wcfs: tests: Add test do demonstrate "at out of bounds" crash on readPinWatchers -> ΔFtail.BlkRevAt
The codepath that sends pin messages to watchers on FUSE READ, similarly to what was showed in 339f1884 is also vulnerable to "at out of bounds" panic if at=ΔFtail.tail: wcfs_test.py::test_wcfs_crash_old_data ---------------- live log call ----------------- WARNING ZODB.FileStorage:FileStorage.py:413 Ignoring index for /tmp/testdb_fs.nbSKXu/1.fs M: commit -> @at0 (03e5a31e5e5ef6bb) M: commit -> @at1 (03e5a31e5e63fa77) M: f<0000000000000002> [0] INFO wcfs:__init__.py:293 starting for file:///tmp/testdb_fs.nbSKXu/1.fs ... I0120 16:50:22.136098 697106 wcfs.go:2393] start "/dev/shm/wcfs/93026d44ef96f87df2cc0e2e451c5aabee91b652" "file:///tmp/testdb_fs.nbSKXu/1.fs" I0120 16:50:22.136127 697106 wcfs.go:2399] (built with go1.17.6) W0120 16:50:22.136233 697106 storage.go:152] zodb: FIXME: open file:///tmp/testdb_fs.nbSKXu/1.fs: raw cache is not ready for invalidations -> NoCache forced INFO wcfs:__init__.py:334 started pid697106 @ /dev/shm/wcfs/93026d44ef96f87df2cc0e2e451c5aabee91b652 C: setup watch f<0000000000000002> @at1 (03e5a31e5e63fa77) # pinok: {} panic: at out of bounds: at: @03e5a31e5e63fa77, (tail, head] = (@03e5a31e5e63fa77, @03e5a31e5e63fa77] goroutine 7 [running]: lab.nexedi.com/nexedi/wendelin.core/wcfs/internal/zdata.panicf(...) /home/kirr/src/neo/src/lab.nexedi.com/nexedi/wendelin.core/wcfs/internal/zdata/misc.go:47 lab.nexedi.com/nexedi/wendelin.core/wcfs/internal/zdata.(*ΔFtail).BlkRevAt(0xc0000a5d40, {0x969718, 0xc000076140}, 0xc0001a22a0, 0xc0001c0200, 0x3e5a31e5e63fa77) /home/kirr/src/neo/src/lab.nexedi.com/nexedi/wendelin.core/wcfs/internal/zdata/δftail.go:1077 +0xa45 main.(*BigFile).readPinWatchers(0xc0001d0200, {0x969718, 0xc000076140}, 0x0, 0xffffffffffffffff) /home/kirr/src/neo/src/lab.nexedi.com/nexedi/wendelin.core/wcfs/wcfs.go:1559 +0x2a5 main.(*BigFile).readBlk(0xc0001d0200, {0x969718, 0xc000076140}, 0x0, {0xc000320000, 0x200000, 0x0}) /home/kirr/src/neo/src/lab.nexedi.com/nexedi/wendelin.core/wcfs/wcfs.go:1281 +0x4d2 main.(*BigFile).Read.func1({0x969718, 0xc000076140}) /home/kirr/src/neo/src/lab.nexedi.com/nexedi/wendelin.core/wcfs/wcfs.go:1223 +0x71 lab.nexedi.com/kirr/go123/xsync.(*WorkGroup).Go.func1() /home/kirr/src/neo/src/lab.nexedi.com/kirr/go123/xsync/xsync.go:86 +0x68 created by lab.nexedi.com/kirr/go123/xsync.(*WorkGroup).Go /home/kirr/src/neo/src/lab.nexedi.com/kirr/go123/xsync/xsync.go:83 +0x92 >>> Change history by file: f<0000000000000002>: 0 1 2 3 4 5 6 7 a b c d e f g h @at0 (03e5a31e5e5ef6bb) @at1 (03e5a31e5e63fa77) 0 ... @func def test_wcfs_crash_old_data(): # start wcfs with ΔFtail/ΔBtail not covering that initial data. t = tDB(old_data=[{0:'a'}]); zf = t.zfile; at1 = t.head defer(t.close) f = t.open(zf) # ΔFtail coverage is currently (at1,at1] wl = t.openwatch() wl.watch(zf, at1, {}) # wcfs is crashing on readPinWatcher -> ΔFtail.BlkRevAt with # "at out of bounds: at: @at1, (tail,head] = (@at1,@at1] # because BlkRevAt(at=tail) query was disallowed. > f.assertBlk(0, 'a') # [0] becomes tracked Still also crashing in test_wcfs_watch_setup.
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