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HP-UX: Session Hanging Indefinitely With Event "kfk: async disk IO" (Doc ID 2246456.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.2 to 12.2]
HP-UX Itanium


Sessions hang for many hours or indefinitely until it got killed manually.

The hang occurs randomly with wait event "kfk: async disk IO" on all 6 nodes of the RAC database without any particular pattern. The same hang occurs in single instance environment with ASM.


[Call stack like this on the hanging process:

Short stack dump:
ksedsts()+592<-ksdxfstk()+48<-ksdxcb()+3376<-sspuser()+688 <-<kernel<-_read_sys()+48<-_read()+224<-skgfospo()+608<-$cold_skgfrwat()+208 <-ksfdwtio()+1232<-ksfdwat_internal()+1072<-kfk_reap_ufs_async_io()+224
<-kfk_reap_ios_from_subsys()+192<-kfkClose()+1184<-kfddsClean()+288<-kfddpslutcb()+48<-kfupsReleaseAll()+480<-kfupsReleaseAll()+224 <-kfupsReleaseAll()+224<-kfupsReleaseAll()+224<-$cold_kfdNotify()+192
<-kscnfy()+1872<-ksuabt()+1008<-$cold_opidrv()+1344<-sou2o()+256 <-opimai_real()+352<-ssthrdmain()+608<-main()+336<-main_opd_entry()+80





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