Re: [syzbot] [net?] BUG: corrupted list in ptp_open

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
BUG: corrupted list in ptp_release

list_del corruption. prev->next should be ffff88807bfb5048, but was ffff888065aa5048. (prev=ffff88814b1c1048)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:62!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6347 Comm: syz-executor.4 Not tainted 6.6.0-rc6-next-20231020-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:__list_del_entry_valid_or_report+0x11f/0x1b0 lib/list_debug.c:62
Code: 9f e9 8a e8 a3 a3 3a fd 0f 0b 48 89 ca 48 c7 c7 c0 9f e9 8a e8 92 a3 3a fd 0f 0b 48 89 c2 48 c7 c7 20 a0 e9 8a e8 81 a3 3a fd <0f> 0b 48 89 d1 48 c7 c7 a0 a0 e9 8a 48 89 c2 e8 6d a3 3a fd 0f 0b
RSP: 0018:ffffc90004807e00 EFLAGS: 00010082
RAX: 000000000000006d RBX: ffff88807bfb4000 RCX: ffffffff816bb8d9
RDX: 0000000000000000 RSI: ffffffff816c4d42 RDI: 0000000000000005
RBP: ffff88802857b5e0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000001 R11: 0000000000000001 R12: 0000000000000246
R13: ffff88807bfb5048 R14: ffff88807bfb5008 R15: ffff88807bfb5050
FS:  0000555556c77480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fde0ff98000 CR3: 00000000247f4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:124 [inline]
 __list_del_entry include/linux/list.h:215 [inline]
 list_del include/linux/list.h:229 [inline]
 ptp_release+0xc4/0x2b0 drivers/ptp/ptp_chardev.c:147
 posix_clock_release+0xbc/0x180 kernel/time/posix-clock.c:158
 __fput+0x270/0xbb0 fs/file_table.c:394
 __fput_sync+0x47/0x50 fs/file_table.c:475
 __do_sys_close fs/open.c:1590 [inline]
 __se_sys_close fs/open.c:1575 [inline]
 __x64_sys_close+0x86/0xf0 fs/open.c:1575
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fde0fe7b9da
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24
RSP: 002b:00007ffd2031d3e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fde0fe7b9da
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000032 R08: 0000001b2e460000 R09: 00007fde0ff9bf8c
R10: 00007ffd2031d530 R11: 0000000000000293 R12: 00007fde0fa000a8
R13: ffffffffffffffff R14: 00007fde0fa00000 R15: 0000000000020aa6
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0x11f/0x1b0 lib/list_debug.c:62
Code: 9f e9 8a e8 a3 a3 3a fd 0f 0b 48 89 ca 48 c7 c7 c0 9f e9 8a e8 92 a3 3a fd 0f 0b 48 89 c2 48 c7 c7 20 a0 e9 8a e8 81 a3 3a fd <0f> 0b 48 89 d1 48 c7 c7 a0 a0 e9 8a 48 89 c2 e8 6d a3 3a fd 0f 0b
RSP: 0018:ffffc90004807e00 EFLAGS: 00010082
RAX: 000000000000006d RBX: ffff88807bfb4000 RCX: ffffffff816bb8d9
RDX: 0000000000000000 RSI: ffffffff816c4d42 RDI: 0000000000000005
RBP: ffff88802857b5e0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000001 R11: 0000000000000001 R12: 0000000000000246
R13: ffff88807bfb5048 R14: ffff88807bfb5008 R15: ffff88807bfb5050
FS:  0000555556c77480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fde0ff98000 CR3: 00000000247f4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


Tested on:

commit:         20305791 Add linux-next specific files for 20231020
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
console output: https://syzkaller.appspot.com/x/log.txt?x=11ea5473680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=37404d76b3c8840e
dashboard link: https://syzkaller.appspot.com/bug?extid=df3f3ef31f60781fa911
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=174d13fd680000