RBP: 00007f21abe32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f21ac016038 R14: 00007f21ac015fa0 R15: 00007ffe8cfa5538
 </TASK>
watchdog: BUG: soft lockup - CPU#1 stuck for 254s! [syz.4.1584:5851]
Modules linked in:
CPU: 1 PID: 5851 Comm: syz.4.1584 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:qdisc_lookup_rcu+0x37/0x4e0 net/sched/sch_api.c:324
Code: 50 89 f3 49 89 fe e8 48 1b 68 fd 31 ff 89 de e8 5f 1f 68 fd 85 db 0f 84 dc 00 00 00 49 bd 00 00 00 00 00 fc ff df 4c 89 75 d0 <49> 81 c6 d0 03 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 74 08 4c
RSP: 0018:ffffc9000f95ee48 EFLAGS: 00000286
RAX: ffffffff840952a1 RBX: 00000000ffff0000 RCX: 0000000000000000
RDX: ffff8881219f6540 RSI: 00000000ffff0000 RDI: 0000000000000000
RBP: ffffc9000f95ee78 R08: ffff8881219f6540 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000000 R12: 00000000fffffff1
R13: dffffc0000000000 R14: ffff88810e3b2000 R15: ffff888113fe0840
FS:  00007f21acbc96c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f21abc720c0 CR3: 000000014711c000 CR4: 00000000003526a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 qdisc_tree_reduce_backlog+0x111/0x360 net/sched/sch_api.c:792
 codel_change+0x8cd/0xc10 net/sched/sch_codel.c:177
 codel_init+0x1ea/0x410 net/sched/sch_codel.c:196
 qdisc_create+0x895/0x1180 net/sched/sch_api.c:1306
 tc_modify_qdisc+0x900/0x19d0 net/sched/sch_api.c:-1
 rtnetlink_rcv_msg+0xb3b/0xe00 net/core/rtnetlink.c:6150
 netlink_rcv_skb+0x20f/0x460 net/netlink/af_netlink.c:2521
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6168
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x8ab/0xa30 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x8b9/0xbd0 net/netlink/af_netlink.c:1873
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 ____sys_sendmsg+0x5cc/0x990 net/socket.c:2508
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2562
 __sys_sendmsg net/socket.c:2591 [inline]
 __do_sys_sendmsg net/socket.c:2600 [inline]
 __se_sys_sendmsg net/socket.c:2598 [inline]
 __x64_sys_sendmsg+0x205/0x2d0 net/socket.c:2598
 x64_sys_call+0x171/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f21abd9c799
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:00007f21acbc9028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f21ac015fa0 RCX: 00007f21abd9c799
RDX: 0000000000000000 RSI: 00002000000012c0 RDI: 0000000000000003
RBP: 00007f21abe32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f21ac016038 R14: 00007f21ac015fa0 R15: 00007ffe8cfa5538
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2911 Comm: kworker/u4:38 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:453 [inline]
RIP: 0010:smp_call_function_many_cond+0x893/0x980 kernel/smp.c:998
Code: e6 01 31 ff e8 1e 74 09 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 0a e8 ea 6f 09 00 e9 38 ff ff ff f3 90 41 0f b6 44 1d 00 <84> c0 75 14 41 f7 07 01 00 00 00 0f 84 1a ff ff ff e8 c7 6f 09 00
RSP: 0018:ffffc9000bfdf840 EFLAGS: 00000293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff8881275dd100
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000bfdf978 R08: ffffc9000bfdf7c7 R09: 1ffff920017fbef8
R10: 0000000000000000 R11: fffff520017fbef9 R12: 1ffff1103edc7218
R13: 1ffff1103ede78a5 R14: 0000000000000001 R15: ffff8881f6f3c528
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc98b9c9b60 CR3: 000000000700f000 CR4: 00000000003526b0
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:1165
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1574 [inline]
 text_poke_bp_batch+0x1cf/0x600 arch/x86/kernel/alternative.c:1774
 text_poke_flush arch/x86/kernel/alternative.c:1965 [inline]
 text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1972
 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:146
 __jump_label_update+0x37c/0x3a0 kernel/jump_label.c:451
 jump_label_update+0x39b/0x450 kernel/jump_label.c:797
 static_key_disable_cpuslocked+0xc9/0x1a0 kernel/jump_label.c:203
 static_key_disable+0x1a/0x30 kernel/jump_label.c:211
 toggle_allocation_gate+0x3a5/0x440 mm/kfence/core.c:834
 process_one_work+0x71f/0xc40 kernel/workqueue.c:2302
 worker_thread+0xa29/0x11e0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>