divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 13458 Comm: syz-executor.5 Not tainted 5.13.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:tcp_cong_avoid_ai net/ipv4/tcp_cong.c:420 [inline] RIP: 0010:tcp_reno_cong_avoid+0x288/0x310 net/ipv4/tcp_cong.c:450 Code: ab 38 09 00 00 e8 08 70 df f9 45 85 e4 0f 85 aa fe ff ff 5b 5d 41 5c 41 5d 41 5e e9 42 68 df f9 e8 3d 68 df f9 44 89 e0 31 d2 <f7> f5 41 01 c5 89 93 3c 09 00 00 44 89 ab 38 09 00 00 e9 fb fe ff RSP: 0018:ffffc90016eef678 EFLAGS: 00010246 RAX: 0000000000000005 RBX: ffff88802c9ede00 RCX: ffffc9001411b000 RDX: 0000000000000000 RSI: ffffffff87956b23 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff87956a25 R11: 0000000000000000 R12: 0000000000000005 R13: 0000000000000001 R14: 00000000ffffffff R15: ffff88802c9ee738 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0063) knlGS:00000000f54e7b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000000810e9a2 CR3: 000000006ed0e000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tcp_cdg_cong_avoid+0x5d6/0x1600 net/ipv4/tcp_cdg.c:293 tcp_cong_avoid net/ipv4/tcp_input.c:3084 [inline] tcp_cong_control net/ipv4/tcp_input.c:3442 [inline] tcp_ack+0x3764/0x5970 net/ipv4/tcp_input.c:3843 tcp_rcv_established+0x56b/0x1eb0 net/ipv4/tcp_input.c:5872 tcp_v4_do_rcv+0x5d1/0x870 net/ipv4/tcp_ipv4.c:1694 sk_backlog_rcv include/net/sock.h:1020 [inline] __release_sock+0x134/0x3b0 net/core/sock.c:2550 __sk_flush_backlog+0x22/0x30 net/core/sock.c:2570 sk_flush_backlog include/net/sock.h:1107 [inline] tcp_sendmsg_locked+0x27e6/0x2e40 net/ipv4/tcp.c:1305 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1458 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 __sys_sendto+0x21c/0x320 net/socket.c:1977 __do_sys_sendto net/socket.c:1989 [inline] __se_sys_sendto net/socket.c:1985 [inline] __ia32_sys_sendto+0xdb/0x1b0 net/socket.c:1985 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x67/0xe0 arch/x86/entry/common.c:143 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:168 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f0e549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f54e75fc EFLAGS: 00000296 ORIG_RAX: 0000000000000171 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000240 RDX: 00000000fffffd46 RSI: 00000000000081f4 RDI: 0000000000000000 RBP: 00000000000001f4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 3aa91dcd28f06633 ]--- RIP: 0010:tcp_cong_avoid_ai net/ipv4/tcp_cong.c:420 [inline] RIP: 0010:tcp_reno_cong_avoid+0x288/0x310 net/ipv4/tcp_cong.c:450 Code: ab 38 09 00 00 e8 08 70 df f9 45 85 e4 0f 85 aa fe ff ff 5b 5d 41 5c 41 5d 41 5e e9 42 68 df f9 e8 3d 68 df f9 44 89 e0 31 d2 <f7> f5 41 01 c5 89 93 3c 09 00 00 44 89 ab 38 09 00 00 e9 fb fe ff RSP: 0018:ffffc90016eef678 EFLAGS: 00010246 RAX: 0000000000000005 RBX: ffff88802c9ede00 RCX: ffffc9001411b000 RDX: 0000000000000000 RSI: ffffffff87956b23 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff87956a25 R11: 0000000000000000 R12: 0000000000000005 R13: 0000000000000001 R14: 00000000ffffffff R15: ffff88802c9ee738 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0063) knlGS:00000000f54e7b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007fad9be85000 CR3: 000000006ed0e000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400