I tested btrfs under kmemcheck, and kmemcheck reports reads from unitialized memory on basically all operations on a freshly created btrfs filesystem (of course it's not unlikely it's the same uninitialized variable all over). Here are the first backtraces: device fsid 7f482de1f5b1f190-23f339b9880797be devid 1 transid 7 /dev/loop0 WARNING: kmemcheck: Caught 64-bit read from uninitialized memory (ffff880100210250) 14001400423f0500d23f0101ef3f01016904ebff7804ebff3c3e0200ef3f0101 u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u ^ Pid: 5892, comm: mount Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire 5810T/Aspire 5810T RIP: 0010:[<ffffffff81229ed8>] [<ffffffff81229ed8>] btrfs_alloc_inode+0x168/0x1e0 RSP: 0018:ffff88010cb33b88 EFLAGS: 00010246 RAX: ffff880100210220 RBX: ffff880100210000 RCX: 0000000000000000 RDX: ffffffff824b7948 RSI: ffffffff8178d722 RDI: ffffffff824b7948 RBP: ffff88010cb33ba8 R08: 0000000000000008 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff880100210310 R13: ffff8801002104f0 R14: ffff880100203000 R15: ffff880100207000 FS: 00007f8183f9a7e0(0000) GS:ffff880002800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8801002073f0 CR3: 0000000109584000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [<ffffffff811438c2>] alloc_inode+0x22/0xa0 [<ffffffff81143cc8>] new_inode+0x28/0xc0 [<ffffffff81225934>] open_ctree+0x244/0x17a0 [<ffffffff81207d4f>] btrfs_get_sb+0x30f/0x410 [<ffffffff8112cb65>] vfs_kern_mount+0x65/0x150 [<ffffffff8112ccbd>] do_kern_mount+0x4d/0x130 [<ffffffff81148d76>] do_mount+0x2c6/0x880 [<ffffffff811493bb>] sys_mount+0x8b/0xe0 [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff WARNING: kmemcheck: Caught 8-bit read from uninitialized memory (ffff880116d8d4e0) 0000000000000000010000000000000000647c270188ffff0000400200000000 u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u ^ Pid: 4160, comm: gvfs-gdu-volume Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire 5810T/Aspire 5810T RIP: 0010:[<ffffffff81217922>] [<ffffffff81217922>] btrfs_alloc_free_block+0x232/0x330 RSP: 0018:ffff88012aaddb18 EFLAGS: 00010202 RAX: 0000000000000011 RBX: ffff880116d8d4c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88012aaddc19 RDI: ffff880116d8d4d1 RBP: ffff88012aaddba8 R08: 0000000000000000 R09: ffff880116c604c0 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88010e72d700 R13: 0000000000000000 R14: ffff88010ac28000 R15: 0000000000000040 FS: 00007f2d82ae37a0(0000) GS:ffff880002800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88010ac28030 CR3: 0000000130507000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [<ffffffff8120cf36>] __btrfs_cow_block+0x136/0x5b0 [<ffffffff8120daa1>] btrfs_cow_block+0xf1/0x1d0 [<ffffffff81210156>] btrfs_search_slot+0x1b6/0x820 [<ffffffff81221c1a>] btrfs_lookup_inode+0x2a/0xa0 [<ffffffff8122cf29>] btrfs_update_inode+0x59/0x100 [<ffffffff8122ed56>] btrfs_dirty_inode+0x66/0x120 [<ffffffff8114e276>] __mark_inode_dirty+0x36/0x170 [<ffffffff811420dd>] touch_atime+0x12d/0x180 [<ffffffff8113c3ee>] vfs_readdir+0xbe/0xd0 [<ffffffff8113c564>] sys_getdents+0x84/0xf0 [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff WARNING: kmemcheck: Caught 8-bit read from uninitialized