divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 20767 Comm: syz-executor.5 Not tainted 5.16.0-rc1-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 80 09 00 00 e8 b8 3b b3 f9 45 85 e4 0f 85 aa fe ff ff 5b 5d 41 5c 41 5d 41 5e e9 82 39 b3 f9 e8 7d 39 b3 f9 44 89 e0 31 d2 f5 41 01 c5 89 93 84 09 00 00 44 89 ab 80 09 00 00 e9 fb fe ff RSP: 0018:ffffc90002fbf698 EFLAGS: 00010246 RAX: 0000000000000011 RBX: ffff88801dcc9800 RCX: ffffc900144d0000 RDX: 0000000000000000 RSI: ffffffff87c4ae63 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff87c4ad65 R11: 0000000000000000 R12: 0000000000000011 R13: 0000000000000001 R14: 00000000ffffffff R15: ffff88801dcca180 FS: 00007fcd59e04700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33825000 CR3: 00000000393b8000 CR4: 00000000003526e0 Call Trace: tcp_cdg_cong_avoid+0x5d6/0x1600 net/ipv4/tcp_cdg.c:293 tcp_cong_avoid net/ipv4/tcp_input.c:3131 [inline] tcp_cong_control net/ipv4/tcp_input.c:3488 [inline] tcp_ack+0x37d2/0x5920 net/ipv4/tcp_input.c:3889 tcp_rcv_established+0x5d7/0x2130 net/ipv4/tcp_input.c:5936 tcp_v4_do_rcv+0x600/0x8d0 net/ipv4/tcp_ipv4.c:1716 sk_backlog_rcv include/net/sock.h:1030 [inline] __release_sock+0x134/0x3b0 net/core/sock.c:2768 __sk_flush_backlog+0x22/0x30 net/core/sock.c:2788 sk_flush_backlog include/net/sock.h:1117 [inline] tcp_sendmsg_locked+0x2989/0x3040 net/ipv4/tcp.c:1277 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1440 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 __sys_sendto+0x21c/0x320 net/socket.c:2036 __do_sys_sendto net/socket.c:2048 [inline] __se_sys_sendto net/socket.c:2044 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2044 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: 0033:0x7fcd5c88eae9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcd59e04188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fcd5c9a1f60 RCX: 00007fcd5c88eae9 RDX: 00000000fffffd46 RSI: 0000000020000240 RDI: 0000000000000003 RBP: 00007fcd5c8e8f6d R08: 0000000000000000 R09: 00000000000001f4 R10: 00000000000081f4 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcd5ced5b2f R14: 00007fcd59e04300 R15: 0000000000022000 Modules linked in: ---[ end trace 0d5170cc0abf4b11 ]--- 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 80 09 00 00 e8 b8 3b b3 f9 45 85 e4 0f 85 aa fe ff ff 5b 5d 41 5c 41 5d 41 5e e9 82 39 b3 f9 e8 7d 39 b3 f9 44 89 e0 31 d2 f5 41 01 c5 89 93 84 09 00 00 44 89 ab 80 09 00 00 e9 fb fe ff RSP: 0018:ffffc90002fbf698 EFLAGS: 00010246 RAX: 0000000000000011 RBX: ffff88801dcc9800 RCX: ffffc900144d0000 RDX: 0000000000000000 RSI: ffffffff87c4ae63 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff87c4ad65 R11: 0000000000000000 R12: 0000000000000011 R13: 0000000000000001 R14: 00000000ffffffff R15: ffff88801dcca180 FS: 00007fcd59e04700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9a5e4b8000 CR3: 00000000393b8000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: ab stos %eax,%es:(%rdi) 1: 80 09 00 orb $0x0,(%rcx) 4: 00 e8 add %ch,%al 6: b8 3b b3 f9 45 mov $0x45f9b33b,%eax b: 85 e4 test %esp,%esp d: 0f 85 aa fe ff ff jne 0xfffffebd 13: 5b pop %rbx 14: 5d pop %rbp 15: 41 5c pop %r12 17: 41 5d pop %r13 19: 41 5e pop %r14 1b: e9 82 39 b3 f9 jmpq 0xf9b339a2 20: e8 7d 39 b3 f9 callq 0xf9b339a2 25: 44 89 e0 mov %r12d,%eax 28: 31 d2 xor %edx,%edx * 2a: f7 f5 div %ebp <-- trapping instruction 2c: 41 01 c5 add %eax,%r13d 2f: 89 93 84 09 00 00 mov %edx,0x984(%rbx) 35: 44 89 ab 80 09 00 00 mov %r13d,0x980(%rbx) 3c: e9 .byte 0xe9 3d: fb sti 3e: fe (bad) 3f: ff .byte 0xff