BUG: "hc->tx_t_ipi == 0" holds (exception!) at net/dccp/ccids/ccid3.c:90/ccid3_update_send_interval() CPU: 0 PID: 5756 Comm: syz-executor.5 Not tainted 6.6.0-syzkaller-13878-g2c40c1c6adab #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106 ccid3_update_send_interval net/dccp/ccids/ccid3.c:90 [inline] ccid3_update_send_interval+0x18d/0x1c0 net/dccp/ccids/ccid3.c:86 ccid3_hc_tx_update_s net/dccp/ccids/ccid3.c:169 [inline] ccid3_hc_tx_packet_sent+0x134/0x190 net/dccp/ccids/ccid3.c:353 ccid_hc_tx_packet_sent net/dccp/ccid.h:175 [inline] dccp_xmit_packet+0x27b/0x710 net/dccp/output.c:289 dccp_write_xmit+0x16c/0x1d0 net/dccp/output.c:366 dccp_sendmsg+0x968/0xcc0 net/dccp/proto.c:801 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:847 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 ____sys_sendmsg+0x2ac/0x940 net/socket.c:2588 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2642 __sys_sendmmsg+0x1a1/0x450 net/socket.c:2728 __do_sys_sendmmsg net/socket.c:2757 [inline] __se_sys_sendmmsg net/socket.c:2754 [inline] __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2754 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f61984798a9 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f61995330c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f619858bf60 RCX: 00007f61984798a9 RDX: 0000000000000001 RSI: 0000000020005700 RDI: 0000000000000004 RBP: 00007f61984d5074 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f619858bf60 R15: 00007ffcf5305158