==================================================================
BUG: KCSAN: data-race in blkdev_open / queue_limits_commit_update

read to 0xffff888101dfcf40 of 4 bytes by task 15126 on cpu 1:
 bdev_can_atomic_write include/linux/blkdev.h:1773 [inline]
 blkdev_open+0x153/0x280 block/fops.c:669
 do_dentry_open+0x49f/0xa60 fs/open.c:996
 vfs_open+0x37/0x1e0 fs/open.c:1101
 do_open fs/namei.c:4837 [inline]
 path_openat+0xc01/0x10d0 fs/namei.c:5000
 do_file_open+0x16c/0x290 fs/namei.c:5029
 do_sys_openat2+0xa0/0x130 fs/open.c:1417
 do_sys_open fs/open.c:1423 [inline]
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __x64_sys_openat+0xf2/0x120 fs/open.c:1434
 x64_sys_call+0x1f72/0x2550 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff888101dfceb0 of 192 bytes by task 32071 on cpu 0:
 queue_limits_commit_update+0x4b/0x160 block/blk-settings.c:564
 loop_configure+0x78a/0x9c0 drivers/block/loop.c:1086
 lo_ioctl+0x1e3/0x1430 drivers/block/loop.c:1556
 blkdev_ioctl+0x387/0x460 block/ioctl.c:798
 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+0x239d/0x2550 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 32071 Comm: syz.6.6361 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
==================================================================
loop6: detected capacity change from 0 to 512
EXT4-fs error (device loop6): dx_probe:791: inode #2: comm syz.6.6361: Directory hole found for htree index block 0
loop6: lost file I/O error report for ino 2 type 5 pos 0x0 len 0x0 error -117
EXT4-fs (loop6): Cannot turn on journaled quota: type 1: error -117
netlink: 'syz.6.6361': attribute type 10 has an invalid length.