x0R!fo PLՍd Og!2;32T$g {Өhw KAu<U4{HG W\p8Q͓BIjIiC5u vpw\7u6$VuBNg"[ ;help
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