------------[ cut here ]------------
WARNING: CPU: 1 PID: 5320 at block/genhd.c:554 device_add_disk+0x8d6/0xde0 block/genhd.c:552
Modules linked in:
CPU: 1 PID: 5320 Comm: syz.2.325 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:device_add_disk+0x8d6/0xde0 block/genhd.c:554
Code: 04 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 8f 03 00 00 8b 33 48 c7 c7 00 f4 70 8d e8 b1 3d 37 00 eb 05 e8 ea 04 a6 fd <0f> 0b 41 bd 01 00 00 00 44 89 e8 48 83 c4 50 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000397f470 EFLAGS: 00010246
RAX: ffffffff83d31e76 RBX: ffff888060116c00 RCX: 0000000000080000
RDX: ffffc90004294000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 000000000000001f R08: ffff88802d3d01db R09: 1ffff11005a7a03b
R10: dffffc0000000000 R11: ffffed1005a7a03c R12: ffff888017c9c6c0
R13: ffff888060116d50 R14: dffffc0000000000 R15: ffff888017c9c6c0
FS:  00007f0e9dff26c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3271dff8 CR3: 0000000023c52000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 add_mtd_blktrans_dev+0xfb1/0x13f0 drivers/mtd/mtd_blkdevs.c:387
 mtdblock_add_mtd+0x186/0x240 drivers/mtd/mtdblock.c:333
 blktrans_notify_add+0x95/0xe0 drivers/mtd/mtd_blkdevs.c:464
 add_mtd_device+0xd40/0x1260 drivers/mtd/mtdcore.c:693
 mtd_add_partition+0x25d/0x420 drivers/mtd/mtdpart.c:273
 mtdchar_blkpg_ioctl+0x283/0x2b0 drivers/mtd/mtdchar.c:562
 mtdchar_ioctl+0x14cb/0x1d70 drivers/mtd/mtdchar.c:1010
 mtdchar_unlocked_ioctl+0xad/0xd0 drivers/mtd/mtdchar.c:1033
 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: 0033:0x7f0e9fd9a1d9
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:00007f0e9dff2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0ea0021fa0 RCX: 00007f0e9fd9a1d9
RDX: 00002000000000c0 RSI: 0000000000001269 RDI: 0000000000000009
RBP: 00007f0e9fe31888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0ea0022038 R14: 00007f0ea0021fa0 R15: 00007ffd58ce6978
 </TASK>