__invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:49 [inline]
 el0_svc_common.constprop.0+0x74/0x190 arch/arm64/kernel/syscall.c:159
 do_el0_svc+0x74/0x90 arch/arm64/kernel/syscall.c:198
 el0_svc+0x14/0x20 arch/arm64/kernel/entry-common.c:365
 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:381
 el0_sync+0x190/0x1c0 arch/arm64/kernel/entry.S:699
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4964 at block/genhd.c:749 __device_add_disk+0x470/0x4b4 block/genhd.c:761
Modules linked in:
CPU: 0 PID: 4964 Comm: syz-executor.1 Not tainted 5.11.0-syzkaller #0
Hardware name: linux,dummy-virt (DT)
pstate: 60400009 (nZCv daif +PAN -UAO -TCO BTYPE=--)
pc : __device_add_disk+0x470/0x4b4 block/genhd.c:749
lr : __device_add_disk+0x34c/0x4b4 block/genhd.c:748
sp : ffff80001492bce0
x29: ffff80001492bce0 x28: f5ff00000c1f1e00 
x27: 0000000000000000 x26: ffff800014481000 
x25: f3ff00002784b800 x24: f9ff000006ca1c0c 
x23: 0000000000000001 x22: 0000000000000000 
x21: 0000000000000000 x20: fbff000004e95e20 
x19: f9ff000006ca1c00 x18: 00000000fffffffb 
x17: 0000000000000000 x16: 0000000000000000 
x15: 0000000000000020 x14: ffffffffffffffff 
x13: 0000000000002ade x12: ffff80001492b680 
x11: ffff8000139bb920 x10: ffff8000139370a0 
x9 : ffff8000139ab450 x8 : ffff8000138fb450 
x7 : 0000000000000001 x6 : 0000000000000001 
x5 : 0000000000000030 x4 : 0000000000000001 
x3 : 0000000000000000 x2 : 0000000000000000 
x1 : f5ff00000c1f1e00 x0 : fffffffffffffff4 
Call trace:
 __device_add_disk+0x470/0x4b4 block/genhd.c:761
 device_add_disk+0x14/0x20 block/genhd.c:771
 add_disk include/linux/genhd.h:241 [inline]
 loop_add+0x1d8/0x240 drivers/block/loop.c:2163
 loop_control_ioctl drivers/block/loop.c:2258 [inline]
 loop_control_ioctl+0xc4/0x194 drivers/block/loop.c:2240
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __arm64_sys_ioctl+0xa8/0xec fs/ioctl.c:739
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:49 [inline]
 el0_svc_common.constprop.0+0x74/0x190 arch/arm64/kernel/syscall.c:159
 do_el0_svc+0x74/0x90 arch/arm64/kernel/syscall.c:198
 el0_svc+0x14/0x20 arch/arm64/kernel/entry-common.c:365
 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:381
 el0_sync+0x190/0x1c0 arch/arm64/kernel/entry.S:699