I am still seeing this problem on Ubuntu 9.10. The real problem is that
when this happens (as near as I can tell), my system becomes
unresponsive to network traffic. However, when I go to the console (via
KVM) and simply press enter, everything returns to normal.

This happens intermittently, often (it seems) around midnight. I am
running dovecot imap, and that would seem to be involved in the
information below. There was another bug reported with nearly indentical
details as below and involving dovecot.

I am running a server in this case, no gdm but lots of other usual
server things (apache, postfix, mysql, dovecot, etc). I need this system
to be reliable, and despite apparent reports that this problem was fixed
in 2.6.31-6, clearly it has not been.

So I offer this data point in the hopes that it is helpful, and in the
hope that this issue get some increased priority and gets fixed once and
for all! (For what it's worth, I also run Ubuntu 9.10 on a laptop and on
a system at work, and neither suffer from this. But then, neither of
those systems runs dovecot or any other server-like stuff.

If there is more information I can provide, I am happy to do so. Just
contact me. mark at granoff dot net

$ uname -a
Linux opus 2.6.31-16-generic #52-Ubuntu SMP Thu Dec 3 22:00:22 UTC 2009 i686 
GNU/Linux

>From kern.log:

Dec  9 00:16:58 opus kernel: [147655.680560] ------------[ cut here 
]------------
Dec  9 00:16:58 opus kernel: [147655.680583] WARNING: at 
/build/buildd/linux-2.6.31/fs/notify/inotify/inotify_fsnotify.c:129 
idr_callback+0x4f/0x80()
Dec  9 00:16:58 opus kernel: [147655.680588] Hardware name: A7V400-MX
Dec  9 00:16:58 opus kernel: [147655.680592] inotify closing but id=0 for 
entry=ef9c6840 in group=f6346580 still in idr.  Probably leaking memory
Dec  9 00:16:58 opus kernel: [147655.680596] Modules linked in: snd_via82xx 
snd_ac97_codec iptable_filter ip_tables i2c_viapro ac97_bus snd_pcm_oss 
snd_mixer_oss snd_pcm snd_page_alloc snd_mpu401_uart snd_seq_dummy snd_seq_oss 
snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device 
x_tables lp snd via_ircc irda soundcore ns558 gameport via_agp ppdev parport_pc 
parport shpchp agpgart crc_ccitt raid10 raid456 raid6_pq async_xor async_memcpy 
async_tx xor raid1 raid0 multipath linear via_rhine mii
Dec  9 00:16:58 opus kernel: [147655.680647] Pid: 3969, comm: imap Not tainted 
2.6.31-16-generic #52-Ubuntu
Dec  9 00:16:58 opus kernel: [147655.680651] Call Trace:
Dec  9 00:16:58 opus kernel: [147655.680666]  [<c014518d>] 
warn_slowpath_common+0x6d/0xa0
Dec  9 00:16:58 opus kernel: [147655.680672]  [<c021620f>] ? 
idr_callback+0x4f/0x80
Dec  9 00:16:58 opus kernel: [147655.680676]  [<c021620f>] ? 
idr_callback+0x4f/0x80
Dec  9 00:16:58 opus kernel: [147655.680682]  [<c0145206>] 
warn_slowpath_fmt+0x26/0x30
Dec  9 00:16:58 opus kernel: [147655.680686]  [<c021620f>] 
idr_callback+0x4f/0x80
Dec  9 00:16:58 opus kernel: [147655.680694]  [<c0310fc6>] 
idr_for_each+0x76/0xd0
Dec  9 00:16:58 opus kernel: [147655.680699]  [<c02161c0>] ? 
idr_callback+0x0/0x80
Dec  9 00:16:58 opus kernel: [147655.680704]  [<c0214357>] ? 
fsnotify_put_event+0x37/0x50
Dec  9 00:16:58 opus kernel: [147655.680709]  [<c0214401>] ? 
fsnotify_flush_notify+0x91/0xa0
Dec  9 00:16:58 opus kernel: [147655.680717]  [<c0570ef8>] ? _spin_lock+0x8/0x10
Dec  9 00:16:58 opus kernel: [147655.680721]  [<c02161a5>] 
inotify_free_group_priv+0x15/0x30
Dec  9 00:16:58 opus kernel: [147655.680726]  [<c0214479>] 
fsnotify_final_destroy_group+0x19/0x30
Dec  9 00:16:58 opus kernel: [147655.680731]  [<c0214567>] 
fsnotify_put_group+0x77/0x80
Dec  9 00:16:58 opus kernel: [147655.680736]  [<c0216401>] 
inotify_release+0x21/0x40
Dec  9 00:16:58 opus kernel: [147655.680744]  [<c01e915a>] __fput+0xda/0x1f0
Dec  9 00:16:58 opus kernel: [147655.680748]  [<c01e9285>] fput+0x15/0x20
Dec  9 00:16:58 opus kernel: [147655.680753]  [<c01e56a7>] filp_close+0x47/0x70
Dec  9 00:16:58 opus kernel: [147655.680757]  [<c01e5743>] sys_close+0x73/0xb0
Dec  9 00:16:58 opus kernel: [147655.680763]  [<c010336c>] syscall_call+0x7/0xb
Dec  9 00:16:58 opus kernel: [147655.680767] ---[ end trace 8fc4ecd1bdfbb6f4 
]---
Dec  9 00:16:58 opus kernel: [147655.680771] entry->group=(null) inode=(null) 
wd=1024

-- 
WARNING: at /build/buildd/linux-2.6.31/fs/notify/inotify/inotify_fsnotify.c:129 
idr_callback+0x4f/0x80()
https://bugs.launchpad.net/bugs/442966
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