linux-kernel - [lkp] [btrfs] 18513091af: WARNING: CPU: 3 PID: 14091 at fs/btrfs/extent-tree.c:10008 btrfs_free_block

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Date:   Thu, 1 Sep 2016 16:32:01 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Wang Xiaoguang <wangxg.fnst@...fujitsu.com>
Cc:     Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
        David Sterba <dsterba@...e.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...org,
        linux-btrfs@...r.kernel.org
Subject: [lkp] [btrfs]  18513091af: WARNING: CPU: 3 PID: 14091 at
 fs/btrfs/extent-tree.c:10008 btrfs_free_block_groups+0x29b/0x420 [btrfs]


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit 18513091af9483ba84328d42092bd4d42a3c958f ("btrfs: update btrfs_space_info's bytes_may_use timely")

in testcase: xfstests
with following parameters:

	disk: 4HDD
	fs: btrfs
	test: generic-quick1


on test machine: qemu-system-x86_64 -enable-kvm -cpu qemu64,+ssse3 -smp 4 -m 4G

caused below changes:


+---------------------------------------------------------------------------+------------+------------+
|                                                                           | 4824f1f412 | 18513091af |
+---------------------------------------------------------------------------+------------+------------+
| boot_successes                                                            | 8          | 0          |
| boot_failures                                                             | 0          | 4          |
| WARNING:at_fs/btrfs/extent-tree.c:#btrfs_free_block_groups[btrfs]         | 0          | 4          |
+---------------------------------------------------------------------------+------------+------------+



[  279.132633] BTRFS info (device dm-0): has skinny extents
[  279.242965] BTRFS info (device dm-0): checking UUID tree
[  279.522977] ------------[ cut here ]------------
[  279.524657] WARNING: CPU: 3 PID: 14091 at fs/btrfs/extent-tree.c:10008 btrfs_free_block_groups+0x29b/0x420 [btrfs]
[  279.531051] Modules linked in: dm_flakey btrfs xor raid6_pq dm_mod rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sg sr_mod cdrom ata_generic pata_acpi snd_pcm snd_timer ata_piix snd soundcore pcspkr ppdev serio_raw libata floppy i2c_piix4 parport_pc parport acpi_cpufreq
[  279.550377] CPU: 3 PID: 14091 Comm: umount Not tainted 4.7.0-rc6-00087-g1851309 #1
[  279.556229] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[  279.562315]  0000000000000000 ffff880124b7fcf0 ffffffff8143669b 0000000000000000
[  279.568558]  0000000000000000 ffff880124b7fd30 ffffffff8107d3fb 0000271800000000
[  279.574784]  ffff88007e965288 ffff8800aacb4000 ffff88007e965200 ffff88007e964e00
[  279.581047] Call Trace:
[  279.582259]  [<ffffffff8143669b>] dump_stack+0x63/0x88
[  279.587003]  [<ffffffff8107d3fb>] __warn+0xcb/0xf0
[  279.588640]  [<ffffffff8107d4ed>] warn_slowpath_null+0x1d/0x20
[  279.593536]  [<ffffffffa02a708b>] btrfs_free_block_groups+0x29b/0x420 [btrfs]
[  279.598666]  [<ffffffffa02b9092>] close_ctree+0x192/0x370 [btrfs]
[  279.600538]  [<ffffffff8121f1e9>] ? evict_inodes+0x189/0x1a0
[  279.605395]  [<ffffffffa02899c9>] btrfs_put_super+0x19/0x20 [btrfs]
[  279.610339]  [<ffffffff81203acf>] generic_shutdown_super+0x6f/0x100
[  279.612236]  [<ffffffff81203df2>] kill_anon_super+0x12/0x20
[  279.617083]  [<ffffffffa028a7a8>] btrfs_kill_super+0x18/0x110 [btrfs]
[  279.622070]  [<ffffffff81203fa3>] deactivate_locked_super+0x43/0x70
[  279.623980]  [<ffffffff8120448a>] deactivate_super+0x5a/0x60
[  279.628770]  [<ffffffff8122288f>] cleanup_mnt+0x3f/0x90
[  279.630304]  [<ffffffff81222922>] __cleanup_mnt+0x12/0x20
[  279.634894]  [<ffffffff8109b138>] task_work_run+0x88/0xc0
[  279.636419]  [<ffffffff81003312>] exit_to_usermode_loop+0xc2/0xd0
[  279.638171]  [<ffffffff81003c31>] syscall_return_slowpath+0xa1/0xb0
[  279.639841]  [<ffffffff8190d37a>] entry_SYSCALL_64_fastpath+0xa2/0xa4
[  279.658835] ---[ end trace 4976d490d5aef958 ]---
[  279.660401] BTRFS: space_info 1 has 8126464 free, is not full



To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Xiaolong

View attachment "config-4.7.0-rc6-00087-g1851309" of type "text/plain" (151293 bytes)

Download attachment "dmesg.xz" of type "application/octet-stream" (21080 bytes)

View attachment "xfstests" of type "text/plain" (6563 bytes)

View attachment "job.yaml" of type "text/plain" (3487 bytes)

View attachment "reproduce" of type "text/plain" (1521 bytes)