Hello Josef,
With Skinny metadta and i running your btrfs-next repo for-suse branch
(which has extent ref patch), i hit following problem:
[ 250.679705] BTRFS info (device sdb): relocating block group 35597058048
flags 36
[ 250.728815] BTRFS info (device sdb): relocating block group 35462840320
flags 36
[ 253.562133] Dropping a ref for a root that doesn't have a ref on the block
[ 253.562475] Dumping block entry [34793177088 8192], num_refs 3, metadata 0
[ 253.562795] Ref root 0, parent 35532013568, owner 23988, offset 0,
num_refs 18446744073709551615
[ 253.563126] Ref root 0, parent 35560964096, owner 23988, offset 0,
num_refs 1
[ 253.563505] Ref root 0, parent 35654615040, owner 23988, offset 0,
num_refs 1
[ 253.563837] Ref root 0, parent 35678650368, owner 23988, offset 0,
num_refs 1
[ 253.564162] Root entry 5, num_refs 1
[ 253.564520] Root entry 18446744073709551608, num_refs 18446744073709551615
[ 253.564860] Ref action 4, root 5, ref_root 5, parent 0, owner 23988,
offset 0, num_refs 1
[ 253.565205] [<ffffffffa049d2f1>] process_leaf.isra.6+0x281/0x3e0 [btrfs]
[ 253.565225] [<ffffffffa049de83>] build_ref_tree_for_root+0x433/0x460
[btrfs]
[ 253.565234] [<ffffffffa049e1af>] btrfs_build_ref_tree+0x18f/0x1c0 [btrfs]
[ 253.565241] [<ffffffffa0419ce8>] open_ctree+0x18b8/0x21a0 [btrfs]
[ 253.565247] [<ffffffffa03ecb0e>] btrfs_mount+0x62e/0x8b0 [btrfs]
[ 253.565251] [<ffffffff812324e9>] mount_fs+0x39/0x1b0
[ 253.565255] [<ffffffff8125285b>] vfs_kern_mount+0x6b/0x150
[ 253.565257] [<ffffffff8125565b>] do_mount+0x27b/0xc30
[ 253.565259] [<ffffffff81256356>] SyS_mount+0x96/0xf0
[ 253.565260] [<ffffffff81795429>] system_call_fastpath+0x16/0x1b
[ 253.565263] [<ffffffffffffffff>] 0xffffffffffffffff
[ 253.565272] Ref action 1, root 18446744073709551608, ref_root 0, parent
35654615040, owner 23988, offset 0, num_refs 1
[ 253.565681] [<ffffffffa049d564>] btrfs_ref_tree_mod+0x114/0x570 [btrfs]
[ 253.565692] [<ffffffffa03f946b>] btrfs_inc_extent_ref+0x6b/0x120 [btrfs]
[ 253.565697] [<ffffffffa03fb77c>] __btrfs_mod_ref+0x16c/0x2b0 [btrfs]
[ 253.565702] [<ffffffffa0401504>] btrfs_inc_ref+0x14/0x20 [btrfs]
[ 253.565707] [<ffffffffa03f05ff>] update_ref_for_cow+0x15f/0x380 [btrfs]
[ 253.565711] [<ffffffffa03f0a3d>] __btrfs_cow_block+0x21d/0x540 [btrfs]
[ 253.565716] [<ffffffffa03f0f0c>] btrfs_cow_block+0x12c/0x290 [btrfs]
[ 253.565721] [<ffffffffa046f59c>] do_relocation+0x49c/0x570 [btrfs]
[ 253.565728] [<ffffffffa04723ce>] relocate_tree_blocks+0x60e/0x660 [btrfs]
[ 253.565735] [<ffffffffa0473ce7>] relocate_block_group+0x407/0x690 [btrfs]
[ 253.565741] [<ffffffffa0474148>] btrfs_relocate_block_group+0x1d8/0x2f0
[btrfs]
[ 253.565746] [<ffffffffa04455a7>] btrfs_relocate_chunk.isra.30+0x77/0x800
[btrfs]
[ 253.565753] [<ffffffffa0448a8b>] __btrfs_balance+0x4eb/0x8d0 [btrfs]
[ 253.565760] [<ffffffffa044928a>] btrfs_balance+0x41a/0x720 [btrfs]
