RBP: 00007efc3b581d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efc3b765038 R14: 00007efc3b764fa0 R15: 00007ffe73ed3b28 watchdog: BUG: soft lockup - CPU#0 stuck for 225s! [syz.0.1348:5090] Modules linked in: CPU: 0 PID: 5090 Comm: syz.0.1348 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:qdisc_lookup+0x18/0x4e0 net/sched/sch_api.c:302 Code: ff ff 4c 89 f7 e8 98 5f ce fd e9 88 fe ff ff 0f 1f 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 50 89 f3 49 89 fe e8 a8 2d 8f fd <31> ff 89 de e8 4f 31 8f fd 85 db 0f 84 dc 00 00 00 49 bd 00 00 00 RSP: 0018:ffffc900009a6e88 EFLAGS: 00000246 RAX: ffffffff83da9b98 RBX: 00000000ffff0000 RCX: 0000000000080000 RDX: ffffc9000175c000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc900009a6eb8 R08: ffff88813fedbb40 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000002 R12: 00000000fffffff1 R13: ffff88812a7968cc R14: ffff8881081da000 R15: ffff88812a796840 FS: 00007efc39f466c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efc3b59e0d1 CR3: 00000001394d2000 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 fq_codel_change+0xa8a/0xf70 net/sched/sch_fq_codel.c:436 fq_codel_init+0x342/0xa20 net/sched/sch_fq_codel.c:473 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:5650 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2511 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5668 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_sendmsg net/socket.c:2518 [inline] __do_sys_sendmsg net/socket.c:2527 [inline] __se_sys_sendmsg net/socket.c:2525 [inline] __x64_sys_sendmsg+0x206/0x2f0 net/socket.c:2525 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 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: 0033:0x7efc3b4ebdd9 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:00007efc39f46028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007efc3b764fa0 RCX: 00007efc3b4ebdd9 RDX: 0000000000008840 RSI: 0000200000000740 RDI: 0000000000000003 RBP: 00007efc3b581d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efc3b765038 R14: 00007efc3b764fa0 R15: 00007ffe73ed3b28 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