RBP: 00007fa3c1c79aa1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fa3c1d99038 R15: 00007fff6bdb86b8
 </TASK>
kobject_add_internal failed for md0 with -EEXIST, don't try to register things with the same name in the same directory.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7444 at block/genhd.c:549 device_add_disk+0x786/0xd60 block/genhd.c:547
Modules linked in:
CPU: 0 PID: 7444 Comm: syz.1.841 Not tainted 5.15.161-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:device_add_disk+0x786/0xd60 block/genhd.c:549
Code: 4c 89 e0 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 c6 04 00 00 41 8b 34 24 48 c7 c7 60 7b ef 8c e8 b1 a6 39 00 eb 05 e8 3a 4e 8e fd <0f> 0b bd 01 00 00 00 89 e8 48 83 c4 70 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90003727618 EFLAGS: 00010293
RAX: ffffffff83f20c96 RBX: 0000000000000009 RCX: ffff88801fd85940
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000103
RBP: dffffc0000000000 R08: ffffffff83f20c5b R09: ffffed100bd79a58
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807e639800
R13: ffff88805ebcd240 R14: 1ffff1100fcc7314 R15: 1ffff1100bd79a57
FS:  00007fa3c0e726c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f39ed9d2fa8 CR3: 0000000074a9b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 add_disk include/linux/genhd.h:203 [inline]
 md_alloc+0x8ad/0xd40 drivers/md/md.c:5783
 blk_request_module+0x181/0x1a0 block/genhd.c:687
 blkdev_get_no_open+0x39/0x190 block/bdev.c:740
 blkdev_get_by_dev+0x89/0xa50 block/bdev.c:804
 blkdev_open+0x138/0x2d0 block/fops.c:463
 do_dentry_open+0x807/0xfb0 fs/open.c:826
 do_open fs/namei.c:3608 [inline]
 path_openat+0x2705/0x2f20 fs/namei.c:3742
 do_filp_open+0x21c/0x460 fs/namei.c:3769
 do_sys_openat2+0x13b/0x500 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1280
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa3c1c0abd9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa3c0e72048 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fa3c1d99038 RCX: 00007fa3c1c0abd9
RDX: 0000000000000000 RSI: 0000000020000a80 RDI: ffffffffffffff9c
RBP: 00007fa3c1c79aa1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fa3c1d99038 R15: 00007fff6bdb86b8
 </TASK>