loop3: detected capacity change from 0 to 264192 ================================================================== BUG: KCSAN: data-race in shmem_getattr / shmem_getpage_gfp write to 0xffff88813a4e26b0 of 8 bytes by task 5311 on cpu 0: shmem_getpage_gfp+0xe88/0x12c0 mm/shmem.c:1944 shmem_getpage mm/shmem.c:150 [inline] shmem_file_read_iter+0x1b2/0x5d0 mm/shmem.c:2547 call_read_iter include/linux/fs.h:2156 [inline] do_iter_readv_writev+0x2fb/0x380 fs/read_write.c:723 do_iter_read+0x192/0x5d0 fs/read_write.c:786 vfs_iter_read+0x4c/0x70 fs/read_write.c:828 lo_read_simple drivers/block/loop.c:284 [inline] do_req_filebacked drivers/block/loop.c:499 [inline] loop_handle_cmd drivers/block/loop.c:1857 [inline] loop_process_work+0x70b/0x1280 drivers/block/loop.c:1897 loop_rootcg_workfn+0x1b/0x20 drivers/block/loop.c:1928 process_one_work+0x3fc/0x980 kernel/workqueue.c:2298 worker_thread+0x616/0xa70 kernel/workqueue.c:2445 kthread+0x2c7/0x2e0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 read to 0xffff88813a4e26b0 of 8 bytes by task 14325 on cpu 1: shmem_getattr+0x40/0x240 mm/shmem.c:1068 vfs_getattr_nosec+0x153/0x2f0 fs/stat.c:123 vfs_getattr+0x4d/0x60 fs/stat.c:160 loop_get_status+0x162/0x240 drivers/block/loop.c:1341 loop_get_status64 drivers/block/loop.c:1433 [inline] lo_ioctl+0x1eb/0x1270 drivers/block/loop.c:1578 blkdev_ioctl+0x20e/0x440 block/ioctl.c:609 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000001 -> 0x0000000000000002 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 14325 Comm: syz-executor.3 Not tainted 5.16.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================