==================================================================
BUG: KCSAN: data-race in __lru_add_drain_all / lru_cache_add

write to 0xffff888237d42528 of 1 bytes by task 7702 on cpu 1:
 pagevec_add include/linux/pagevec.h:74 [inline]
 pagevec_add_and_need_flush mm/swap.c:244 [inline]
 lru_cache_add+0x75/0x150 mm/swap.c:474
 add_to_page_cache_lru+0x150/0x1b0 mm/filemap.c:983
 pagecache_get_page+0x6a3/0x900 mm/filemap.c:1896
 find_or_create_page include/linux/pagemap.h:420 [inline]
 aio_setup_ring+0x2ad/0xc80 fs/aio.c:500
 ioctx_alloc+0x2b5/0xab0 fs/aio.c:759
 __do_sys_io_setup fs/aio.c:1328 [inline]
 __se_sys_io_setup+0x6a/0x1a0 fs/aio.c:1311
 __x64_sys_io_setup+0x2d/0x40 fs/aio.c:1311
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888237d42528 of 1 bytes by task 1796 on cpu 0:
 pagevec_count include/linux/pagevec.h:61 [inline]
 __lru_add_drain_all+0x12c/0x3e0 mm/swap.c:828
 lru_add_drain_all+0xc/0x10 mm/swap.c:850
 invalidate_bdev+0x50/0x70 fs/block_dev.c:96
 ext4_put_super+0x5d0/0x8c0 fs/ext4/super.c:1240
 generic_shutdown_super+0xe1/0x230 fs/super.c:465
 kill_block_super+0x4a/0x90 fs/super.c:1395
 deactivate_locked_super+0x65/0xd0 fs/super.c:335
 deactivate_super+0x85/0x90 fs/super.c:366
 cleanup_mnt+0x267/0x2d0 fs/namespace.c:1136
 __cleanup_mnt+0x15/0x20 fs/namespace.c:1143
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x49/0x90 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0c -> 0x07

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1796 Comm: syz-executor.1 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================