[syzbot] [net?] WARNING in __ip6_make_skb (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 2c1713a8f1c9 bpf: constify member bpf_sysctl_kern:: Table
git tree: bpf-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1056ba0c980000
kernel config: https://syzkaller.appspot.com/x/.config?x=17ffd15f654c98ba
dashboard link: https://syzkaller.appspot.com/bug?extid=d7b227731ec589e7f4f0
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=1050742c980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14fd6b1a980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2cad2c60a177/disk-2c1713a8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0c8a5f440db5/vmlinux-2c1713a8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/53bcec8870e5/bzImage-2c1713a8.xz

The issue was bisected to:

commit 1693c5db6ab8262e6f5263f9d211855959aa5acd
Author: Abhishek Chauhan <quic_a...@quicinc.com>
Date: Thu May 9 21:18:33 2024 +0000

net: Add additional bit to support clockid_t timestamp type

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14eeacb2980000
final oops: https://syzkaller.appspot.com/x/report.txt?x=16eeacb2980000
console output: https://syzkaller.appspot.com/x/log.txt?x=12eeacb2980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d7b227...@syzkaller.appspotmail.com
Fixes: 1693c5db6ab8 ("net: Add additional bit to support clockid_t timestamp type")

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5089 at include/linux/skbuff.h:4226 skb_set_delivery_type_by_clockid include/linux/skbuff.h:4226 [inline]
WARNING: CPU: 1 PID: 5089 at include/linux/skbuff.h:4226 __ip6_make_skb+0x14f8/0x2470 net/ipv6/ip6_output.c:1930
Modules linked in:
CPU: 1 PID: 5089 Comm: syz-executor227 Not tainted 6.9.0-syzkaller-08561-g2c1713a8f1c9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:skb_set_delivery_type_by_clockid include/linux/skbuff.h:4226 [inline]
RIP: 0010:__ip6_make_skb+0x14f8/0x2470 net/ipv6/ip6_output.c:1930
Code: c0 0f 85 94 0a 00 00 41 8b 5d 00 4d 85 f6 74 0d e8 dd 50 6e f7 83 e3 fc 44 09 e3 eb 79 e8 d0 50 6e f7 eb 6f e8 c9 50 6e f7 90 <0f> 0b 90 48 8b 5c 24 08 48 8d 7b 20 48 89 f8 48 c1 e8 03 42 80 3c
RSP: 0018:ffffc9000345f400 EFLAGS: 00010293
RAX: ffffffff8a27e107 RBX: 00000000000000ff RCX: ffff888025a99e00
RDX: 0000000000000000 RSI: ffffffff8f6e8f20 RDI: 00000000000000ff
RBP: ffffc9000345f610 R08: 0000000000000001 R09: ffffffff8a27e049
R10: 0000000000000003 R11: ffff888025a99e00 R12: ffff88807ab76730
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc9000345f6a0
FS: 000055556e2a2380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000045ad50 CR3: 000000007e9e2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
ip6_make_skb+0x48b/0x530 net/ipv6/ip6_output.c:2046
udpv6_sendmsg+0x237f/0x3270 net/ipv6/udp.c:1584
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0xef/0x270 net/socket.c:745
____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
___sys_sendmsg net/socket.c:2638 [inline]
__sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe6cfe18ab9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 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:00007ffe2f15e328 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe6cfe18ab9
RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000003
RBP: 00007fe6cfe8b5f0 R08: 0000000000000006 R09: 0000000000000006
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000001
R13: 431bde82d7b634db 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 syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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