On Wed, Nov 5, 2008 at 6:25 PM, Theodore Tso <tytso@xxxxxxx> wrote: > > Based on some reflection and further discussion on #ext4, I have a > theory which we need to try to prove/disprove that it may be related > to memory pressure combined with the delayed allocation code. Jindrich Makovicka wrote: >The following testcase was used to trigger the infamous MAP_SHARED >dirty flag bug. Maybe it could be of some help here too: > >http://lkml.org/lkml/2006/12/27/180 Solofo.Ramangalahy wrote: >The test case triggers corruption with 2.6.28-rc3 + ext4 patch queue: . bunch of errors like > Chunk 71637 corrupted (0-1339) (2756-4095) > Expected 213, got 0 > with default mount. >. nodelalloc is ok. I also triggered the bug on my hardware (x86_64, with 2GB memory) while running Linus' test program with TARGETSIZE (1600 << 20). The symptoms are exactly the same as in the famous former bug, that Linus discovered. Here is an excerpt from the output: Writing chunk 1149123/1149124 (99%) Chunk 3 corrupted (0-1459) (111c-16cf) Expected 3, got 0 Written as (519444)1144595(687310) Chunk 15 corrupted (0-1459) (558c-5b3f) Expected 15, got 0 Written as (99887)645566(1121294) Chunk 16 corrupted (0-1215) (5b40-5fff) Expected 16, got 0 Written as (645566)1121294(920116) Chunk 26 corrupted (0-1459) (9448-99fb) Expected 26, got 0 Written as (361425)1122832(756521) Chunk 27 corrupted (0-1459) (99fc-9faf) Expected 27, got 0 Written as (1122832)756521(414420) Chunk 34 corrupted (0-1459) (c1e8-c79b) Expected 34, got 0 Written as (204725)934398(543959) Chunk 39 corrupted (404-1459) (e000-e41f) Expected 39, got 0 Written as (857308)1016367(413445) Chunk 60 corrupted (0-1459) (15630-15be3) Expected 60, got 0 Written as (218658)603309(105651) Chunk 84 corrupted (240-1459) (1e000-1e4c3) Expected 84, got 0 Written as (207103)982280(141982) Chunk 109 corrupted (604-1459) (27000-27357) Expected 109, got 0 Written as (415001)965566(309924) Chunk 114 corrupted (0-1459) (28a28-28fdb) Expected 114, got 0 Written as (420741)1107613(233665) Chunk 119 corrupted (0-1459) (2a6ac-2ac5f) Expected 119, got 0 Written as (576520)1013770(680816) Chunk 129 corrupted (0-1459) (2dfb4-2e567) Expected 129, got 0 Written as (272475)1136094(865523) Chunk 130 corrupted (0-1459) (2e568-2eb1b) Expected 130, got 0 Written as (1136094)865523(71027) Chunk 132 corrupted (0-1459) (2f0d0-2f683) Expected 132, got 0 Written as (71027)1087332(516188) Chunk 139 corrupted (0-1459) (318bc-31e6f) Expected 139, got 0 Written as (31550)1035248(265709) Chunk 141 corrupted (0-1459) (32424-329d7) Expected 141, got 0 Written as (265709)1039673(102047) Chunk 150 corrupted (0-1459) (35778-35d2b) Expected 150, got 0 Written as (499376)970317(736517) Chunk 168 corrupted (0-1459) (3be20-3c3d3) Expected 168, got 0 Written as (162733)1104408(467712) Chunk 199 corrupted (0-275) (46eec-46fff) Expected 199, got 0 Written as (277601)946981(262145) Chunk 212 corrupted (0-1459) (4b910-4bec3) Expected 212, got 0 Written as (72548)1090863(578882) -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
