linux-kernel - [syzbot ci] Re: tcp: Destroy TCP-AO, TCP-MD5 keys in .sk

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Message-ID: <68a83374.050a0220.3809a8.0004.GAE@google.com>
Date: Fri, 22 Aug 2025 02:08:04 -0700
From: syzbot ci <syzbot+cif1e3ec255ad34895@...kaller.appspotmail.com>
To: 0x7f454c46@...il.com, davem@...emloft.net, devnull@...nel.org, 
	dima@...sta.com, dsahern@...nel.org, edumazet@...gle.com, gilligan@...sta.com, 
	horms@...nel.org, kuba@...nel.org, kuniyu@...gle.com, 
	linux-kernel@...r.kernel.org, ncardwell@...gle.com, netdev@...r.kernel.org, 
	noureddine@...sta.com, pabeni@...hat.com
Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: [syzbot ci] Re: tcp: Destroy TCP-AO, TCP-MD5 keys in .sk_destruct()

syzbot ci has tested the following series

[v1] tcp: Destroy TCP-AO, TCP-MD5 keys in .sk_destruct()
https://lore.kernel.org/all/20250822-b4-tcp-ao-md5-rst-finwait2-v1-0-25825d085dcb@arista.com
* [PATCH net-next 1/2] tcp: Destroy TCP-AO, TCP-MD5 keys in .sk_destruct()
* [PATCH net-next 2/2] tcp: Free TCP-AO/TCP-MD5 info/keys without RCU

and found the following issue:
WARNING in inet_sock_destruct

Full report is available here:
https://ci.syzbot.org/series/4e53fc18-79b4-47d6-87c4-89e499e12879

***

WARNING in inet_sock_destruct

tree:      net-next
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git
base:      a9af709fda7edafa17e072bffe610d9e7ed7a5df
arch:      amd64
compiler:  Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
config:    https://ci.syzbot.org/builds/d6e1c7cd-df1b-4192-bc2d-a2db69987793/config
C repro:   https://ci.syzbot.org/findings/62fd81c8-8c8c-49fe-aa87-8e1418bcc053/c_repro
syz repro: https://ci.syzbot.org/findings/62fd81c8-8c8c-49fe-aa87-8e1418bcc053/syz_repro

------------[ cut here ]------------
WARNING: CPU: 0 PID: 6012 at net/ipv4/af_inet.c:153 inet_sock_destruct+0x5f9/0x730 net/ipv4/af_inet.c:153
Modules linked in:
CPU: 0 UID: 0 PID: 6012 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:inet_sock_destruct+0x5f9/0x730 net/ipv4/af_inet.c:153
Code: 00 41 0f b6 74 24 12 48 c7 c7 20 91 9e 8c 4c 89 e2 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d e9 dd 38 24 f7 e8 68 44 bc f7 90 <0f> 0b 90 e9 62 fe ff ff e8 5a 44 bc f7 90 0f 0b 90 e9 95 fe ff ff
RSP: 0018:ffffc90003a0fc58 EFLAGS: 00010293
RAX: ffffffff8a0366c8 RBX: dffffc0000000000 RCX: ffff888106891cc0
RDX: 0000000000000000 RSI: 00000000000003c0 RDI: 0000000000000000
RBP: 00000000000003c0 R08: ffff88803bb429c3 R09: 1ffff11007768538
R10: dffffc0000000000 R11: ffffed1007768539 R12: ffff88803bb42880
R13: dffffc0000000000 R14: ffff88803bb429c0 R15: 1ffff11007768512
FS:  00005555690ff500(0000) GS:ffff8880b861a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000f65000 CR3: 0000000106d3a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __sk_destruct+0x89/0x660 net/core/sock.c:2339
 inet_release+0x144/0x190 net/ipv4/af_inet.c:435
 __sock_release net/socket.c:649 [inline]
 sock_close+0xc3/0x240 net/socket.c:1439
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa54ab8ebe9
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:00007ffc0978c268 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000000ce2e RCX: 00007fa54ab8ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 000000040978c55f
R10: 0000001b30220000 R11: 0000000000000246 R12: 00007fa54adb5fac
R13: 00007fa54adb5fa0 R14: ffffffffffffffff R15: 0000000000000006
 </TASK>


***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
  Tested-by: syzbot@...kaller.appspotmail.com

---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@...glegroups.com.