I managed to hit a similar but different issue with your patch applied (note
the slab poisoning pattern in rax):
generic/089 409s ...[ 399.057379] general protection fault: 0000 [#1]
SMP
[ 399.059137] Modules linked in:
[ 399.060089] CPU: 2 PID: 4367 Comm: kworker/2:2 Not tainted 3.16.0-rc6+ #1153
[ 399.060617] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
[ 399.060617] Workqueue: nfsiod free_lock_state_work
[ 399.060617] task: ffff88007ab68810 ti: ffff88007c3b4000 task.ti: ffff88007c3b4000
[ 399.060617] RIP: 0010:[<ffffffff8134e5bb>] [<ffffffff8134e5bb>] nfs41_free_lock_state+0x2b/0x70
[ 399.060617] RSP: 0018:ffff88007c3b7d18 EFLAGS: 00010286
[ 399.060617] RAX: 6b6b6b6b6b6b6b6b RBX: ffff88007cdd3800 RCX: 0000000000000000
[ 399.060617] RDX: ffffffff81e04c60 RSI: ffff88007cdd39a0 RDI: ffff880079e5a000
[ 399.060617] RBP: ffff88007c3b7d38 R08: ffffffff832df6d0 R09: 000001c90f100000
[ 399.060617] R10: 0000000000000000 R11: 00000000000656f0 R12: ffff880079e5a000
[ 399.060617] R13: ffff88007fd18b00 R14: ffff88007cdd39c0 R15: 0000000000000000
[ 399.060617] FS: 0000000000000000(0000) GS:ffff88007fd00000(0000) knlGS:0000000000000000
[ 399.060617] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 399.060617] CR2: 00007f5ac2f56800 CR3: 000000007a95b000 CR4: 00000000000006e0
[ 399.060617] Stack:
[ 399.060617] 000000007fd13240 ffff88007a8f7800 ffff88007fd13240 ffff88007fd18b00
[ 399.060617] ffff88007c3b7d58 ffffffff813621ae ffff88007cdd39c0 ffff88007a4d0c40
[ 399.060617] ffff88007c3b7dd8 ffffffff810cc877 ffffffff810cc80d ffff88007fd13258
[ 399.060617] Call Trace:
[ 399.060617] [<ffffffff813621ae>] free_lock_state_work+0x2e/0x40
[ 399.060617] [<ffffffff810cc877>] process_one_work+0x1c7/0x490
[ 399.060617] [<ffffffff810cc80d>] ? process_one_work+0x15d/0x490
[ 399.060617] [<ffffffff810cd569>] worker_thread+0x119/0x4f0
[ 399.060617] [<ffffffff810fbbad>] ? trace_hardirqs_on+0xd/0x10
[ 399.060617] [<ffffffff810cd450>] ? init_pwq+0x190/0x190
[ 399.060617] [<ffffffff810d3c6f>] kthread+0xdf/0x100
[ 399.060617] [<ffffffff810d3b90>] ? __init_kthread_worker+0x70/0x70
[ 399.060617] [<ffffffff81d9873c>] ret_from_fork+0x7c/0xb0
[ 399.060617] [<ffffffff810d3b90>] ? __init_kthread_worker+0x70/0x70
(gdb) l *(nfs41_free_lock_state+0x2b)
0xffffffff8134e5bb is in nfs41_free_lock_state (fs/nfs/nfs4proc.c:8313).
8308 nfs41_free_lock_state(struct nfs_server *server, struct
nfs4_lock_state *lsp)
8309 {
8310 struct rpc_task *task;
8311 struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8312
8313 task = _nfs41_free_stateid(server, &lsp->ls_stateid,
cred, false);
8314 nfs4_free_lock_state(server, lsp);
8315 if (IS_ERR(task))
8316 return;
8317 rpc_put_task(task);
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