[ 253.565766] [<ffffffffa045112a>] btrfs_ioctl_balance+0x16a/0x530 [btrfs]
[ 253.565772] [<ffffffffa0456df8>] btrfs_ioctl+0x588/0x2cb0 [btrfs]
[ 253.565779] Ref action 1, root 18446744073709551608, ref_root 0, parent
35560964096, owner 23988, offset 0, num_refs 1
[ 253.566143] [<ffffffffa049d564>] btrfs_ref_tree_mod+0x114/0x570 [btrfs]
[ 253.566152] [<ffffffffa03f946b>] btrfs_inc_extent_ref+0x6b/0x120 [btrfs]
[ 253.566180] [<ffffffffa03fb77c>] __btrfs_mod_ref+0x16c/0x2b0 [btrfs]
[ 253.566186] [<ffffffffa0401504>] btrfs_inc_ref+0x14/0x20 [btrfs]
[ 253.566191] [<ffffffffa03f071b>] update_ref_for_cow+0x27b/0x380 [btrfs]
[ 253.566195] [<ffffffffa03f0a3d>] __btrfs_cow_block+0x21d/0x540 [btrfs]
[ 253.566199] [<ffffffffa03f0f0c>] btrfs_cow_block+0x12c/0x290 [btrfs]
[ 253.566203] [<ffffffffa046f59c>] do_relocation+0x49c/0x570 [btrfs]
[ 253.566210] [<ffffffffa04723ce>] relocate_tree_blocks+0x60e/0x660 [btrfs]
[ 253.566216] [<ffffffffa0473ce7>] relocate_block_group+0x407/0x690 [btrfs]
[ 253.566222] [<ffffffffa0474148>] btrfs_relocate_block_group+0x1d8/0x2f0
[btrfs]
[ 253.566227] [<ffffffffa04455a7>] btrfs_relocate_chunk.isra.30+0x77/0x800
[btrfs]
[ 253.566233] [<ffffffffa0448a8b>] __btrfs_balance+0x4eb/0x8d0 [btrfs]
[ 253.566240] [<ffffffffa044928a>] btrfs_balance+0x41a/0x720 [btrfs]
[ 253.566245] [<ffffffffa045112a>] btrfs_ioctl_balance+0x16a/0x530 [btrfs]
[ 253.566252] [<ffffffffa0456df8>] btrfs_ioctl+0x588/0x2cb0 [btrfs]
[ 253.566258] Ref action 2, root 18446744073709551608, ref_root 5, parent 0,
owner 23988, offset 0, num_refs 18446744073709551615
[ 253.566641] [<ffffffffa049d710>] btrfs_ref_tree_mod+0x2c0/0x570 [btrfs]
[ 253.566651] [<ffffffffa040404a>] btrfs_free_extent+0x7a/0x180 [btrfs]
[ 253.566657] [<ffffffffa03fb77c>] __btrfs_mod_ref+0x16c/0x2b0 [btrfs]
[ 253.566662] [<ffffffffa0401521>] btrfs_dec_ref+0x11/0x20 [btrfs]
[ 253.566668] [<ffffffffa03f07a8>] update_ref_for_cow+0x308/0x380 [btrfs]
Below is my Test scrips:
#!/bin/bash
DEVICE=/dev/sdb
TEST_MNT=/mnt
SLEEP=3
function run_snapshots()
{
i=1
while [ 1 ]
do
btrfs sub snapshot $TEST_MNT $TEST_MNT/snap_$i
a=$(($i%10))
if [ $a -eq 0 ]; then
btrfs sub delete *
fi
((i++))
sleep $SLEEP
done
}
function run_compiling()
{
while [ 1 ]
do
make -j4 -C $TEST_MNT/linux-btrfs
make -C $TEST_MNT/linux-btrfs clean
done
}
function run_balance()
{
while [ 1 ]
do
btrfs balance start $TEST_MNT
sleep $SLEEP
done
}
run_snapshots &
run_compiling &
run_balance &
——cut—
Mount options:
/dev/sdb /mnt btrfs rw,relatime,space_cache 0 0
Here my /dev/sdb is 10G, and before comping kernel,run ‘make allmodconfig’
Above tests maybe detect more problem， after running a while, system seems
blocked, echo w > /proc/sysrq-trigger
[ 1970.909512] SysRq : Show Blocked State
2 [ 1970.910490] task PC stack pid father
3 [ 1970.910564] kworker/u128:9 D ffff880208a89a30 0 3514 2
0x00000080
4 [ 1970.910587] Workqueue: writeback bdi_writeback_workfn (flush-btrfs-1)
