On Saturday 17 December 2016 00:18:13 Marc Joliet wrote: > The initial results with btrfs-check's low-memory mode found > reference count mismatches, but that seems to have been a false positive, > since btrfs-check's normal mode does not find them. FWIW, just in case this wasn't known yet (I know lowmem mode is still considered experimental), here is the lowmem output from three runs, in order. (I don't have the exact dates, but the FS was mounted in-between each run over the course of about 24 hours.) # btrfs check --mode lowmem /dev/sdb2 Checking filesystem on /dev/sdb2 UUID: f97b3cda-15e8-418b-bb9b-235391ef2a38 checking extents ERROR: extent[3839195598848, 20480] referencer count mismatch (root: 31589, owner: 2688918, offset: 4927488) wanted: 3, have: 4 ERROR: extent[3839195598848, 20480] referencer count mismatch (root: 31614, owner: 2688918, offset: 4927488) wanted: 3, have: 4 ERROR: extent[3839195598848, 20480] referencer count mismatch (root: 31422, owner: 2688918, offset: 4927488) wanted: 2, have: 4 ERROR: extent[3840794644480, 655360] referencer count mismatch (root: 31422, owner: 494683, offset: 734683136) wanted: 6, have: 11 ERROR: extent[3840794644480, 655360] referencer count mismatch (root: 31579, owner: 494683, offset: 734683136) wanted: 2, have: 7 ^C # btrfs check --mode lowmem /dev/sdb2 [6/1151] Checking filesystem on /dev/sdb2 UUID: f97b3cda-15e8-418b-bb9b-235391ef2a38 checking extents ERROR: extent[3839195598848, 20480] referencer count mismatch (root: 31614, owner: 2688918, offset: 4927488) wanted: 3, have: 4 ERROR: extent[3839195598848, 20480] referencer count mismatch (root: 31422, owner: 2688918, offset: 4927488) wanted: 2, have: 4 ERROR: extent[3840794644480, 655360] referencer count mismatch (root: 31422, owner: 494683, offset: 734683136) wanted: 6, have: 11 ERROR: extent[3840794644480, 655360] referencer count mismatch (root: 31579, owner: 494683, offset: 734683136) wanted: 2, have: 7 ERROR: extent[3853952757760, 4096] referencer count mismatch (root: 31614, owner: 2688918, offset: 4935680) wanted: 1, have: 2 ERROR: extent[3855013117952, 32768] referencer count mismatch (root: 30188, owner: 494681, offset: 32219136) wanted: 1, have: 2 ERROR: extent[3855013117952, 32768] referencer count mismatch (root: 30819, owner: 494681, offset: 32219136) wanted: 1, have: 2 ERROR: extent[3855013117952, 32768] referencer count mismatch (root: 28250, owner: 494681, offset: 32219136) wanted: 1, have: 2 ERROR: extent[3855013117952, 32768] referencer count mismatch (root: 29175, owner: 494681, offset: 32219136) wanted: 1, have: 2 ERROR: extent[3855015211008, 57344] referencer count mismatch (root: 31614, owner: 494681, offset: 32366592) wanted: 1, have: 2 ERROR: extent[3855015211008, 57344] referencer count mismatch (root: 31538, owner: 494681, offset: 32366592) wanted: 1, have: 2 ERROR: extent[3855015211008, 57344] referencer count mismatch (root: 31579, owner: 494681, offset: 32366592) wanted: 1, have: 2 ERROR: extent[3855015211008, 57344] referencer count mismatch (root: 31466, owner: 494681, offset: 32366592) wanted: 1, have: 2 ERROR: extent[3855015211008, 57344] referencer count mismatch (root: 31540, owner: 494681, offset: 32366592) wanted: 1, have: 2 ERROR: extent[3856459112448, 770048] referencer count mismatch (root: 30819, owner: 494683, offset: 