RBP: 00007f745e127d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f745e30afac R14: 00007f745e30afa0 R15: 00007f745e30afa0 watchdog: BUG: soft lockup - CPU#0 stuck for 226s! [syz.2.17:373] Modules linked in: CPU: 0 PID: 373 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:qdisc_lookup+0x427/0x4e0 net/sched/sch_api.c:314 Code: 80 e1 07 80 c1 03 38 c1 7c b2 4c 89 ff e8 81 29 ce fd eb a8 e8 9a ab 8e fd eb 08 e8 93 ab 8e fd 45 31 f6 4c 89 f0 48 83 c4 08 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 44 89 e1 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc90000f86db0 EFLAGS: 00000292 RAX: ffff8881228afc00 RBX: 00000000ffff0000 RCX: ffff8881110593c0 RDX: 0000000000000000 RSI: 00000000ffff0000 RDI: 00000000ffff0000 RBP: ffffc90000f86dd8 R08: ffff8881110593c0 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000000 R12: ffff888111210000 R13: dffffc0000000000 R14: ffff8881228afc00 R15: 00000000ffff0000 FS: 0000555588f3d500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000120524000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: qdisc_tree_reduce_backlog+0x111/0x340 net/sched/sch_api.c:784 codel_change+0x8e6/0xc20 net/sched/sch_codel.c:180 codel_init+0x1a8/0x390 net/sched/sch_codel.c:199 qdisc_create+0x803/0x11b0 net/sched/sch_api.c:1256 tc_modify_qdisc+0x8ad/0x1570 net/sched/sch_api.c:-1 rtnetlink_rcv_msg+0xa4b/0xce0 net/core/rtnetlink.c:5653 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2511 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5671 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x879/0xb80 net/netlink/af_netlink.c:1922 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2435 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2489 __sys_sendmmsg+0x2ba/0x4e0 net/socket.c:2575 __do_sys_sendmmsg net/socket.c:2604 [inline] __se_sys_sendmmsg net/socket.c:2601 [inline] __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2601 x64_sys_call+0x6c6/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f745e091e59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeb743ca98 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f745e30afa0 RCX: 00007f745e091e59 RDX: 040000000000009f RSI: 00002000000002c0 RDI: 0000000000000005 RBP: 00007f745e127d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f745e30afac R14: 00007f745e30afa0 R15: 00007f745e30afa0 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 1 skipped: idling at default_idle+0xf/0x20 arch/x86/kernel/process.c:729