kern/45413: unkillable process, uvmexp_anonget waiting for mtsleep

[apb%cequrux.com@localhost]

>Number:         45413
>Category:       kern
>Synopsis:       unkillable process, uvmexp_anonget waiting for mtsleep
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Oct 02 11:15:00 +0000 2011
>Originator:     Alan Barrett
>Release:        NetBSD 5.99.56
>Organization:
Not much
>Environment:
System: NetBSD 5.99.56
Architecture: i386
Machine: i386
>Description:
        Kernel is from -current as of 2011-09-29 00:00 UTC,
        plus revision 1.177 of uvm_page.c.

        Userland is older.

        Firefox was unresponsive, with the xulrunner-bin process
        stuck in state "parked".  I killed it with "kill 1083".

        Then it was stuck in state "anonget2".  Even "kill -9" did not
        kill it.

        Here's what little information I have collected.

$ ps -l -p 1083
   UID  PID PPID CPU PRI NI    VSZ    RSS WCHAN    STAT TTY       TIME COMMAND
 10001 1083    1   0  95  0 672760 458304 anonget2 DEl  ?   2862:18.67 (xulrunne

crash> ps | grep 1083
1083   260 3   0   1000000           cff55d20                    lwpwait
1083     4 3   3   1100000           cf9d1540                    anonget2

crash>  trace/a cf9d1540
trace: pid 1083 lid 4 at 0xd0faca9c
sleepq_block(0,0,c0c4d610,c0cd42a8,c2ec83c8,dccf4b90,d0facaec,c06c0546,c2ec83c8,cd88ea00)
 at c055e3db
mtsleep(c29c92f8,204,c0c4d610,0,cfa0ed80,0,0,c08d5700,d2b1c2a4,c0b5e0a8) at 
c0561232
uvmfault_anonget(d0facc60,dccf38bc,d264a330,8,92400001,d0facc80,100000,3,7,14001002)
 at c08cf8b0
uvm_fault_internal(d2b1c2a0,9ea38000,1,0,c06c06f7,cfa05998,cf9d1540,d0facd10,2dfc9000,96919000)
 at c08d098b
trap() at c083ba18
--- trap (number 6) ---
bb39fd76:

crash> trace/a cff55d20
trace: pid 1083 lid 260 at 0xcf7629dc
sleepq_block(0,0,c0bf4870,c0cd3530,0,d0f18ed0,78a5b063,be2cff3d,cd88ed40,cf762a08)
 at c055e3db
cv_wait(cff19048,d2fb1e00,0,c0d104b4,cd888b80,c0101173,96,d03692a0,0,cf762ad0) 
at c0533029
lwp_wait1(cff55d20,0,cf762ad0,1,0,0,cf762acc,c07dde68,cd87af10,cff55ef0) at 
c0548411
exit_lwps(cff55d20,db8a24d0,cf762b3c,c47869f0,ceba9404,0,cf762b2c,cd881000,cfdf4e18,11)
 at c053ead8
exit1(cff55d20,f,cf762bcc,c055b199,d2fb1e00,1,0,c055ae71,cd887480,2) at c053f4e2
sigexit(cff55d20,f,f,0,fffebeff,ffffffff,cf762c3c,104,f55d20,cff55eb8) at 
c055d1ee
postsig(f,0,0,f,fffffffb,0,43b,2711,0,0) at c055d54a
lwp_userret(cff55d20,cf762cf4,cf762d1c,0,2dfc9000,cff492d0,0,cf762da0,2dfc9000,cdf020c0)
 at c0547979
syscall(cf762d48,bbbe00b3,1f00ab,bfbf0023,ba140023,a3b2aef4,f,9b9ff60c,ba1475b4,0)
 at c08075bf

>How-To-Repeat:
        See above
>Fix:
        Unknown