------------[ cut here ]------------
TCP recvmsg seq # bug 2: copied F63F3A9C, seq F615434E, rcvnxt F62C3D0B, fl 40
WARNING: CPU: 1 PID: 5826 at net/ipv4/tcp.c:2418 tcp_recvmsg_locked+0xaeb/0x2700 net/ipv4/tcp.c:2418
Modules linked in:
CPU: 1 UID: 0 PID: 5826 Comm: syz-executor Not tainted 6.11.0-rc7-syzkaller-gd42f7708e27c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:tcp_recvmsg_locked+0xaeb/0x2700 net/ipv4/tcp.c:2418
Code: 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ab 18 00 00 48 8b 04 24 89 da 48 c7 c7 20 cb 86 8c 44 8b 44 24 34 8b 30 e8 b6 f9 cf f7 90 <0f> 0b 90 90 e9 02 fa ff ff e8 77 ae 0d f8 49 8d 5c 24 60 be 08 00
RSP: 0018:ffffc90004ac7408 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 00000000f615434e RCX: ffffffff814e1d09
RDX: ffff88802e94a440 RSI: ffffffff814e1d16 RDI: 0000000000000001
RBP: ffff88802b3e07b4 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802b3e07a8
R13: ffff88802b3e0780 R14: 000000000000ffcb R15: dffffc0000000000
FS:  00007fc4b6e696c0(0000) GS:ffff88806a700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002038f000 CR3: 000000003111c000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 receive_fallback_to_copy net/ipv4/tcp.c:1887 [inline]
 tcp_zerocopy_receive+0x13b5/0x2520 net/ipv4/tcp.c:2119
 do_tcp_getsockopt+0x1803/0x2970 net/ipv4/tcp.c:4321
 tcp_getsockopt net/ipv4/tcp.c:4411 [inline]
 tcp_getsockopt+0xdf/0x100 net/ipv4/tcp.c:4402
 do_sock_getsockopt+0x3fe/0x800 net/socket.c:2386
 __sys_getsockopt+0x1a1/0x270 net/socket.c:2415
 __do_sys_getsockopt net/socket.c:2425 [inline]
 __se_sys_getsockopt net/socket.c:2422 [inline]
 __x64_sys_getsockopt+0xbd/0x160 net/socket.c:2422
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc4b607cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc4b6e690c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007fc4b61ac050 RCX: 00007fc4b607cee9
RDX: 0000000000000023 RSI: 0000000000000006 RDI: 0000000000000005
RBP: 00007fc4b60c949e R08: 0000000020000380 R09: 0000000000000000
R10: 0000000020000340 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fc4b61ac050 R15: 00007ffefde373f8
 </TASK>