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TCP recvmsg seq # bug 2: copied F0F61751, seq F0F61719, rcvnxt F0F6171A, fl 40
WARNING: CPU: 1 PID: 6393 at net/ipv4/tcp.c:2706 tcp_recvmsg_locked+0x80e/0x3660 net/ipv4/tcp.c:2704
Modules linked in:
CPU: 1 UID: 0 PID: 6393 Comm: syz-executor.1 Not tainted 6.15.0-syzkaller-12489-g5d6d67c4cb10 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:tcp_recvmsg_locked+0x80e/0x3660 net/ipv4/tcp.c:2704
Code: 48 c1 e8 03 42 0f b6 04 28 84 c0 4c 8b 74 24 18 0f 85 35 01 00 00 8b 0f 48 c7 c7 a0 c9 9b 8c 44 8b 44 24 3c e8 d3 60 a8 f7 90 <0f> 0b 90 90 e9 40 ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 10
RSP: 0018:ffffc90005517240 EFLAGS: 00010246
RAX: 4e8f9d1ccb3dee00 RBX: 0000000000000000 RCX: ffff88801e3a3c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90005517610 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfaa44 R12: ffff8880780ca370
R13: dffffc0000000000 R14: ffff88802fde00e8 R15: ffff8880780ca398
FS:  00007f05166bf6c0(0000) GS:ffff888125d55000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e3f0970950 CR3: 00000000757b4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 receive_fallback_to_copy net/ipv4/tcp.c:1948 [inline]
 tcp_zerocopy_receive+0x800/0x21d0 net/ipv4/tcp.c:2180
 do_tcp_getsockopt+0x1dd2/0x2610 net/ipv4/tcp.c:4663
 tcp_getsockopt+0x89/0x130 net/ipv4/tcp.c:4762
 do_sock_getsockopt+0x360/0x650 net/socket.c:2357
 __sys_getsockopt net/socket.c:2386 [inline]
 __do_sys_getsockopt net/socket.c:2393 [inline]
 __se_sys_getsockopt net/socket.c:2390 [inline]
 __x64_sys_getsockopt+0x1a5/0x250 net/socket.c:2390
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f051587cae9
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:00007f05166bf0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007f051599bf80 RCX: 00007f051587cae9
RDX: 0000000000000023 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 00007f05158c847a R08: 00000000200004c0 R09: 0000000000000000
R10: 0000000020000380 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f051599bf80 R15: 00007ffc893225c8
 </TASK>