RBP: 00007f4eb1bba1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fff040cbb9f R14: 00007f4eb1bba300 R15: 0000000000022000
 </TASK>
==================================================================
BUG: KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch

read-write to 0xffff88810010c3d0 of 8 bytes by task 11972 on cpu 1:
 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:1589 [inline]
 shmem_get_folio_gfp+0x493/0x1330 mm/shmem.c:1922
 shmem_get_folio mm/shmem.c:2053 [inline]
 shmem_write_begin+0xa2/0x1e0 mm/shmem.c:2545
 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:2186 [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 0xffff88810010c3d0 of 8 bytes by task 11958 on cpu 0:
 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:1589 [inline]
 shmem_get_folio_gfp+0x45c/0x1330 mm/shmem.c:1922
 shmem_get_folio mm/shmem.c:2053 [inline]
 shmem_write_begin+0xa2/0x1e0 mm/shmem.c:2545
 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:2186 [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: 0x0000000000001a75 -> 0x0000000000001a95

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11958 Comm: syz-executor.2 Not tainted 6.1.0-syzkaller-13139-gf9ff5644bcc0-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
==================================================================