divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5923 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__tcp_select_window+0x7a3/0x1270 net/ipv4/tcp_output.c:3114 Code: ff ff ff 44 89 e1 d3 e0 89 c1 f7 d1 41 01 ce 41 21 c6 e9 c5 00 00 00 e8 ab 9e 97 f8 e9 b8 00 00 00 e8 a1 9e 97 f8 44 89 f0 99 7c 24 2c 41 29 d6 48 bb 00 00 00 00 00 fc ff df e9 9c 00 00 00 RSP: 0018:ffffc900032f7b00 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888079f2da00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900032f7bf0 R08: ffff88807ade0e93 R09: 1ffff1100f5bc1d2 R10: dffffc0000000000 R11: ffffed100f5bc1d3 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88802148cae8 FS: 0000555576e05500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000180 CR3: 0000000076c6f000 CR4: 00000000003506e0 Call Trace: tcp_select_window net/ipv4/tcp_output.c:276 [inline] __tcp_transmit_skb+0xb40/0x32a0 net/ipv4/tcp_output.c:1368 tcp_transmit_skb net/ipv4/tcp_output.c:1440 [inline] tcp_send_active_reset+0x35e/0x6c0 net/ipv4/tcp_output.c:3593 mptcp_do_fastclose+0x23a/0x310 net/mptcp/protocol.c:2820 mptcp_disconnect+0x1fc/0x520 net/mptcp/protocol.c:3282 inet_shutdown+0x1be/0x370 net/ipv4/af_inet.c:934 __sys_shutdown_sock net/socket.c:2436 [inline] __sys_shutdown net/socket.c:2448 [inline] __do_sys_shutdown net/socket.c:2456 [inline] __se_sys_shutdown net/socket.c:2454 [inline] __x64_sys_shutdown+0x174/0x1d0 net/socket.c:2454 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f1d5a98f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc342f3648 EFLAGS: 00000246 ORIG_RAX: 0000000000000030 RAX: ffffffffffffffda RBX: 00007f1d5abe5fa0 RCX: 00007f1d5a98f749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f1d5aa13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1d5abe5fa0 R14: 00007f1d5abe5fa0 R15: 0000000000000002 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__tcp_select_window+0x7a3/0x1270 net/ipv4/tcp_output.c:3114 Code: ff ff ff 44 89 e1 d3 e0 89 c1 f7 d1 41 01 ce 41 21 c6 e9 c5 00 00 00 e8 ab 9e 97 f8 e9 b8 00 00 00 e8 a1 9e 97 f8 44 89 f0 99 7c 24 2c 41 29 d6 48 bb 00 00 00 00 00 fc ff df e9 9c 00 00 00 RSP: 0018:ffffc900032f7b00 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888079f2da00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900032f7bf0 R08: ffff88807ade0e93 R09: 1ffff1100f5bc1d2 R10: dffffc0000000000 R11: ffffed100f5bc1d3 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88802148cae8 FS: 0000555576e05500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555576e05808 CR3: 0000000076c6f000 CR4: 00000000003506f0 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: ff 44 89 e1 incl -0x1f(%rcx,%rcx,4) 4: d3 e0 shl %cl,%eax 6: 89 c1 mov %eax,%ecx 8: f7 d1 not %ecx a: 41 01 ce add %ecx,%r14d d: 41 21 c6 and %eax,%r14d 10: e9 c5 00 00 00 jmp 0xda 15: e8 ab 9e 97 f8 call 0xf8979ec5 1a: e9 b8 00 00 00 jmp 0xd7 1f: e8 a1 9e 97 f8 call 0xf8979ec5 24: 44 89 f0 mov %r14d,%eax 27: 99 cltd * 28: f7 7c 24 2c idivl 0x2c(%rsp) <-- trapping instruction 2c: 41 29 d6 sub %edx,%r14d 2f: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx 36: fc ff df 39: e9 9c 00 00 00 jmp 0xda