write/read 30 MB file BUG: unable to handle kernel NULL pointer dereference at 0000000000000040 IP: [] encode_sequence+0x4c/0x122 [nfs] PGD 13478067 PUD 21565067 PMD 0 Oops: 0000 [#1] SMP last sysfs file: /sys/devices/virtual/net/pan0/flags CPU 0 Modules linked in: nfs nfsd lockd nfs_acl auth_rpcgss exportfs bridge stp bnep sco l2cap bluetooth sunrpc ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 dm_multipath uinput virtio_net floppy snd_ens1370 gameport snd_rawmidi pcspkr snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore snd_page_alloc i2c_piix4 i2c_core virtio_blk virtio_pci virtio_ring virtio [last unloaded: freq_table] Pid: 16033, comm: bigfile Not tainted 2.6.29-0.37.rc5.git4.nfs41_022098.fc10.x86_64 #1 RIP: 0010:[] [] encode_sequence+0x4c/0x122 [nfs] RSP: 0018:ffff88003b511938 EFLAGS: 00010213 RAX: ffff88001354a06c RBX: ffff88003b02dc60 RCX: ffff88001354a068 RDX: ffff88003b511998 RSI: 0000000000000004 RDI: ffff88003b5119c8 RBP: ffff88003b511988 R08: ffff88001354a470 R09: ffff88001354a06c R10: ffff88001354a068 R11: ffff88003b511b78 R12: ffff88003b5119c8 R13: ffff88003b02dc08 R14: 0000000000000000 R15: ffff88003b511998 FS: 00007f5ea52c26f0(0000) GS:ffffffff81744000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000040 CR3: 0000000021582000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process bigfile (pid: 16033, threadinfo ffff88003b510000, task ffff880029995bc0) Stack: ffff88003b511ac8 ffffffff812cfd58 ffff880021571a60 0000000000000000 ffff88003b5119c8 ffff88003b511998 ffff88003b5119c8 ffff88003b02dc08 ffff88001354a068 ffff8800134fd608 ffff88003b511a08 ffffffffa02ae7e6 Call Trace: [] ? sock_sendmsg+0xc7/0xe0 [] nfs4_xdr_enc_open+0x75/0xe6 [nfs] [] ? rpcauth_lookup_credcache+0x1b5/0x1c7 [sunrpc] [] rpcauth_wrap_req+0x7a/0x87 [sunrpc] [] ? nfs4_xdr_enc_open+0x0/0xe6 [nfs] [] rpc_xdr_encode+0x166/0x172 [sunrpc] [] call_transmit+0x80/0xf2 [sunrpc] [] __rpc_execute+0x78/0x20d [sunrpc] [] rpc_execute+0x28/0x2c [sunrpc] [] rpc_run_task+0x56/0x5e [sunrpc] [] _nfs4_proc_open+0xe0/0x2dd [nfs] [] nfs4_open_recover_helper+0x4c/0x92 [nfs] [] nfs4_open_recover+0x30/0xf0 [nfs] [] nfs4_open_delegation_recall+0xae/0x119 [nfs] [] ? nfs_write_mapping+0x72/0x7d [nfs] [] nfs_delegation_claim_opens+0xa5/0x16b [nfs] [] __nfs_inode_return_delegation+0x30/0x59 [nfs] [] nfs_inode_return_delegation+0x66/0x72 [nfs] [] nfs_sillyrename+0xaf/0x1e9 [nfs] [] nfs_unlink+0x88/0x113 [nfs] [] vfs_unlink+0x80/0xc7 [] do_unlinkat+0xc8/0x158 [] ? trace_hardirqs_off_thunk+0x3a/0x6c [] ? audit_syscall_entry+0x114/0x140 [] sys_unlink+0x11/0x13 [] system_call_fastpath+0x16/0x1b Code: 36 0f 84 eb 00 00 00 80 7e 08 ff 75 15 31 d2 be 53 06 00 00 48 c7 c7 97 b1 2b a0 31 c0 e8 7c fc d9 e0 48 8b 7d d0 be 04 00 00 00 <4d> 8b 6e 40 44 8a 63 08 e8 f3 26 f0 ff 48 85 c0 48 89 c2 75 04 RIP [] encode_sequence+0x4c/0x122 [nfs] RSP CR2: 0000000000000040 ---[ end trace 23cdd7ae0fb85b2e ]---