================================================================== BUG: KCSAN: data-race in shmem_file_splice_read / shmem_setattr write to 0xffff888129b99040 of 8 bytes by task 23113 on cpu 1: i_size_write include/linux/fs.h:932 [inline] shmem_setattr+0x706/0x840 mm/shmem.c:1186 notify_change+0x866/0x8e0 fs/attr.c:499 do_truncate+0x116/0x150 fs/open.c:66 do_sys_ftruncate+0x2ba/0x3b0 fs/open.c:194 __do_sys_ftruncate fs/open.c:205 [inline] __se_sys_ftruncate fs/open.c:203 [inline] __x64_sys_ftruncate+0x33/0x40 fs/open.c:203 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff888129b99040 of 8 bytes by task 23102 on cpu 0: i_size_read include/linux/fs.h:910 [inline] shmem_file_splice_read+0x1dd/0x600 mm/shmem.c:2962 vfs_splice_read fs/splice.c:993 [inline] splice_direct_to_actor+0x28c/0x690 fs/splice.c:1069 do_splice_direct+0x10d/0x190 fs/splice.c:1194 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1316 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0xbd/0x150 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x0000000000000199 -> 0x000000000000000d Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 23102 Comm: syz-executor.0 Not tainted 6.6.0-rc7-syzkaller-00137-g750b95887e56 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 ==================================================================