(ITS#8336) assert(NUMKEYS(mp) > 1) in mdb_page_search_root()

[h.b.furuseth@usit.uio.no]

Full_Name: Hallvard B Furuseth
Version: LMDB 0.9.17
OS: Linux x86_64
URL: 
Submission from: (NULL) (129.240.203.186)
Submitted by: hallvard


$ mtest_rand -c0 -i10000 -p0x100 -r562822527.3 -w
// Options for replay: [-v] -c0 -i10000 -p0x100 -r562822527.3 -w
../mdb.c:5276: Assertion 'NUMKEYS(mp) > 1' failed in mdb_page_search_root()
Aborte%2(core dumped)

Broken by 4b01cb3 "ITS#8221 don't merge branch pages needlessly"
according to git bisect.