"mq-deadline" elevator initialization, failed -12, falling back to "none"
------------[ cut here ]------------
!rwb
WARNING: block/blk-wbt.c:784 at wbt_init_enable_default+0xcb/0x120 block/blk-wbt.c:784, CPU#0: syz.1.372/7685
Modules linked in:
CPU: 0 UID: 0 PID: 7685 Comm: syz.1.372 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+0xcb/0x120 block/blk-wbt.c:784
Code: df e8 d9 cc a2 06 4c 89 e7 e8 e1 38 00 00 48 89 df e8 29 56 a2 06 e8 04 76 2b fd 5b 5d 41 5c e9 9b 22 a4 06 e8 f6 75 2b fd 90 <0f> 0b 90 eb 81 e8 eb 75 2b fd 90 0f 0b 90 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc900047ff1a0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88805abcd000 RCX: 0000000000000040
RDX: ffff8880322bdac0 RSI: ffffffff84daf70a RDI: ffffffff8bfa9120
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff81000130 R12: ffff88802b0c9c98
R13: ffff88805abcd390 R14: ffff88802b0c9ca8 R15: ffff88805abcd090
FS:  00007f16f9c106c0(0000) GS:ffff8881245a5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fda381e5698 CR3: 0000000034d10000 CR4: 00000000003526f0
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]
 nbd_dev_add+0x77a/0xb10 drivers/block/nbd.c:1984
 nbd_genl_connect+0xb8d/0x1a40 drivers/block/nbd.c:2125
 genl_family_rcv_msg_doit+0x214/0x300 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x560/0x800 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2550
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xa54/0xc30 net/socket.c:2592
 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2646
 __sys_sendmsg+0x170/0x220 net/socket.c:2678
 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: 0033:0x7f16f8d9bf79
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:00007f16f9c10028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f16f9015fa0 RCX: 00007f16f8d9bf79
RDX: 0000000020040000 RSI: 0000200000000500 RDI: 0000000000000005
RBP: 00007f16f8e327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f16f9016038 R14: 00007f16f9015fa0 R15: 00007ffdb96cedf8
 </TASK>