------------[ cut here ]------------
WARNING: drivers/mtd/mtdpart.c:37 at release_mtd_partition+0x71/0x90 drivers/mtd/mtdpart.c:37, CPU#2: syz.5.2754/13919
Modules linked in:
CPU: 2 UID: 0 PID: 13919 Comm: syz.5.2754 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:release_mtd_partition+0x71/0x90 drivers/mtd/mtdpart.c:37
Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 1e 48 8b 7b 38 e8 cf 13 d3 fb 48 89 df 5b 5d e9 c5 13 d3 fb e8 a0 fd 74 fb 90 <0f> 0b 90 eb c2 e8 15 d3 de fb eb db 48 89 ef e8 0b d3 de fb eb a5
RSP: 0018:ffffc9000298f828 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888037f57000 RCX: ffffffff8b73304d
RDX: ffff8880270924c0 RSI: ffffffff8649eb10 RDI: ffff888037f57000
RBP: ffff888037f57650 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000009 R11: ffff888027092ff0 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88803f19cb60 R15: 0000000000000000
FS:  00007f38621616c0(0000) GS:ffff8880d6af5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3862140d58 CR3: 000000004acc9000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 mtd_release+0xa0/0xd0 drivers/mtd/mtdcore.c:101
 device_release+0xa4/0x240 drivers/base/core.c:2565
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1ef/0x6f0 lib/kobject.c:737
 put_device+0x1f/0x30 drivers/base/core.c:3797
 add_mtd_device+0xc47/0x1830 drivers/mtd/mtdcore.c:802
 mtd_add_partition+0x30c/0x670 drivers/mtd/mtdpart.c:279
 mtdchar_blkpg_ioctl+0x20b/0x250 drivers/mtd/mtdchar.c:562
 mtdchar_ioctl+0xc09/0x20f0 drivers/mtd/mtdchar.c:1218
 mtdchar_unlocked_ioctl+0xb0/0xf0 drivers/mtd/mtdchar.c:1241
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f386138f7c9
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:00007f3862161038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f38615e5fa0 RCX: 00007f386138f7c9
RDX: 0000200000000080 RSI: 0000000000001269 RDI: 0000000000000004
RBP: 00007f3862161090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f38615e6038 R14: 00007f38615e5fa0 R15: 00007ffdecab9db8
 </TASK>