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BUG: KCSAN: data-race in delete_from_page_cache_batch / page_mapping

write to 0xffffea0004a251d8 of 8 bytes by task 380 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]
 blkdev_flush_mapping+0xde/0x240 block/bdev.c:658
 blkdev_put_whole block/bdev.c:689 [inline]
 blkdev_put+0x3ab/0x4c0 block/bdev.c:953
 blkdev_close+0x45/0x50 block/fops.c:460
 __fput+0x295/0x520 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffea0004a251d8 of 8 bytes by task 8393 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
 exit_mmap+0x218/0x470 mm/mmap.c:3166
 __mmput+0x27/0x1d0 kernel/fork.c:1115
 mmput+0x3d/0x50 kernel/fork.c:1136
 exit_mm+0x2ec/0x3e0 kernel/exit.c:501
 do_exit+0x3ef/0x14a0 kernel/exit.c:812
 do_group_exit+0xce/0x1a0 kernel/exit.c:922
 get_signal+0xf93/0x15d0 kernel/signal.c:2868
 arch_do_signal_or_restart+0x8c/0x280 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff888101097ba8 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8393 Comm: syz-executor.2 Not tainted 5.15.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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