syzbot

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BUG: KCSAN: data-race in __lru_add_drain_all / folio_add_lru

read-write to 0xffff888237c27968 of 1 bytes by task 21312 on cpu 0:
 pagevec_add include/linux/pagevec.h:75 [inline]
 pagevec_add_and_need_flush mm/swap.c:234 [inline]
 folio_add_lru+0x5a/0x160 mm/swap.c:466
 lru_cache_add+0x3b/0xe0 mm/folio-compat.c:109
 lru_cache_add_inactive_or_unevictable+0x44/0x60 mm/swap.c:488
 wp_page_copy+0x7d8/0x1460 mm/memory.c:3171
 do_wp_page+0x76f/0xe10
 handle_pte_fault mm/memory.c:4921 [inline]
 __handle_mm_fault mm/memory.c:5042 [inline]
 handle_mm_fault+0x5fb/0xa90 mm/memory.c:5140
 do_user_addr_fault+0x4cd/0x940 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x27/0x30
 __put_user_nocheck_4+0x3/0x11
 schedule_tail+0x41/0x50 kernel/sched/core.c:5086
 ret_from_fork+0x8/0x30

read to 0xffff888237c27968 of 1 bytes by task 1819 on cpu 1:
 pagevec_count include/linux/pagevec.h:62 [inline]
 __lru_add_drain_all+0x118/0x3e0 mm/swap.c:826
 lru_add_drain_all+0xc/0x10 mm/swap.c:849
 invalidate_bdev+0x56/0x80 block/bdev.c:87
 invalidate_disk+0x25/0xb0 block/genhd.c:688
 __loop_clr_fd+0x176/0x3c0 drivers/block/loop.c:1159
 loop_clr_fd drivers/block/loop.c:1252 [inline]
 lo_ioctl+0xd8c/0x1290 drivers/block/loop.c:1558
 blkdev_ioctl+0x20e/0x440 block/ioctl.c:614
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1819 Comm: syz-executor.0 Not tainted 5.19.0-rc5-syzkaller-00049-gc1084b6c5620-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
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