mtd: partition "" is out of reach -- disabled
ftl_cs: FTL header not found.
"mq-deadline" elevator initialization, failed -12, falling back to "none"
------------[ cut here ]------------
WARNING: block/blk-wbt.c:741 at wbt_init_enable_default+0x4e/0x60 block/blk-wbt.c:741, CPU#0: syz.1.1493/11216
Modules linked in:
CPU: 0 UID: 0 PID: 11216 Comm: syz.1.1493 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:wbt_init_enable_default+0x4e/0x60 block/blk-wbt.c:741
Code: 07 5b 5d e9 74 cb 20 fd e8 6f cb 20 fd 48 89 ef e8 77 fa ff ff 31 ff 89 c3 89 c6 e8 fc c5 20 fd 85 db 74 dd e8 53 cb 20 fd 90 <0f> 0b 90 eb d2 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90
RSP: 0018:ffffc9000358f5b0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 00000000fffffff4 RCX: ffffffff849e1b14
RDX: ffff888022f924c0 RSI: ffffffff849e1b1d RDI: 0000000000000005
RBP: ffff8880253ef000 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000fffffff4 R11: ffff888022f92ff0 R12: ffff8881062ed5c8
R13: ffff8880253ef390 R14: ffff8881062ed5d8 R15: ffff8880253ef090
FS:  00007f73d71a96c0(0000) GS:ffff8880d68f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f009ae41f98 CR3: 000000003a670000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 blk_register_queue+0x39e/0x4e0 block/blk-sysfs.c:935
 __add_disk+0x74a/0xf00 block/genhd.c:528
 add_disk_fwnode+0x13f/0x5d0 block/genhd.c:597
 add_mtd_blktrans_dev+0xd13/0x15a0 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+0xb87/0x1830 drivers/mtd/mtdcore.c:820
 mtd_add_partition+0x30c/0x670 drivers/mtd/mtdpart.c:279
 mtdchar_blkpg_ioctl+0x20b/0x250 drivers/mtd/mtdchar.c:562
 mtdchar_ioctl+0xc09/0x20f0 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+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f73d638f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f73d71a9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f73d65e5fa0 RCX: 00007f73d638f7c9
RDX: 0000200000000080 RSI: 0000000000001269 RDI: 0000000000000004
RBP: 00007f73d6413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f73d65e6038 R14: 00007f73d65e5fa0 R15: 00007ffcbd084c58
 </TASK>