1430528000) wanted: 1, have: 10 ERROR: extent[3856582701056, 4096] referencer count mismatch (root: 31572, owner: 195432, offset: 83841024) wanted: 1, have: 0 ERROR: extent[3857416364032, 98304] referencer count mismatch (root: 31614, owner: 494683, offset: 735207424) wanted: 2, have: 3 ERROR: extent[3857416364032, 98304] referencer count mismatch (root: 31624, owner: 494683, offset: 735207424) wanted: 1, have: 3 ERROR: extent[3857658413056, 65536] referencer count mismatch (root: 29175, owner: 2261987, offset: 474120192) wanted: 1, have: 2 ERROR: extent[3861689466880, 40960] referencer count mismatch (root: 31383, owner: 1277577, offset: 12189696) wanted: 1, have: 2 ERROR: extent[3861689995264, 40960] referencer count mismatch (root: 31383, owner: 1277577, offset: 12320768) wanted: 1, have: 2 ERROR: extent[3861694464000, 32768] referencer count mismatch (root: 30904, owner: 1277577, offset: 4980736) wanted: 3, have: 10 ERROR: extent[3861694464000, 32768] referencer count mismatch (root: 30937, owner: 1277577, offset: 4980736) wanted: 3, have: 10 ERROR: extent[3861694464000, 32768] referencer count mismatch (root: 31570, owner: 1277577, offset: 4980736) wanted: 3, have: 10 ERROR: extent[3861694464000, 32768] referencer count mismatch (root: 31569, owner: 1277577, offset: 4980736) wanted: 3, have: 10 ERROR: extent[3861694464000, 32768] referencer count mismatch (root: 30910, owner: 1277577, offset: 4980736) wanted: 3, have: 10 ERROR: extent[3861694464000, 32768] referencer count mismatch (root: 30824, owner: 1277577, offset: 4980736) wanted: 3, have: 10 ERROR: extent[3861694464000, 32768] referencer count mismatch (root: 31044, owner: 1277577, offset: 4980736) wanted: 3, have: 10 ERROR: extent[3861694464000, 32768] referencer count mismatch (root: 31048, owner: 1277577, offset: 4980736) wanted: 3, have: 10 ERROR: extent[3861694464000, 32768] referencer count mismatch (root: 31363, owner: 1277577, offset: 4980736) wanted: 3, have: 10 ERROR: extent[3861698289664, 45056] referencer count mismatch (root: 30824, owner: 1277577, offset: 12845056) wanted: 3, have: 5 ERROR: extent[3861700083712, 40960] referencer count mismatch (root: 30824, owner: 1277577, offset: 13107200) wanted: 2, have: 3 ERROR: extent[3861711024128, 40960] referencer count mismatch (root: 30653, owner: 1277577, offset: 4063232) wanted: 4, have: 7 ERROR: extent[3861711024128, 40960] referencer count mismatch (root: 30629, owner: 1277577, offset: 4063232) wanted: 3, have: 7 ERROR: extent[3861711593472, 45056] referencer count mismatch (root: 30653, owner: 1277577, offset: 2228224) wanted: 1, have: 2 ERROR: extent[3861717663744, 49152] referencer count mismatch (root: 31570, owner: 1277577, offset: 3145728) wanted: 2, have: 4 ERROR: extent[3861717663744, 49152] referencer count mismatch (root: 31569, owner: 1277577, offset: 3145728) wanted: 2, have: 4 ERROR: extent[3861718708224, 45056] referencer count mismatch (root: 30653, owner: 1277577, offset: 3538944) wanted: 1, have: 8 ERROR: extent[3861719072768, 45056] referencer count mismatch (root: 30653, owner: 1277577, offset: 3801088) wanted: 5, have: 6 ERROR: extent[3861719748608, 45056] referencer count mismatch (root: 31570, owner: 1277577, offset: 4325376) wanted: 2, have: 7 ERROR: extent[3861719748608, 45056] referencer count mismatch (root: 31569, owner: 