5 [ 1970.910590] ffff8800b3dab8e8 0000000000000046 ffff8800b3dabfd8
00000000001d59c0
6 [ 1970.910594] 00000000001d59c0 ffff880208a89a30 ffff8801f71c3460
ffff8802303d6360
7 [ 1970.910597] ffff88023ff509a8 ffff8800b3dab978 0000000000000002
ffffffff8178eda0
8 [ 1970.910600] Call Trace:
9 [ 1970.910606] [<ffffffff8178eda0>] ? bit_wait+0x50/0x50
10 [ 1970.910609] [<ffffffff8178e56d>] io_schedule+0x9d/0x130
11 [ 1970.910612] [<ffffffff8178edcc>] bit_wait_io+0x2c/0x50
12 [ 1970.910614] [<ffffffff8178eb3b>] __wait_on_bit_lock+0x4b/0xb0
13 [ 1970.910619] [<ffffffff811aa2ef>] __lock_page+0xbf/0xe0
14 [ 1970.910623] [<ffffffff810caa90>] ? autoremove_wake_function+0x40/0x40
15 [ 1970.910642] [<ffffffffa043d9d0>]
extent_write_cache_pages.isra.30.constprop.52+0x410/0x440 [btrfs]
16 [ 1970.910645] [<ffffffff810d6a46>] ? __lock_acquire+0x396/0xbe0
17 [ 1970.910648] [<ffffffff81024ec5>] ? native_sched_clock+0x35/0xa0
18 [ 1970.910661] [<ffffffffa043f92c>] extent_writepages+0x5c/0x90 [btrfs]
19 [ 1970.910672] [<ffffffffa04216a0>] ? btrfs_submit_direct+0x6b0/0x6b0
[btrfs]
20 [ 1970.910674] [<ffffffff810b7174>] ? local_clock+0x24/0x30
21 [ 1970.910685] [<ffffffffa041f008>] btrfs_writepages+0x28/0x30 [btrfs]
22 [ 1970.910688] [<ffffffff811b8a21>] do_writepages+0x21/0x50
23 [ 1970.910692] [<ffffffff8125f920>] __writeback_single_inode+0x40/0x540
24 [ 1970.910694] [<ffffffff81260425>] writeback_sb_inodes+0x275/0x520
25 [ 1970.910697] [<ffffffff8126076f>] __writeback_inodes_wb+0x9f/0xd0
26 [ 1970.910700] [<ffffffff81260a53>] wb_writeback+0x2b3/0x550
27 [ 1970.910702] [<ffffffff811b7e90>] ? bdi_dirty_limit+0x40/0xe0
28 [ 1970.910705] [<ffffffff812610d8>] bdi_writeback_workfn+0x1f8/0x650
29 [ 1970.910711] [<ffffffff8109c684>] process_one_work+0x1c4/0x640
30 [ 1970.910713] [<ffffffff8109c624>] ? process_one_work+0x164/0x640
31 [ 1970.910716] [<ffffffff8109cc1b>] worker_thread+0x11b/0x490
32 [ 1970.910718] [<ffffffff8109cb00>] ? process_one_work+0x640/0x640
33 [ 1970.910721] [<ffffffff810a2f1f>] kthread+0xff/0x120
34 [ 1970.910724] [<ffffffff81024ec5>] ? native_sched_clock+0x35/0xa0
35 [ 1970.910727] [<ffffffff810a2e20>] ? kthread_create_on_node+0x250/0x250
36 [ 1970.910730] [<ffffffff8179537c>] ret_from_fork+0x7c/0xb0
37 [ 1970.910732] [<ffffffff810a2e20>] ? kthread_create_on_node+0x250/0x250
38 [ 1970.910737] kworker/u128:20 D ffff8801f71c3460 0 8244 2
0x00000080
39 [ 1970.910752] Workqueue: btrfs-flush_delalloc btrfs_flush_delalloc_helper
[btrfs]
40 [ 1970.910754] ffff88020aa2b640 0000000000000046 ffff88020aa2bfd8
00000000001d59c0
41 [ 1970.910757] 00000000001d59c0 ffff8801f71c3460 ffff880225e93460
7fffffffffffffff
42 [ 1970.910760] ffff880035763520 ffff880035763518 ffff880225e93460
ffff880201c44000
43 [ 1970.910763] Call Trace:
44 [ 1970.910766] [<ffffffff8178e209>] schedule+0x29/0x70
45 [ 1970.910769] [<ffffffff81793621>] schedule_timeout+0x281/0x460
