EXT4-fs (loop2): invalid inodes per group: 115488
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BUG: KCSAN: data-race in __pagevec_lru_add / lru_add_drain_all

write to 0xffff88813bd27970 of 1 bytes by task 5552 on cpu 1:
 pagevec_reinit include/linux/pagevec.h:60 [inline]
 __pagevec_lru_add+0x24b/0x280 mm/swap.c:1031
 lru_cache_add+0x102/0x160 mm/swap.c:465
 lru_cache_add_inactive_or_unevictable+0x46/0x160 mm/swap.c:496
 wp_page_copy+0x7f7/0x1490 mm/memory.c:2905
 do_wp_page+0x482/0x6c0 arch/x86/include/asm/atomic.h:95
 handle_pte_fault mm/memory.c:4405 [inline]
 __handle_mm_fault mm/memory.c:4522 [inline]
 handle_mm_fault+0x1407/0x17b0 mm/memory.c:4620
 do_user_addr_fault+0x433/0x830 arch/x86/mm/fault.c:1393
 handle_page_fault arch/x86/mm/fault.c:1450 [inline]
 exc_page_fault+0x94/0x2a0 arch/x86/mm/fault.c:1506
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:580

read to 0xffff88813bd27970 of 1 bytes by task 5540 on cpu 0:
 pagevec_count include/linux/pagevec.h:65 [inline]
 lru_add_drain_all+0x108/0x3c0 mm/swap.c:823
 invalidate_bdev+0x50/0x70 fs/block_dev.c:96
 __loop_clr_fd+0x253/0x5a0 drivers/block/loop.c:1238
 loop_clr_fd drivers/block/loop.c:1334 [inline]
 lo_ioctl+0x9db/0x11d0 drivers/block/loop.c:1692
 blkdev_ioctl+0x1d0/0x3c0 block/ioctl.c:576
 block_ioctl+0x6d/0x80 fs/block_dev.c:1647
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5540 Comm: syz-executor.2 Not tainted 5.11.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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