On Wed, Oct 21, 2015 at 09:19:48PM +0200, Hans-Peter Budek wrote: > J. Bruce Fields wrote: > > On Wed, Oct 21, 2015 at 01:24:30PM +0200, Hans-Peter Budek wrote: > >> A diskless station which mounts my NFS server as root device > >> (nolock,nfsvers=3,vers=3)causes a kernel bug on my server: > > > > I don't have the bandwidth to handle all bugs myself, would you mind > > resending this with a cc: to linux-nfs@xxxxxxxxxxxxxxx? > > > > Doesn't ring any bells off the top of my head. > > > > I'd also be curious to know whether this is reproduceable (e.g., if it > > happens every (or most) times you boot this client, and whether there > > was some previous kernel version where this didn't happen (so, did this > > just start happening on an upgrade of your server's kernel). > > I checked this about 10 times. This happend every time with a similar kernel > log. The contents of some registers and the stack was slightly different but > the call trace and the dereference of 0x8 remained the same. > I had to reboot my server each time because it doesn't respond to nfs mount > requests after the trap. > The previous kernel version was 3.14.35 which seems to work. Between 3.14.35 and 3.14.54 I don't see any interesting changes in fs/nfsd or net/sunrpc. Given where it happened this could be due to a networking change. Unless someone comes up with a better idea, another option may just be to a search by bisection between those two versions. --b. > > Cheers, > Peter > > > > --b. > > > >> > >> 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
