R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9cdffcb038 R14: 00007f9cdffcafa0 R15: 00007ffe64aa1728
 </TASK>
watchdog: BUG: soft lockup - CPU#0 stuck for 287s! [syz.3.467:1979]
Modules linked in:
CPU: 0 PID: 1979 Comm: syz.3.467 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:qdisc_lookup+0x26a/0x4e0 net/sched/sch_api.c:310
Code: 80 3c 28 00 74 08 4c 89 f7 e8 62 2b ce fd 4d 8b 36 4d 85 f6 0f 84 ba 00 00 00 49 83 c6 10 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 f7 e8 3c 2b ce fd 4d 8b 36 4d 8d 7e 40 4c 89 f8 48 c1
RSP: 0018:ffffc90000a36da8 EFLAGS: 00000246
RAX: 1ffff11025052c82 RBX: 00000000ffff0000 RCX: 0000000000080000
RDX: ffffc90003b35000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90000a36dd8 R08: ffff888100bb2780 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888128296410 R15: 0000000000000000
FS:  00007f9cde7ac6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9cd8000020 CR3: 000000010bd35000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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: 0033:0x7f9cdfd51e59
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:00007f9cde7ac028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f9cdffcafa0 RCX: 00007f9cdfd51e59
RDX: 040000000000009f RSI: 00002000000002c0 RDI: 000000000000000a
RBP: 00007f9cdfde7d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9cdffcb038 R14: 00007f9cdffcafa0 R15: 00007ffe64aa1728
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 584 Comm: kworker/u4:5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0x8f3/0xa10 kernel/smp.c:969
Code: 31 ff e8 30 51 0a 00 83 e3 01 48 8b 5c 24 10 75 07 e8 71 4d 0a 00 eb 42 f3 90 48 b8 00 00 00 00 00 fc ff df 41 0f b6 44 05 00 <84> c0 75 10 41 f7 07 01 00 00 00 74 1e e8 4b 4d 0a 00 eb da 44 89
RSP: 0018:ffffc90000ae7860 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8881f7138e80 RCX: ffff88811c7262c0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000ae7978 R08: ffff8881f7038ec7 R09: 1ffff1103ee071d8
R10: dffffc0000000000 R11: ffffed103ee071d9 R12: 1ffff1103ee271d0
R13: 1ffff1103ee07af9 R14: 0000000000000000 R15: ffff8881f703d7c8
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f21bbc61000 CR3: 000000000660f000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x43/0x80 kernel/smp.c:1134
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1442 [inline]
 text_poke_bp_batch+0x1d4/0x600 arch/x86/kernel/alternative.c:1642
 text_poke_flush arch/x86/kernel/alternative.c:1833 [inline]
 text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1840
 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:146
 __jump_label_update+0x37c/0x3a0 kernel/jump_label.c:459
 jump_label_update+0x39b/0x450 kernel/jump_label.c:830
 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:783
 process_one_work+0x6be/0xba0 kernel/workqueue.c:2328
 worker_thread+0xa59/0x1200 kernel/workqueue.c:2475
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>