================================================================== BUG: KCSAN: data-race in shmem_file_splice_read / shmem_file_splice_read write to 0xffff888119f99170 of 8 bytes by task 4774 on cpu 0: shmem_file_splice_read+0x438/0x5c0 mm/shmem.c:3345 do_splice_read fs/splice.c:985 [inline] splice_direct_to_actor+0x269/0x670 fs/splice.c:1089 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0xd7/0x150 fs/splice.c:1233 do_sendfile+0x39b/0x970 fs/read_write.c:1388 __do_sys_sendfile64 fs/read_write.c:1455 [inline] __se_sys_sendfile64 fs/read_write.c:1441 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1441 x64_sys_call+0xed5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f write to 0xffff888119f99170 of 8 bytes by task 4784 on cpu 1: shmem_file_splice_read+0x438/0x5c0 mm/shmem.c:3345 do_splice_read fs/splice.c:985 [inline] splice_direct_to_actor+0x269/0x670 fs/splice.c:1089 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0xd7/0x150 fs/splice.c:1233 do_sendfile+0x39b/0x970 fs/read_write.c:1388 __do_sys_sendfile64 fs/read_write.c:1455 [inline] __se_sys_sendfile64 fs/read_write.c:1441 [inline] __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1441 x64_sys_call+0xed5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x000000000000cfa8 -> 0x000000000000cfcc Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 4784 Comm: syz.2.515 Tainted: G W 6.12.0-rc6-syzkaller-00169-g906bd684e4b1 #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ==================================================================