Re: [syzbot] [mtd?] WARNING in release_mtd_partition

[syzbot <syzbot+074732af3fc6c528f8a0@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in sysfs_create_file_ns

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fb7345a5fa0 R15: 00007fffd549f308
 </TASK>
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6732 at fs/sysfs/file.c:376 sysfs_create_file_ns+0x148/0x1d0 fs/sysfs/file.c:376
Modules linked in:
CPU: 1 UID: 0 PID: 6732 Comm: syz.0.16 Not tainted 6.13.0-syzkaller-ga86bf2283d2c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:sysfs_create_file_ns+0x148/0x1d0 fs/sysfs/file.c:376
Code: e9 03 80 3c 01 00 75 7f 48 8b 7d 30 4d 89 e9 4c 89 e6 8b 4c 24 38 44 8b 44 24 48 e8 02 fb ff ff 89 c5 eb 0e e8 a9 4a 5f ff 90 <0f> 0b 90 bd ea ff ff ff e8 9b 4a 5f ff 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc900031678b0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff9200062cf17 RCX: ffffffff8643ddcb
RDX: ffff888031e29e00 RSI: ffffffff82599ea7 RDI: ffff8880615d91a0
RBP: ffff8880615d91a0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8f24c880
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880615d91d0
FS:  00007fb7352246c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f98dcaf950 CR3: 000000001e686000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 sysfs_create_file include/linux/sysfs.h:788 [inline]
 sysfs_create_files+0x6c/0x1d0 fs/sysfs/file.c:390
 mtd_add_partition_attrs drivers/mtd/mtdpart.c:238 [inline]
 mtd_add_partition+0x32b/0x650 drivers/mtd/mtdpart.c:283
 mtdchar_blkpg_ioctl+0x20d/0x250 drivers/mtd/mtdchar.c:562
 mtdchar_ioctl+0xbbe/0x2050 drivers/mtd/mtdchar.c:1216
 mtdchar_unlocked_ioctl+0xb0/0xf0 drivers/mtd/mtdchar.c:1239
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl fs/ioctl.c:892 [inline]
 __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb73438cda9
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:00007fb735224038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb7345a5fa0 RCX: 00007fb73438cda9
RDX: 0000000000000008 RSI: 0000000000001269 RDI: 0000000000000003
RBP: 00007fb735224090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fb7345a5fa0 R15: 00007fffd549f308
 </TASK>


Tested on:

commit:         a86bf228 Merge tag 'pull-misc' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1451fddf980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=714e7008e8c086ea
dashboard link: https://syzkaller.appspot.com/bug?extid=074732af3fc6c528f8a0
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=17c1fddf980000