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BUG: KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch

read-write to 0xffff8881001123d0 of 8 bytes by task 26040 on cpu 0:
 percpu_counter_add_batch+0x9a/0x110 lib/percpu_counter.c:91
 percpu_counter_add include/linux/percpu_counter.h:59 [inline]
 shmem_inode_acct_block mm/shmem.c:213 [inline]
 shmem_alloc_and_acct_folio mm/shmem.c:1587 [inline]
 shmem_get_folio_gfp+0x493/0x1330 mm/shmem.c:1920
 shmem_get_folio mm/shmem.c:2051 [inline]
 shmem_write_begin+0xa2/0x1e0 mm/shmem.c:2543
 generic_perform_write+0x1d4/0x3f0 mm/filemap.c:3772
 __generic_file_write_iter+0xe3/0x280 mm/filemap.c:3900
 generic_file_write_iter+0x79/0x1c0 mm/filemap.c:3932
 call_write_iter include/linux/fs.h:2189 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x468/0x760 fs/read_write.c:584
 ksys_write+0xe8/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881001123d0 of 8 bytes by task 26037 on cpu 1:
 percpu_counter_read include/linux/percpu_counter.h:91 [inline]
 __percpu_counter_compare+0x27/0x1a0 lib/percpu_counter.c:242
 percpu_counter_compare include/linux/percpu_counter.h:54 [inline]
 shmem_inode_acct_block mm/shmem.c:210 [inline]
 shmem_alloc_and_acct_folio mm/shmem.c:1587 [inline]
 shmem_get_folio_gfp+0x45c/0x1330 mm/shmem.c:1920
 shmem_get_folio mm/shmem.c:2051 [inline]
 shmem_write_begin+0xa2/0x1e0 mm/shmem.c:2543
 generic_perform_write+0x1d4/0x3f0 mm/filemap.c:3772
 __generic_file_write_iter+0xe3/0x280 mm/filemap.c:3900
 generic_file_write_iter+0x79/0x1c0 mm/filemap.c:3932
 call_write_iter include/linux/fs.h:2189 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x468/0x760 fs/read_write.c:584
 ksys_write+0xe8/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000002862 -> 0x0000000000002882

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 26037 Comm: syz-executor.4 Not tainted 6.2.0-rc5-syzkaller-00199-g5af6ce704936-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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