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BUG: KCSAN: data-race in p9_client_cb / p9_client_rpc

write to 0xffff88810067e510 of 4 bytes by task 22593 on cpu 0:
 p9_client_cb+0x22/0x50 net/9p/client.c:428
 p9_read_work+0x766/0x860 net/9p/trans_fd.c:364
 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

read to 0xffff88810067e510 of 4 bytes by task 2583 on cpu 1:
 p9_client_rpc+0x27e/0xae0 net/9p/client.c:757
 p9_client_read+0x23e/0x4f0 net/9p/client.c:1583
 v9fs_dir_readdir+0x3bd/0x4a0 fs/9p/vfs_dir.c:112
 iterate_dir+0x312/0x380 fs/readdir.c:65
 ksys_getdents64+0x12a/0x240 fs/readdir.c:372
 __do_sys_getdents64 fs/readdir.c:391 [inline]
 __se_sys_getdents64 fs/readdir.c:388 [inline]
 __x64_sys_getdents64+0x4c/0x60 fs/readdir.c:388
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2583 Comm: syz-executor.3 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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