el0_svc_common+0x40/0xdc arch/arm64/kernel/syscall.c:145
 do_el0_svc+0x78/0x90 arch/arm64/kernel/syscall.c:184
 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: 7291 at block/genhd.c:523 __device_add_disk+0x318/0x350 block/genhd.c:492
Modules linked in:
CPU: 1 PID: 7291 Comm: syz-executor.0 Not tainted 5.14.0-rc2-syzkaller-00323-gd8079fac1681 #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 : ffff8000134bbd00
x29: ffff8000134bbd00 x28: fdff000006acdb80 x27: 0000000000000000
x26: 0000000000000000 x25: 0000000000000000 x24: f9ff000003ecb000
x23: 0000000000000001 x22: 0000000000000000 x21: 0000000000000000
x20: f3ff000002d66440 x19: f2ff000003bf4000 x18: 00000000fffffffb
x17: 7a79732d3263722d x16: 302e34312e352064 x15: 0000000000000020
x14: 0000000000000000 x13: 0000000000000a07 x12: ffff8000134bb690
x11: ffff8000122bcd38 x10: 00000000ffffe000 x9 : ffff8000122bcd38
x8 : ffff80001220cd38 x7 : ffff8000122bcd38 x6 : 0000000000000000
x5 : ffff00007fbb0988 x4 : ffff8000134bbfe0 x3 : 0000000000000000
x2 : 0000000000000000 x1 : fdff000006acdb80 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:2329
 loop_control_ioctl+0xa8/0x1e0 drivers/block/loop.c:2426
 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+0x40/0xdc arch/arm64/kernel/syscall.c:145
 do_el0_svc+0x78/0x90 arch/arm64/kernel/syscall.c:184
 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 d55fbfdbec5a74b3 ]---