el0_svc_common+0x40/0xfc arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x78/0x90 arch/arm64/kernel/syscall.c:181
 el0_svc+0x2c/0x54 arch/arm64/kernel/entry-common.c:511
 el0t_64_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:527
 el0t_64_sync+0x1b4/0x1b8 arch/arm64/kernel/entry.S:574
------------[ cut here ]------------
WARNING: CPU: 1 PID: 15979 at block/genhd.c:523 __device_add_disk+0x318/0x350 block/genhd.c:492
Modules linked in:
CPU: 1 PID: 15979 Comm: syz-executor.0 Not tainted 5.14.0-rc6-syzkaller-00196-gfa54d366a6e4 #0
Hardware name: linux,dummy-virt (DT)
pstate: 60400009 (nZCv daif +PAN -UAO -TCO BTYPE=--)
pc : __device_add_disk+0x318/0x350 block/genhd.c:523
lr : __device_add_disk+0x1d0/0x350 block/genhd.c:521
sp : ffff80001674bd00
x29: ffff80001674bd00 x28: f9ff0000239acc40 x27: 0000000000000000
x26: 0000000000000000 x25: 0000000000000000 x24: f4ff000003aec000
x23: 0000000000000001 x22: 0000000000000000 x21: 0000000000000000
x20: fdff000002d7e440 x19: f4ff000003afc800 x18: 00000000fffffffa
x17: 79732d3663722d30 x16: 2e34312e35206465 x15: 0000000000000020
x14: 0000000000000000 x13: 0000000000000a2a x12: ffff80001674b690
x11: ffff8000122ccd40 x10: 00000000ffffe000 x9 : ffff8000122ccd40
x8 : ffff80001221cd40 x7 : ffff8000122ccd40 x6 : 0000000000000000
x5 : ffff00007fbb09c8 x4 : ffff80001674bfe0 x3 : 0000000000000000
x2 : 0000000000000000 x1 : f9ff0000239acc40 x0 : fffffffffffffff4
Call trace:
 __device_add_disk+0x318/0x350 block/genhd.c:492
 device_add_disk+0x14/0x20 block/genhd.c:548
 add_disk include/linux/genhd.h:217 [inline]
 loop_add+0x208/0x254 drivers/block/loop.c:2395
 loop_control_ioctl+0xa8/0x1e0 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+0xa8/0xec fs/ioctl.c:1055
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x40/0xfc arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x78/0x90 arch/arm64/kernel/syscall.c:181
 el0_svc+0x2c/0x54 arch/arm64/kernel/entry-common.c:511
 el0t_64_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:527
 el0t_64_sync+0x1b4/0x1b8 arch/arm64/kernel/entry.S:574
---[ end trace 0c418299eb92d273 ]---