linux-kernel - Re: [syzbot] [net?] kernel BUG in set

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Message-ID: <68f5a973.a70a0220.205af.0024.GAE@google.com>
Date: Sun, 19 Oct 2025 20:16:03 -0700
From: syzbot <syzbot+be97dd4da14ae88b6ba4@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, ssrane_b23@...vjti.ac.in, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] kernel BUG in set_ipsecrequest

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in set_ipsecrequest

skbuff: skb_over_panic: text:ffffffff8a205d63 len:392 put:16 head:ffff88805b276a40 data:ffff88805b276a40 tail:0x188 end:0x180 dev:<NULL>
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:212!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 6444 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:212
Code: c7 60 0e 6e 8c 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 55 41 57 41 56 e8 4e 50 f5 ff 48 83 c4 20 90 <0f> 0b cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003c06b68 EFLAGS: 00010282
RAX: 0000000000000088 RBX: dffffc0000000000 RCX: 05b0c7e83ffe1100
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000180 R08: ffffc90003c06867 R09: 1ffff92000780d0c
R10: dffffc0000000000 R11: fffff52000780d0d R12: ffff888078c92150
R13: ffff88805b276a40 R14: ffff88805b276a40 R15: 0000000000000188
FS:  00007f2bce8166c0(0000) GS:ffff888125d0b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f90ed0682d0 CR3: 0000000069384000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 skb_over_panic net/core/skbuff.c:217 [inline]
 skb_put+0x159/0x210 net/core/skbuff.c:2583
 skb_put_zero include/linux/skbuff.h:2788 [inline]
 set_ipsecrequest+0x73/0x680 net/key/af_key.c:3532
 pfkey_send_migrate+0x11f2/0x1de0 net/key/af_key.c:3636
 km_migrate+0x155/0x260 net/xfrm/xfrm_state.c:2838
 xfrm_migrate+0x2020/0x2330 net/xfrm/xfrm_policy.c:4698
 xfrm_do_migrate+0x796/0x900 net/xfrm/xfrm_user.c:3144
 xfrm_user_rcv_msg+0x7a3/0xab0 net/xfrm/xfrm_user.c:3501
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552
 xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3523
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 ____sys_sendmsg+0x505/0x830 net/socket.c:2630
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684
 __sys_sendmsg net/socket.c:2716 [inline]
 __do_sys_sendmsg net/socket.c:2721 [inline]
 __se_sys_sendmsg net/socket.c:2719 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2719
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2bcd98eec9
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:00007f2bce816038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f2bcdbe5fa0 RCX: 00007f2bcd98eec9
RDX: 0000000000000000 RSI: 0000200000000380 RDI: 0000000000000004
RBP: 00007f2bcda11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2bcdbe6038 R14: 00007f2bcdbe5fa0 R15: 00007ffd8b27cbc8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_panic+0x157/0x160 net/core/skbuff.c:212
Code: c7 60 0e 6e 8c 48 8b 74 24 08 48 8b 54 24 10 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 55 41 57 41 56 e8 4e 50 f5 ff 48 83 c4 20 90 <0f> 0b cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003c06b68 EFLAGS: 00010282
RAX: 0000000000000088 RBX: dffffc0000000000 RCX: 05b0c7e83ffe1100
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000180 R08: ffffc90003c06867 R09: 1ffff92000780d0c
R10: dffffc0000000000 R11: fffff52000780d0d R12: ffff888078c92150
R13: ffff88805b276a40 R14: ffff88805b276a40 R15: 0000000000000188
FS:  00007f2bce8166c0(0000) GS:ffff888125e0b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001f40 CR3: 0000000069384000 CR4: 00000000003526f0


Tested on:

commit:         7361c864 selftests/bpf: Fix list_del() in arena list
git tree:       bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12e10e7c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9ad7b090a18654a7
dashboard link: https://syzkaller.appspot.com/bug?extid=be97dd4da14ae88b6ba4
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Note: no patches were applied.