2011/8/3 Tsutomu Itoh <t-itoh@xxxxxxxxxxxxxx>:
> 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) {
>
>
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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