Index: src/test_devsym.c
==================================================================
--- src/test_devsym.c
+++ src/test_devsym.c
@@ -503,10 +503,11 @@
   }
 }
 
 void devsym_unregister(){
   sqlite3_vfs_unregister(&devsym_vfs);
+  sqlite3_vfs_unregister(&writecrash_vfs);
   g.pVfs = 0;
   g.iDeviceChar = 0;
   g.iSectorSize = 0;
 }
 

Index: test/permutations.test
==================================================================
--- test/permutations.test
+++ test/permutations.test
@@ -964,11 +964,11 @@
 } -files [test_set $::allquicktests -exclude {
   wal* incrvacuum.test ioerr.test corrupt4.test io.test crash8.test 
   async4.test bigfile.test backcompat.test e_wal* fstat.test mmap2.test
   pager1.test syscall.test tkt3457.test *malloc* mmap* multiplex* nolock*
   pager2.test *fault* rowal* snapshot* superlock* symlink.test
-  delete_db.test shmlock.test
+  delete_db.test shmlock.test chunksize.test
 }]
 
 if {[info commands register_demovfs] != ""} {
   test_suite "demovfs" -description {
     Check that the demovfs (code in test_demovfs.c) more or less works.