================================================================== BUG: KCSAN: data-race in shmem_getpage_gfp / shmem_write_end write to 0xffff88813703d710 of 8 bytes by task 21769 on cpu 1: i_size_write include/linux/fs.h:886 [inline] shmem_write_end+0x59/0x380 mm/shmem.c:2535 generic_perform_write+0x264/0x3f0 mm/filemap.c:3749 __generic_file_write_iter+0xe3/0x280 mm/filemap.c:3866 generic_file_write_iter+0x79/0x1c0 mm/filemap.c:3898 do_iter_write+0x494/0x750 fs/read_write.c:855 vfs_iter_write+0x4c/0x70 fs/read_write.c:896 iter_file_splice_write+0x44a/0x7c0 fs/splice.c:686 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:931 splice_direct_to_actor+0x305/0x620 fs/splice.c:886 do_splice_direct+0xfb/0x180 fs/splice.c:974 do_sendfile+0x3bf/0x910 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1311 [inline] __se_sys_sendfile64 fs/read_write.c:1303 [inline] __x64_sys_sendfile64+0xb9/0x150 fs/read_write.c:1303 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 0xffff88813703d710 of 8 bytes by task 21778 on cpu 0: i_size_read include/linux/fs.h:864 [inline] shmem_getpage_gfp+0x1a3/0x1750 mm/shmem.c:1854 shmem_getpage mm/shmem.c:150 [inline] shmem_file_read_iter+0x161/0x6c0 mm/shmem.c:2592 call_read_iter include/linux/fs.h:2181 [inline] generic_file_splice_read+0xde/0x2b0 fs/splice.c:309 do_splice_to fs/splice.c:793 [inline] splice_direct_to_actor+0x26c/0x620 fs/splice.c:865 do_splice_direct+0xfb/0x180 fs/splice.c:974 do_sendfile+0x3bf/0x910 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1311 [inline] __se_sys_sendfile64 fs/read_write.c:1303 [inline] __x64_sys_sendfile64+0xb9/0x150 fs/read_write.c:1303 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: 0x0000000000000337 -> 0x0000000000000338 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 21778 Comm: syz-executor.5 Tainted: G W 6.0.0-rc4-syzkaller-00059-gd2ec799d1c1b-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 ==================================================================