divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 5919 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 <f7> 7c 24 2c 41 29 d6 48 bb 00 00 00 00 00 fc ff df e9 9c 00 00 00
RSP: 0018:ffffc90003957b00 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888026d75a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003957bf0 R08: ffff88801e780e93 R09: 1ffff11003cf01d2
R10: dffffc0000000000 R11: ffffed1003cf01d3 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888078a996e8
FS: 000055557ac56500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000180 CR3: 0000000073144000 CR4: 00000000003506e0
Call Trace:
<TASK>
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: 0033:0x7f1872f8f749
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:00007ffc6d7f6508 EFLAGS: 00000246 ORIG_RAX: 0000000000000030
RAX: ffffffffffffffda RBX: 00007f18731e5fa0 RCX: 00007f1872f8f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f1873013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f18731e5fa0 R14: 00007f18731e5fa0 R15: 0000000000000002
</TASK>
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 <f7> 7c 24 2c 41 29 d6 48 bb 00 00 00 00 00 fc ff df e9 9c 00 00 00
RSP: 0018:ffffc90003957b00 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888026d75a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003957bf0 R08: ffff88801e780e93 R09: 1ffff11003cf01d2
R10: dffffc0000000000 R11: ffffed1003cf01d3 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888078a996e8
FS: 000055557ac56500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000180 CR3: 0000000073144000 CR4: 00000000003506e0
----------------
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