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BUG: KCSAN: data-race in xprt_clear_locked / xprt_prepare_transmit

read to 0xffff8881216fd4c0 of 8 bytes by task 24691 on cpu 0:
 xprt_lock_write net/sunrpc/xprt.c:303 [inline]
 xprt_prepare_transmit+0x6c/0x120 net/sunrpc/xprt.c:1403
 call_connect+0xfc/0x1a0 net/sunrpc/clnt.c:2091
 __rpc_execute+0xf5/0x640 net/sunrpc/sched.c:903
 rpc_async_schedule+0x66/0xa0 net/sunrpc/sched.c:988
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269
 worker_thread+0xa0/0x800 kernel/workqueue.c:2415
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

write to 0xffff8881216fd4c0 of 8 bytes by task 22492 on cpu 1:
 xprt_clear_locked+0x24/0xb0 net/sunrpc/xprt.c:184
 xprt_release_xprt net/sunrpc/xprt.c:357 [inline]
 xprt_release_xprt+0x4e/0x70 net/sunrpc/xprt.c:354
 xprt_release_write net/sunrpc/xprt.c:385 [inline]
 xprt_release_write net/sunrpc/xprt.c:380 [inline]
 xprt_autoclose+0x139/0x150 net/sunrpc/xprt.c:664
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269
 worker_thread+0xa0/0x800 kernel/workqueue.c:2415
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22492 Comm: kworker/u5:3 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: xprtiod xprt_autoclose
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