divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 2 PID: 20014 Comm: syz-executor.2 Tainted: G S 5.18.0-rc2-syzkaller-00122-gb9b4c79e5830 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:tcp_cong_avoid_ai net/ipv4/tcp_cong.c:418 [inline] RIP: 0010:tcp_reno_cong_avoid+0x288/0x310 net/ipv4/tcp_cong.c:448 Code: ab 88 09 00 00 e8 28 58 ab f9 45 85 e4 0f 85 aa fe ff ff 5b 5d 41 5c 41 5d 41 5e e9 f2 55 ab f9 e8 ed 55 ab f9 44 89 e0 31 d2 <f7> f5 41 01 c5 89 93 8c 09 00 00 44 89 ab 88 09 00 00 e9 fb fe ff RSP: 0018:ffffc900031ef688 EFLAGS: 00010246 RAX: 0000000000000012 RBX: ffff88801ac1a000 RCX: ffffc90003d83000 RDX: 0000000000000000 RSI: ffffffff87ccfa43 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff87ccf945 R11: 0000000000000000 R12: 0000000000000012 R13: 0000000000000001 R14: 00000000ffffffff R15: ffff88801ac1a988 FS: 00007f4b35de6700(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d022000 CR3: 00000000638d1000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: <TASK> tcp_cdg_cong_avoid+0x5d6/0x1600 net/ipv4/tcp_cdg.c:293 tcp_cong_avoid net/ipv4/tcp_input.c:3133 [inline] tcp_cong_control net/ipv4/tcp_input.c:3490 [inline] tcp_ack+0x3766/0x5900 net/ipv4/tcp_input.c:3891 tcp_rcv_established+0x5e8/0x2020 net/ipv4/tcp_input.c:5959 tcp_v6_do_rcv+0x807/0x13b0 net/ipv6/tcp_ipv6.c:1476 sk_backlog_rcv include/net/sock.h:1051 [inline] __release_sock+0x134/0x3b0 net/core/sock.c:2794 release_sock+0x54/0x1b0 net/core/sock.c:3327 tcp_splice_read+0x5ba/0xaf0 net/ipv4/tcp.c:836 sock_splice_read+0xb6/0x120 net/socket.c:1019 do_splice_to+0x1b9/0x240 fs/splice.c:796 splice_file_to_pipe+0x100/0x120 fs/splice.c:1018 do_splice+0x1549/0x1920 fs/splice.c:1104 __do_splice+0x134/0x250 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x198/0x250 fs/splice.c:1332 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: 0033:0x7f4b34c890e9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4b35de6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f4b34d9c030 RCX: 00007f4b34c890e9 RDX: 0000000000000006 RSI: 0000000000000000 RDI: 000000000000000f RBP: 00007f4b34ce308d R08: 000000000406f408 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdde679eaf R14: 00007f4b35de6300 R15: 0000000000022000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:tcp_cong_avoid_ai net/ipv4/tcp_cong.c:418 [inline] RIP: 0010:tcp_reno_cong_avoid+0x288/0x310 net/ipv4/tcp_cong.c:448 Code: ab 88 09 00 00 e8 28 58 ab f9 45 85 e4 0f 85 aa fe ff ff 5b 5d 41 5c 41 5d 41 5e e9 f2 55 ab f9 e8 ed 55 ab f9 44 89 e0 31 d2 <f7> f5 41 01 c5 89 93 8c 09 00 00 44 89 ab 88 09 00 00 e9 fb fe ff RSP: 0018:ffffc900031ef688 EFLAGS: 00010246 RAX: 0000000000000012 RBX: ffff88801ac1a000 RCX: ffffc90003d83000 RDX: 0000000000000000 RSI: ffffffff87ccfa43 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff87ccf945 R11: 0000000000000000 R12: 0000000000000012 R13: 0000000000000001 R14: 00000000ffffffff R15: ffff88801ac1a988 FS: 00007f4b35de6700(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d022000 CR3: 00000000638d1000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: ab stos %eax,%es:(%rdi) 1: 88 09 mov %cl,(%rcx) 3: 00 00 add %al,(%rax) 5: e8 28 58 ab f9 callq 0xf9ab5832 a: 45 85 e4 test %r12d,%r12d 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 f2 55 ab f9 jmpq 0xf9ab5612 20: e8 ed 55 ab f9 callq 0xf9ab5612 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 8c 09 00 00 mov %edx,0x98c(%rbx) 35: 44 89 ab 88 09 00 00 mov %r13d,0x988(%rbx) 3c: e9 .byte 0xe9 3d: fb sti 3e: fe (bad) 3f: ff .byte 0xff