RBP: 00007f62c2a6fd69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f62c2c53038 R14: 00007f62c2c52fa0 R15: 00007ffdf41f7a88 watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.5.1439:5814] Modules linked in: CPU: 0 PID: 5814 Comm: syz.5.1439 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:qdisc_match_from_root net/sched/sch_api.c:270 [inline] RIP: 0010:qdisc_lookup+0x1a0/0x4e0 net/sched/sch_api.c:304 Code: 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 14 9e ec fd 4d 8b 36 4d 85 f6 0f 94 c0 49 83 c6 d8 0f 94 c1 08 c1 74 0a 9b 1b b2 fd e9 83 00 00 00 4d 8d 66 38 4c 89 e0 48 c1 e8 03 42 RSP: 0018:ffffc90001456f08 EFLAGS: 00000202 RAX: 1ffff11024cf0801 RBX: 00000000ffff0000 RCX: 0000000000080001 RDX: ffffc90009d8a000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc90001456f38 R08: ffff88811afc8000 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000002 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffffffffffd8 R15: ffff888126784000 FS: 00007f62c14346c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001200 CR3: 0000000111b91000 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:783 codel_change+0x8fc/0xbe0 net/sched/sch_codel.c:180 codel_init+0x1a8/0x390 net/sched/sch_codel.c:199 qdisc_create+0x848/0x1220 net/sched/sch_api.c:1255 tc_modify_qdisc+0x8a1/0x1490 net/sched/sch_api.c:-1 rtnetlink_rcv_msg+0xa31/0xcc0 net/core/rtnetlink.c:5613 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5631 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x89c/0xb50 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2376 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2430 __sys_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg net/socket.c:2466 [inline] __x64_sys_sendmsg+0x1f9/0x2c0 net/socket.c:2466 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f62c29d9dd9 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:00007f62c1434028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f62c2c52fa0 RCX: 00007f62c29d9dd9 RDX: 0000000000000000 RSI: 0000200000001200 RDI: 0000000000000006 RBP: 00007f62c2a6fd69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f62c2c53038 R14: 00007f62c2c52fa0 R15: 00007ffdf41f7a88 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:60 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 1 skipped: idling at default_idle+0x12/0x20 arch/x86/kernel/process.c:717