el0_svc_common.constprop.0+0x44/0xd0 arch/arm64/kernel/syscall.c:145
 do_el0_svc+0x74/0x90 arch/arm64/kernel/syscall.c:184
 el0_svc+0x2c/0x54 arch/arm64/kernel/entry-common.c:422
 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:438
 el0_sync+0x1a8/0x1c0 arch/arm64/kernel/entry.S:743
------------[ cut here ]------------
WARNING: CPU: 1 PID: 16764 at block/genhd.c:551 __device_add_disk+0x41c/0x460 block/genhd.c:563
Modules linked in:
CPU: 1 PID: 16764 Comm: syz-executor.1 Not tainted 5.12.0-syzkaller-08136-gd72cd4ad4174 #0
Hardware name: linux,dummy-virt (DT)
pstate: 60400009 (nZCv daif +PAN -UAO -TCO BTYPE=--)
pc : __device_add_disk+0x41c/0x460 block/genhd.c:551
lr : __device_add_disk+0x3e4/0x460 block/genhd.c:550
sp : ffff8000143f3cc0
x29: ffff8000143f3cc0 x28: f1ff000006385b80 
x27: 0000000000000000 x26: ffff800012a0a000 
x25: f1ff00000474b800 x24: f7ff0000047f9c0c 
x23: 0000000000000001 x22: 0000000000000000 
x21: 0000000000000000 x20: f3ff0000036a5e20 
x19: f7ff0000047f9c00 x18: 00000000fffffffa 
x17: 0000000000000000 x16: 0000000000000000 
x15: 0000000000000020 x14: ffffffffffffffff 
x13: 0000000000000cd3 x12: ffff8000143f3650 
x11: ffff80001279c058 x10: 00000000ffffe000 
x9 : ffff80001279c058 x8 : ffff8000126ec058 
x7 : ffff80001279c058 x6 : 0000000000000000 
x5 : ffff00007fbce948 x4 : 0000000000015ff5 
x3 : 0000000000000000 x2 : 0000000000000000 
x1 : f1ff000006385b80 x0 : fffffffffffffff4 
Call trace:
 __device_add_disk+0x41c/0x460 block/genhd.c:563
 device_add_disk+0x14/0x20 block/genhd.c:573
 add_disk include/linux/genhd.h:212 [inline]
 loop_add+0x1f4/0x25c drivers/block/loop.c:2172
 loop_control_ioctl drivers/block/loop.c:2268 [inline]
 loop_control_ioctl+0xc4/0x1b0 drivers/block/loop.c:2250
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl fs/ioctl.c:1055 [inline]
 __arm64_sys_ioctl+0xa8/0xec fs/ioctl.c:1055
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:52
 el0_svc_common.constprop.0+0x44/0xd0 arch/arm64/kernel/syscall.c:145
 do_el0_svc+0x74/0x90 arch/arm64/kernel/syscall.c:184
 el0_svc+0x2c/0x54 arch/arm64/kernel/entry-common.c:422
 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:438
 el0_sync+0x1a8/0x1c0 arch/arm64/kernel/entry.S:743
---[ end trace 59fa4ffcbad43e2d ]---