Hello, I don't know if it's related but after applying these two patches, I got a crash; will try to get more info. BUG: unable to handle kernel NULL pointer dereference at (nil) IP: [<ffffffff810ee2b3>] filemap_fault+0x23/0x430 PGD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 2 PID: 32013 Comm: umount.nfs4 Tainted: G W 3.14.46 #1 task: ffff880f6044ecc0 ti: ffff880f6044f248 task.ti: ffff880f6044f248 RIP: 0010:[<ffffffff810ee2b3>] [<ffffffff810ee2b3>] filemap_fault+0x23/0x430 RSP: 0000:ffff880f4e56fcc8 EFLAGS: 00010292 RAX: 0000000000000000 RBX: ffff881ff95d4480 RCX: ffff880f4e5749c8 RDX: ffffffff817b60c0 RSI: ffff880f4e56fd50 RDI: ffff881ff95d4480 RBP: ffff880f4e56fd18 R08: 0000000000000007 R09: 00000000000000a8 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000007 R13: ffff880f5b884700 R14: 000002d4a72be5fc R15: 0000000000000000 FS: 000002d4a80c47e0(0000) GS:ffff88103fc40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000000160c000 CR4: 00000000001607f0 Stack: ffff880f6044ecc0 0000000000000009 0000000000000082 0000000000000000 ffff880f6044f448 ffff881ff95d4480 00000000000000a8 0000000000000007 000002d4a72be5fc 0000000000000000 ffff880f4e56fd98 ffffffff81111f88 Call Trace: [<ffffffff81111f88>] __do_fault+0x78/0x5e0 [<ffffffff81116f0c>] handle_mm_fault+0x39c/0xcb0 [<ffffffff81033e23>] __do_page_fault+0x1b3/0x620 [<ffffffff815fc01e>] ? retint_swapgs_pax+0x10/0x15 [<ffffffff810a889d>] ? trace_hardirqs_on_caller+0x13d/0x1e0 [<ffffffff812c827e>] ? trace_hardirqs_off_thunk+0x41/0x43 [<ffffffff812c8238>] ? trace_hardirqs_on_thunk+0x41/0x46 [<ffffffff81178c8b>] ? SyS_umount+0x8b/0x4a0 [<ffffffff815fca33>] ? system_call_fastpath+0x16/0x1b [<ffffffff810342cc>] do_page_fault+0xc/0x20 [<ffffffff815fc272>] page_fault+0x22/0x30 Code: fe ff ff 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 28 4c 8b af a0 00 00 00 4c 8b 66 08 49 8b 85 b8 01 00 00 <4c> 8b 38 48 89 45 c8 49 8b 47 40 48 8d 90 ff 0f 00 00 b8 02 00 RIP [<ffffffff810ee2b3>] filemap_fault+0x23/0x430 RSP <ffff880f4e56fcc8> CR2: 0000000000000000 ---[ end trace 59f46e48035e53e4 ]--- -- William -- 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