R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007effb9619038 R14: 00007effb9618fa0 R15: 00007ffefdf9bd78
watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.1.300:1364]
Modules linked in:
CPU: 0 PID: 1364 Comm: syz.1.300 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x60 kernel/kcov.c:190
Code: 00 00 0f 0b 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb e8 13 00 00 00 48 8b 3d bc bd 5e 05 48 89 de e8 d4 e1 39 00 5b 5d c3 00 55 <48> 89 e5 48 8b 45 08 65 48 8b 0d 20 b7 9d 7e 65 8b 15 25 b7 9d 7e
RSP: 0018:ffffc90000cf6eb8 EFLAGS: 00000286
RAX: 1ffff110250cd880 RBX: 00000000ffff0000 RCX: 0000000000000002
RDX: ffff8881153ecf00 RSI: 00000000ffff0000 RDI: ffff888126368000
RBP: ffffc90000cf6ef8 R08: ffff8881153ecf00 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: 00000000fffffff1
R13: ffff88812866cccc R14: ffff888126368000 R15: ffff88812866cc40
FS:  00007effb7dfa6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000012c841000 CR4: 00000000003526b0
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
 fq_codel_change+0xa6e/0xeb0 net/sched/sch_fq_codel.c:436
 fq_codel_init+0x342/0xa20 net/sched/sch_fq_codel.c:473
 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:5610
 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2503
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5628
 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: 0033:0x7effb939f799
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:00007effb7dfa028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007effb9618fa0 RCX: 00007effb939f799
RDX: 0000000000000000 RSI: 0000200000000640 RDI: 0000000000000005
RBP: 00007effb9435bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007effb9619038 R14: 00007effb9618fa0 R15: 00007ffefdf9bd78
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 112 Comm: kworker/u4:2 Tainted: G        W         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: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 13 88 0a 00 41 83 e6 01 49 bc 00 00 00 00 00 fc ff df 75 0a e8 4e 84 0a 00 e9 a4 00 00 00 f3 90 <f7> 44 24 48 01 00 00 00 0f 84 8f 00 00 00 e8 34 84 0a 00 eb e9 e8
RSP: 0018:ffffc90000bf7720 EFLAGS: 00000293
RAX: ffffffff815a321c RBX: 0000000000000000 RCX: ffff88810fed0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000bf7810 R08: ffff8881f7057647 R09: 1ffff1103ee0aec8
R10: dffffc0000000000 R11: ffffed103ee0aec9 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff9200017eee8
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d54c4f000 CR3: 000000000640f000 CR4: 00000000003526a0
DR0: 0000000000000001 DR1: 0000000000000009 DR2: 000000000000000d
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 smp_call_function_many_cond+0x90a/0xa00 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+0x37c/0x3a0 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+0x6e1/0xba0 kernel/workqueue.c:2301
 worker_thread+0xa6a/0x13c0 kernel/workqueue.c:2447
 kthread+0x346/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298