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kern/54210: NetBSD-8 processes presumably not exiting



>Number:         54210
>Category:       kern
>Synopsis:       NetBSD-8 processes presumably not exiting
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu May 16 14:40:00 +0000 2019
>Originator:     Frank Kardel
>Release:        NetBSD 8.0_STABLE
>Organization:
>Environment:
System: NetBSD sf2 8.0_STABLE NetBSD 8.0_STABLE (GENERIC) #4: Wed Apr 24 15:54:41 CEST 2019 kardel@pip:/src/NetBSD/n8/src/obj.amd64/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:
	On a large memory (382Gb) machine / 16 CPU a postgresql 10 parallel restore (8 threads) does not terminate 
	2h after the work has finished.
	The stacktrace dump shows several processes in exit(2) stuck in the VM system.
	After "reboot"ing the system the DB shows all work committed - only the final exit(2) phase 
	of the processes seems to be an issue. The DB processes also have access to shared memory.
	We try to repeat the scenario to gather more trace information

begin 644 trace.txt.gz
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M92_6Q9JK,";A`9IIXB3+E7>%*,#\LRQ@Y)&B_C!#DM,G"V+!S$A.'R&GZE+=
M&3:("32(A2L0QV`.);\@S6.E"%-ZN=JN6MVXOPX-5"YS[9'L=)@024Y%H8IP
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MJB:34Y?]AIF<3#Z"?NTWT<WW.Y<,8DINYD8N]0W85$P^0D'I;Q,5<+28'%>F
M_'/U=*VQO_>%U*5$N,]EVX">"#<J:_*STOD`ZR!_2*H?4Y&9:\#XBQD?7_%]
MXOLN)2F<=YOZ>-N748_42#BSPH"%@8GG-RS$H%W105'O:HZE55J&]2]U6YTU
M&MG/;K$;8J07X5\N<@.DP"L4O.]ET/2UNUT>UP]RZ-,"1R[QHATBU'&%LEYT
MZWJ/_3IO:UV![B$5UY(7MGI#-$@<"JQJX<9^0&@(#&(%ZR91(RAWRVB/%$V@
9YGLG\=/,P<+;G(MP=RB+_P?8L5;\B8$!`,9^
`
end
>How-To-Repeat:
	Run NetBSD 8 on a 16 CPU/382 Gb machine loading a sizable DB into a postgresql 10 instance with 8 threads. Storage is NVME.
>Fix:
	n/a



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