RBP: 00007f7709fa2b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f770a191038 R14: 00007f770a190fa0 R15: 00007ffc67f42dd8 watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.4.932:4284] Modules linked in: CPU: 0 PID: 4284 Comm: syz.4.932 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 RIP: 0010:dev_ingress_queue include/linux/rtnetlink.h:85 [inline] RIP: 0010:qdisc_lookup+0x23b/0x4d0 net/sched/sch_api.c:308 Code: b2 fd e9 f9 01 00 00 e8 43 18 b2 fd eb 05 e8 3c 18 b2 fd 4c 8b 75 d0 49 81 c6 40 03 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 f7 e8 fb a5 ec fd 4d 8b 36 4d 85 f6 0f 84 ba 00 00 00 RSP: 0018:ffffc9000104f028 EFLAGS: 00000246 RAX: 1ffff11024d2d468 RBX: 00000000ffff0000 RCX: 0000000000080000 RDX: ffffc90003503000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc9000104f058 R08: 0000000000000004 R09: 000000000000000d R10: 0000000000000007 R11: 0000000000000040 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88812696a340 R15: ffff88812696a000 FS: 00007f77089626c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c31260e CR3: 00000001273ea000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: qdisc_tree_reduce_backlog+0x10b/0x380 net/sched/sch_api.c:800 sfq_change net/sched/sch_sfq.c:742 [inline] sfq_init+0x17db/0x2150 net/sched/sch_sfq.c:807 qdisc_create+0x84c/0x1220 net/sched/sch_api.c:1272 tc_modify_qdisc+0x8c2/0x1470 net/sched/sch_api.c:-1 rtnetlink_rcv_msg+0x9e9/0xca0 net/core/rtnetlink.c:5622 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2508 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5640 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x86c/0xa30 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x949/0xb70 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2377 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2431 __sys_sendmsg net/socket.c:2460 [inline] __do_sys_sendmsg net/socket.c:2469 [inline] __se_sys_sendmsg net/socket.c:2467 [inline] __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2467 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f7709f0ab19 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:00007f7708962028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f770a190fa0 RCX: 00007f7709f0ab19 RDX: 0000000000000080 RSI: 00002000000000c0 RDI: 0000000000000004 RBP: 00007f7709fa2b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f770a191038 R14: 00007f770a190fa0 R15: 00007ffc67f42dd8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2443 Comm: kworker/u4:5 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:229 [inline] RIP: 0010:smp_call_function_single+0x209/0x490 kernel/smp.c:517 Code: 48 44 89 f6 83 e6 01 31 ff e8 63 90 0a 00 41 83 e6 01 49 bc 00 00 00 00 00 fc ff df 75 0a e8 9e 8c 0a 00 e9 a4 00 00 00 f3 90 44 24 48 01 00 00 00 0f 84 8f 00 00 00 e8 84 8c 0a 00 eb e9 e8 RSP: 0018:ffffc90000d17700 EFLAGS: 00000293 RAX: ffffffff815a2a3c RBX: 0000000000000000 RCX: ffff88810ebea800 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000d177f0 R08: ffff8881f7057687 R09: 1ffff1103ee0aed0 R10: dffffc0000000000 R11: ffffed103ee0aed1 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff920001a2ee4 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055a379e33af8 CR3: 000000000640f000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smp_call_function_many_cond+0x8f5/0x9d0 kernel/smp.c:653 smp_call_function_many kernel/smp.c:716 [inline] smp_call_function kernel/smp.c:738 [inline] on_each_cpu+0xab/0x180 kernel/smp.c:837 text_poke_sync arch/x86/kernel/alternative.c:1568 [inline] text_poke_bp_batch+0x1cb/0x5f0 arch/x86/kernel/alternative.c:1768 text_poke_flush arch/x86/kernel/alternative.c:1959 [inline] text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1966 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:126 __jump_label_update+0x38f/0x3b0 kernel/jump_label.c:459 jump_label_update+0x34c/0x3e0 kernel/jump_label.c:825 static_key_enable_cpuslocked+0x126/0x240 kernel/jump_label.c:177 static_key_enable+0x1a/0x30 kernel/jump_label.c:190 toggle_allocation_gate+0xba/0x440 mm/kfence/core.c:624 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301 worker_thread+0xa8e/0x13c0 kernel/workqueue.c:2447 kthread+0x324/0x3b0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298