================================================================== BUG: KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch write to 0xffff88810004b3d0 of 8 bytes by task 23186 on cpu 1: 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+0x8be/0x13d0 mm/shmem.c:1917 shmem_getpage mm/shmem.c:155 [inline] shmem_write_begin+0x7e/0x100 mm/shmem.c:2494 generic_perform_write+0x196/0x3c0 mm/filemap.c:3656 __generic_file_write_iter+0x161/0x300 mm/filemap.c:3783 generic_file_write_iter+0x75/0x130 mm/filemap.c:3815 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x69d/0x770 fs/read_write.c:605 ksys_write+0xce/0x180 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 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 23175 on cpu 0: 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+0x84d/0x13d0 mm/shmem.c:1917 shmem_getpage mm/shmem.c:155 [inline] shmem_write_begin+0x7e/0x100 mm/shmem.c:2494 generic_perform_write+0x196/0x3c0 mm/filemap.c:3656 __generic_file_write_iter+0x161/0x300 mm/filemap.c:3783 generic_file_write_iter+0x75/0x130 mm/filemap.c:3815 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x69d/0x770 fs/read_write.c:605 ksys_write+0xce/0x180 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 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: 0x0000000000000d60 -> 0x0000000000000d80 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 23175 Comm: syz-executor.4 Not tainted 5.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================