46 [ 1970.910772] [<ffffffff810d47d5>] ? mark_held_locks+0x75/0xa0
47 [ 1970.910775] [<ffffffff817946ac>] ? _raw_spin_unlock_irq+0x2c/0x40
48 [ 1970.910777] [<ffffffff8178f89c>] wait_for_completion+0xfc/0x140
49 [ 1970.910780] [<ffffffff810b31c0>] ? wake_up_state+0x20/0x20
50 [ 1970.910790] [<ffffffffa0400ff7>]
btrfs_async_run_delayed_refs+0x127/0x150 [btrfs]
51 [ 1970.910802] [<ffffffffa041d0c8>] __btrfs_end_transaction+0x208/0x390
[btrfs]
52 [ 1970.910811] [<ffffffffa041d260>] btrfs_end_transaction+0x10/0x20
[btrfs]
53 [ 1970.910821] [<ffffffffa042365b>] cow_file_range_inline+0x49b/0x5e0
[btrfs]
54 [ 1970.910824] [<ffffffff81024ec5>] ? native_sched_clock+0x35/0xa0
55 [ 1970.910833] [<ffffffffa0423aa3>] cow_file_range+0x303/0x450 [btrfs]
56 [ 1970.910836] [<ffffffff817945b7>] ? _raw_spin_unlock+0x27/0x40
57 [ 1970.910845] [<ffffffffa0424a88>] run_delalloc_range+0x338/0x370 [btrfs]
58 [ 1970.910857] [<ffffffffa043c5e9>] ?
find_lock_delalloc_range+0x1e9/0x210 [btrfs]
59 [ 1970.910859] [<ffffffff810d6a46>] ? __lock_acquire+0x396/0xbe0
60 [ 1970.910870] [<ffffffffa043c72c>]
writepage_delalloc.isra.34+0x11c/0x180 [btrfs]
61 [ 1970.910880] [<ffffffffa043d2fa>] __extent_writepage+0xca/0x390 [btrfs]
62 [ 1970.910883] [<ffffffff811b6f49>] ? clear_page_dirty_for_io+0xc9/0x110
[ 1970.910893] [<ffffffffa043d93a>]
extent_write_cache_pages.isra.30.constprop.52+0x37a/0x440 [btrfs]
64 [ 1970.910895] [<ffffffff81024ec5>] ? native_sched_clock+0x35/0xa0
65 [ 1970.910898] [<ffffffff81024f39>] ? sched_clock+0x9/0x10
66 [ 1970.910900] [<ffffffff810b7175>] ? local_clock+0x25/0x30
67 [ 1970.910909] [<ffffffffa043f92c>] extent_writepages+0x5c/0x90 [btrfs]
68 [ 1970.910918] [<ffffffffa04216a0>] ? btrfs_submit_direct+0x6b0/0x6b0
[btrfs]
69 [ 1970.910928] [<ffffffffa041f008>] btrfs_writepages+0x28/0x30 [btrfs]
70 [ 1970.910930] [<ffffffff811b8a21>] do_writepages+0x21/0x50
71 [ 1970.910933] [<ffffffff811ac7dd>] __filemap_fdatawrite_range+0x5d/0x80
72 [ 1970.910936] [<ffffffff811ac8ac>] filemap_flush+0x1c/0x20
73 [ 1970.910945] [<ffffffffa042271a>] btrfs_run_delalloc_work+0x5a/0xa0
[btrfs]
74 [ 1970.910956] [<ffffffffa044ec1f>] normal_work_helper+0x13f/0x5c0 [btrfs]
75 [ 1970.910966] [<ffffffffa044f0f2>] btrfs_flush_delalloc_helper+0x12/0x20
[btrfs]
76 [ 1970.910969] [<ffffffff8109c684>] process_one_work+0x1c4/0x640
77 [ 1970.910971] [<ffffffff8109c624>] ? process_one_work+0x164/0x640
78 [ 1970.910976] [<ffffffff8109cc1b>] worker_thread+0x11b/0x490
79 [ 1970.910978] [<ffffffff8109cb00>] ? process_one_work+0x640/0x640
80 [ 1970.910981] [<ffffffff810a2f1f>] kthread+0xff/0x120
81 [ 1970.910983] [<ffffffff81024ec5>] ? native_sched_clock+0x35/0xa0
82 [ 1970.910986] [<ffffffff810a2e20>] ? kthread_create_on_node+0x250/0x250
83 [ 1970.910988] [<ffffffff8179537c>] ret_from_fork+0x7c/0xb0
84 [ 1970.910991] [<ffffffff810a2e20>] ? kthread_create_on_node+0x250/0x250
