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BUG: KCSAN: data-race in event_sched_out / perf_mmap

read to 0xffff888133a9dcc8 of 8 bytes by task 18367 on cpu 1:
 __perf_update_times kernel/events/core.c:638 [inline]
 perf_event_update_time kernel/events/core.c:647 [inline]
 perf_mmap+0xbe1/0xe80 kernel/events/core.c:6355
 call_mmap include/linux/fs.h:2091 [inline]
 mmap_region+0xb04/0x10b0 mm/mmap.c:1793
 do_mmap+0x781/0xc20 mm/mmap.c:1582
 vm_mmap_pgoff+0x117/0x1f0 mm/util.c:519
 ksys_mmap_pgoff+0x265/0x320 mm/mmap.c:1630
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

write to 0xffff888133a9dcc8 of 8 bytes by task 18362 on cpu 0:
 perf_event_update_time kernel/events/core.c:647 [inline]
 perf_event_set_state kernel/events/core.c:666 [inline]
 event_sched_out+0x33d/0x830 kernel/events/core.c:2297
 group_sched_out+0xf0/0x1f0 kernel/events/core.c:2323
 ctx_sched_out+0x391/0x450 kernel/events/core.c:3293
 task_ctx_sched_out kernel/events/core.c:2691 [inline]
 perf_event_context_sched_out kernel/events/core.c:3498 [inline]
 __perf_event_task_sched_out+0x679/0xf00 kernel/events/core.c:3601
 perf_event_task_sched_out include/linux/perf_event.h:1245 [inline]
 prepare_task_switch+0x13b/0x140 kernel/sched/core.c:4796
 context_switch kernel/sched/core.c:4938 [inline]
 __schedule+0x397/0x6a0 kernel/sched/core.c:6296
 schedule+0x81/0xb0 kernel/sched/core.c:6369
 rwsem_down_read_slowpath kernel/locking/rwsem.c:1032 [inline]
 __down_read_common+0x2f5/0x4b0 kernel/locking/rwsem.c:1214
 __down_read kernel/locking/rwsem.c:1223 [inline]
 down_read+0x16/0x20 kernel/locking/rwsem.c:1463
 mmap_read_lock include/linux/mmap_lock.h:117 [inline]
 do_user_addr_fault+0x4df/0xb90 arch/x86/mm/fault.c:1348
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x91/0x290 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x1e/0x30
 copy_user_enhanced_fast_string+0xe/0x40
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
 copyin lib/iov_iter.c:166 [inline]
 copy_page_from_iter_iovec lib/iov_iter.c:310 [inline]
 copy_page_from_iter+0x25c/0x510 lib/iov_iter.c:900
 pipe_write+0x535/0xda0 fs/pipe.c:530
 call_write_iter include/linux/fs.h:2086 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x7f5/0x950 fs/read_write.c:590
 ksys_write+0xd9/0x190 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000007bddea -> 0x00000000007e7dc6

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18362 Comm: syz-executor.5 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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