WARNING: at fs/fs-writeback.c:292 on mkdir() in sync-mounted ext2 filesystem

WARNING: at fs/fs-writeback.c:292 on mkdir() in sync-mounted ext2 filesystem

[David Madore]

Hi List,

With kernel 2.6.30-rc8 (+ wireless-testing master-2009-06-03, but I
imagine that's not involved here), I get the following warning in
dmesg whenever a process calls mkdir() on an ext2 filesystem mounted
with -o sync:

[144485.269425] ------------[ cut here ]------------
[144485.269436] WARNING: at fs/fs-writeback.c:292 __writeback_single_inode+0x4ab/0x4c0()
[144485.269439] Hardware name: System Product Name
[144485.269441] Modules linked in: mt2060 dvb_usb_dib0700 dib7000p dib7000m dvb_usb dvb_core dib3000mc dibx000_common dib0070 cryptd aes_x86_64 aes_generic arc4 ecb ath5k mac80211 led_class ath cfg80211 rfkill ahci binfmt_misc ppdev parport_pc lp parport nvidia(P) kvm_intel kvm sch_ingress cls_u32 sch_sfq sch_htb ppp_deflate zlib_deflate bsd_comp acpi_cpufreq processor cpufreq_stats cpufreq_powersave cpufreq_ondemand cpufreq_userspace freq_table cpufreq_conservative sit tunnel4 tun af_packet ppp_async crc_ccitt ppp_generic slhc dummy sky2 skge nf_nat_ftp nf_conntrack_ftp ip6table_mangle xt_TCPMSS ipt_MASQUERADE ip6t_REJECT ip6table_filter ip6_tables ipt_REJECT xt_tcpudp xt_DSCP xfs exportfs reiserfs fuse dm_crypt raid456 raid6_pq async_xor async_memcpy async_tx xor raid0 raid1 dm_snapshot 
 dm_mirror dm_region_hash dm_log dm_mod i2c_dev w83627ehf hwmon_vid hwmon i2c_i801 i2c_core pcspkr ide_cd_mod cdrom msr cpuid iTCO_wdt usblp ohci1394 ieee1394 rtc_cmos rtc_core rtc_lib snd_emu10k1_synth snd_emu10k1 snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc snd_emux_synth snd_seq_virmidi snd_seq_midi_emul snd_hwdep snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd soundcore snd_util_mem tcp_diag inet_diag ipv6 evdev usbhid hid uhci_hcd ehci_hcd usbcore iptable_mangle iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 iptable_filter ip_tables x_tables e1000 md_mod
[144485.269614] Pid: 21867, comm: mkdir Tainted: P        W  2.6.30-rc8-vega-wl #1
[144485.269617] Call Trace:
[144485.269622]  [<ffffffff802ec15b>] ? __writeback_single_inode+0x4ab/0x4c0
[144485.269628]  [<ffffffff80242788>] warn_slowpath_common+0x78/0xd0
[144485.269632]  [<ffffffff802427ef>] warn_slowpath_null+0xf/0x20
[144485.269636]  [<ffffffff802ec15b>] __writeback_single_inode+0x4ab/0x4c0
[144485.269641]  [<ffffffff8029db4f>] ? wait_on_page_bit+0x6f/0x80
[144485.269646]  [<ffffffff80259f10>] ? wake_bit_function+0x0/0x40
[144485.269650]  [<ffffffff802ec19e>] sync_inode+0x2e/0x40
[144485.269655]  [<ffffffff80333aae>] ext2_sync_inode+0x2e/0x30
[144485.269659]  [<ffffffff80331a20>] ext2_commit_chunk+0xc0/0xd0
[144485.269663]  [<ffffffff80331bf7>] ext2_make_empty+0x1c7/0x1f0
[144485.269667]  [<ffffffff80336686>] ext2_mkdir+0xd6/0x170
[144485.269671]  [<ffffffff802d703d>] vfs_mkdir+0xed/0x190
[144485.269722]  [<ffffffff802d987e>] sys_mkdirat+0xfe/0x110
[144485.269726]  [<ffffffff8025dc49>] ? up_read+0x9/0x10
[144485.269731]  [<ffffffff80228707>] ? do_page_fault+0x167/0x280
