------------[ cut here ]------------
!rwb
WARNING: block/blk-wbt.c:785 at wbt_init_enable_default+0x164/0x1c0 block/blk-wbt.c:785, CPU#0: syz.8.5982/31432
Modules linked in:
CPU: 0 UID: 0 PID: 31432 Comm: syz.8.5982 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026
RIP: 0010:wbt_init_enable_default+0x164/0x1c0 block/blk-wbt.c:785
Code: 66 20 fd 5b 5d 41 5c 41 5d 41 5e e9 46 ba aa 06 4c 89 f7 e8 2e e8 8c fd eb 83 4c 89 f7 e8 24 e8 8c fd eb d0 e8 ed 65 20 fd 90 <0f> 0b 90 e9 e9 fe ff ff e8 df 65 20 fd 90 0f 0b 90 48 b8 00 00 00
RSP: 0018:ffffc90003207570 EFLAGS: 00010287
RAX: 000000000002a481 RBX: ffff8880578a3000 RCX: ffffc9002b846000
RDX: 0000000000080000 RSI: ffffffff84e851b3 RDI: ffffffff8c1b0420
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff82750974 R12: ffff888029a52620
R13: ffff88802eb324ec R14: ffff8880578a3390 R15: ffff888029a52630
FS:  00007fd78b08c6c0(0000) GS:ffff888124345000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0bcc3e7158 CR3: 0000000060195000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 blk_register_queue+0x42c/0x590 block/blk-sysfs.c:949
 __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: 0033:0x7fd78a19c799
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:00007fd78b08c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd78a416090 RCX: 00007fd78a19c799
RDX: 0000200000000180 RSI: 0000000000001269 RDI: 000000000000000a
RBP: 00007fd78a232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd78a416128 R14: 00007fd78a416090 R15: 00007ffc62881c28
 </TASK>