------------[ cut here ]------------
!rwb
WARNING: block/blk-wbt.c:785 at wbt_init_enable_default+0x164/0x1c0 block/blk-wbt.c:785, CPU#0: syz.0.1/5914
Modules linked in:
CPU: 0 UID: 0 PID: 5914 Comm: syz.0.1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:wbt_init_enable_default+0x164/0x1c0 block/blk-wbt.c:785
Code: 8a 22 fd 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc 4c 89 f7 e8 0e 0f 8e fd eb 83 4c 89 f7 e8 04 0f 8e fd eb d0 e8 ed 89 22 fd 90 <0f> 0b 90 e9 e9 fe ff ff e8 df 89 22 fd 90 0f 0b 90 48 b8 00 00 00
RSP: 0000:ffffc900042c7570 EFLAGS: 00010287
RAX: 000000000001f0ff RBX: ffff88802aa1c000 RCX: ffffc90006b29000
RDX: 0000000000080000 RSI: ffffffff84e584d3 RDI: ffffffff8c1af520
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff827362d4 R12: ffff88802a6ec2b8
R13: ffff88801f75002c R14: ffff88802aa1c390 R15: ffff88802a6ec2c8
FS:  00007fee1aff66c0(0000) GS:ffff88812434c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555801699e8 CR3: 000000007d1d4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 blk_register_queue+0x42c/0x590 block/blk-sysfs.c:943
 __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+0xb1a/0x17a0 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+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fee1cd9c799
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:00007fee1aff6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fee1d016090 RCX: 00007fee1cd9c799
RDX: 0000000000000000 RSI: 0000000000001269 RDI: 0000000000000004
RBP: 00007fee1ce32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fee1d016128 R14: 00007fee1d016090 R15: 00007fff8f18b338
 </TASK>