================================================================== BUG: KCSAN: data-race in blkdev_open / queue_limits_commit_update read to 0xffff8881023d101c of 4 bytes by task 3387 on cpu 1: bdev_can_atomic_write include/linux/blkdev.h:1784 [inline] blkdev_open+0x161/0x290 block/fops.c:673 do_dentry_open+0x646/0xa20 fs/open.c:964 vfs_open+0x37/0x1e0 fs/open.c:1094 do_open fs/namei.c:3896 [inline] path_openat+0x1c5e/0x2170 fs/namei.c:4055 do_filp_open+0x109/0x230 fs/namei.c:4082 do_sys_openat2+0xa6/0x110 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0xf2/0x120 fs/open.c:1463 x64_sys_call+0x1af/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f write to 0xffff8881023d0f98 of 184 bytes by task 3893 on cpu 0: queue_limits_commit_update+0x4c/0x110 block/blk-settings.c:456 loop_configure+0x79c/0xa50 drivers/block/loop.c:1053 lo_ioctl+0x559/0x15d0 drivers/block/loop.c:-1 blkdev_ioctl+0x352/0x440 block/ioctl.c:704 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xce/0x140 fs/ioctl.c:893 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:893 x64_sys_call+0x19a8/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3893 Comm: syz.4.75 Not tainted 6.16.0-rc2-syzkaller-00087-g24770983ccfe #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ================================================================== loop4: detected capacity change from 0 to 512 EXT4-fs: Quota format mount options ignored when QUOTA feature is enabled EXT4-fs (loop4): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /11/bus supports timestamps until 2038-01-19 (0x7fffffff)