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Subject[BUG] Linux 2.6.22 - Atomic counter underflow in NFS

I am running a 2.6.22 kernel on a dual P4 Xeon (HT enabled) with 2 GB RAM, and I have just found
this BUG in my dmesg log:

nfsd: last server has exited
nfsd: unexporting all filesystems
BUG: atomic counter underflow at:
[<c01a382a>] kref_put+0x66/0x84
[<c0188bc2>] sysfs_hash_and_remove+0xb8/0x12d
[<c0188bca>] sysfs_hash_and_remove+0xc0/0x12d
[<c01522e2>] sysfs_slab_alias+0x19/0x5c
[<c0152438>] sysfs_slab_add+0x113/0x124
[<c01527de>] kmem_cache_create+0x12d/0x1d3
[<f8d9df1b>] nfs4_state_start+0x3b/0x1a7 [nfsd]
[<f8d8a485>] nfsd_svc+0x51/0x10d [nfsd]
[<f8d8ae76>] write_threads+0x65/0x96 [nfsd]
[<c016c279>] simple_transaction_get+0x70/0x82
[<f8d8ae11>] write_threads+0x0/0x96 [nfsd]
[<f8d8ab9f>] nfsctl_transaction_write+0x36/0x5c [nfsd]
[<f8d8ab69>] nfsctl_transaction_write+0x0/0x5c [nfsd]
[<c0155392>] vfs_write+0x8a/0x10c
[<c0155901>] sys_write+0x41/0x67
[<c010266e>] sysenter_past_esp+0x5f/0x85
NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
NFSD: starting 90-second grace period


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