================================================================== BUG: KCSAN: data-race in touch_atime / touch_atime write to 0xffff88812c42afe0 of 8 bytes by task 3213 on cpu 0: inode_set_atime_to_ts include/linux/fs.h:1566 [inline] inode_update_timestamps fs/inode.c:1878 [inline] generic_update_time fs/inode.c:1900 [inline] inode_update_time fs/inode.c:1920 [inline] touch_atime+0x1f3/0x350 fs/inode.c:1992 file_accessed include/linux/fs.h:2459 [inline] shmem_file_read_iter+0x4b3/0x550 mm/shmem.c:2900 do_iter_readv_writev+0x339/0x3e0 vfs_iter_read+0x172/0x3a0 fs/read_write.c:830 lo_read_simple drivers/block/loop.c:286 [inline] do_req_filebacked drivers/block/loop.c:496 [inline] loop_handle_cmd drivers/block/loop.c:1907 [inline] loop_process_work+0x7bc/0x1110 drivers/block/loop.c:1942 loop_rootcg_workfn+0x22/0x30 drivers/block/loop.c:1973 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0x465/0x990 kernel/workqueue.c:3335 worker_thread+0x526/0x730 kernel/workqueue.c:3416 kthread+0x1d1/0x210 kernel/kthread.c:388 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 read to 0xffff88812c42afe0 of 8 bytes by task 293 on cpu 1: inode_get_atime include/linux/fs.h:1560 [inline] inode_update_timestamps fs/inode.c:1875 [inline] generic_update_time fs/inode.c:1900 [inline] inode_update_time fs/inode.c:1920 [inline] touch_atime+0x1a0/0x350 fs/inode.c:1992 file_accessed include/linux/fs.h:2459 [inline] shmem_file_read_iter+0x4b3/0x550 mm/shmem.c:2900 do_iter_readv_writev+0x339/0x3e0 vfs_iter_read+0x172/0x3a0 fs/read_write.c:830 lo_read_simple drivers/block/loop.c:286 [inline] do_req_filebacked drivers/block/loop.c:496 [inline] loop_handle_cmd drivers/block/loop.c:1907 [inline] loop_process_work+0x7bc/0x1110 drivers/block/loop.c:1942 loop_workfn+0x31/0x40 drivers/block/loop.c:1966 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0x465/0x990 kernel/workqueue.c:3335 worker_thread+0x526/0x730 kernel/workqueue.c:3416 kthread+0x1d1/0x210 kernel/kthread.c:388 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 value changed: 0x000000002611ead9 -> 0x00000000269ec18a Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 293 Comm: kworker/u8:4 Not tainted 6.9.0-rc4-syzkaller-00266-g977b1ef51866 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: loop3 loop_workfn ==================================================================