------------[ cut here ]------------
WARNING: CPU: 1 PID: 12794 at block/genhd.c:590 del_gendisk+0x70d/0x780 block/genhd.c:590
Modules linked in:
CPU: 1 PID: 12794 Comm: syz.0.2540 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:del_gendisk+0x70d/0x780 block/genhd.c:590
Code: 00 00 4c 89 f6 e8 43 b3 fa ff 4c 89 f7 be 01 00 00 00 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 f8 2d fd ff e8 23 68 ab fd <0f> 0b 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 44 89 e1 80 e1
RSP: 0000:ffffc90002f6fd88 EFLAGS: 00010287
RAX: ffffffff83cdba1d RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000c289000 RSI: 00000000000006bd RDI: 00000000000006be
RBP: ffff888061ac6c80 R08: ffffc90002f6fd87 R09: 1ffff920005edfb0
R10: dffffc0000000000 R11: fffff520005edfb1 R12: ffff888061ac6ca0
R13: ffff8881408ada58 R14: ffff888023d50000 R15: ffff888061ac6c00
FS:  00007f8fd67c06c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe5a6468000 CR3: 000000001fc56000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 loop_remove+0x3e/0xd0 drivers/block/loop.c:2453
 loop_control_remove drivers/block/loop.c:2510 [inline]
 loop_control_ioctl+0x46b/0x560 drivers/block/loop.c:2548
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8fd8587629
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8fd67c0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8fd8801090 RCX: 00007f8fd8587629
RDX: 0000000007000000 RSI: 0000000000004c81 RDI: 0000000000000004
RBP: 00007f8fd861db39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8fd8801128 R14: 00007f8fd8801090 R15: 00007ffc285bd598
 </TASK>