WARNING: at fs/btrfs/extent-tree.c:5703

I ran subvol & balance test script at current for-linus branch, I got following warning messages.

Thanks,
Tsutomu

Aug  3 17:54:01 luna kernel: [21310.079308] ------------[ cut here ]------------
Aug  3 17:54:01 luna kernel: [21310.079326] WARNING: at fs/btrfs/extent-tree.c:5703 btrfs_alloc_free_block+0xc4/0x286 [btrfs]()
Aug  3 17:54:01 luna kernel: [21310.079329] Hardware name: PRIMERGY
Aug  3 17:54:01 luna kernel: [21310.079331] Modules linked in: btrfs zlib_deflate crc32c libcrc32c autofs4 sunrpc 8021q garp stp llc cpufreq_ondemand acpi_cpufreq freq_table mperf ipv6 ext3 jbd dm_mirror dm_region_hash dm_log dm_mod kvm uinput ppdev parport_pc parport sg pcspkr i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support tg3 shpchp pci_hotplug i3000_edac edac_core ext4 mbcache jbd2 crc16 sd_mod crc_t10dif sr_mod cdrom megaraid_sas pata_acpi ata_generic ata_piix libata scsi_mod floppy [last unloaded: microcode]
Aug  3 17:54:01 luna kernel: [21310.079374] Pid: 28048, comm: btrfs-freespace Tainted: G        W   3.0.0test2+ #1
Aug  3 17:54:01 luna kernel: [21310.079377] Call Trace:
Aug  3 17:54:01 luna kernel: [21310.079383]  [<ffffffff81045426>] warn_slowpath_common+0x85/0x9d
Aug  3 17:54:01 luna kernel: [21310.079387]  [<ffffffff81045458>] warn_slowpath_null+0x1a/0x1c
Aug  3 17:54:01 luna kernel: [21310.079401]  [<ffffffffa037d63a>] btrfs_alloc_free_block+0xc4/0x286 [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079414]  [<ffffffffa0370ebc>] split_leaf+0x2d2/0x52a [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079427]  [<ffffffffa036e4be>] ? btrfs_leaf_free_space+0x3a/0x7e [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079439]  [<ffffffffa037224c>] btrfs_search_slot+0x558/0x5fc [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079455]  [<ffffffffa037fa42>] btrfs_csum_file_blocks+0x20b/0x54f [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079473]  [<ffffffffa038a430>] add_pending_csums+0x3b/0x57 [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079491]  [<ffffffffa0391a63>] btrfs_finish_ordered_io+0x239/0x2bb [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079509]  [<ffffffffa0391b44>] btrfs_writepage_end_io_hook+0x5f/0x7a [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079528]  [<ffffffffa03a05e2>] end_bio_extent_writepage+0xae/0x159 [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079545]  [<ffffffffa0383a23>] ? end_workqueue_fn+0x106/0x120 [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079549]  [<ffffffff811370e7>] bio_endio+0x2d/0x2f
Aug  3 17:54:01 luna kernel: [21310.079564]  [<ffffffffa0383a2e>] end_workqueue_fn+0x111/0x120 [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079582]  [<ffffffffa03a8abf>] worker_loop+0x18a/0x4bb [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079600]  [<ffffffffa03a8935>] ? btrfs_queue_worker+0x224/0x224 [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079618]  [<ffffffffa03a8935>] ? btrfs_queue_worker+0x224/0x224 [btrfs]
Aug  3 17:54:01 luna kernel: [21310.079621]  [<ffffffff810608ac>] kthread+0x82/0x8a
Aug  3 17:54:01 luna kernel: [21310.079625]  [<ffffffff813ac2a4>] kernel_thread_helper+0x4/0x10
Aug  3 17:54:01 luna kernel: [21310.079629]  [<ffffffff8106082a>] ? kthread_worker_fn+0x14a/0x14a
Aug  3 17:54:01 luna kernel: [21310.079633]  [<ffffffff813ac2a0>] ? gs_change+0x13/0x13
Aug  3 17:54:01 luna kernel: [21310.079635] ---[ end trace f6966ebbfde87a2f ]---

[fs/btrfs/extent-tree.c]
5699 ret = block_rsv_use_bytes(block_rsv, blocksize);
5700 if (!ret)
5701 return block_rsv;
5702 if (ret) {
5703 WARN_ON(1);
5704 ret = reserve_metadata_bytes(trans, root, block_rsv, blocksize,
5705 0);
5706 if (!ret) {

2011/8/3 Tsutomu Itoh <[email protected]>:

]------------

tent-tree.c:5703 btrfs_alloc_free_block+0xc4/0x286 [btrfs]()

s zlib_deflate crc32c libcrc32c autofs4 sunrpc 8021q garp stp llc cpufr= eq_ondemand acpi_cpufreq freq_table mperf ipv6 ext3 jbd dm_mirror dm_re= gion_hash dm_log dm_mod kvm uinput ppdev parport_pc parport sg pcspkr i= 2c_i801 i2c_core iTCO_wdt iTCO_vendor_support tg3 shpchp pci_hotplug i3= 000_edac edac_core ext4 mbcache jbd2 crc16 sd_mod crc_t10dif sr_mod cdr= om megaraid_sas pata_acpi ata_generic ata_piix libata scsi_mod floppy [= last unloaded: microcode]

