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BUG: KCSAN: data-race in __delete_from_page_cache / page_mapping

write to 0xffffea0004deaa18 of 8 bytes by task 4912 on cpu 0:
 page_cache_delete mm/filemap.c:145 [inline]
 __delete_from_page_cache+0x1b4/0x280 mm/filemap.c:232
 delete_from_page_cache+0x82/0x160 mm/filemap.c:266
 truncate_inode_page mm/truncate.c:219 [inline]
 truncate_inode_pages_range+0x9a3/0xad0 mm/truncate.c:397
 truncate_inode_pages+0x20/0x30 mm/truncate.c:425
 kill_bdev block/bdev.c:77 [inline]
 set_blocksize+0x24e/0x270 block/bdev.c:157
 sb_set_blocksize block/bdev.c:166 [inline]
 sb_min_blocksize+0x9d/0x120 block/bdev.c:182
 fat_fill_super+0xe95/0x2b10 fs/fat/inode.c:1649
 msdos_fill_super+0x29/0x30 fs/fat/namei_msdos.c:655
 mount_bdev+0x1e8/0x290 fs/super.c:1368
 msdos_mount+0x2d/0x40 fs/fat/namei_msdos.c:662
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498
 do_new_mount fs/namespace.c:2988 [inline]
 path_mount+0x11ec/0x1d20 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount+0x24b/0x2f0 fs/namespace.c:3516
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3516
 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 0xffffea0004deaa18 of 8 bytes by task 4986 on cpu 1:
 page_mapping+0x111/0x1c0 mm/util.c:725
 page_evictable mm/internal.h:83 [inline]
 __pagevec_lru_add_fn+0x82/0x490 mm/swap.c:1024
 __pagevec_lru_add+0x189/0x240 mm/swap.c:1052
 lru_cache_add mm/swap.c:453 [inline]
 lru_cache_add_inactive_or_unevictable+0x156/0x270 mm/swap.c:484
 wp_page_copy+0x803/0x10a0 mm/memory.c:3061
 do_wp_page+0x5a8/0xba0
 handle_pte_fault mm/memory.c:4577 [inline]
 __handle_mm_fault mm/memory.c:4694 [inline]
 handle_mm_fault+0x96e/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
 __put_user_nocheck_4+0x3/0x11
 schedule_tail+0x2c/0x40 kernel/sched/core.c:4880
 ret_from_fork+0x8/0x30

value changed: 0xffff8881010a8be8 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4986 Comm: syz-executor.1 Tainted: G        W         5.15.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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