[144485.269735]  [<ffffffff802d98a3>] sys_mkdir+0x13/0x20
[144485.269739]  [<ffffffff8020be6b>] system_call_fastpath+0x16/0x1b
[144485.269742] ---[ end trace 40e36095cd51a60f ]---
[144485.302078] ------------[ cut here ]------------
[144485.302084] WARNING: at fs/fs-writeback.c:317 __writeback_single_inode+0x48d/0x4c0()
[144485.302087] Hardware name: System Product Name
[144485.302089] Modules linked in: mt2060 dvb_usb_dib0700 dib7000p dib7000m dvb_usb dvb_core dib3000mc dibx000_common dib0070 cryptd aes_x86_64 aes_generic arc4 ecb ath5k mac80211 led_class ath cfg80211 rfkill ahci binfmt_misc ppdev parport_pc lp parport nvidia(P) kvm_intel kvm sch_ingress cls_u32 sch_sfq sch_htb ppp_deflate zlib_deflate bsd_comp acpi_cpufreq processor cpufreq_stats cpufreq_powersave cpufreq_ondemand cpufreq_userspace freq_table cpufreq_conservative sit tunnel4 tun af_packet ppp_async crc_ccitt ppp_generic slhc dummy sky2 skge nf_nat_ftp nf_conntrack_ftp ip6table_mangle xt_TCPMSS ipt_MASQUERADE ip6t_REJECT ip6table_filter ip6_tables ipt_REJECT xt_tcpudp xt_DSCP xfs exportfs reiserfs fuse dm_crypt raid456 raid6_pq async_xor async_memcpy async_tx xor raid0 raid1 dm_snapshot 
 dm_mirror dm_region_hash dm_log dm_mod i2c_dev w83627ehf hwmon_vid hwmon i2c_i801 i2c_core pcspkr ide_cd_mod cdrom msr cpuid iTCO_wdt usblp ohci1394 ieee1394 rtc_cmos rtc_core rtc_lib snd_emu10k1_synth snd_emu10k1 snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc snd_emux_synth snd_seq_virmidi snd_seq_midi_emul snd_hwdep snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd soundcore snd_util_mem tcp_diag inet_diag ipv6 evdev usbhid hid uhci_hcd ehci_hcd usbcore iptable_mangle iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 iptable_filter ip_tables x_tables e1000 md_mod
[144485.302196] Pid: 21867, comm: mkdir Tainted: P        W  2.6.30-rc8-vega-wl #1
[144485.302199] Call Trace:
[144485.302203]  [<ffffffff802ec13d>] ? __writeback_single_inode+0x48d/0x4c0
[144485.302208]  [<ffffffff80242788>] warn_slowpath_common+0x78/0xd0
[144485.302212]  [<ffffffff802427ef>] warn_slowpath_null+0xf/0x20
[144485.302216]  [<ffffffff802ec13d>] __writeback_single_inode+0x48d/0x4c0
[144485.302221]  [<ffffffff8029db4f>] ? wait_on_page_bit+0x6f/0x80
[144485.302225]  [<ffffffff80259f10>] ? wake_bit_function+0x0/0x40
[144485.302229]  [<ffffffff802ec19e>] sync_inode+0x2e/0x40
[144485.302260]  [<ffffffff80333aae>] ext2_sync_inode+0x2e/0x30
[144485.302264]  [<ffffffff80331a20>] ext2_commit_chunk+0xc0/0xd0
[144485.302268]  [<ffffffff80331bf7>] ext2_make_empty+0x1c7/0x1f0
[144485.302272]  [<ffffffff80336686>] ext2_mkdir+0xd6/0x170
[144485.302276]  [<ffffffff802d703d>] vfs_mkdir+0xed/0x190
[144485.302280]  [<ffffffff802d987e>] sys_mkdirat+0xfe/0x110
[144485.302284]  [<ffffffff8025dc49>] ? up_read+0x9/0x10
[144485.302288]  [<ffffffff80228707>] ? do_page_fault+0x167/0x280
[144485.302292]  [<ffffffff802d98a3>] sys_mkdir+0x13/0x20
[144485.302296]  [<ffffffff8020be6b>] system_call_fastpath+0x16/0x1b
[144485.302298] ---[ end trace 40e36095cd51a610 ]---

Happy hacking,

-- 
     David A. Madore
   ( http://www.madore.org/~david/ )