1277577, offset: 4325376) wanted: 2, have: 7 ERROR: extent[3861721608192, 40960] referencer count mismatch (root: 31570, owner: 1277577, offset: 4849664) wanted: 7, have: 8 ERROR: extent[3861721608192, 40960] referencer count mismatch (root: 31569, owner: 1277577, offset: 4849664) wanted: 7, have: 8 ERROR: extent[3861742219264, 40960] referencer count mismatch (root: 30904, owner: 1277577, offset: 5373952) wanted: 8, have: 10 ERROR: extent[3861742219264, 40960] referencer count mismatch (root: 30937, owner: 1277577, offset: 5373952) wanted: 8, have: 10 ERROR: extent[3861742219264, 40960] referencer count mismatch (root: 31570, owner: 1277577, offset: 5373952) wanted: 8, have: 10 ERROR: extent[3861742219264, 40960] referencer count mismatch (root: 31569, owner: 1277577, offset: 5373952) wanted: 8, have: 10 ERROR: extent[3861742219264, 40960] referencer count mismatch (root: 30910, owner: 1277577, offset: 5373952) wanted: 8, have: 10 ERROR: extent[3861742219264, 40960] referencer count mismatch (root: 30824, owner: 1277577, offset: 5373952) wanted: 8, have: 10 ERROR: extent[3861742219264, 40960] referencer count mismatch (root: 31044, owner: 1277577, offset: 5373952) wanted: 8, have: 10 ERROR: extent[3861742219264, 40960] referencer count mismatch (root: 31048, owner: 1277577, offset: 5373952) wanted: 8, have: 10 ERROR: extent[3861742219264, 40960] referencer count mismatch (root: 31363, owner: 1277577, offset: 5373952) wanted: 8, have: 10 ERROR: extent[3861811728384, 65536] referencer count mismatch (root: 30188, owner: 494681, offset: 51904512) wanted: 2, have: 3 ERROR: extent[3861811728384, 65536] referencer count mismatch (root: 31113, owner: 494681, offset: 51904512) wanted: 2, have: 3 ERROR: extent[3861849968640, 45056] referencer count mismatch (root: 30653, owner: 1277577, offset: 6160384) wanted: 5, have: 7 ERROR: extent[3861947879424, 49152] referencer count mismatch (root: 31660, owner: 494681, offset: 63864832) wanted: 1, have: 2 ERROR: extent[3861947879424, 49152] referencer count mismatch (root: 31579, owner: 494681, offset: 63864832) wanted: 1, have: 2 ERROR: extent[3861947879424, 49152] referencer count mismatch (root: 29175, owner: 494681, offset: 63864832) wanted: 1, have: 2 ERROR: extent[3862172643328, 49152] referencer count mismatch (root: 28250, owner: 494681, offset: 79257600) wanted: 1, have: 2 ERROR: extent[3862172643328, 49152] referencer count mismatch (root: 31422, owner: 494681, offset: 79257600) wanted: 1, have: 2 ERROR: extent[3862172643328, 49152] referencer count mismatch (root: 31113, owner: 494681, offset: 79257600) wanted: 1, have: 2 ERROR: extent[3862177021952, 40960] referencer count mismatch (root: 31614, owner: 494681, offset: 81608704) wanted: 1, have: 2 ERROR: extent[3862177021952, 40960] referencer count mismatch (root: 31579, owner: 494681, offset: 81608704) wanted: 1, have: 2 ERROR: extent[3862177021952, 40960] referencer count mismatch (root: 31466, owner: 494681, offset: 81608704) wanted: 1, have: 2 ERROR: extent[3862177816576, 32768] referencer count mismatch (root: 31422, owner: 494681, offset: 82059264) wanted: 1, have: 2 ERROR: extent[3862177816576, 32768] referencer count mismatch (root: 31113, owner: 494681, offset: 82059264) wanted: 1, have: 2 ERROR: extent[3862969823232, 28672] referencer count mismatch (root: 