Re: OOPS in inotify code, kernel 2.6.31.6-162.fc12.i686.PAE

[Eric Paris]

On Sun, 2009-12-20 at 20:17 +0100, Frantisek Hanzlik wrote:
> Frantisek Hanzlik wrote:
> > Hello, when I tried incrond inotify daemon, I found this in system log:
> >
> > Dec 20 05:20:03 franta kernel: ------------[ cut here ]------------
> > Dec 20 05:20:03 franta kernel: WARNING: at
> > fs/notify/inotify/inotify_fsnotify.c:129 idr_callback+0x32/0x56() (Not
> > tainted)
> > Dec 20 05:20:03 franta kernel: Hardware name: P5E-VM HDMI
> > Dec 20 05:20:03 franta kernel: inotify closing but id=0 for
> > entry=ed0b8900 in group=d657d600 still in idr. Probably leaking memory
> > Dec 20 05:20:03 franta kernel: Modules linked in: bluetooth rfkill hfs
> > hfsplus nls_utf8 fuse ipt_MASQUERADE iptable_nat nf_nat nfsd exportfs
> > autofs4 nfs lock
> > d fscache nfs_acl auth_rpcgss sunrpc bridge stp llc cpufreq_ondemand
> > acpi_cpufreq dm_multipath kvm_intel kvm uinput snd_hda_codec_intelhdmi
> > snd_hda_codec_rea
> > ltek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device
> > snd_pcm snd_timer firewire_ohci snd firewire_core crc_itu_t iTCO_wdt
> > soundcore iTCO_vendor_
> > support asus_atk0110 i2c_i801 snd_page_alloc atl1 serio_raw e100 mii
> > ata_generic pata_acpi pata_jmicron i915 drm_kms_helper drm i2c_algo_bit
> > i2c_core video o
> > utput [last unloaded: microcode]
> > Dec 20 05:20:03 franta kernel: Pid: 7426, comm: incrond Not tainted
> > 2.6.31.6-162.fc12.i686.PAE #1
> > Dec 20 05:20:03 franta kernel: Call Trace:
> > Dec 20 05:20:03 franta kernel: [<c043db1b>] warn_slowpath_common+0x70/0x87
> > Dec 20 05:20:03 franta kernel: [<c04edbfc>] ? idr_callback+0x32/0x56
> > Dec 20 05:20:03 franta kernel: [<c043db70>] warn_slowpath_fmt+0x29/0x2c
> > Dec 20 05:20:03 franta kernel: [<c04edbfc>] idr_callback+0x32/0x56
> > Dec 20 05:20:03 franta kernel: [<c059ce18>] idr_for_each+0x5c/0x97
> > Dec 20 05:20:03 franta kernel: [<c04edbca>] ? idr_callback+0x0/0x56
> > Dec 20 05:20:03 franta kernel: [<c04ec2b0>] ? fsnotify_put_event+0x48/0x4b
> > Dec 20 05:20:03 franta kernel: [<c04edbb9>]
> > inotify_free_group_priv+0x1a/0x2b
> > Dec 20 05:20:03 franta kernel: [<c04ec38f>]
> > fsnotify_final_destroy_group+0x1e/0x28
> > Dec 20 05:20:03 franta kernel: [<c04ec453>] fsnotify_put_group+0x75/0x78
> > Dec 20 05:20:03 franta kernel: [<c04edd71>] inotify_release+0x1e/0x28
> > Dec 20 05:20:03 franta kernel: [<c04c9bd7>] __fput+0xed/0x184
> > Dec 20 05:20:03 franta kernel: [<c04c9c86>] fput+0x18/0x1a
> > Dec 20 05:20:03 franta kernel: [<c04c7129>] filp_close+0x56/0x60
> > Dec 20 05:20:03 franta kernel: [<c043f480>] put_files_struct+0x5d/0xa1
> > Dec 20 05:20:03 franta kernel: [<c043f4f7>] exit_files+0x33/0x37
> > Dec 20 05:20:03 franta kernel: [<c0440c60>] do_exit+0x1cb/0x5da
> > Dec 20 05:20:03 franta kernel: [<c04410d5>] do_group_exit+0x66/0x8d
> > Dec 20 05:20:03 franta kernel: [<c0441114>] sys_exit_group+0x18/0x1c
> > Dec 20 05:20:03 franta kernel: [<c0408f9b>] sysenter_do_call+0x12/0x28
> > Dec 20 05:20:03 franta kernel: ---[ end trace bf2ba6f50ae90f71 ]---
> > Dec 20 05:20:03 franta kernel: entry->group=(null) inode=(null) wd=1024
> > Dec 20 05:20:08 franta abrt: Kerneloops: Reported 1 kernel oopses to Abrt
> > Dec 20 05:20:08 franta abrtd: Directory 'kerneloops-1261282808-1'
> > creation detected
> > Dec 20 05:20:08 franta abrtd: Getting local universal unique identification
> > Dec 20 05:20:08 franta abrtd: New crash, saving
> > Dec 20 05:20:08 franta abrtd: Activation of plugin 'RunApp' was not
> > successful: Plugin 'RunApp' is not registered
> >
> >
> > In addition to things above: System is Fedora 12 i686 linux, Core2 Duo
> > E8200, 4GB RAM,
> > ext4 fs on root (where I had inotify paths - they was somewhere under
> > /home/).
> >
> > Or report to Fedora's bugzilla is more appropriate?
> >
> > Thanks, Franta Hanzlik
> 
> Sorry for noise, as I just see this bug is probably already reported by Tim Blechmann's
> mail "WARNING: at fs/notify/inotify/inotify_fsnotify.c:129" from 10 Dec 2009 21:39:00
> and hope solving by Eric Paris.

I did manage to get it set up and reproduced today.  I'll work on
debugging it tomorrow.  Races are always so fun to find....

-Eric

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