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Subject[2.6.37.6] warn_slowpath at fs/dcache.c:1996 prepend_path+0x150/0x160()
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Hi,

on quite heavy loaded (~20) dual opteron i'm observing from time to time a slow path warning:

May 19 19:33:42 odra kernel: [105977.220094] ------------[ cut here ]------------
May 19 19:33:42 odra kernel: [105977.220102] WARNING: at /home/users/builder/rpm/BUILD/kernel-2.6.37.6/linux-2.6.37/fs/dcache.c:1996 prepend_path+0x150/0x160()
May 19 19:33:42 odra kernel: [105977.220105] Hardware name: H8DGU
May 19 19:33:42 odra kernel: [105977.220106] Root dentry has weird name <>
May 19 19:33:42 odra kernel: [105977.220108] Modules linked in: nfs fscache binfmt_misc nfsd lockd nfs_acl auth_rpcgss sunrpc exportfs ipmi_si ipmi_devintf ipmi_msghandler sch_sfq iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 iptable_filter xt_TCPMSS xt_tcpudp iptable_mangle ip_tables ip6table_filter ip6_tables x_tables ext4 jbd2 crc16 raid0 dm_mod uvesafb autofs4 dummy aoe usbhid hid sr_mod cdrom ohci_hcd ide_pci_generic pata_acpi ata_generic atiixp ide_core i2c_piix4 psmouse amd64_edac_mod ssb igb mmc_core ehci_hcd edac_core evdev pcmcia usbcore i2c_core pcspkr k10temp serio_raw pcmcia_core dca edac_mce_amd pata_atiixp hwmon processor sg shpchp pci_hotplug ghes hed button sd_mod crc_t10dif raid1 md_mod ext3 jbd mbcache ahci libahci libata scsi_mod [last unloaded: scsi_wait_scan]
May 19 19:33:42 odra kernel: [105977.220165] Pid: 27482, comm: pidof xid: #0 Not tainted 2.6.37.6-2 #1
May 19 19:33:42 odra kernel: [105977.220167] Call Trace:
May 19 19:33:42 odra kernel: [105977.220175] [<ffffffff81049e8a>] warn_slowpath_common+0x7a/0xb0
May 19 19:33:42 odra kernel: [105977.220179] [<ffffffff81049f61>] warn_slowpath_fmt+0x41/0x50
May 19 19:33:42 odra kernel: [105977.220183] [<ffffffff81163860>] prepend_path+0x150/0x160
May 19 19:33:42 odra kernel: [105977.220186] [<ffffffff811638ea>] path_with_deleted+0x7a/0x90
May 19 19:33:42 odra kernel: [105977.220189] [<ffffffff811639b9>] d_path+0xb9/0xf0
May 19 19:33:42 odra kernel: [105977.220193] [<ffffffff811aefff>] proc_pid_readlink+0x8f/0x1c0
May 19 19:33:42 odra kernel: [105977.220197] [<ffffffff811661bc>] ? touch_atime+0x6c/0x1a0
May 19 19:33:42 odra kernel: [105977.220201] [<ffffffff81151861>] sys_readlinkat+0xb1/0xc0
May 19 19:33:42 odra kernel: [105977.220205] [<ffffffff81151886>] sys_readlink+0x16/0x20
May 19 19:33:42 odra kernel: [105977.220209] [<ffffffff81002e3b>] system_call_fastpath+0x16/0x1b
May 19 19:33:42 odra kernel: [105977.220212] ---[ end trace 6e6e81a31199f8f8 ]---
May 19 19:33:42 odra kernel: [105977.221291] ------------[ cut here ]------------

i'm not sure that is a vanilla kernel problem becuase the vendor applies vserver/grsecurity patches.
maybe this backtrace will be useful for developers.

BR,
Paweł.
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