memory (ffff88013c101cc8) c0d4d8160188ffffffffffff92000000c00000000188ffff00987e270188ffff i i i i i i i i u u u u u u u u u u u u u u u u u u u u u u u u ^ Pid: 4160, comm: gvfs-gdu-volume Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire 5810T/Aspire 5810T RIP: 0010:[<ffffffff81262bbd>] [<ffffffff81262bbd>] add_delayed_ref_head+0x5d/0x120 RSP: 0018:ffff88012aadda68 EFLAGS: 00010206 RAX: 0000000000000001 RBX: ffff88013c101c00 RCX: 0000000000001000 RDX: 0000000001c06000 RSI: 0000000000000001 RDI: ffff88010ac28000 RBP: ffff88012aadda88 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: ffff88010ac28000 R13: ffff880116cd2000 R14: 0000000000001000 R15: 0000000001c06000 FS: 00007f2d82ae37a0(0000) GS:ffff880002800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88010ac28030 CR3: 0000000130507000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [<ffffffff81262e6f>] btrfs_add_delayed_tree_ref+0xdf/0x230 [<ffffffff81217957>] btrfs_alloc_free_block+0x267/0x330 [<ffffffff8120cf36>] __btrfs_cow_block+0x136/0x5b0 [<ffffffff8120daa1>] btrfs_cow_block+0xf1/0x1d0 [<ffffffff81210156>] btrfs_search_slot+0x1b6/0x820 [<ffffffff81221c1a>] btrfs_lookup_inode+0x2a/0xa0 [<ffffffff8122cf29>] btrfs_update_inode+0x59/0x100 [<ffffffff8122ed56>] btrfs_dirty_inode+0x66/0x120 [<ffffffff8114e276>] __mark_inode_dirty+0x36/0x170 [<ffffffff811420dd>] touch_atime+0x12d/0x180 [<ffffffff8113c3ee>] vfs_readdir+0xbe/0xd0 [<ffffffff8113c564>] sys_getdents+0x84/0xf0 [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff WARNING: kmemcheck: Caught 8-bit read from uninitialized memory (ffff88012762bbd2) 8804c581ffffffff010000000000000001507781ffffffff0000000000000000 u u u u u u u u i i i i u u u u i u u u u u u u u u u u u u u u ^ Pid: 4160, comm: gvfs-gdu-volume Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire 5810T/Aspire 5810T RIP: 0010:[<ffffffff8126297d>] [<ffffffff8126297d>] add_delayed_tree_ref+0x3d/0xe0 RSP: 0018:ffff88012aadda68 EFLAGS: 00010246 RAX: 0000000000000001 RBX: ffff88012762bba0 RCX: 0000000000001000 RDX: 0000000001c06000 RSI: 0000000000000003 RDI: ffff88010ac28000 RBP: ffff88012aadda88 R08: 0000000000000000 R09: 0000000000000005 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88010ac28000 R13: ffff88012762bba0 R14: ffff880116cd2000 R15: 0000000001c06000 FS: 00007f2d82ae37a0(0000) GS:ffff880002800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88010ac28030 CR3: 0000000130507000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [<ffffffff81262e9d>] btrfs_add_delayed_tree_ref+0x10d/0x230 [<ffffffff81217957>] btrfs_alloc_free_block+0x267/0x330 [<ffffffff8120cf36>] __btrfs_cow_block+0x136/0x5b0 [<ffffffff8120daa1>] btrfs_cow_block+0xf1/0x1d0 [<ffffffff81210156>] btrfs_search_slot+0x1b6/0x820 [<ffffffff81221c1a>] btrfs_lookup_inode+0x2a/0xa0 [<ffffffff8122cf29>] btrfs_update_inode+0x59/0x100 [<ffffffff8122ed56>] btrfs_dirty_inode+0x66/0x120 [<ffffffff8114e276>] __mark_inode_dirty+0x36/0x170 [<ffffffff811420dd>] touch_atime+0x12d/0x180 [<ffffffff8113c3ee>] vfs_readdir+0xbe/0xd0 [<ffffffff8113c564>] sys_getdents+0x84/0xf0 [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff WARNING: kmemcheck: Caught 8-bit read from uninitialized memory (ffff88013c101bc8) 00000000000000000004b53c0188ffff70486b3d0188ffff1700000000000000 i i i i i i i i u u u u u u u u u u u u u u u u u u u u u u u u ^ Pid: 4160, comm: gvfs-gdu-volume Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire 5810T/Aspire 5810T RIP: 0010:[<ffffffff81262bbd>] [<ffffffff81262bbd>] add_delayed_ref_head+0x5d/0x120 RSP: 0018:ffff88012aaddab8 EFLAGS: 00010206 RAX: 00000000ffffffff RBX: ffff88013c101b00 RCX: 0000000000001000 RDX: 0000000001c00000 RSI: 0000000000000000 RDI: ffff88010ac28000 RBP: ffff88012aaddad8 R08: 0000000000000002 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: ffff88010ac28000 R13: ffff880116cd2000 R14: 0000000000001000 R15: 0000000001c00000 FS: 00007f2d82ae37a0(0000) GS:ffff880002800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88010ac28030 CR3: 0000000130507000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [<ffffffff81262e6f>] btrfs_add_delayed_tree_ref+0xdf/0x230 [<ffffffff81217cbb>] btrfs_free_tree_block+0x9b/0x350 [<ffffffff8120d2b6>] __btrfs_cow_block+0x4b6/0x5b0 [<ffffffff8120daa1>] btrfs_cow_block+0xf1/0x1d0 [<ffffffff81210156>] btrfs_search_slot+0x1b6/0x820 [<ffffffff81221c1a>] btrfs_lookup_inode+0x2a/0xa0 [<ffffffff8122cf29>] btrfs_update_inode+0x59/0x100 [<ffffffff8122ed56>] btrfs_dirty_inode+0x66/0x120 [<ffffffff8114e276>] __mark_inode_dirty+0x36/0x170 [<ffffffff811420dd>] touch_atime+0x12d/0x180 [<ffffffff8113c3ee>] vfs_readdir+0xbe/0xd0 [<ffffffff8113c564>] sys_getdents+0x84/0xf0 [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff WARNING: kmemcheck: Caught 8-bit read from uninitialized memory (ffff88012762bc92) e85f4b82ffffffff010000000000000002007b81ffffffff98bc62270188ffff u u u u u u u u i i i i u u u u i u u u u u u u u u u u u u u u ^ Pid: 4160, comm: gvfs-gdu-volume Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire 5810T/Aspire 5810T RIP: 0010:[<ffffffff8126297d>] [<ffffffff8126297d>] add_delayed_tree_ref+0x3d/0xe0 RSP: 0018:ffff88012aaddab8 EFLAGS: 00010297 RAX: 0000000000000002 RBX: ffff88012762bc60 RCX: 0000000000001000 RDX: 0000000001c00000 RSI: 0000000000000002 RDI: ffff88010ac28000 RBP: ffff88012aaddad8 R08: 0000000000000000 R09: 0000000000000005 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88010ac28000 R13: ffff88012762bc60 R14: ffff880116cd2000 R15: 0000000001c00000 FS: 00007f2d82ae37a0(0000) GS:ffff880002800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88013e110200 CR3: 0000000130507000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [<ffffffff81262e9d>] btrfs_add_delayed_tree_ref+0x10d/0x230 [<ffffffff81217cbb>] btrfs_free_tree_block+0x9b/0x350 [<ffffffff8120d2b6>] __btrfs_cow_block+0x4b6/0x5b0 [<ffffffff8120daa1>] btrfs_cow_block+0xf1/0x1d0 [<ffffffff81210156>] btrfs_search_slot+0x1b6/0x820 [<ffffffff81221c1a>] btrfs_lookup_inode+0x2a/0xa0 [<ffffffff8122cf29>] btrfs_update_inode+0x59/0x100 [<ffffffff8122ed56>] btrfs_dirty_inode+0x66/0x120 [<ffffffff8114e276>] __mark_inode_dirty+0x36/0x170 [<ffffffff811420dd>] touch_atime+0x12d/0x180 [<ffffffff8113c3ee>] vfs_readdir+0xbe/0xd0 [<ffffffff8113c564>] sys_getdents+0x84/0xf0 [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff WARNING: kmemcheck: Caught 8-bit read from uninitialized memory (ffff880116d8d7a0) a0e2cb3f0188ffffa0e5ce3f0188ffff00030000000000000000000000000000 u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u ^ Pid: 5907, comm: btrfs-transacti Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire 5810T/Aspire 5810T RIP: 0010:[<ffffffff81217922>] [<ffffffff81217922>] btrfs_alloc_free_block+0x232/0x330 RSP: 0018:ffff8801169eb7e0 EFLAGS: 00010202 RAX: 0000000000000011 RBX: ffff880116d8d780 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff8801169eb8e1 RDI: ffff880116d8d791 RBP: ffff8801169eb870 R08: 0000000000000000 R09: ffff880116c60780 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88010e72d7e0 R13: 0000000000000000 R14: ffff88010ac28000 R15: 0000000000000040 FS: 0000000000000000(0000) GS:ffff880002800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88012f3d9531 CR3: 000000013c938000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [<ffffffff8120cf36>] __btrfs_cow_block+0x136/0x5b0 [<ffffffff8120daa1>] btrfs_cow_block+0xf1/0x1d0 [<ffffffff81210156>] btrfs_search_slot+0x1b6/0x820 [<ffffffff8121b4f7>] lookup_inline_extent_backref+0xb7/0x3f0 [<ffffffff8121c911>] __btrfs_free_extent+0xd1/0x720 [<ffffffff8121d726>] run_clustered_refs+0x506/0x830 [<ffffffff8121db10>] btrfs_run_delayed_refs+0xc0/0x240 [<ffffffff81228ab9>] btrfs_commit_transaction+0x79/0x6f0 [<ffffffff81223b63>] transaction_kthread+0x2f3/0x300 [<ffffffff8106be5e>] kthread+0x8e/0xa0 [<ffffffff81003bd4>] kernel_thread_helper+0x4/0x10 [<ffffffffffffffff>] 0xffffffffffffffff WARNING: kmemcheck: Caught 8-bit read from uninitialized memory (ffff88012f3d95c8) 80d7d8160188ffffffffffff92000000c00000000000000000887e270188ffff i i i i i i i i u u u u u u u u u u u u u u u u u u u u u u u u ^ Pid: 5907, comm: btrfs-transacti Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire 5810T/Aspire 5810T RIP: 0010:[<ffffffff81262bbd>] [<ffffffff81262bbd>] add_delayed_ref_head+0x5d/0x120 RSP: 0018:ffff8801169eb730 EFLAGS: 00010206 RAX: 0000000000000001 RBX: ffff88012f3d9500 RCX: 0000000000001000 RDX: 0000000001c07000 RSI: 0000000000000001 RDI: ffff88010ac28000 RBP: ffff8801169eb750 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: ffff88010ac28000 R13: ffff880116cd2000 R14: 0000000000001000 R15: 0000000001c07000 FS: 0000000000000000(0000) GS:ffff880002800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88012f3d9531 CR3: 000000013c938000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [<ffffffff81262e6f>] btrfs_add_delayed_tree_ref+0xdf/0x230 [<ffffffff81217957>] btrfs_alloc_free_block+0x267/0x330 [<ffffffff8120cf36>] __btrfs_cow_block+0x136/0x5b0 [<ffffffff8120daa1>] btrfs_cow_block+0xf1/0x1d0 [<ffffffff81210156>] btrfs_search_slot+0x1b6/0x820 [<ffffffff8121b4f7>] lookup_inline_extent_backref+0xb7/0x3f0 [<ffffffff8121c911>] __btrfs_free_extent+0xd1/0x720 [<ffffffff8121d726>] run_clustered_refs+0x506/0x830 [<ffffffff8121db10>] btrfs_run_delayed_refs+0xc0/0x240 [<ffffffff81228ab9>] btrfs_commit_transaction+0x79/0x6f0 [<ffffffff81223b63>] transaction_kthread+0x2f3/0x300 [<ffffffff8106be5e>] kthread+0x8e/0xa0 [<ffffffff81003bd4>] kernel_thread_helper+0x4/0x10 [<ffffffffffffffff>] 0xffffffffffffffff WARNING: kmemcheck: Caught 8-bit read from uninitialized memory (ffff88011fc33e72) 0000000000000000010000000000000001000000000000000000000000000000 u u u u u u u u i i i i u u u u i u u u u u u u u u u u u u u u ^ Pid: 5907, comm: btrfs-transacti Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire 5810T/Aspire 5810T RIP: 0010:[<ffffffff8126297d>] [<ffffffff8126297d>] add_delayed_tree_ref+0x3d/0xe0 RSP: 0018:ffff8801169eb730 EFLAGS: 00010246 RAX: 0000000000000001 RBX: ffff88011fc33e40 RCX: 0000000000001000 RDX: 0000000001c07000 RSI: 0000000000000003 RDI: ffff88010ac28000 RBP: ffff8801169eb750 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88010ac28000 R13: ffff88011fc33e40 R14: ffff880116cd2000 R15: 0000000001c07000 FS: 0000000000000000(0000) GS:ffff880002800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88011fc33988 CR3: 000000013c938000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [<ffffffff81262e9d>] btrfs_add_delayed_tree_ref+0x10d/0x230 [<ffffffff81217957>] btrfs_alloc_free_block+0x267/0x330 [<ffffffff8120cf36>] __btrfs_cow_block+0x136/0x5b0 [<ffffffff8120daa1>] btrfs_cow_block+0xf1/0x1d0 [<ffffffff81210156>] btrfs_search_slot+0x1b6/0x820 [<ffffffff8121b4f7>] lookup_inline_extent_backref+0xb7/0x3f0 [<ffffffff8121c911>] __btrfs_free_extent+0xd1/0x720 [<ffffffff8121d726>] run_clustered_refs+0x506/0x830 [<ffffffff8121db10>] btrfs_run_delayed_refs+0xc0/0x240 [<ffffffff81228ab9>] btrfs_commit_transaction+0x79/0x6f0 [<ffffffff81223b63>] transaction_kthread+0x2f3/0x300 [<ffffffff8106be5e>] kthread+0x8e/0xa0 [<ffffffff81003bd4>] kernel_thread_helper+0x4/0x10 [<ffffffffffffffff>] 0xffffffffffffffff WARNING: kmemcheck: Caught 8-bit read from uninitialized memory (ffff88012f3d9fc8) 0000000000000000520000007c000000c00000000000000000987e270188ffff i i i i i i i i u u u u u u u u u u u u u u u u u u u u u u u u ^ Pid: 5907, comm: btrfs-transacti Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire 5810T/Aspire 5810T RIP: 0010:[<ffffffff81262bbd>] [<ffffffff81262bbd>] add_delayed_ref_head+0x5d/0x120 RSP: 0018:ffff8801169eb780 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88012f3d9f00 RCX: 0000000000001000 RDX: 0000000001c02000 RSI: 0000000000000000 RDI: ffff88010ac28000 RBP: ffff8801169eb7a0 R08: 0000000000000002 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: ffff88010ac28000 R13: ffff880116cd2000 R14: 0000000000001000 R15: 0000000001c02000 FS: 0000000000000000(0000) GS:ffff880002800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88011fc33988 CR3: 000000013c938000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [<ffffffff81262e6f>] btrfs_add_delayed_tree_ref+0xdf/0x230 [<ffffffff81217cbb>] btrfs_free_tree_block+0x9b/0x350 [<ffffffff8120d2b6>] __btrfs_cow_block+0x4b6/0x5b0 [<ffffffff8120daa1>] btrfs_cow_block+0xf1/0x1d0 [<ffffffff81210156>] btrfs_search_slot+0x1b6/0x820 [<ffffffff8121b4f7>] lookup_inline_extent_backref+0xb7/0x3f0 [<ffffffff8121c911>] __btrfs_free_extent+0xd1/0x720 [<ffffffff8121d726>] run_clustered_refs+0x506/0x830 [<ffffffff8121db10>] btrfs_run_delayed_refs+0xc0/0x240 [<ffffffff81228ab9>] btrfs_commit_transaction+0x79/0x6f0 [<ffffffff81223b63>] transaction_kthread+0x2f3/0x300 [<ffffffff8106be5e>] kthread+0x8e/0xa0 [<ffffffff81003bd4>] kernel_thread_helper+0x4/0x10 [<ffffffffffffffff>] 0xffffffffffffffff WARNING: kmemcheck: Caught 8-bit read from uninitialized memory (ffff88011fc33992) 0000000000000000010000000000000002000000000000000000000000000000 u u u u u u u u i i i i u u u u i u u u u u u u u u u u u u u u ^ Pid: 5907, comm: btrfs-transacti Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire 5810T/Aspire 5810T RIP: 0010:[<ffffffff8126297d>] [<ffffffff8126297d>] add_delayed_tree_ref+0x3d/0xe0 RSP: 0018:ffff8801169eb780 EFLAGS: 00010297 RAX: 0000000000000002 RBX: ffff88011fc33960 RCX: 0000000000001000 RDX: 0000000001c02000 RSI: 0000000000000002 RDI: ffff88010ac28000 RBP: ffff8801169eb7a0 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88010ac28000 R13: ffff88011fc33960 R14: ffff880116cd2000 R15: 0000000001c02000 FS: 0000000000000000(0000) GS:ffff880002800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88013bda0090 CR3: 000000013c938000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [<ffffffff81262e9d>] btrfs_add_delayed_tree_ref+0x10d/0x230 [<ffffffff81217cbb>] btrfs_free_tree_block+0x9b/0x350 [<ffffffff8120d2b6>] __btrfs_cow_block+0x4b6/0x5b0 [<ffffffff8120daa1>] btrfs_cow_block+0xf1/0x1d0 [<ffffffff81210156>] btrfs_search_slot+0x1b6/0x820 [<ffffffff8121b4f7>] lookup_inline_extent_backref+0xb7/0x3f0 [<ffffffff8121c911>] __btrfs_free_extent+0xd1/0x720 [<ffffffff8121d726>] run_clustered_refs+0x506/0x830 [<ffffffff8121db10>] btrfs_run_delayed_refs+0xc0/0x240 [<ffffffff81228ab9>] btrfs_commit_transaction+0x79/0x6f0 [<ffffffff81223b63>] transaction_kthread+0x2f3/0x300 [<ffffffff8106be5e>] kthread+0x8e/0xa0 [<ffffffff81003bd4>] kernel_thread_helper+0x4/0x10 [<ffffffffffffffff>] 0xffffffffffffffff WARNING: kmemcheck: Caught 8-bit read from uninitialized memory (ffff880116d8d7a0) a3e2cb3f0188ffffa0e5ce3f0188ffff00030000000000000000000000000000 u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u ^ Pid: 5907, comm: btrfs-transacti Tainted: G I 2.6.35.6-tuxonice-debug #2 Aspire 5810T/Aspire 5810T RIP: 0010:[<ffffffff81217922>] [<ffffffff81217922>] btrfs_alloc_free_block+0x232/0x330 RSP: 0018:ffff8801169eba10 EFLAGS: 00010202 RAX: 0000000000000011 RBX: ffff880116d8d780 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff8801169ebb11 RDI: ffff880116d8d791 RBP: ffff8801169ebaa0 R08: 0000000000000000 R09: ffff880116c60780 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88010e72d8c0 R13: 0000000000000000 R14: ffff88010ac28000 R15: 0000000000000040 FS: 0000000000000000(0000) GS:ffff880002800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff88011fc33e48 CR3: 000000013cb9a000 CR4: 00000000000406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400 [<ffffffff8120cf36>] __btrfs_cow_block+0x136/0x5b0 [<ffffffff8120daa1>] btrfs_cow_block+0xf1/0x1d0 [<ffffffff81210156>] btrfs_search_slot+0x1b6/0x820 [<ffffffff8121f53f>] btrfs_update_root+0x4f/0xe0 [<ffffffff81228043>] commit_fs_roots+0x113/0x160 [<ffffffff81228d2a>] btrfs_commit_transaction+0x2ea/0x6f0 [<ffffffff81223b63>] transaction_kthread+0x2f3/0x300 [<ffffffff8106be5e>] kthread+0x8e/0xa0 [<ffffffff81003bd4>] kernel_thread_helper+0x4/0x10 [<ffffffffffffffff>] 0xffffffffffffffff
Closing, if this is still affecting you on a newer kernel please reopen.