A diskless station which mounts my NFS server as root device (nolock,nfsvers=3,vers=3)causes a kernel bug on my server: Oct 21 12:44:34 falco kernel: [64002.882741] NFSD: the nfsdcld client tracking upcall will be removed in 3.10. Please transition to using nfsdcltrack. Oct 21 12:46:34 falco kernel: [64123.231017] NFSD: Unable to end grace period: -110 ... Oct 21 13:00:12 falco kernel: [64941.364757] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 Oct 21 13:00:12 falco kernel: [64941.364782] IP: [<ffffffff812de742>] skb_copy_and_csum_datagram_iovec+0x22/0x110 Oct 21 13:00:12 falco kernel: [64941.364804] PGD 3d321067 PUD d9915067 PMD 0 Oct 21 13:00:12 falco kernel: [64941.364819] Oops: 0000 [#1] SMP Oct 21 13:00:12 falco kernel: [64941.364831] Modules linked in: nfsd auth_rpcgss oid_registry nfs_acl lockd sunrpc ipv6 sg usb_storage ahci libahci rtc_cmos floppy evdev coretemp it87 hwmon_vid hwmon i2c_i801 acpi_cpufreq processor r8169 mii pcspkr usbhid xhci_hcd uhci_hcd ehci_pci ehci_hcd usbcore usb_common rr2310_00(PO) Oct 21 13:00:12 falco kernel: [64941.364933] CPU: 0 PID: 23000 Comm: nfsd Tainted: P O 3.14.54 #7 Oct 21 13:00:12 falco kernel: [64941.364948] Hardware name: Gigabyte Technology Co., Ltd. EP35C-DS3R/EP35C-DS3R, BIOS F3 07/17/2008 Oct 21 13:00:12 falco kernel: [64941.364966] task: ffff8801fe3fb170 ti: ffff88003cd84000 task.ti: ffff88003cd84000 Oct 21 13:00:12 falco kernel: [64941.364982] RIP: 0010:[<ffffffff812de742>] [<ffffffff812de742>] skb_copy_and_csum_datagram_iovec+0x22/0x110 Oct 21 13:00:12 falco kernel: [64941.365005] RSP: 0018:ffff88003cd85bd0 EFLAGS: 00010202 Oct 21 13:00:12 falco kernel: [64941.365016] RAX: 0000000000000000 RBX: ffff8800e5e31880 RCX: 00000000000004f8 Oct 21 13:00:12 falco kernel: [64941.365031] RDX: 0000000000000000 RSI: 0000000000001088 RDI: ffff8800d98e9e00 Oct 21 13:00:12 falco kernel: [64941.365046] RBP: 0000000000000008 R08: 0000000000000000 R09: 00000000744d8bb2 Oct 21 13:00:12 falco kernel: [64941.365108] R10: 00000000000004c0 R11: 0000000000000005 R12: ffff8800d98e9e00 Oct 21 13:00:12 falco kernel: [64941.365171] R13: 0000000000001080 R14: 0000000000001080 R15: ffff8800d98e9e00 Oct 21 13:00:12 falco kernel: [64941.365233] FS: 0000000000000000(0000) GS:ffff880213c00000(0000) knlGS:0000000000000000 Oct 21 13:00:12 falco kernel: [64941.365344] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b Oct 21 13:00:12 falco kernel: [64941.365403] CR2: 0000000000000008 CR3: 00000000d80dd000 CR4: 00000000000007f0 Oct 21 13:00:12 falco kernel: [64941.365465] Stack: Oct 21 13:00:12 falco kernel: [64941.365517] ffff8800d98e9e00 ffffffff812d7f3d ffff8800e5e31880 ffff88003cd85dc8 Oct 21 13:00:12 falco kernel: [64941.365632] 0000000000000000 0000000000000000 0000000000001080 ffffffff81331f82 Oct 21 13:00:12 falco kernel: [64941.365740] 0000004213c0c130 0000000000000002 ffff8800e5e318f0 ffff880208ee4028 Oct 21 13:00:12 falco kernel: [64941.365740] Call Trace: Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff812d7f3d>] ? skb_checksum+0x1d/0x30 Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff81331f82>] ? udp_recvmsg+0x1e2/0x350 Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff8133c028>] ? inet_recvmsg+0x48/0x80 Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff812cf802>] ? sock_recvmsg+0x72/0x90 Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff81042811>] ? lock_timer_base.isra.31+0x21/0x50 Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff812cf850>] ? kernel_recvmsg+0x30/0x40 Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffffa01c29a4>] ? svc_udp_recvfrom+0x84/0x3e0 [sunrpc] Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff81042cca>] ? del_timer_sync+0x4a/0x60 Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff81371fbf>] ? schedule_timeout+0x12f/0x1d0 Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffffa01ce231>] ? svc_recv+0x961/0x970 [sunrpc] Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff8105d240>] ? wake_up_process+0x30/0x30 Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffffa021f66d>] ? nfsd+0x9d/0x120 [nfsd] Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffffa021f5d0>] ? nfsd_destroy+0x70/0x70 [nfsd] Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff810535f8>] ? kthread+0xb8/0xd0 Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff81053540>] ? kthread_create_on_node+0x170/0x170 Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff8137b258>] ? ret_from_fork+0x58/0x90 Oct 21 13:00:12 falco kernel: [64941.365740] [<ffffffff81053540>] ? kthread_create_on_node+0x170/0x170 Oct 21 13:00:12 falco kernel: [64941.365740] Code: a5 fe ff ff 0f 1f 44 00 00 41 56 31 c0 41 55 41 54 49 89 fc 55 89 f5 53 48 83 ec 10 8b 77 68 41 89 f5 41 29 ed 0f 84 88 00 00 00 <48> 8b 42 08 48 89 d3 48 85 c0 75 0f 66 90 48 83 c3 10 48 8b 43 Oct 21 13:00:12 falco kernel: [64941.365740] RIP [<ffffffff812de742>] skb_copy_and_csum_datagram_iovec+0x22/0x110 Oct 21 13:00:12 falco kernel: [64941.365740] RSP <ffff88003cd85bd0> Oct 21 13:00:12 falco kernel: [64941.365740] CR2: 0000000000000008 Oct 21 13:00:12 falco kernel: [64941.367743] ---[ end trace 874f0a58b4dbd906 ]--- Cheers, Peter -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