31510, owner: 213766, offset: 5021696) wanted: 1, have: 0 ERROR: extent[3863189831680, 155648] referencer count mismatch (root: 29175, owner: 494683, offset: 1419395072) wanted: 1, have: 6 ^C # btrfs check --mode lowmem /dev/sdb2 Checking filesystem on /dev/sdb2 UUID: f97b3cda-15e8-418b-bb9b-235391ef2a38 checking extents ERROR: extent[3839195598848, 20480] referencer count mismatch (root: 31614, owner: 2688918, offset: 4927488) wanted: 3, have: 4 ERROR: extent[3839195598848, 20480] referencer count mismatch (root: 31707, owner: 2688918, offset: 4927488) wanted: 3, have: 4 ERROR: extent[3839195598848, 20480] referencer count mismatch (root: 31422, owner: 2688918, offset: 4927488) wanted: 2, have: 4 ERROR: extent[3840794644480, 655360] referencer count mismatch (root: 31422, owner: 494683, offset: 734683136) wanted: 6, have: 11 ERROR: extent[3840794644480, 655360] referencer count mismatch (root: 31579, owner: 494683, offset: 734683136) wanted: 2, have: 7 ERROR: extent[3853952757760, 4096] referencer count mismatch (root: 31614, owner: 2688918, offset: 4935680) wanted: 1, have: 2 ERROR: extent[3853952757760, 4096] referencer count mismatch (root: 31707, owner: 2688918, offset: 4935680) wanted: 1, have: 2 ERROR: extent[3855013117952, 32768] referencer count mismatch (root: 30188, owner: 494681, offset: 32219136) wanted: 1, have: 2 ERROR: extent[3855013117952, 32768] referencer count mismatch (root: 30819, owner: 494681, offset: 32219136) wanted: 1, have: 2 ERROR: extent[3855013117952, 32768] referencer count mismatch (root: 28250, owner: 494681, offset: 32219136) wanted: 1, have: 2 ERROR: extent[3855013117952, 32768] referencer count mismatch (root: 29175, owner: 494681, offset: 32219136) wanted: 1, have: 2 ERROR: extent[3855015211008, 57344] referencer count mismatch (root: 31614, owner: 494681, offset: 32366592) wanted: 1, have: 2 ERROR: extent[3855015211008, 57344] referencer count mismatch (root: 31538, owner: 494681, offset: 32366592) wanted: 1, have: 2 ERROR: extent[3855015211008, 57344] referencer count mismatch (root: 31684, owner: 494681, offset: 32366592) wanted: 1, have: 2 ERROR: extent[3855015211008, 57344] referencer count mismatch (root: 31579, owner: 494681, offset: 32366592) wanted: 1, have: 2 ERROR: extent[3855015211008, 57344] referencer count mismatch (root: 31697, owner: 494681, offset: 32366592) wanted: 1, have: 2 ERROR: extent[3855015211008, 57344] referencer count mismatch (root: 31466, owner: 494681, offset: 32366592) wanted: 1, have: 2 ERROR: extent[3855015211008, 57344] referencer count mismatch (root: 31540, owner: 494681, offset: 32366592) wanted: 1, have: 2 ERROR: extent[3856388816896, 20480] referencer count mismatch (root: 31697, owner: 2688944, offset: 74829824) wanted: 1, have: 0 ERROR: extent[3856388816896, 20480] referencer count mismatch (root: 31714, owner: 2688944, offset: 74829824) wanted: 1, have: 0 ERROR: extent[3856459112448, 770048] referencer count mismatch (root: 30819, owner: 494683, offset: 1430528000) wanted: 1, have: 10 ERROR: extent[3856582701056, 4096] referencer count mismatch (root: 31572, owner: 195432, offset: 83841024) wanted: 1, have: 0 ^C -- Marc Joliet -- "People who think they know everything really annoy those of us who know we don't" - Bjarne Stroustrup
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