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

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 8470e4368b0f Merge branch 'net-cacheline-optimizations'
git tree: net-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=12094286e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=f8715b6ede5c4b90
dashboard link: https://syzkaller.appspot.com/bug?extid=06dbd397158ec0ea4983
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1247bee2e80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1285243ce80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/90007d08e178/disk-8470e436.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b55270de1cdc/vmlinux-8470e436.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2237d34b6fec/bzImage-8470e436.xz

The issue was bisected to:

commit 965b57b469a589d64d81b1688b38dcb537011bb0
Author: Cong Wang <cong...@bytedance.com>
Date: Wed Jun 15 16:20:12 2022 +0000

net: Introduce a new proto_ops ->read_skb()

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1087c0d4e80000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1287c0d4e80000
console output: https://syzkaller.appspot.com/x/log.txt?x=1487c0d4e80000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+06dbd3...@syzkaller.appspotmail.com
Fixes: 965b57b469a5 ("net: Introduce a new proto_ops ->read_skb()")

WARNING: CPU: 1 PID: 5130 at net/ipv4/tcp.c:2396 tcp_recvmsg_locked+0xa54/0x2490 net/ipv4/tcp.c:2396
Modules linked in:
CPU: 1 PID: 5130 Comm: syz-executor313 Not tainted 6.7.0-rc3-syzkaller-00690-g8470e4368b0f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:tcp_recvmsg_locked+0xa54/0x2490 net/ipv4/tcp.c:2396
Code: 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 70 18 00 00 48 8b 04 24 89 da 48 c7 c7 a0 b0 f4 8b 44 8b 44 24 30 8b 30 e8 ad 69 57 f8 90 <0f> 0b 90 90 e9 62 fa ff ff e8 7e 4b 91 f8 49 8d 5f 60 be 08 00 00
RSP: 0018:ffffc90003acf290 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 000000000618aefc RCX: ffffffff814db209
RDX: ffff8880259e9dc0 RSI: ffffffff814db216 RDI: 0000000000000001
RBP: ffff8880250b7024 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000004 R12: dffffc0000000000
R13: ffff8880250b6ff0 R14: 0000000000000001 R15: ffff8880250b7018
FS: 0000555556ebf380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff3dd9f6f8 CR3: 000000002534d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
receive_fallback_to_copy+0x1d5/0x7a0 net/ipv4/tcp.c:1866
tcp_zerocopy_receive+0x110b/0x2110 net/ipv4/tcp.c:2099
do_tcp_getsockopt+0x1ae0/0x27b0 net/ipv4/tcp.c:4257
tcp_getsockopt net/ipv4/tcp.c:4342 [inline]
tcp_getsockopt+0xd1/0xf0 net/ipv4/tcp.c:4333
do_sock_getsockopt+0x2e1/0x6c0 net/socket.c:2373
__sys_getsockopt+0x1a3/0x270 net/socket.c:2402
__do_sys_getsockopt net/socket.c:2412 [inline]
__se_sys_getsockopt net/socket.c:2409 [inline]
__x64_sys_getsockopt+0xbd/0x150 net/socket.c:2409
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fcd44438c59
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 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:00007fff3dd9f7f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fcd44438c59
RDX: 0000000000000023 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00000000200004c0 R09: 0000000100000000
R10: 0000000020000380 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>


---
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[John Fastabend]

I'll take a look. Thanks.