Got this with 3.18.1 and qgroups enabled. Not sure how to reproduce.
[1262648.802286] ------------[ cut here ]------------
[1262648.802350] WARNING: CPU: 1 PID: 2436 at fs/btrfs/qgroup.c:1414
btrfs_delayed_qgroup_accounting+0x9f1/0xa0b [btrfs]()
[1262648.802441] Modules linked in: ipt_MASQUERADE
nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4
nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables cpufreq_ondemand
cpufreq_conservative cpufreq_powersave cpufreq_stats nfsd auth_rpcgss
oid_registry exportfs nfs_acl nfs lockd grace fscache sunrpc ipv6 btrfs
xor raid6_pq zlib_deflate coretemp hwmon loop pcspkr i2c_i801 i2c_core
battery parport_pc parport 8250_fintek tpm_infineon tpm_tis tpm video
ehci_pci ehci_hcd lpc_ich mfd_core acpi_cpufreq button ext4 crc16 jbd2
mbcache raid1 sg sd_mod r8169 mii ahci libahci libata scsi_mod
[1262648.802854] CPU: 1 PID: 2436 Comm: btrfs-cleaner Not tainted 3.18.1
#1
[1262648.802902] Hardware name: System manufacturer System Product
Name/P8H77-M PRO, BIOS 1101 02/04/2013
[1262648.802992] 0000000000000009 ffff8800c805fbe8 ffffffff813b1128
0000000000000000
[1262648.803081] 0000000000000000 ffff8800c805fc28 ffffffff81039b39
ffff8807f341c000
[1262648.803170] ffffffffa0300be2 ffff8807f341c000 ffff8807f3fd8b40
ffffffffffffffff
[1262648.803259] Call Trace:
[1262648.803305] [<ffffffff813b1128>] dump_stack+0x46/0x58
[1262648.803352] [<ffffffff81039b39>] warn_slowpath_common+0x77/0x91
[1262648.803406] [<ffffffffa0300be2>] ?
btrfs_delayed_qgroup_accounting+0x9f1/0xa0b [btrfs]
[1262648.803495] [<ffffffff81039b68>] warn_slowpath_null+0x15/0x17
[1262648.803548] [<ffffffffa0300be2>]
btrfs_delayed_qgroup_accounting+0x9f1/0xa0b [btrfs]
[1262648.803642] [<ffffffffa02a12a5>]
btrfs_run_delayed_refs+0x1e4/0x21b [btrfs]
[1262648.803734] [<ffffffffa02aec96>]
btrfs_should_end_transaction+0x4a/0x53 [btrfs]
[1262648.803826] [<ffffffffa029fc34>] btrfs_drop_snapshot+0x379/0x68f
[btrfs]
[1262648.803881] [<ffffffffa02be478>] ?
btrfs_run_defrag_inodes+0x2fa/0x30e [btrfs]
[1262648.803974] [<ffffffffa02b0401>]
btrfs_clean_one_deleted_snapshot+0xb3/0xc2 [btrfs]
[1262648.804067] [<ffffffffa02a84ff>] cleaner_kthread+0x134/0x16c
[btrfs]
[1262648.804119] [<ffffffffa02a83cb>] ? btrfs_alloc_root+0x2c/0x2c
[btrfs]
[1262648.804169] [<ffffffff8104ebe7>] kthread+0xcd/0xd5
[1262648.804215] [<ffffffff8104eb1a>] ?
kthread_freezable_should_stop+0x43/0x43
[1262648.804264] [<ffffffff813b59ec>] ret_from_fork+0x7c/0xb0
[1262648.804311] [<ffffffff8104eb1a>] ?
kthread_freezable_should_stop+0x43/0x43
[1262648.804360] ---[ end trace b76fd72b4be63515 ]---
--
Tomasz Chmielewski
http://www.sslrack.com
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