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Message-ID: <20100127190522.GB18278@fieldses.org> Date: Wed, 27 Jan 2010 14:05:22 -0500 From: "J. Bruce Fields" <bfields@...ldses.org> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Harry Edmon <harry@...os.washington.edu>, linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org Subject: Re: 2.6.32.2 - WARNING: at lib/kref.c:43 kref_get+0x,23/0x2b() On Fri, Jan 22, 2010 at 03:03:25PM -0800, Andrew Morton wrote: > (cc linux-nfs) > > On Thu, 14 Jan 2010 09:53:04 -0800 > Harry Edmon <harry@...os.washington.edu> wrote: > > > I have a single quad-core Xeon machine running 2.6.32.2 that keeps > > giving me "WARNING: at lib/kref.c:43 kref_get+0x,23/0x2b()". This > > machine is mainaly used as a NFS server. I have attached the kern.log > > and my config file. Any ideas? Are you using NFSv4, or only v2/v3? Looking at the trace: Jan 11 06:01:51 t kernel: [1311646.832173] ------------[ cut here ]------------ Jan 11 06:01:53 t kernel: [1311646.860891] WARNING: at lib/kref.c:43 kref_get+0x23/0x2b() OK, so that's the warning that we're trying to get something with reference count 0. Jan 11 06:01:53 t kernel: [1311646.894782] Hardware name: X7DB8 Jan 11 06:01:53 t kernel: [1311646.915165] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative nfsd nfs lockd nfs_acl auth_rpcgss sunrpc bridge stp llc ipv6 i5000_edac edac_core i2c_i801 parport_pc parport psmouse container i2c_core ioatdma dca i5k_amb serio_raw pcspkr button processor joydev evdev xfs exportfs sg usbhid sr_mod hid cdrom ata_piix floppy uhci_hcd ehci_hcd ata_generic 3w_9xxx e1000e thermal fan raid1 md_mod sd_mod ahci libata scsi_mod [last unloaded: scsi_wait_scan] Jan 11 06:01:53 t kernel: [1311647.178038] Pid: 3068, comm: nfsd Tainted: G D W 2.6.32.2 #1 What does the very first oops, bug, or warning you get look like? (If I'm reading the tain information right, this isn't the first one.) Jan 11 06:01:53 t kernel: [1311647.216100] Call Trace: Jan 11 06:01:53 t kernel: [1311647.231808] [<ffffffff81142230>] ? kref_get+0x23/0x2b Jan 11 06:01:53 t kernel: [1311647.263633] [<ffffffff81038943>] warn_slowpath_common+0x77/0xa4 Jan 11 06:01:53 t kernel: [1311647.300658] [<ffffffff8103897f>] warn_slowpath_null+0xf/0x11 Jan 11 06:01:53 t kernel: [1311647.336122] [<ffffffff81142230>] kref_get+0x23/0x2b Jan 11 06:01:53 t kernel: [1311647.366914] [<ffffffffa032b7df>] ? nfsd+0x0/0x13a [nfsd] Jan 11 06:01:53 t kernel: [1311647.400301] [<ffffffffa028637f>] svc_recv+0x305/0x7e6 [sunrpc] And the only likely candidate I see for a kref is the svc_xprt_get(xprt). --b. Jan 11 06:01:53 t kernel: [1311647.436803] [<ffffffffa027abe4>] ? svc_process+0x759/0x768 [sunrpc] Jan 11 06:01:53 t kernel: [1311647.475903] [<ffffffff81035177>] ? default_wake_function+0x0/0xf Jan 11 06:01:53 t kernel: [1311647.513452] [<ffffffffa032b7df>] ? nfsd+0x0/0x13a [nfsd] Jan 11 06:01:53 t kernel: [1311647.546838] [<ffffffffa032b886>] nfsd+0xa7/0x13a [nfsd] Jan 11 06:01:53 t kernel: [1311647.579701] [<ffffffff8104af36>] kthread+0x7d/0x85 Jan 11 06:01:53 t kernel: [1311647.609967] [<ffffffff8100c97a>] child_rip+0xa/0x20 Jan 11 06:01:53 t kernel: [1311647.640749] [<ffffffff8104aeb9>] ? kthread+0x0/0x85 Jan 11 06:01:53 t kernel: [1311647.671535] [<ffffffff8100c970>] ? child_rip+0x0/0x20 Jan 11 06:01:53 t kernel: [1311647.703359] ---[ end trace 1a77408724500fc0 ]--- Jan 11 06:01:53 t kernel: [1311647.732134] ------------[ cut here ]------------ Jan 11 06:01:53 t kernel: [1311647.736063] kernel BUG at fs/inode.c:1343! Jan 11 06:01:53 t kernel: [1311647.736063] invalid opcode: 0000 [#10] SMP Jan 11 06:01:53 t kernel: [1311647.736063] last sysfs file: /sys/block/md2/md/raid_disks Jan 11 06:01:53 t kernel: [1311647.736063] CPU 3 Jan 11 06:01:53 t kernel: [1311647.736063] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative nfsd nfs lockd nfs_acl auth_rpcgss sunrpc bridge stp llc ipv6 i5000_edac edac_core i2c_i801 parport_pc parport psmouse container i2c_core ioatdma dca i5k_amb serio_raw pcspkr button processor joydev evdev xfs exportfs sg usbhid sr_mod hid cdrom ata_piix floppy