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BUG: KCSAN: data-race in delete_from_page_cache_batch / page_mapping

write to 0xffffea00051f2398 of 8 bytes by task 11849 on cpu 1:
 page_cache_delete_batch mm/filemap.c:319 [inline]
 delete_from_page_cache_batch+0x30c/0x6c0 mm/filemap.c:349
 truncate_inode_pages_range+0x1d5/0xad0 mm/truncate.c:326
 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+0x2c/0xa0 block/bdev.c:166
 ext4_fill_super+0x2287/0x7830 fs/ext4/super.c:4327
 mount_bdev+0x1e8/0x290 fs/super.c:1368
 ext4_mount+0x2d/0x40 fs/ext4/super.c:6515
 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 0xffffea00051f2398 of 8 bytes by task 11852 on cpu 0:
 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_add_drain_cpu+0x6a/0x270 mm/swap.c:597
 lru_add_drain+0x28/0x40 mm/swap.c:701
 follow_page_pte mm/gup.c:590 [inline]
 follow_pmd_mask mm/gup.c:668 [inline]
 follow_pud_mask mm/gup.c:751 [inline]
 follow_p4d_mask mm/gup.c:777 [inline]
 follow_page_mask+0xe2d/0x10b0 mm/gup.c:836
 __get_user_pages+0x339/0xc50 mm/gup.c:1156
 populate_vma_page_range mm/gup.c:1490 [inline]
 __mm_populate+0x24d/0x370 mm/gup.c:1599
 do_mlock+0x37f/0x430 mm/mlock.c:688
 __do_sys_mlock2 mm/mlock.c:709 [inline]
 __se_sys_mlock2 mm/mlock.c:699 [inline]
 __x64_sys_mlock2+0x6e/0x90 mm/mlock.c:699
 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

value changed: 0xffff8881010bcbe8 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11852 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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