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BUG: KCSAN: data-race in delete_from_page_cache_batch / page_mapping

read to 0xffffea0007cd8798 of 8 bytes by task 30828 on cpu 1:
 page_mapping+0x185/0x2a0 mm/util.c:665
 page_evictable+0x3a/0x100 mm/vmscan.c:4321
 move_pages_to_lru+0xed/0xa40 mm/vmscan.c:1890
 shrink_inactive_list+0x4c7/0x920 mm/vmscan.c:2006
 shrink_list mm/vmscan.c:2285 [inline]
 shrink_node_memcg+0x55c/0xf80 mm/vmscan.c:2603
 shrink_node+0x164/0xb30 mm/vmscan.c:2808
 shrink_zones mm/vmscan.c:3025 [inline]
 do_try_to_free_pages+0x242/0x940 mm/vmscan.c:3083
 try_to_free_mem_cgroup_pages+0x1fd/0x4c0 mm/vmscan.c:3383
 memory_high_write+0x14a/0x160 mm/memcontrol.c:6103
 cgroup_file_write+0x119/0x320 kernel/cgroup/cgroup.c:3754
 kernfs_fop_write+0x1f4/0x2e0 fs/kernfs/file.c:315
 __vfs_write+0x67/0xc0 fs/read_write.c:494
 vfs_write fs/read_write.c:558 [inline]
 vfs_write+0x18a/0x390 fs/read_write.c:542
 ksys_write+0xd5/0x1b0 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x4c/0x60 fs/read_write.c:620
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffffea0007cd8798 of 8 bytes by task 29469 on cpu 0:
 page_cache_delete_batch mm/filemap.c:326 [inline]
 delete_from_page_cache_batch+0x674/0x790 mm/filemap.c:357
 truncate_inode_pages_range+0x593/0x1120 mm/truncate.c:366
 truncate_inode_pages+0x2e/0x40 mm/truncate.c:476
 kill_bdev+0x89/0xb0 fs/block_dev.c:86
 __blkdev_put+0x138/0x420 fs/block_dev.c:1861
 blkdev_put+0x89/0x2f0 fs/block_dev.c:1929
 blkdev_close+0x52/0x60 fs/block_dev.c:1936
 __fput+0x1e1/0x520 fs/file_table.c:280
 ____fput+0x1f/0x30 fs/file_table.c:313
 task_work_run+0xf6/0x130 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x562/0x18f0 kernel/exit.c:817
 do_group_exit+0xb4/0x1c0 kernel/exit.c:921
 get_signal+0x2a2/0x1320 kernel/signal.c:2734
 do_signal+0x3b/0xbf0 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x250/0x2c0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode+0x180/0x1a0 arch/x86/entry/common.c:194
 swapgs_restore_regs_and_return_to_usermode+0x0/0x40

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 29469 Comm: syz-executor.4 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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