85 [ 1970.910997] btrfs D ffff88022beab460 0 62979 2587
0x00000080
86 [ 1970.911000] ffff880054083870 0000000000000046 ffff880054083fd8
00000000001d59c0
87 [ 1970.911004] 00000000001d59c0 ffff88022beab460 ffff88017f740000
7fffffffffffffff
88 [ 1970.911007] ffff8800546a9520 ffff8800546a9518 ffff88017f740000
ffff880201c44000
89 [ 1970.911010] Call Trace:
90 [ 1970.911012] [<ffffffff8178e209>] schedule+0x29/0x70
91 [ 1970.911015] [<ffffffff81793621>] schedule_timeout+0x281/0x460
92 [ 1970.911018] [<ffffffff810d47d5>] ? mark_held_locks+0x75/0xa0
93 [ 1970.911021] [<ffffffff817946ac>] ? _raw_spin_unlock_irq+0x2c/0x40
94 [ 1970.911023] [<ffffffff8178f89c>] wait_for_completion+0xfc/0x140
95 [ 1970.911026] [<ffffffff810b31c0>] ? wake_up_state+0x20/0x20
96 [ 1970.911035] [<ffffffffa0400ff7>]
btrfs_async_run_delayed_refs+0x127/0x150 [btrfs]
97 [ 1970.911047] [<ffffffffa041d0c8>] __btrfs_end_transaction+0x208/0x390
[btrfs]
98 [ 1970.911059] [<ffffffffa041e0c3>]
btrfs_end_transaction_throttle+0x13/0x20 [btrfs]
99 [ 1970.911073] [<ffffffffa0473cfe>] relocate_block_group+0x41e/0x690
[btrfs]
100 [ 1970.911086] [<ffffffffa0474148>]
btrfs_relocate_block_group+0x1d8/0x2f0 [btrfs]
101 [ 1970.911100] [<ffffffffa04455a7>]
btrfs_relocate_chunk.isra.30+0x77/0x800 [btrfs]
102 [ 1970.911102] [<ffffffff81024f39>] ? sched_clock+0x9/0x10
103 [ 1970.911105] [<ffffffff810b7175>] ? local_clock+0x25/0x30
104 [ 1970.911118] [<ffffffffa0435568>] ? btrfs_get_token_64+0x68/0x100
[btrfs]
105 [ 1970.911132] [<ffffffffa0448a8b>] __btrfs_balance+0x4eb/0x8d0 [btrfs]
106 [ 1970.911146] [<ffffffffa044928a>] btrfs_balance+0x41a/0x720 [btrfs]
107 [ 1970.911159] [<ffffffffa045112a>] ? btrfs_ioctl_balance+0x16a/0x530
[btrfs]
108 [ 1970.911172] [<ffffffffa045112a>] btrfs_ioctl_balance+0x16a/0x530
[btrfs]
109 [ 1970.911186] [<ffffffffa0456df8>] btrfs_ioctl+0x588/0x2cb0 [btrfs]
110 [ 1970.911189] [<ffffffff81024ec5>] ? native_sched_clock+0x35/0xa0
111 [ 1970.911191] [<ffffffff81024f39>] ? sched_clock+0x9/0x10
112 [ 1970.911194] [<ffffffff810b7175>] ? local_clock+0x25/0x30
113 [ 1970.911197] [<ffffffff810cfe7f>] ? up_read+0x1f/0x40
114 [ 1970.911200] [<ffffffff81067a84>] ? __do_page_fault+0x254/0x5b0
115 [ 1970.911202] [<ffffffff810d6a46>] ? __lock_acquire+0x396/0xbe0
116 [ 1970.911206] [<ffffffff81243830>] do_vfs_ioctl+0x300/0x520
117 [ 1970.911209] [<ffffffff8124fc6d>] ? __fget_light+0x13d/0x160
118 [ 1970.911212] [<ffffffff81243ad1>] SyS_ioctl+0x81/0xa0
119 [ 1970.911217] [<ffffffff8114a49c>] ? __audit_syscall_entry+0x9c/0xf0
120 [ 1970.911220] [<ffffffff81795429>] system_call_fastpath+0x16/0x1b
[ 1970.911217] [<ffffffff8114a49c>] ? __audit_syscall_entry+0x9c/0xf0
120 [ 1970.911220] [<ffffffff81795429>] system_call_fastpath+0x16/0x1b
121 [ 1970.911228] as D ffff880225e93460 0 6423 6421
0x00000080
122 [ 1970.911231] ffff880049657ad0 0000000000000046 ffff880049657fd8
00000000001d59c0
