[syzbot] [fs?] WARNING in fanotify_handle_event (2)

[syzbot <syzbot+318aab2cf26bb7d40228@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    906bd684e4b1 Merge tag 'spi-fix-v6.12-rc6' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=177d4ea7980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=64aa0d9945bd5c1
dashboard link: https://syzkaller.appspot.com/bug?extid=318aab2cf26bb7d40228
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1168dd87980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10fd4ea7980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-906bd684.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/88c5c4ba7e33/vmlinux-906bd684.xz
kernel image: https://storage.googleapis.com/syzbot-assets/07094e69f47b/bzImage-906bd684.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/643aa6b4830a/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+318aab2cf26bb7d40228@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 128
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5308 at fs/notify/fanotify/fanotify.h:216 fanotify_info_copy_name fs/notify/fanotify/fanotify.h:216 [inline]
WARNING: CPU: 0 PID: 5308 at fs/notify/fanotify/fanotify.h:216 fanotify_alloc_name_event fs/notify/fanotify/fanotify.c:646 [inline]
WARNING: CPU: 0 PID: 5308 at fs/notify/fanotify/fanotify.h:216 fanotify_alloc_event fs/notify/fanotify/fanotify.c:810 [inline]
WARNING: CPU: 0 PID: 5308 at fs/notify/fanotify/fanotify.h:216 fanotify_handle_event+0x2eba/0x3c50 fs/notify/fanotify/fanotify.c:936
Modules linked in:
CPU: 0 UID: 0 PID: 5308 Comm: syz-executor207 Not tainted 6.12.0-rc6-syzkaller-00169-g906bd684e4b1 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:fanotify_info_copy_name fs/notify/fanotify/fanotify.h:216 [inline]
RIP: 0010:fanotify_alloc_name_event fs/notify/fanotify/fanotify.c:646 [inline]
RIP: 0010:fanotify_alloc_event fs/notify/fanotify/fanotify.c:810 [inline]
RIP: 0010:fanotify_handle_event+0x2eba/0x3c50 fs/notify/fanotify/fanotify.c:936
Code: f6 ff ff e8 58 a4 6e ff 90 0f 0b 90 e9 c0 f7 ff ff e8 4a a4 6e ff 90 0f 0b 90 4c 8b 6c 24 10 e9 e7 f8 ff ff e8 37 a4 6e ff 90 <0f> 0b 90 4c 8b 6c 24 10 e9 04 fb ff ff e8 24 a4 6e ff 90 0f 0b 90
RSP: 0018:ffffc9000d0473e0 EFLAGS: 00010293
RAX: ffffffff82263629 RBX: ffffc9000d047844 RCX: ffff888000848000
RDX: 0000000000000000 RSI: 0000000000000ffd RDI: 00000000000000ff
RBP: ffffc9000d0475e0 R08: ffffffff82262f60 R09: 0000000000000000
R10: ffff888043bd8038 R11: ffffffff821d7890 R12: ffff888043bd8000
R13: 0000000000000ffd R14: ffff888043bd8000 R15: dffffc0000000000
FS:  0000555581eb6380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020004000 CR3: 000000003600e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 send_to_group fs/notify/fsnotify.c:394 [inline]
 fsnotify+0x1657/0x1f60 fs/notify/fsnotify.c:607
 __fsnotify_parent+0x4f5/0x5e0 fs/notify/fsnotify.c:264
 fsnotify_parent include/linux/fsnotify.h:96 [inline]
 fsnotify_file include/linux/fsnotify.h:131 [inline]
 fsnotify_open include/linux/fsnotify.h:401 [inline]
 vfs_open+0x28d/0x330 fs/open.c:1095
 do_open fs/namei.c:3774 [inline]
 path_openat+0x2c84/0x3590 fs/namei.c:3933
 do_filp_open+0x235/0x490 fs/namei.c:3960
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_creat fs/open.c:1508 [inline]
 __se_sys_creat fs/open.c:1502 [inline]
 __x64_sys_creat+0x123/0x170 fs/open.c:1502
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde2034f6b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff3d0c3658 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007fff3d0c3828 RCX: 00007fde2034f6b9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020003500
RBP: 00007fde203c3610 R08: 00007fff3d0c3828 R09: 00007fff3d0c3828
R10: 00007fff3d0c3828 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff3d0c3818 R14: 0000000000000001 R15: 0000000000000001
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup