divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8677 Comm: syz-executor073 Not tainted 5.14.0-rc3-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 40 09 00 00 e8 48 2f d1 f9 45 85 e4 0f 85 aa fe ff ff 5b 5d 41 5c 41 5d 41 5e e9 f2 27 d1 f9 e8 ed 27 d1 f9 44 89 e0 31 d2 f5 41 01 c5 89 93 44 09 00 00 44 89 ab 40 09 00 00 e9 fb fe ff RSP: 0018:ffffc90001c4f698 EFLAGS: 00010246 RAX: 0000000000000011 RBX: ffff88801c320bc0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff87a47373 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff87a47275 R11: 0000000000000000 R12: 0000000000000011 R13: 0000000000000001 R14: 00000000ffffffff R15: ffff88801c321500 FS: 0000000001060300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020200000 CR3: 0000000033f16000 CR4: 00000000001506e0 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:3091 [inline] tcp_cong_control net/ipv4/tcp_input.c:3449 [inline] tcp_ack+0x37c7/0x59e0 net/ipv4/tcp_input.c:3850 tcp_rcv_established+0x5d7/0x2130 net/ipv4/tcp_input.c:5887 tcp_v4_do_rcv+0x5d4/0x880 net/ipv4/tcp_ipv4.c:1694 sk_backlog_rcv include/net/sock.h:1023 [inline] __release_sock+0x134/0x3b0 net/core/sock.c:2655 __sk_flush_backlog+0x22/0x30 net/core/sock.c:2675 sk_flush_backlog include/net/sock.h:1110 [inline] tcp_sendmsg_locked+0x2817/0x2f10 net/ipv4/tcp.c:1305 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1461 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 __sys_sendto+0x21c/0x320 net/socket.c:2019 __do_sys_sendto net/socket.c:2031 [inline] __se_sys_sendto net/socket.c:2027 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2027 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4438a9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd7acf6b18 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004438a9 RDX: 00000000fffffd46 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000001f4 R10: 00000000000081f4 R11: 0000000000000246 R12: 00007ffd7acf6b40 R13: 00000000000f4240 R14: 0000000000011ffa R15: 00007ffd7acf6b34 Modules linked in: ---[ end trace 33959e02e1d576f2 ]--- 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 40 09 00 00 e8 48 2f d1 f9 45 85 e4 0f 85 aa fe ff ff 5b 5d 41 5c 41 5d 41 5e e9 f2 27 d1 f9 e8 ed 27 d1 f9 44 89 e0 31 d2 f5 41 01 c5 89 93 44 09 00 00 44 89 ab 40 09 00 00 e9 fb fe ff RSP: 0018:ffffc90001c4f698 EFLAGS: 00010246 RAX: 0000000000000011 RBX: ffff88801c320bc0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff87a47373 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff87a47275 R11: 0000000000000000 R12: 0000000000000011 R13: 0000000000000001 R14: 00000000ffffffff R15: ffff88801c321500 FS: 0000000001060300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020200000 CR3: 0000000033f16000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400