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BUG: KCSAN: data-race in delete_from_page_cache_batch / page_mapping

write to 0xffffea00061e5ed8 of 8 bytes by task 7781 on cpu 0:
 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 mm/truncate.c:425 [inline]
 truncate_pagecache+0x4f/0x70 mm/truncate.c:735
 ext4_setattr+0xa5b/0xef0 fs/ext4/inode.c:5515
 notify_change+0x8a3/0xac0 fs/attr.c:410
 do_truncate+0xf7/0x140 fs/open.c:64
 handle_truncate fs/namei.c:3084 [inline]
 do_open fs/namei.c:3432 [inline]
 path_openat+0x1925/0x1ec0 fs/namei.c:3561
 do_filp_open+0x105/0x220 fs/namei.c:3588
 do_sys_openat2+0xb5/0x2b0 fs/open.c:1200
 do_sys_open fs/open.c:1216 [inline]
 __do_sys_creat fs/open.c:1290 [inline]
 __se_sys_creat fs/open.c:1284 [inline]
 __x64_sys_creat+0x62/0x80 fs/open.c:1284
 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 0xffffea00061e5ed8 of 8 bytes by task 1096 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:1011
 __pagevec_lru_add+0x189/0x240 mm/swap.c:1039
 lru_add_drain_cpu+0x6d/0x280 mm/swap.c:597
 lru_add_drain+0x28/0x40 mm/swap.c:702
 madvise_free_single_vma mm/madvise.c:728 [inline]
 madvise_dontneed_free mm/madvise.c:822 [inline]
 madvise_vma mm/madvise.c:996 [inline]
 do_madvise+0x8ae/0x1140 mm/madvise.c:1202
 __do_sys_madvise mm/madvise.c:1228 [inline]
 __se_sys_madvise mm/madvise.c:1226 [inline]
 __x64_sys_madvise+0x5d/0x70 mm/madvise.c:1226
 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: 0xffff88817c87d730 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1096 Comm: syz-fuzzer Not tainted 5.15.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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