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Message-ID: <20120510160437.GA11707@redhat.com> Date: Thu, 10 May 2012 12:04:37 -0400 From: Dave Jones <davej@...hat.com> To: Linux Kernel <linux-kernel@...r.kernel.org> Cc: linus-nfs@...r.kernel.org, bfields@...ldses.org, Fedora Kernel Team <kernel-team@...oraproject.org> Subject: nfs triggering Root dentry has weird name <> We've been getting reports of this message for a while in Fedora (Since circa 3.1). There are two different flavours. One from readlink.. :WARNING: at fs/dcache.c:2460 prepend_path+0x11b/0x131() :Hardware name: System Product Name :Root dentry has weird name <> :Modules linked in: ppdev parport_pc lp parport fuse nfs fscache auth_rpcgss nfs_acl via drm lockd ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack_netbios_ns nf_conntrack_broadcast ip6table_filter nf_conntrack_tftp ip6_tables nf_conntrack snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device joydev snd_pcm via_rhine snd_timer snd mii soundcore snd_page_alloc shpchp asus_atk0110 i2c_viapro i2c_core microcode sunrpc xfs pata_acpi ata_generic pata_via sata_via [last unloaded: scsi_wait_scan] :Pid: 6635, comm: abrt-hook-ccpp Not tainted 3.1.0-7.fc16.x86_64 #1 :Call Trace: : [<ffffffff81057a4e>] warn_slowpath_common+0x83/0x9b : [<ffffffff81057b09>] warn_slowpath_fmt+0x46/0x48 : [<ffffffff81139190>] prepend_path+0x11b/0x131 : [<ffffffff81139216>] path_with_deleted+0x70/0x79 : [<ffffffff8113a40d>] d_path+0xa1/0xc6 : [<ffffffff81175f03>] proc_pid_readlink+0x71/0xcf : [<ffffffff8112cd36>] sys_readlinkat+0x73/0x95 : [<ffffffff8112cd73>] sys_readlink+0x1b/0x1d : [<ffffffff814bc482>] system_call_fastpath+0x16/0x1b and one from getcwd... WARNING: at fs/dcache.c:2458 prepend_path+0x18c/0x1a0() Hardware name: P5KC Root dentry has weird name <> Modules linked in: vfat fat snd_usb_audio snd_usbmidi_lib snd_rawmidi nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack tcp_lp binfmt_misc ppdev parport_pc lp parport fcoe libfcoe libfc scsi_transport_fc scsi_tgt 8021q garp stp llc nfs lockd auth_rpcgss nfs_acl des_generic md4 nls_utf8 cifs fscache ip6t_REJECT fuse snd_hda_codec_hdmi microcode iTCO_wdt iTCO_vendor_support serio_raw snd_hda_codec_realtek i2c_i801 snd_hda_intel snd_hda_codec snd_hwdep asus_atk0110 snd_seq snd_seq_device snd_pcm atl1 mii snd_timer snd soundcore snd_page_alloc uinput sunrpc firewire_ohci firewire_core pata_acpi ata_generic usb_storage crc_itu_t pata_jmicron radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: nf_conntrack] Pid: 18100, comm: view Tainted: G W 3.1.9-1.fc16.x86_64 #1 Call Trace: [<ffffffff8106b7ef>] warn_slowpath_common+0x7f/0xc0 [<ffffffff8106b8e6>] warn_slowpath_fmt+0x46/0x50 [<ffffffff811875bc>] prepend_path+0x18c/0x1a0 [<ffffffff8118a7d7>] sys_getcwd+0xf7/0x1e0 [<ffffffff815dd1c2>] system_call_fastpath+0x16/0x1b The common thing seems to be NFS. I added a patch to print out vfsmnt->mnt_sb->s_type->name, and sure enough every report since has shown nfs in there. Despite how commonly we've had it reported, it seems to be very hard to reproduce. I managed to hit it once myself, but haven't seen it in a month or so since. Original reports at: https://bugzilla.redhat.com/show_bug.cgi?id=766277 https://bugzilla.redhat.com/show_bug.cgi?id=787171 Dave -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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