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BUG: KCSAN: data-race in blkdev_open / queue_limits_commit_update

read to 0xffff888101cdd2d0 of 4 bytes by task 4003 on cpu 1:
 bdev_can_atomic_write include/linux/blkdev.h:1855 [inline]
 blkdev_open+0x161/0x290 block/fops.c:692
 do_dentry_open+0x4be/0xa90 fs/open.c:947
 vfs_open+0x37/0x1e0 fs/open.c:1079
 do_open fs/namei.c:4699 [inline]
 path_openat+0x1b70/0x2050 fs/namei.c:4858
 do_file_open+0x16c/0x290 fs/namei.c:4887
 do_sys_openat2+0x94/0x130 fs/open.c:1364
 do_sys_open fs/open.c:1370 [inline]
 __do_sys_openat fs/open.c:1386 [inline]
 __se_sys_openat fs/open.c:1381 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1381
 x64_sys_call+0x1e39/0x3020 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff888101cdd240 of 192 bytes by task 5563 on cpu 0:
 queue_limits_commit_update+0x4b/0x160 block/blk-settings.c:564
 loop_configure+0x78c/0x9c0 drivers/block/loop.c:1064
 lo_ioctl+0x1e1/0x13a0 drivers/block/loop.c:1534
 blkdev_ioctl+0x387/0x460 block/ioctl.c:797
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583
 x64_sys_call+0x1563/0x3020 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 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: 5563 Comm: syz.5.566 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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loop5: detected capacity change from 0 to 512