__invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall arch/arm64/kernel/syscall.c:49 [inline] el0_svc_common.constprop.0+0x60/0x120 arch/arm64/kernel/syscall.c:129 do_el0_svc+0x74/0x90 arch/arm64/kernel/syscall.c:168 el0_svc+0x2c/0x54 arch/arm64/kernel/entry-common.c:416 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:432 el0_sync+0x18c/0x1c0 arch/arm64/kernel/entry.S:699 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 9843 at block/genhd.c:617 __device_add_disk+0x444/0x490 block/genhd.c:629 Modules linked in: CPU: 0 PID: 9843 Comm: syz-executor.0 Not tainted 5.12.0-rc6-syzkaller #0 Hardware name: linux,dummy-virt (DT) pstate: 60400009 (nZCv daif +PAN -UAO -TCO BTYPE=--) pc : __device_add_disk+0x444/0x490 block/genhd.c:617 lr : __device_add_disk+0x40c/0x490 block/genhd.c:616 sp : ffff800014333cd0 x29: ffff800014333cd0 x28: fdff00001f825b80 x27: 0000000000000000 x26: ffff8000129ff000 x25: f6ff00000448e000 x24: f9ff00002123d40c x23: 0000000000000001 x22: 0000000000000000 x21: 0000000000000000 x20: f3ff0000036738a0 x19: f9ff00002123d400 x18: 00000000fffffffb x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000020 x14: ffffffffffffffff x13: 0000000000000c4b x12: ffff800014333670 x11: ffff80001278be70 x10: 00000000ffffe000 x9 : ffff80001278be70 x8 : ffff8000126dbe70 x7 : ffff80001278be70 x6 : 0000000000000000 x5 : ffff00007fbb6948 x4 : 0000000000015ff5 x3 : 0000000000000000 x2 : 0000000000000000 x1 : fdff00001f825b80 x0 : fffffffffffffff4 Call trace: __device_add_disk+0x444/0x490 block/genhd.c:629 device_add_disk+0x14/0x20 block/genhd.c:639 add_disk include/linux/genhd.h:231 [inline] loop_add+0x1f4/0x260 drivers/block/loop.c:2172 loop_control_ioctl drivers/block/loop.c:2268 [inline] loop_control_ioctl+0xc4/0x1b0 drivers/block/loop.c:2250 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+0x60/0x120 arch/arm64/kernel/syscall.c:129 do_el0_svc+0x74/0x90 arch/arm64/kernel/syscall.c:168 el0_svc+0x2c/0x54 arch/arm64/kernel/entry-common.c:416 el0_sync_handler+0x1a4/0x1b0 arch/arm64/kernel/entry-common.c:432 el0_sync+0x18c/0x1c0 arch/arm64/kernel/entry.S:699 ---[ end trace c30c59c831c9a964 ]---