[ 2847.405452] EXT4-fs warning (device sdc): ext4_da_update_reserve_space:362: ino 75159523, allocated 1 with only 0 reserved metadata blocks (releasing 162 blocks with reserved 162 data blocks) [ 2847.405455] ------------[ cut here ]------------ [ 2847.405460] WARNING: CPU: 2 PID: 108 at fs/ext4/inode.c:363 ext4_da_update_reserve_space+0x2c4/0x330() [ 2847.405461] Modules linked in: fuse nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE ip6t_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw bnep iTCO_wdt iTCO_vendor_support ppdev x86_pkg_temp_thermal coretemp kvm_intel kvm crc32_pclmul crc32c_intel ghash_clmulni_intel microcode btusb bluetooth rfkill serio_raw snd_hda_codec_realtek snd_hda_codec_hdmi snd_emu10k1 i2c_i801 snd_util_mem snd_rawmidi snd_ac97_codec snd_hda_intel ac97_bus snd_hda_codec snd_hwdep snd_seq snd_seq_device emu10k1_gp gameport [ 2847.405485] snd_pcm r8169 mii lpc_ich mfd_core mei_me snd_page_alloc mei shpchp snd_timer snd soundcore parport_pc parport acpi_cpufreq mperf binfmt_misc nfsd auth_rpcgss nfs_acl lockd sunrpc usb_storage hid_logitech_dj i915 firewire_ohci firewire_core i2c_algo_bit crc_itu_t drm_kms_helper drm sata_sil24 i2c_core video [ 2847.405503] CPU: 2 PID: 108 Comm: kworker/u16:3 Tainted: G W 3.11.6-300.fc20.x86_64+debug #1 [ 2847.405504] Hardware name: Gigabyte Technology Co., Ltd. Z87M-D3H/Z87M-D3H, BIOS F8 08/03/2013 [ 2847.405507] Workqueue: writeback bdi_writeback_workfn (flush-8:32) [ 2847.405509] 0000000000000009 ffff88080d08f7a8 ffffffff81728a1c 0000000000000000 [ 2847.405512] ffff88080d08f7e0 ffffffff8107458d 00000000000000a2 0000000000000001 [ 2847.405514] ffff8801ad613020 ffff8807ee0037b0 ffff88080d08fa78 ffff88080d08f7f0 [ 2847.405516] Call Trace: [ 2847.405520] [<ffffffff81728a1c>] dump_stack+0x54/0x74 [ 2847.405523] [<ffffffff8107458d>] warn_slowpath_common+0x7d/0xa0 [ 2847.405525] [<ffffffff8107466a>] warn_slowpath_null+0x1a/0x20 [ 2847.405527] [<ffffffff81285154>] ext4_da_update_reserve_space+0x2c4/0x330 [ 2847.405530] [<ffffffff812b2377>] ext4_ext_map_blocks+0xe27/0x12a0 [ 2847.405532] [<ffffffff812854ad>] ext4_map_blocks+0x2ed/0x560 [ 2847.405534] [<ffffffff81288867>] ext4_writepages+0x677/0x1100 [ 2847.405537] [<ffffffff810f67fb>] ? __module_address+0xab/0x130 [ 2847.405543] [<ffffffff811854b1>] do_writepages+0x21/0x50 [ 2847.405545] [<ffffffff81220420>] __writeback_single_inode+0x40/0x5a0 [ 2847.405546] [<ffffffff81220be5>] writeback_sb_inodes+0x265/0x520 [ 2847.405548] [<ffffffff81220f3f>] __writeback_inodes_wb+0x9f/0xd0 [ 2847.405549] [<ffffffff81221293>] wb_writeback+0x323/0x550 [ 2847.405551] [<ffffffff81221dae>] bdi_writeback_workfn+0x32e/0x680 [ 2847.405554] [<ffffffff81096cf1>] process_one_work+0x211/0x6e0 [ 2847.405556] [<ffffffff81096c85>] ? process_one_work+0x1a5/0x6e0 [ 2847.405558] [<ffffffff810972dd>] worker_thread+0x11d/0x3a0 [ 2847.405560] [<ffffffff810971c0>] ? process_one_work+0x6e0/0x6e0 [ 2847.405565] [<ffffffff8109fe6d>] kthread+0xed/0x100 [ 2847.405568] [<ffffffff8109fd80>] ? insert_kthread_work+0x80/0x80 [ 2847.405577] [<ffffffff8173bcac>] ret_from_fork+0x7c/0xb0 [ 2847.405580] [<ffffffff8109fd80>] ? insert_kthread_work+0x80/0x80 [ 2847.405581] ---[ end trace 07f881d6e2978ecc ]---
Thanks for report. This bug should be fixed by commit 7d7345322d60edb0fa49a64a89b31360f01d09cb (merged in 3.12-rc something). The warning is mostly harmless though (the bug could lead to real problems only if we hit ENOSPC condition). I've asked stable kernel guys to take the commit into 3.10 and 3.11 -stable series.