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BUG: KCSAN: data-race in delete_from_page_cache_batch / page_mapping

write to 0xffffea00050f96d8 of 8 bytes by task 29058 on cpu 0:
 page_cache_delete_batch mm/filemap.c:318 [inline]
 delete_from_page_cache_batch+0x2fc/0x690 mm/filemap.c:349
 truncate_inode_pages_range+0x1a5/0xa70 mm/truncate.c:326
 truncate_inode_pages+0x20/0x30 mm/truncate.c:424
 kill_bdev fs/block_dev.c:86 [inline]
 set_blocksize+0x24e/0x270 fs/block_dev.c:166
 sb_set_blocksize fs/block_dev.c:175 [inline]
 sb_min_blocksize+0x9d/0x120 fs/block_dev.c:191
 isofs_fill_super+0x6f3/0x1940 fs/isofs/inode.c:657
 mount_bdev+0x1e8/0x290 fs/super.c:1368
 isofs_mount+0x2d/0x40 fs/isofs/inode.c:1566
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498
 do_new_mount fs/namespace.c:2905 [inline]
 path_mount+0x11d4/0x1ce0 fs/namespace.c:3235
 do_mount fs/namespace.c:3248 [inline]
 __do_sys_mount fs/namespace.c:3456 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3433
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3433
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffea00050f96d8 of 8 bytes by task 29065 on cpu 1:
 page_mapping+0x111/0x1c0 mm/util.c:706
 page_evictable mm/internal.h:83 [inline]
 __pagevec_lru_add_fn+0x82/0x490 mm/swap.c:1033
 __pagevec_lru_add+0x1c0/0x2b0 mm/swap.c:1061
 lru_add_drain_cpu+0x6d/0x270 mm/swap.c:619
 lru_add_drain+0x28/0x40 mm/swap.c:724
 exit_mmap+0x199/0x400 mm/mmap.c:3203
 __mmput+0x27/0x1c0 kernel/fork.c:1096
 mmput+0x3d/0x50 kernel/fork.c:1117
 free_bprm+0xce/0x1f0 fs/exec.c:1478
 kernel_execve+0x4e9/0x640 fs/exec.c:1975
 call_usermodehelper_exec_async+0x1d8/0x290 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

value changed: 0xffff88810139a5d8 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 29065 Comm: kworker/u4:6 Tainted: G        W         5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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