123 [ 1970.911235] 00000000001d59c0 ffff880225e93460 ffff880225631a30
7fffffffffffffff
124 [ 1970.911238] ffff880035762b20 ffff880035762b18 ffff880225631a30
ffff880201c44000
125 [ 1970.911241] Call Trace:
126 [ 1970.911244] [<ffffffff8178e209>] schedule+0x29/0x70
127 [ 1970.911247] [<ffffffff81793621>] schedule_timeout+0x281/0x460
128 [ 1970.911250] [<ffffffff810d47d5>] ? mark_held_locks+0x75/0xa0
129 [ 1970.911252] [<ffffffff817946ac>] ? _raw_spin_unlock_irq+0x2c/0x40
130 [ 1970.911255] [<ffffffff8178f89c>] wait_for_completion+0xfc/0x140
131 [ 1970.911258] [<ffffffff810b31c0>] ? wake_up_state+0x20/0x20
132 [ 1970.911268] [<ffffffffa0400ff7>]
btrfs_async_run_delayed_refs+0x127/0x150 [btrfs]
133 [ 1970.911280] [<ffffffffa041d0c8>] __btrfs_end_transaction+0x208/0x390
[btrfs]
134 [ 1970.911292] [<ffffffffa041d260>] btrfs_end_transaction+0x10/0x20
[btrfs]
135 [ 1970.911304] [<ffffffffa0423088>] btrfs_dirty_inode+0x78/0xe0 [btrfs]
136 [ 1970.911307] [<ffffffff8124cf55>] ? touch_atime+0xf5/0x160
137 [ 1970.911319] [<ffffffffa0423154>] btrfs_update_time+0x64/0xd0 [btrfs]
138 [ 1970.911321] [<ffffffff8124cdb5>] update_time+0x25/0xd0
139 [ 1970.911323] [<ffffffff8124cf79>] touch_atime+0x119/0x160
140 [ 1970.911327] [<ffffffff811acf34>] generic_file_read_iter+0x5f4/0x660
141 [ 1970.911330] [<ffffffff810d47d5>] ? mark_held_locks+0x75/0xa0
142 [ 1970.911332] [<ffffffff81790ed6>] ? mutex_lock_nested+0x2d6/0x520
143 [ 1970.911335] [<ffffffff81024ec5>] ? native_sched_clock+0x35/0xa0
144 [ 1970.911338] [<ffffffff8122d82b>] new_sync_read+0x8b/0xd0
145 [ 1970.911340] [<ffffffff8122dfdb>] vfs_read+0x9b/0x180
146 [ 1970.911343] [<ffffffff8122ecf8>] SyS_read+0x58/0xd0
147 [ 1970.911345] [<ffffffff81795429>] system_call_fastpath+0x16/0x1b
148 [ 1970.911347] as D ffff88022bf01a30 0 6433 6431
0x00000080
149 [ 1970.911351] ffff88016f3ffad0 0000000000000046 ffff88016f3fffd8
00000000001d59c0
150 [ 1970.911354] 00000000001d59c0 ffff88022bf01a30 ffff8800ba1a3460
7fffffffffffffff
151 [ 1970.911419] ffff88017faa6820 ffff88017faa6818 ffff8800ba1a3460
ffff880201c44000
152 [ 1970.911423] Call Trace:
153 [ 1970.911426] [<ffffffff8178e209>] schedule+0x29/0x70
154 [ 1970.911429] [<ffffffff81793621>] schedule_timeout+0x281/0x460
155 [ 1970.911432] [<ffffffff810d47d5>] ? mark_held_locks+0x75/0xa0
156 [ 1970.911435] [<ffffffff817946ac>] ? _raw_spin_unlock_irq+0x2c/0x40
157 [ 1970.911438] [<ffffffff8178f89c>] wait_for_completion+0xfc/0x140
158 [ 1970.911440] [<ffffffff810b31c0>] ? wake_up_state+0x20/0x20
159 [ 1970.911452] [<ffffffffa0400ff7>]
btrfs_async_run_delayed_refs+0x127/0x150 [btrfs]
160 [ 1970.911464] [<ffffffffa041d0c8>] __btrfs_end_transaction+0x208/0x390
[btrfs]
161 [ 1970.911476] [<ffffffffa041d260>] btrfs_end_transaction+0x10/0x20
[btrfs]
162 [ 1970.911488] [<ffffffffa0423088>] btrfs_dirty_inode+0x78/0xe0 [btrfs]
163 [ 1970.911490] [<ffffffff8124cf55>] ? touch_atime+0xf5/0x160
