R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488
kobject_add_internal failed for 7:0 with -EEXIST, don't try to register things with the same name in the same directory.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8431 at block/genhd.c:549 __device_add_disk+0xf56/0x1230 block/genhd.c:549
Modules linked in:
CPU: 0 PID: 8431 Comm: syz-executor483 Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__device_add_disk+0xf56/0x1230 block/genhd.c:549
Code: f1 ff ff e8 ec a3 b5 fd 0f 0b e9 26 fa ff ff 48 89 7c 24 20 e8 db a3 b5 fd 0f 0b 48 8b 7c 24 20 e9 5e f5 ff ff e8 ca a3 b5 fd <0f> 0b e9 1a ff ff ff 4c 89 ef e8 eb 46 fa fd e9 fb f1 ff ff 48 8b
RSP: 0018:ffffc90001b2fd30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8880226c8100 RSI: ffffffff83be6e06 RDI: 0000000000000003
RBP: ffff888030427c00 R08: 0000000000000000 R09: ffffffff9022e8ff
R10: ffffffff83be6d1e R11: 0000000000084087 R12: 00000000ffffffef
R13: ffff888030427ca0 R14: ffff88803df94150 R15: ffff88802f090000
FS:  0000000000521300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc821ae000 CR3: 0000000022f89000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 add_disk include/linux/genhd.h:212 [inline]
 loop_add+0x671/0x900 drivers/block/loop.c:2162
 loop_control_ioctl drivers/block/loop.c:2258 [inline]
 loop_control_ioctl+0x16c/0x4c0 drivers/block/loop.c:2240
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl fs/ioctl.c:1055 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x43ee49
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc5b11a788 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043ee49
RDX: 0000000000200000 RSI: 0000000000004c80 RDI: 0000000000000003
RBP: 0000000000402e30 R08: 0000000000000000 R09: 0000000000400488
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402ec0
R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488