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BUG: KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch

write to 0xffff88810004b3d0 of 8 bytes by task 2633 on cpu 0:
 percpu_counter_add_batch+0x9c/0xd0 lib/percpu_counter.c:91
 percpu_counter_add include/linux/percpu_counter.h:56 [inline]
 shmem_inode_acct_block mm/shmem.c:228 [inline]
 shmem_alloc_and_acct_page mm/shmem.c:1582 [inline]
 shmem_getpage_gfp+0x8c4/0x13e0 mm/shmem.c:1905
 shmem_getpage mm/shmem.c:155 [inline]
 shmem_write_begin+0x7e/0x100 mm/shmem.c:2482
 generic_perform_write+0x1a6/0x3d0 mm/filemap.c:3755
 __generic_file_write_iter+0x161/0x300 mm/filemap.c:3882
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3914
 call_write_iter include/linux/fs.h:2155 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:729
 do_iter_write+0x192/0x5c0 fs/read_write.c:855
 vfs_writev fs/read_write.c:928 [inline]
 do_pwritev+0x1e5/0x3a0 fs/read_write.c:1025
 __do_sys_pwritev fs/read_write.c:1072 [inline]
 __se_sys_pwritev fs/read_write.c:1067 [inline]
 __x64_sys_pwritev+0x54/0x60 fs/read_write.c:1067
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810004b3d0 of 8 bytes by task 2627 on cpu 1:
 percpu_counter_read include/linux/percpu_counter.h:72 [inline]
 __percpu_counter_compare+0x28/0x1a0 lib/percpu_counter.c:225
 percpu_counter_compare include/linux/percpu_counter.h:51 [inline]
 shmem_inode_acct_block mm/shmem.c:225 [inline]
 shmem_alloc_and_acct_page mm/shmem.c:1582 [inline]
 shmem_getpage_gfp+0x853/0x13e0 mm/shmem.c:1905
 shmem_getpage mm/shmem.c:155 [inline]
 shmem_write_begin+0x7e/0x100 mm/shmem.c:2482
 generic_perform_write+0x1a6/0x3d0 mm/filemap.c:3755
 __generic_file_write_iter+0x161/0x300 mm/filemap.c:3882
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3914
 call_write_iter include/linux/fs.h:2155 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:729
 do_iter_write+0x192/0x5c0 fs/read_write.c:855
 vfs_writev fs/read_write.c:928 [inline]
 do_pwritev+0x1e5/0x3a0 fs/read_write.c:1025
 __do_sys_pwritev fs/read_write.c:1072 [inline]
 __se_sys_pwritev fs/read_write.c:1067 [inline]
 __x64_sys_pwritev+0x54/0x60 fs/read_write.c:1067
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000de0 -> 0x0000000000000e00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2627 Comm: syz-executor.4 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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