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kern/55559: radixtree panic



>Number:         55559
>Category:       kern
>Synopsis:       radixtree panic
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Aug 10 09:10:00 +0000 2020
>Originator:     Patrick Welche
>Release:        NetBSD-9.99.69/amd64
>Organization:
>Environment:
>Description:
Originally reported in

http://mail-index.netbsd.org/current-users/2020/08/05/msg039312.html

(gdb) target kvm netbsd.0.core   
0xffffffff80222535 in cpu_reboot (howto=howto@entry=260, 
    bootstr=bootstr@entry=0x0) at ../../../../arch/amd64/amd64/machdep.c:713
713                     dumpsys(); 
(gdb) bt   
#0  0xffffffff80222535 in cpu_reboot (howto=howto@entry=260,
    bootstr=bootstr@entry=0x0) at ../../../../arch/amd64/amd64/machdep.c:713
#1  0xffffffff8062750a in kern_reboot (howto=howto@entry=260,
    bootstr=bootstr@entry=0x0) at ../../../../kern/kern_reboot.c:73
#2  0xffffffff80657570 in vpanic (fmt=fmt@entry=0xffffffff809397d0 "trap",
    ap=ap@entry=0xffffa9814eb90ac8) at ../../../../kern/subr_prf.c:290
#3  0xffffffff80657634 in panic (fmt=fmt@entry=0xffffffff809397d0 "trap")
    at ../../../../kern/subr_prf.c:209
#4  0xffffffff80224b6b in trap (frame=0xffffa9814eb90c10)
    at ../../../../arch/amd64/amd64/trap.c:326
#5  0xffffffff8021da35 in alltraps ()
#6  0xffffffff807596d5 in radix_tree_lookup_ptr (tagmask=0, alloc=false,
    path=0xffffa9814eb90d00, idx=10, t=0xffff84733b57b1d8)
    at     
+../../../../../../lib/libkern/../../../common/lib/libc/gen/radixtree.c:557
#7  radix_tree_clear_tag (t=t@entry=0xffff84733b57b1d8, idx=idx@entry=10,
    tagmask=tagmask@entry=1)
    at 
+../../../../../../lib/libkern/../../../common/lib/libc/gen/radixtree.c:1113
#8  0xffffffff805f2f42 in uvm_pagemarkdirty (pg=pg@entry=0xffffa98005772880,
    newstatus=newstatus@entry=1) at ../../../../uvm/uvm_page_status.c:109
#9  0xffffffff805f44a8 in uvmpd_scan_queue ()
    at ../../../../uvm/uvm_pdaemon.c:752
#10 uvmpd_scan () at ../../../../uvm/uvm_pdaemon.c:900
#11 uvm_pageout (arg=<optimized out>) at ../../../../uvm/uvm_pdaemon.c:316
#12 0xffffffff802086f7 in lwp_trampoline ()


reminds me of PR 55493 which was on a different box

>How-To-Repeat:

>Fix:



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