el0_svc_common.constprop.0+0x44/0xec arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x70/0x90 arch/arm64/kernel/syscall.c:181
 el0_svc+0x20/0x80 arch/arm64/kernel/entry-common.c:595
 el0t_64_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:613
 el0t_64_sync+0x1ac/0x1b0 arch/arm64/kernel/entry.S:572
------------[ cut here ]------------
WARNING: CPU: 0 PID: 16803 at block/genhd.c:537 device_add_disk+0x1bc/0x3b0 block/genhd.c:531
Modules linked in:
CPU: 0 PID: 16803 Comm: syz-executor.0 Not tainted 5.15.0-rc2-syzkaller-00221-g85736168463d #0
Hardware name: linux,dummy-virt (DT)
pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : device_add_disk+0x1bc/0x3b0 block/genhd.c:537
lr : device_add_disk+0xb0/0x3b0 block/genhd.c:533
sp : ffff8000189fbd00
x29: ffff8000189fbd00 x28: f1ff000005e60f40 x27: 0000000000000000
x26: 0000000000000000 x25: f2ff000005f769a0 x24: fdff000002e4d7c0
x23: fdff000002e4d780 x22: 0000000000000000 x21: 0000000000000000
x20: 00000000ffffffea x19: f9ff000026815800 x18: 00000000fffffffa
x17: 79732d3263722d30 x16: 2e35312e35206465 x15: ffff8000102d54fc
x14: ffff800010883c5c x13: ffff800011782a54 x12: ffff800011782580
x11: ffff8000100115f4 x10: ffff800011782a54 x9 : ffff800011782580
x8 : ffff8000100249a0 x7 : ffff800010024888 x6 : 000000000019acb0
x5 : f4ff000003b20200 x4 : ffff00007fbc5170 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000007
Call trace:
 device_add_disk+0x1bc/0x3b0 block/genhd.c:531
 add_disk include/linux/genhd.h:221 [inline]
 loop_add+0x23c/0x2a0 drivers/block/loop.c:2397
 loop_control_ioctl+0xac/0x1f0 drivers/block/loop.c:2512
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __arm64_sys_ioctl+0xa8/0xec fs/ioctl.c:860
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:52
 el0_svc_common.constprop.0+0x44/0xec arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x70/0x90 arch/arm64/kernel/syscall.c:181
 el0_svc+0x20/0x80 arch/arm64/kernel/entry-common.c:595
 el0t_64_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:613
 el0t_64_sync+0x1ac/0x1b0 arch/arm64/kernel/entry.S:572
---[ end trace e4a4a2cb26690c37 ]---