164 [ 1970.911502] [<ffffffffa0423154>] btrfs_update_time+0x64/0xd0 [btrfs]
165 [ 1970.911505] [<ffffffff8124cdb5>] update_time+0x25/0xd0
166 [ 1970.911507] [<ffffffff8124cf79>] touch_atime+0x119/0x160
167 [ 1970.911510] [<ffffffff811acf34>] generic_file_read_iter+0x5f4/0x660
168 [ 1970.911513] [<ffffffff810d47d5>] ? mark_held_locks+0x75/0xa0
169 [ 1970.911516] [<ffffffff81790ed6>] ? mutex_lock_nested+0x2d6/0x520
170 [ 1970.911518] [<ffffffff81024ec5>] ? native_sched_clock+0x35/0xa0
171 [ 1970.911521] [<ffffffff8122d82b>] new_sync_read+0x8b/0xd0
172 [ 1970.911523] [<ffffffff8122dfdb>] vfs_read+0x9b/0x180
173 [ 1970.911526] [<ffffffff8122ecf8>] SyS_read+0x58/0xd0
174 [ 1970.911528] [<ffffffff81795429>] system_call_fastpath+0x16/0x1b
175 [ 1970.911530] ld D ffff880225e93460 0 6435 6370
0x00000080
176 [ 1970.911534] ffff880049623ad0 0000000000000046 ffff880049623fd8
00000000001d59c0
177 [ 1970.911537] 00000000001d59c0 ffff880225e93460 ffff8800364b4e90
7fffffffffffffff
178 [ 1970.911541] ffff880035762820 ffff880035762818 ffff8800364b4e90
ffff880201c44000
179 [ 1970.911544] Call Trace:
180 [ 1970.911547] [<ffffffff8178e209>] schedule+0x29/0x7
It is easy to reproduce this problem using my scripts…
> On 10/18/2014 07:21 AM, Petr Janecek wrote:
>> Hello,
>>
>>>> so far I haven't succeeded running btrfs balance on a large
>>>> skinny-metadata fs -- segfault, kernel bug, reproducible. No such
>>>> problems on ^skinny-metadata fs (same disks, same data). Tried both
>>>> several times on 3.17. More info in comments 10,14 in
>>>> https://bugzilla.kernel.org/show_bug.cgi?id=64961
>>>
>>> I can't reproduce this, how big is your home directory, and are you
>>> still seeing corruptions after just rsyncing to a clean fs? Thanks,
>>
>> as I wrote in comment 10, it has improved since year ago when I
>> reported it: I see no corruption at all, neither after rsync, nor after
>> balance crash: btrfs check doesn't find anything wrong, files look ok.
>> The only problem is that after adding a disk the balance segfaults on a
>> kernel bug and the fs gets stuck. When I run balance again after
>> reboot, it makes only a very small progress and crashes again the same
>> way.
>>
>> There are some 2.5TB of data in 7.5M files on that fs. And couple
>> dozen ro snapshots -- I'm testing 3.17 + revert of 9c3b306e1c9e right
>> now, but it takes more than day to copy the data and recreate all the
>> snapshots. But a test with ^skinny-metadata showed no problems, so I
>> don't thing I got bitten by that bug.
>>
>> I have btrfs-image of one of previous runs after crashed balance.
>> It's 15GB. I can place it somewhere with fast link, are you interested?
>>
>>
>
> Yup, send me the link and I'll pull it down. Thanks,
>
> Josef
>
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Best Regards,
Wang Shilong
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