uhci_hcd ehci_hcd ata_generic 3w_9xxx e1000e thermal fan raid1 md_mod sd_mod ahci libata scsi_mod [last unloaded: scsi_wait_scan] Jan 11 06:01:53 t kernel: [1311647.736063] Pid: 3068, comm: nfsd Tainted: G D W 2.6.32.2 #1 X7DB8 Jan 11 06:01:53 t kernel: [1311647.736063] RIP: 0010:[<ffffffff810bccc2>] [<ffffffff810bccc2>] iput+0x1b/0x65 Jan 11 06:01:53 t kernel: [1311647.736063] RSP: 0018:ffff88012730bd20 EFLAGS: 00010246 Jan 11 06:01:53 t kernel: [1311647.736063] RAX: 0000000000000000 RBX: ffff88010c9c7408 RCX: ffffffff8139f927 Jan 11 06:01:53 t kernel: [1311647.736063] RDX: 0000000000000000 RSI: 0000000000000040 RDI: ffff88010c9c7408 Jan 11 06:01:53 t kernel: [1311647.736063] RBP: ffff88012730bd30 R08: 0000000000000020 R09: ffff88002830ca70 Jan 11 06:01:53 t kernel: [1311647.736063] R10: ffffffff81142230 R11: 0000000000000000 R12: ffff88010c9c73c0 Jan 11 06:01:53 t kernel: [1311647.736063] R13: ffffffffa028ef50 R14: ffff880018c58000 R15: ffff88012dd423c0 Jan 11 06:01:53 t kernel: [1311647.736063] FS: 0000000000000000(0000) GS:ffff880028380000(0000) knlGS:0000000000000000 Jan 11 06:01:53 t kernel: [1311647.736063] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b Jan 11 06:01:53 t kernel: [1311647.736063] CR2: 00007f0dc9cc5098 CR3: 0000000005bd8000 CR4: 00000000000006e0 Jan 11 06:01:53 t kernel: [1311647.736063] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Jan 11 06:01:53 t kernel: [1311647.736063] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Jan 11 06:01:53 t kernel: [1311647.736063] Process nfsd (pid: 3068, threadinfo ffff88012730a000, task ffff8801270e8150) Jan 11 06:01:53 t kernel: [1311647.736063] Stack: Jan 11 06:01:53 t kernel: [1311647.736063] ffff88012730bd90 ffff880018c58000 ffff88012730bd50 ffffffff811f4be2 Jan 11 06:01:53 t kernel: [1311647.736063] <0> ffff880018c58000 ffff880018c58010 ffff88012730bd70 ffffffffa027c1d2 Jan 11 06:01:53 t kernel: [1311647.736063] <0> ffff88012730bd70 ffff880018c58000 ffff88012730bda0 ffffffffa0286b03 Jan 11 06:01:53 t kernel: [1311647.736063] Call Trace: Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffff811f4be2>] sock_release+0x5c/0x6c Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffffa027c1d2>] svc_sock_free+0x45/0x51 [sunrpc] Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffffa0286b03>] svc_xprt_free+0x3e/0x4e [sunrpc] Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffff81142230>] ? kref_get+0x23/0x2b Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffffa0286ac5>] ? svc_xprt_free+0x0/0x4e [sunrpc] Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffff81142201>] kref_put+0x43/0x4f Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffffa0285f9f>] svc_xprt_release+0xc6/0xcf [sunrpc] Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffffa02867fc>] svc_recv+0x782/0x7e6 [sunrpc] Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffffa027abe4>] ? svc_process+0x759/0x768 [sunrpc] Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffff81035177>] ? default_wake_function+0x0/0xf Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffffa032b7df>] ? nfsd+0x0/0x13a [nfsd] Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffffa032b886>] nfsd+0xa7/0x13a [nfsd] Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffff8104af36>] kthread+0x7d/0x85 Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffff8100c97a>] child_rip+0xa/0x20 Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffff8104aeb9>] ? kthread+0x0/0x85 Jan 11 06:01:53 t kernel: [1311647.736063] [<ffffffff8100c970>] ? child_rip+0x0/0x20 Jan 11 06:01:53 t kernel: [1311647.736063] Code: c0 74 d5 48 83 c4 20 5b 41 5c 41 5d 41 5e c9 c3 55 48 89 e5 53 48 89 fb 48 83 ec 08 48 85 ff 74 50 48 83 bf 10 02 00 00 40 75 04 <0f> 0b eb fe 48 8d 7f 48 48 c7 c6 a0 7d 4a 81 e8 e2 31 08 00 85 Jan 11 06:01:53 t kernel: [1311647.736063] RIP [<ffffffff810bccc2>] iput+0x1b/0x65 Jan 11 06:01:53 t kernel: [1311647.736063] RSP <ffff88012730bd20> Jan 11 06:01:53 t kernel: [1311649.618340] ---[ end trace 1a77408724500fc1 ]--- -- 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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