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BUG: KCSAN: data-race in delete_from_page_cache_batch / page_mapping

write to 0xffffea00005f8bd8 of 8 bytes by task 28626 on cpu 1:
 page_cache_delete_batch mm/filemap.c:327 [inline]
 delete_from_page_cache_batch+0x37b/0x810 mm/filemap.c:358
 truncate_inode_pages_range+0x482/0x10c0 mm/truncate.c:366
 truncate_inode_pages+0x20/0x30 mm/truncate.c:476
 kill_bdev fs/block_dev.c:86 [inline]
 set_blocksize+0x286/0x2a0 fs/block_dev.c:150
 sb_set_blocksize fs/block_dev.c:159 [inline]
 sb_min_blocksize+0x9d/0x120 fs/block_dev.c:175
 isofs_fill_super+0x6b1/0x18b0 fs/isofs/inode.c:656
 mount_bdev+0x1e2/0x280 fs/super.c:1366
 isofs_mount+0x2d/0x40 fs/isofs/inode.c:1565
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x190 fs/super.c:1496
 do_new_mount fs/namespace.c:2878 [inline]
 path_mount+0x119d/0x1c10 fs/namespace.c:3208
 do_mount fs/namespace.c:3221 [inline]
 __do_sys_mount fs/namespace.c:3429 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3406
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3406
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffea00005f8bd8 of 8 bytes by task 28639 on cpu 0:
 page_mapping+0x13b/0x200 mm/util.c:706
 page_evictable mm/internal.h:84 [inline]
 __pagevec_lru_add_fn+0xb1/0x550 mm/swap.c:996
 __pagevec_lru_add+0x19a/0x280 mm/swap.c:1026
 lru_add_drain_cpu+0x6a/0x250 mm/swap.c:616
 lru_add_drain+0x30/0x70 mm/swap.c:720
 exit_mmap+0x199/0x400 mm/mmap.c:3215
 __mmput+0xa2/0x220 kernel/fork.c:1083
 mmput+0x38/0x40 kernel/fork.c:1104
 free_bprm+0xce/0x1f0 fs/exec.c:1477
 kernel_execve+0x4ff/0x650 fs/exec.c:1971
 call_usermodehelper_exec_async+0x1a1/0x250 kernel/umh.c:110
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28639 Comm: kworker/u4:3 Not tainted 5.11.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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