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) {
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