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TCP recvmsg seq # bug 2: copied 77AF4B38, seq 77AF4B00, rcvnxt 77AF4B01, fl 40
WARNING: CPU: 0 PID: 5857 at net/ipv4/tcp.c:2650 tcp_recvmsg_locked+0x872/0x3c80 net/ipv4/tcp.c:2648
Modules linked in:
CPU: 0 UID: 0 PID: 5857 Comm: syz-executor316 Not tainted 6.12.0-syzkaller-07749-g28eb75e178d3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:tcp_recvmsg_locked+0x872/0x3c80 net/ipv4/tcp.c:2648
Code: 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 37 01 00 00 8b 0a 48 c7 c7 a0 10 17 8d 44 89 fe 89 da 44 8b 44 24 3c e8 ef 08 39 f7 90 <0f> 0b 90 90 4c 8b 7c 24 48 e9 3d ff ff ff 44 89 e1 80 e1 07 80 c1
RSP: 0018:ffffc90003f17060 EFLAGS: 00010246
RAX: 4137ff8e5474c300 RBX: 0000000077af4b00 RCX: ffff88807e731e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003f17470 R08: ffffffff8155fd62 R09: fffffbfff1cfa898
R10: dffffc0000000000 R11: fffffbfff1cfa898 R12: 1ffff1100fd72793
R13: dffffc0000000000 R14: ffff88807eb93c98 R15: 0000000077af4b38
FS:  0000555588f87380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000cf3d CR3: 0000000078d9c000 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:1891 [inline]
 tcp_zerocopy_receive+0x824/0x25c0 net/ipv4/tcp.c:2123
 do_tcp_getsockopt+0x2491/0x3570 net/ipv4/tcp.c:4583
 tcp_getsockopt+0xfb/0x1c0 net/ipv4/tcp.c:4673
 do_sock_getsockopt+0x3c4/0x7e0 net/socket.c:2374
 __sys_getsockopt net/socket.c:2403 [inline]
 __do_sys_getsockopt net/socket.c:2410 [inline]
 __se_sys_getsockopt net/socket.c:2407 [inline]
 __x64_sys_getsockopt+0x2a1/0x370 net/socket.c:2407
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8aa4a08079
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:00007ffd31706438 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8aa4a08079
RDX: 0000000000000023 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00000000200004c0 R09: 0000000000000006
R10: 0000000020000380 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
 </TASK>