-freespace Tainted: G =A0 =A0 =A0 =A0W =A0 3.0.0test2+ #1

warn_slowpath_common+0x85/0x9d

warn_slowpath_null+0x1a/0x1c

btrfs_alloc_free_block+0xc4/0x286 [btrfs]

split_leaf+0x2d2/0x52a [btrfs]

? btrfs_leaf_free_space+0x3a/0x7e [btrfs]

btrfs_search_slot+0x558/0x5fc [btrfs]

btrfs_csum_file_blocks+0x20b/0x54f [btrfs]

add_pending_csums+0x3b/0x57 [btrfs]

btrfs_finish_ordered_io+0x239/0x2bb [btrfs]

btrfs_writepage_end_io_hook+0x5f/0x7a [btrfs]

end_bio_extent_writepage+0xae/0x159 [btrfs]

? end_workqueue_fn+0x106/0x120 [btrfs]

bio_endio+0x2d/0x2f

end_workqueue_fn+0x111/0x120 [btrfs]

worker_loop+0x18a/0x4bb [btrfs]

? btrfs_queue_worker+0x224/0x224 [btrfs]

? btrfs_queue_worker+0x224/0x224 [btrfs]

kthread+0x82/0x8a

kernel_thread_helper+0x4/0x10

? kthread_worker_fn+0x14a/0x14a

? gs_change+0x13/0x13

fde87a2f ]---

);

rans, root, block_rsv, blocksize,

=A0 =A0 =A0 =A0 =A0 =A0 =A00);

I have also run across this WARNING.

The backtrace is slightly different, but the WARNING was at the same point in extent-tree.c

[  306.932565] ------------[ cut here ]------------
[  306.932581] WARNING: at fs/btrfs/extent-tree.c:5703
btrfs_alloc_free_block+0x9d/0x460()
[  306.932584] Hardware name:
[  306.932585] Modules linked in: nvidia(P) snd_intel8x0 forcedeth
i2c_nforce2 snd_ac97_codec ac97_bus
[  306.932596] Pid: 3088, comm: btrfs-freespace Tainted: P        W
3.0.0-git-local-v2+ #1
[  306.932599] Call Trace:
[  306.932607]  [<c1031222>] warn_slowpath_common+0x72/0xa0
[  306.932611]  [<c12e867d>] ? btrfs_alloc_free_block+0x9d/0x460
[  306.932615]  [<c12e867d>] ? btrfs_alloc_free_block+0x9d/0x460
[  306.932619]  [<c1031272>] warn_slowpath_null+0x22/0x30
[  306.932623]  [<c12e867d>] btrfs_alloc_free_block+0x9d/0x460
[  306.932629]  [<c13180d7>] ? map_private_extent_buffer+0x77/0x110
[  306.932633]  [<c130d3fd>] ? btrfs_item_offset+0x3d/0x80
[  306.932640]  [<c12d60b5>] ? leaf_space_used+0x85/0xb0
[  306.932645]  [<c12da942>] split_leaf+0x102/0x680
[  306.932650]  [<c12db801>] btrfs_search_slot+0x731/0x7b0
[  306.932656]  [<c12ee260>] btrfs_csum_file_blocks+0x4a0/0x600
[  306.932660]  [<c131249c>] ? free_extent_state+0x2c/0x40
[  306.932664]  [<c1312a37>] ? clear_extent_bit+0x107/0x4f0
[  306.932669]  [<c12f91cd>] add_pending_csums.clone.30+0x3d/0x60
[  306.932673]  [<c12fcfe8>] btrfs_finish_ordered_io+0x278/0x3b0
[  306.932678]  [<c12fd163>] btrfs_writepage_end_io_hook+0x43/0xa0
[  306.932682]  [<c1312fa1>] end_bio_extent_writepage+0x181/0x1c0
[  306.932688]  [<c103d5bd>] ? lock_timer_base.clone.26+0x1d/0x40
[  306.932692]  [<c12fd120>] ? btrfs_finish_ordered_io+0x3b0/0x3b0
[  306.932699]  [<c1103959>] bio_endio+0x19/0x30
[  306.932703]  [<c12f03f5>] end_workqueue_fn+0x125/0x180
[  306.932707]  [<c103d590>] ? cascade+0x80/0x80
[  306.932712]  [<c131fe01>] worker_loop+0x91/0x350
[  306.932717]  [<c1022238>] ? __wake_up_common+0x48/0x70
[  306.932733]  [<c131fd70>] ? btrfs_queue_worker+0x240/0x240
[  306.932740]  [<c104c094>] kthread+0x74/0x80
[  306.932744]  [<c104c020>] ? kthread_worker_fn+0x110/0x110
[  306.932752]  [<c170b2f6>] kernel_thread_helper+0x6/0x10
[  306.932754] ---[ end trace 2304d1d1bfe7619c ]---

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