==================================================================
BUG: KCSAN: data-race in delete_from_page_cache_batch / folio_mapping

write to 0xffffea0004ef8398 of 8 bytes by task 27400 on cpu 0:
 page_cache_delete_batch mm/filemap.c:315 [inline]
 delete_from_page_cache_batch+0x301/0x760 mm/filemap.c:341
 truncate_inode_pages_range+0x305/0x8b0 mm/truncate.c:384
 truncate_inode_pages mm/truncate.c:469 [inline]
 truncate_pagecache+0x4f/0x70 mm/truncate.c:782
 ext4_setattr+0x7a0/0xb30 fs/ext4/inode.c:5452
 notify_change+0x924/0xbf0 fs/attr.c:410
 do_truncate+0xf7/0x140 fs/open.c:65
 handle_truncate fs/namei.c:3082 [inline]
 do_open fs/namei.c:3430 [inline]
 path_openat+0x1873/0x1f30 fs/namei.c:3559
 do_filp_open+0x105/0x220 fs/namei.c:3586
 do_sys_openat2+0xb5/0x2b0 fs/open.c:1214
 do_sys_open fs/open.c:1230 [inline]
 __do_sys_creat fs/open.c:1306 [inline]
 __se_sys_creat fs/open.c:1300 [inline]
 __x64_sys_creat+0x62/0x80 fs/open.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffea0004ef8398 of 8 bytes by task 1798 on cpu 1:
 folio_mapping+0x92/0x120 mm/util.c:722
 folio_evictable mm/internal.h:121 [inline]
 __pagevec_lru_add_fn+0x81/0x380 mm/swap.c:1043
 __pagevec_lru_add+0x1c3/0x270 mm/swap.c:1071
 lru_add_drain_cpu+0x6a/0x260 mm/swap.c:613
 lru_add_drain+0x21/0x60 mm/swap.c:717
 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+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff88813288e300 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1798 Comm: syz-fuzzer Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================