================================================================== BUG: KCSAN: data-race in atime_needs_update / inode_update_timestamps write to 0xffff8881160ff544 of 4 bytes by task 4339 on cpu 1: inode_set_mtime_to_ts include/linux/fs.h:1644 [inline] inode_update_timestamps+0x166/0x280 fs/inode.c:1999 generic_update_time fs/inode.c:2034 [inline] inode_update_time fs/inode.c:2054 [inline] __file_update_time fs/inode.c:2243 [inline] file_update_time+0x220/0x2b0 fs/inode.c:2273 shmem_file_write_iter+0x99/0xe0 mm/shmem.c:3218 iter_file_splice_write+0x5f1/0x980 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x160/0x2c0 fs/splice.c:1164 splice_direct_to_actor+0x302/0x670 fs/splice.c:1108 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 read to 0xffff8881160ff544 of 4 bytes by task 4336 on cpu 0: inode_get_mtime_nsec include/linux/fs.h:1630 [inline] inode_get_mtime include/linux/fs.h:1636 [inline] relatime_need_update fs/inode.c:1948 [inline] atime_needs_update+0x2aa/0x3e0 fs/inode.c:2094 touch_atime+0x4a/0x350 fs/inode.c:2109 file_accessed include/linux/fs.h:2528 [inline] shmem_file_splice_read+0x561/0x5c0 mm/shmem.c:3358 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: 0x0e29a482 -> 0x0ec23b02 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 4336 Comm: syz.4.180 Not tainted 6.12.0-rc1-syzkaller-00031-ge32cde8d2bd7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ==================================================================