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BUG: KCSAN: data-race in __lru_add_drain_all / lru_cache_add_inactive_or_unevictable

write to 0xffff888237d22528 of 1 bytes by task 4057 on cpu 1:
 pagevec_add include/linux/pagevec.h:74 [inline]
 pagevec_add_and_need_flush mm/swap.c:222 [inline]
 lru_cache_add mm/swap.c:452 [inline]
 lru_cache_add_inactive_or_unevictable+0xaa/0x270 mm/swap.c:484
 do_anonymous_page+0x716/0x8b0 mm/memory.c:3808
 handle_pte_fault mm/memory.c:4557 [inline]
 __handle_mm_fault mm/memory.c:4694 [inline]
 handle_mm_fault+0x7f5/0x1580 mm/memory.c:4792
 do_user_addr_fault+0x609/0xbe0 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1485 [inline]
 exc_page_fault+0x91/0x220 arch/x86/mm/fault.c:1541
 asm_exc_page_fault+0x1e/0x30
 __clear_user arch/x86/lib/usercopy_64.c:24 [inline]
 clear_user+0x60/0xa0 arch/x86/lib/usercopy_64.c:54
 iov_iter_zero+0x11b/0xb20 lib/iov_iter.c:900
 read_iter_zero+0x63/0x180 drivers/char/mem.c:492
 call_read_iter include/linux/fs.h:2157 [inline]
 do_iter_readv_writev+0x2fb/0x380 fs/read_write.c:727
 do_iter_read+0x192/0x5d0 fs/read_write.c:790
 vfs_readv fs/read_write.c:910 [inline]
 do_readv+0x171/0x2c0 fs/read_write.c:947
 __do_sys_readv fs/read_write.c:1038 [inline]
 __se_sys_readv fs/read_write.c:1035 [inline]
 __x64_sys_readv+0x41/0x50 fs/read_write.c:1035
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888237d22528 of 1 bytes by task 1135 on cpu 0:
 pagevec_count include/linux/pagevec.h:61 [inline]
 __lru_add_drain_all+0x12c/0x3e0 mm/swap.c:819
 lru_add_drain_all+0xc/0x10 mm/swap.c:841
 invalidate_bdev+0x56/0x80 block/bdev.c:87
 ext4_put_super+0x620/0x910 fs/ext4/super.c:1239
 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:1137
 __cleanup_mnt+0x15/0x20 fs/namespace.c:1144
 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:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0b -> 0x0c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1135 Comm: syz-executor.4 Not tainted 5.15.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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