toolchain: LLVM 13.0.0
config: defconfig + kcsan.config
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BUG: KCSAN: data-race in ep_modify / ep_poll_callback

write to 0xffff1b7043e931e8 of 4 bytes by task 1 on cpu 2:
 ep_modify+0x68/0x310
 do_epoll_ctl+0x384/0x528
 __arm64_sys_epoll_ctl+0x108/0x168
 invoke_syscall+0x54/0x18c
 el0_svc_common+0x100/0x148
 do_el0_svc+0x38/0xb4
 el0_svc+0x20/0x50
 el0t_64_sync_handler+0x84/0xe4
 el0t_64_sync+0x1a0/0x1a4

read to 0xffff1b7043e931e8 of 4 bytes by task 1858 on cpu 14:
 ep_poll_callback+0x330/0x3ec
 __wake_up_sync_key+0xfc/0x180
 sock_def_readable+0x5c/0xa4
 unix_stream_sendmsg+0x1d8/0x468
 __sys_sendto+0x174/0x1e8
 __arm64_sys_sendto+0x78/0x94
 invoke_syscall+0x54/0x18c
 el0_svc_common+0xc0/0x148
 do_el0_svc+0x38/0xb4
 el0_svc+0x20/0x50
 el0t_64_sync_handler+0x84/0xe4
 el0t_64_sync+0x1a0/0x1a4
  
value changed: 0x00000019 -> 0x00000018
  
Reported by Kernel Concurrency Sanitizer on:
CPU: 14 PID: 1858 Comm: systemd-tmpfile Not tainted 5.16.0-rc4-00002-g58b9ffdc5dc3 #1
EXT4-fs (vda): re-mounted. Opts: (null). Quota mode: none.
Hardware name: linux,dummy-virt (DT)
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