el0_svc_common+0xcc/0x1f4 arch/arm64/kernel/syscall.c:145
 do_el0_svc+0xa4/0xd0 arch/arm64/kernel/syscall.c:184
 el0_svc+0x24/0x3c arch/arm64/kernel/entry-common.c:511
 el0t_64_sync_handler+0x1a4/0x1ac arch/arm64/kernel/entry-common.c:527
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:574
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8054 at block/genhd.c:523 register_disk block/genhd.c:408 [inline]
WARNING: CPU: 1 PID: 8054 at block/genhd.c:523 __device_add_disk+0x7f8/0xa74 block/genhd.c:527
Modules linked in:
CPU: 1 PID: 8054 Comm: syz-executor.1 Not tainted 5.14.0-rc3-syzkaller-00253-gf3438b4c4e69 #0
Hardware name: linux,dummy-virt (DT)
pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
pc : __device_add_disk+0x7f8/0xa74 block/genhd.c:523
lr : __device_add_disk+0x558/0xa74 block/genhd.c:521
sp : ffff80001ad07bb0
x29: ffff80001ad07bb0 x28: ffff00000a89d800 x27: 1fffe00001513b10
x26: ffff00000cd86340 x25: 1fffe00001513b00 x24: ffff00000a89d890
x23: 1fffe00001513b14 x22: ffff00000cd867ac x21: ffff00000a89d808
x20: ffff80001487ba60 x19: 0000000000000000 x18: ffff00006aa70bc8
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 1ffff000035a0dea x13: 0000000000000001 x12: ffff700002bb8127
x11: 1ffff00002bb8126 x10: ffff700002bb8126 x9 : dfff800000000000
x8 : ffff800015dc0933 x7 : 0000000000000001 x6 : ffff00000bf34000
x5 : ffff800015dc0930 x4 : 0000000000000dc0 x3 : 0000000000000000
x2 : 0000000000000000 x1 : ffff00000d1e0000 x0 : fffffffffffffff4
Call trace:
 register_disk block/genhd.c:408 [inline]
 __device_add_disk+0x7f8/0xa74 block/genhd.c:527
 device_add_disk+0x14/0x20 block/genhd.c:548
 add_disk include/linux/genhd.h:217 [inline]
 loop_add+0x52c/0x750 drivers/block/loop.c:2395
 loop_control_ioctl+0x108/0x380 drivers/block/loop.c:2492
 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+0x120/0x190 fs/ioctl.c:1055
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x6c/0x260 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0xcc/0x1f4 arch/arm64/kernel/syscall.c:145
 do_el0_svc+0xa4/0xd0 arch/arm64/kernel/syscall.c:184
 el0_svc+0x24/0x3c arch/arm64/kernel/entry-common.c:511
 el0t_64_sync_handler+0x1a4/0x1ac arch/arm64/kernel/entry-common.c:527
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:574
irq event stamp: 564
hardirqs last  enabled at (563): [<ffff800014583e78>] exit_to_kernel_mode+0x38/0x230 arch/arm64/kernel/entry-common.c:71
hardirqs last disabled at (564): [<ffff800014584604>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:296
softirqs last  enabled at (552): [<ffff8000100109a4>] _stext+0x9a4/0x1050
softirqs last disabled at (541): [<ffff800010162530>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (541): [<ffff800010162530>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (541): [<ffff800010162530>] __irq_exit_rcu+0x470/0x520 kernel/softirq.c:636
---[ end trace 74521663e92bf023 ]---