------------[ cut here ]------------
!rwb
WARNING: block/blk-wbt.c:784 at wbt_init_enable_default+0xcb/0x120 block/blk-wbt.c:784, CPU#1: syz.7.343/8116
Modules linked in:
CPU: 1 UID: 0 PID: 8116 Comm: syz.7.343 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:wbt_init_enable_default+0xcb/0x120 block/blk-wbt.c:784
Code: df e8 59 8b a9 06 4c 89 e7 e8 e1 38 00 00 48 89 df e8 a9 14 a9 06 e8 14 5e 23 fd 5b 5d 41 5c e9 76 27 2b fc e8 06 5e 23 fd 90 <0f> 0b 90 eb 81 e8 fb 5d 23 fd 90 0f 0b 90 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc9000621fb70 EFLAGS: 00010283
RAX: 000000000000f164 RBX: ffff888043e84000 RCX: ffffc90016f0e000
RDX: 0000000000080000 RSI: ffffffff84e5199a RDI: ffffffff8c1adba0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802adec2b8
R13: ffff888043e84390 R14: ffff88802adec2c8 R15: ffff888043e84090
FS:  00007fe0ebc066c0(0000) GS:ffff888124453000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb7d0d46000 CR3: 0000000033104000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 blk_register_queue+0x39e/0x4e0 block/blk-sysfs.c:942
 __add_disk+0x73f/0xe40 block/genhd.c:528
 add_disk_fwnode+0x118/0x5c0 block/genhd.c:597
 add_disk include/linux/blkdev.h:785 [inline]
 loop_add+0x90b/0xb60 drivers/block/loop.c:2093
 loop_control_ioctl+0xae/0x620 drivers/block/loop.c:2220
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe0ead9bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe0ebc06028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe0eb016180 RCX: 00007fe0ead9bf79
RDX: 00000000000fffff RSI: 0000000000004c80 RDI: 0000000000000006
RBP: 00007fe0eae327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe0eb016218 R14: 00007fe0eb016180 R15: 00007ffe71299d98
 </TASK>