Oops: divide error: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 1 UID: 0 PID: 7106 Comm: syz.2.112 Not tainted 6.12.0-rc6-syzkaller-g80fb25341631 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__tcp_select_window+0x5b4/0x1310 net/ipv4/tcp_output.c:3163 Code: f6 44 01 e3 89 df e8 0b 68 09 f8 44 39 f3 0f 8d 11 ff ff ff e8 7d 66 09 f8 45 89 f4 e9 04 ff ff ff e8 70 66 09 f8 44 89 f0 99 7c 24 14 41 29 d6 45 89 f4 e9 ec fe ff ff e8 58 66 09 f8 48 89 RSP: 0018:ffffc90002f9f930 EFLAGS: 00010293 RAX: 0000000000017e67 RBX: 0000000000017e67 RCX: ffffffff89833d9b RDX: 0000000000000000 RSI: ffffffff89833e00 RDI: 0000000000000004 RBP: 00000000005d6000 R08: 0000000000000004 R09: 0000000000017e67 R10: 0000000000010000 R11: 0000000000000000 R12: 0000000000010000 R13: ffff88805b4b4100 R14: 0000000000017e67 R15: 00000000002eb000 FS: 00007f4c5d1606c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2cc5ffff CR3: 0000000024236000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __tcp_cleanup_rbuf+0x3e7/0x4b0 net/ipv4/tcp.c:1493 mptcp_rcv_space_adjust net/mptcp/protocol.c:2085 [inline] mptcp_recvmsg+0x2156/0x2600 net/mptcp/protocol.c:2289 inet_recvmsg+0x469/0x6a0 net/ipv4/af_inet.c:885 sock_recvmsg_nosec net/socket.c:1051 [inline] sock_recvmsg+0x1b2/0x250 net/socket.c:1073 __sys_recvfrom+0x1a5/0x2e0 net/socket.c:2265 __do_sys_recvfrom net/socket.c:2283 [inline] __se_sys_recvfrom net/socket.c:2279 [inline] __x64_sys_recvfrom+0xe0/0x1c0 net/socket.c:2279 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: 0033:0x7f4c5c37e719 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:00007f4c5d160038 EFLAGS: 00000246 ORIG_RAX: 000000000000002d RAX: ffffffffffffffda RBX: 00007f4c5c535f80 RCX: 00007f4c5c37e719 RDX: 000000800000000e RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f4c5c3f132e R08: 0000000000000000 R09: ffffffff81000000 R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4c5c535f80 R15: 00007ffc27e88c78 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__tcp_select_window+0x5b4/0x1310 net/ipv4/tcp_output.c:3163 Code: f6 44 01 e3 89 df e8 0b 68 09 f8 44 39 f3 0f 8d 11 ff ff ff e8 7d 66 09 f8 45 89 f4 e9 04 ff ff ff e8 70 66 09 f8 44 89 f0 99 7c 24 14 41 29 d6 45 89 f4 e9 ec fe ff ff e8 58 66 09 f8 48 89 RSP: 0018:ffffc90002f9f930 EFLAGS: 00010293 RAX: 0000000000017e67 RBX: 0000000000017e67 RCX: ffffffff89833d9b RDX: 0000000000000000 RSI: ffffffff89833e00 RDI: 0000000000000004 RBP: 00000000005d6000 R08: 0000000000000004 R09: 0000000000017e67 R10: 0000000000010000 R11: 0000000000000000 R12: 0000000000010000 R13: ffff88805b4b4100 R14: 0000000000017e67 R15: 00000000002eb000 FS: 00007f4c5d1606c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2cc5ffff CR3: 0000000024236000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: f6 44 01 e3 89 testb $0x89,-0x1d(%rcx,%rax,1) 5: df e8 fucomip %st(0),%st 7: 0b 68 09 or 0x9(%rax),%ebp a: f8 clc b: 44 39 f3 cmp %r14d,%ebx e: 0f 8d 11 ff ff ff jge 0xffffff25 14: e8 7d 66 09 f8 call 0xf8096696 19: 45 89 f4 mov %r14d,%r12d 1c: e9 04 ff ff ff jmp 0xffffff25 21: e8 70 66 09 f8 call 0xf8096696 26: 44 89 f0 mov %r14d,%eax 29: 99 cltd * 2a: f7 7c 24 14 idivl 0x14(%rsp) <-- trapping instruction 2e: 41 29 d6 sub %edx,%r14d 31: 45 89 f4 mov %r14d,%r12d 34: e9 ec fe ff ff jmp 0xffffff25 39: e8 58 66 09 f8 call 0xf8096696 3e: 48 rex.W 3f: 89 .byte 0x89