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BUG: KCSAN: data-race in __delete_from_page_cache / page_mapping

write to 0xffffea00048b7518 of 8 bytes by task 2678 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+0x3e/0x50 mm/truncate.c:219
 shmem_undo_range+0x290/0xea0 mm/shmem.c:955
 shmem_truncate_range mm/shmem.c:1058 [inline]
 shmem_evict_inode+0x115/0x5b0 mm/shmem.c:1140
 evict+0x1c8/0x3c0 fs/inode.c:588
 iput_final fs/inode.c:1664 [inline]
 iput+0x430/0x580 fs/inode.c:1690
 dentry_unlink_inode+0x273/0x290 fs/dcache.c:376
 __dentry_kill+0x2af/0x4e0 fs/dcache.c:582
 dput+0xc6/0x360 fs/dcache.c:888
 __fput+0x3e4/0x520 fs/file_table.c:293
 ____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 0xffffea00048b7518 of 8 bytes by task 2681 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_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
 free_bprm+0xce/0x1f0 fs/exec.c:1483
 kernel_execve+0x4e9/0x640 fs/exec.c:1980
 call_usermodehelper_exec_async+0x1d8/0x290 kernel/umh.c:112
 ret_from_fork+0x1f/0x30

value changed: 0xffff8881067cfb50 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2681 Comm: kworker/u4:2 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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