Bug in backend processing

[freddy33]

Looks like race condition.
`pathdb 2021/05/01 03:16:19 m3pathctxdb.go:408: [INFO PathDB104-GrowthCtx39-T4-Idx11-3-48 from=48 to=49 : move from 3,816 to 4,000 nodes with 0 conflicts]
pathdb 2021/05/01 03:16:19 m3pathctxdb.go:315: [INFO Path context PathDB104-GrowthCtx39-T4-Idx11-3-49 max dist set to 49]
m3server 2021/05/01 03:16:21 path_handler.go:93: [INFO Receive increaseMaxDist]
pathdb 2021/05/01 03:16:23 m3pathnodedb.go:167: [ERROR Linked id of &{17 [234,513 236,002 236,631] T008 T08: (CP01, CP02, CN04)} not set correctly for 2 since 236,631 != -3]
2021/05/01 03:16:23 [ERROR Linked id of &{17 [234,513 236,002 236,631] T008 T08: (CP01, CP02, CN04)} not set correctly for 2 since 236,631 != -3]
pathdb 2021/05/01 03:16:25 m3pathctxdb.go:408: [INFO PathDB120-GrowthCtx41-T8-Idx01-7-47 from=47 to=48 : move from 3,793 to 3,936 nodes with 0 conflicts]
pathdb 2021/05/01 03:16:25 m3pathctxdb.go:315: [INFO Path context PathDB120-GrowthCtx41-T8-Idx01-7-48 max dist set to 48]
m3server 2021/05/01 03:16:27 path_handler.go:93: [INFO Receive increaseMaxDist]
pathdb 2021/05/01 03:16:29 m3pathctxdb.go:408: [INFO PathDB104-GrowthCtx39-T4-Idx11-3-49 from=49 to=50 : move from 4,000 to 4,167 nodes with 0 conflicts]
pathdb 2021/05/01 03:16:29 m3pathctxdb.go:315: [INFO Path context PathDB104-GrowthCtx39-T4-Idx11-3-50 max dist set to 50]
m3server 2021/05/01 03:16:32 path_handler.go:93: [INFO Receive increaseMaxDist]
pathdb 2021/05/01 03:16:32 m3pathctxdb.go:408: [INFO PathDB111-GrowthCtx40-T8-Idx00-6-56 from=56 to=57 : move from 5,411 to 5,596 nodes with 0 conflicts]
pathdb 2021/05/01 03:16:32 m3pathctxdb.go:315: [INFO Path context PathDB111-GrowthCtx40-T8-Idx00-6-57 max dist set to 57]
pathdb 2021/05/01 03:16:35 m3pathnodedb.go:188: [ERROR Linked id for next of &{529 [234,513 236,002 -1] T008 T08: (CP01, CP02, CN04)} not set correctly for 2 since -1 != -5 && -1 <= 0]
panic: [ERROR Linked id for next of &{529 [234,513 236,002 -1] T008 T08: (CP01, CP02, CN04)} not set correctly for 2 since -1 != -5 && -1 <= 0]

goroutine 133199 [running]:
github.com/freddy33/qsm-go/m3util.(*BaseLogger).Fatalf(0xc000005b00, 0x15a931f, 0x4b, 0xc0031045a0, 0x5, 0x5)
C:/work/projects/qsm-go/m3util/qsm_log.go:269 +0xcb
github.com/freddy33/qsm-go/backend/pathdb.(*ConnectionsStateDb).GetLinkIdsForDb(0xc003b146e0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
C:/work/projects/qsm-go/backend/pathdb/m3pathnodedb.go:188 +0x554
github.com/freddy33/qsm-go/backend/pathdb.(*PathNodeDb).updateInDb(0xc003b146e0, 0x0, 0x0)
C:/work/projects/qsm-go/backend/pathdb/m3pathnodedb.go:359 +0x54
github.com/freddy33/qsm-go/backend/pathdb.(*PathNodeDb).syncInDb(0xc003b146e0, 0x0, 0x0)
C:/work/projects/qsm-go/backend/pathdb/m3pathnodedb.go:336 +0x75a
github.com/freddy33/qsm-go/backend/pathdb.(*PathContextDb).calculateNextMaxDist.func3(0x1fffffffb, 0x2d, 0xc003b146e0, 0x0)
C:/work/projects/qsm-go/backend/pathdb/m3pathctxdb.go:391 +0x59
github.com/freddy33/qsm-go/backend/pathdb.(*ServerPointHashPathNodeMap).Range.func1(0x1fffffffb, 0x2d, 0xc003b146e0, 0xc0043c3f84)
C:/work/projects/qsm-go/backend/pathdb/m3pathmap.go:124 +0x48
github.com/freddy33/qsm-go/model/m3point.(*PointHashMap).Range.func1(0x16287a0, 0xc004884850, 0xc003b146e0, 0x0)
C:/work/projects/qsm-go/model/m3point/m3pointmap.go:69 +0x7f
github.com/freddy33/qsm-go/model/m3point.(*NonBlockConcurrentMap).Range.func1(0xc0007e64e0, 0x0, 0xc004674b70, 0x1fa, 0xc00511c180)
C:/work/projects/qsm-go/model/m3point/nonblockmap.go:349 +0x133
created by github.com/freddy33/qsm-go/model/m3point.(*NonBlockConcurrentMap).Range
C:/work/projects/qsm-go/model/m3point/nonblockmap.go:332 +0x1e5
`