------------[ cut here ]------------
wbt_init(disk)
WARNING: block/blk-wbt.c:741 at wbt_init_enable_default+0x53/0x60 block/blk-wbt.c:741, CPU#0: syz.9.2108/15531
Modules linked in:
CPU: 0 UID: 0 PID: 15531 Comm: syz.9.2108 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:wbt_init_enable_default+0x53/0x60 block/blk-wbt.c:741
Code: fd 5b 5d e9 6a c7 37 fc e8 7a 64 2e fd 48 89 ef e8 a2 fa ff ff 31 ff 89 c3 89 c6 e8 17 5f 2e fd 85 db 74 d8 e8 5e 64 2e fd 90 <0f> 0b 90 eb cd 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d9cf5a0 EFLAGS: 00010287
RAX: 000000000002e744 RBX: 00000000fffffff4 RCX: ffffc9001cf88000
RDX: 0000000000080000 RSI: ffffffff84d879c2 RDI: ffff8880323a8000
RBP: ffff88807e068000 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000fffffff4 R11: 0000000000000000 R12: ffff888029020000
R13: ffff88807e068390 R14: ffff888029020010 R15: ffff88807e068090
FS:  00007fb19f8ad6c0(0000) GS:ffff8881245dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30403ff8 CR3: 00000000212f4000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 blk_register_queue+0x39e/0x4e0 block/blk-sysfs.c:935
 __add_disk+0x73f/0xe40 block/genhd.c:528
 add_disk_fwnode+0x118/0x5c0 block/genhd.c:597
 add_mtd_blktrans_dev+0xd0b/0x1520 drivers/mtd/mtd_blkdevs.c:382
 mtdblock_add_mtd+0x1cc/0x270 drivers/mtd/mtdblock.c:333
 blktrans_notify_add drivers/mtd/mtd_blkdevs.c:464 [inline]
 blktrans_notify_add+0xa2/0xf0 drivers/mtd/mtd_blkdevs.c:456
 add_mtd_device+0xbe3/0x1750 drivers/mtd/mtdcore.c:820
 mtd_add_partition+0x30a/0x660 drivers/mtd/mtdpart.c:279
 mtdchar_blkpg_ioctl+0x207/0x250 drivers/mtd/mtdchar.c:562
 mtdchar_ioctl+0x1670/0x1fd0 drivers/mtd/mtdchar.c:1218
 mtdchar_unlocked_ioctl+0xb0/0xf0 drivers/mtd/mtdchar.c:1241
 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+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb19e99af79
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:00007fb19f8ad028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb19ec15fa0 RCX: 00007fb19e99af79
RDX: 0000200000000180 RSI: 0000000000001269 RDI: 0000000000000004
RBP: 00007fb19ea316e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb19ec16038 R14: 00007fb19ec15fa0 R15: 00007ffcb8d3b3c8
 </TASK>