rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=a9f4/1/0x4000000000000000 softirq=53982/53991 fqs=5223 rcu: hardirqs softirqs csw/system rcu: number: 5262 0 0 rcu: cputime: 122 52377 2 ==> 52520(ms) rcu: (t=10503 jiffies g=39189 q=3019 ncpus=2) CPU: 1 UID: 0 PID: 10895 Comm: syz.4.1260 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:hfsc_classify net/sched/sch_hfsc.c:1171 [inline] RIP: 0010:hfsc_enqueue+0x573/0xf20 net/sched/sch_hfsc.c:1545 Code: c6 31 ff 89 c6 e8 3d e3 5c f8 45 85 f6 74 1d e8 e3 b8 41 f8 41 89 c6 31 ff 89 c6 e8 27 e3 5c f8 45 85 f6 74 2c e8 dd de 5c f8 05 e8 d6 de 5c f8 4d 85 ff 0f 84 2f 05 00 00 e8 c8 de 5c f8 4d RSP: 0018:ffffc90000a08720 EFLAGS: 00000246 RAX: ffffffff896418e3 RBX: dffffc0000000000 RCX: ffff88802842db80 RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000a08810 R08: ffff88802842db80 R09: 0000000000000004 R10: 0000000000000008 R11: 0000000000000100 R12: ffff8880317a9000 R13: ffff8880317a9290 R14: 0000000000000001 R15: ffff88807f37fa00 FS: 000055558d07d500(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c38bebe CR3: 00000000772d0000 CR4: 00000000003526f0 Call Trace: dev_qdisc_enqueue+0x4e/0x240 net/core/dev.c:4134 __dev_xmit_skb net/core/dev.c:4249 [inline] __dev_queue_xmit+0x18d8/0x31c0 net/core/dev.c:4785 neigh_output include/net/neighbour.h:556 [inline] ip_finish_output2+0xbb6/0x1000 net/ipv4/ip_output.c:237 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_output+0x29f/0x450 net/ipv4/ip_output.c:438 igmpv3_send_cr net/ipv4/igmp.c:726 [inline] igmp_ifc_timer_expire+0xbb6/0xde0 net/ipv4/igmp.c:816 call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:kasan_check_range+0x1d4/0x2c0 mm/kasan/generic.c:200 Code: 01 f3 49 8d 5c 24 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 12 41 80 3b 00 0f 85 b8 00 00 00 49 ff c3 49 ff cc 75 ee 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 45 84 ff 75 63 41 f7 RSP: 0018:ffffc90010d1fb08 EFLAGS: 00000256 RAX: ffffffff8b502001 RBX: ffff8880577dacc0 RCX: ffffffff8b502017 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8880577dacd8 RBP: ffff888020eff148 R08: ffff8880577dacdb R09: 1ffff1100aefb59b R10: dffffc0000000000 R11: ffffed100aefb59c R12: 0000000000000001 R13: ffff8880577dacc0 R14: ffffed100aefb59c R15: 1ffff1100aefb59b instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline] __refcount_sub_and_test include/linux/refcount.h:389 [inline] __refcount_dec_and_test include/linux/refcount.h:432 [inline] refcount_dec_and_test include/linux/refcount.h:450 [inline] kref_put include/linux/kref.h:64 [inline] klist_dec_and_del+0x27/0x3d0 lib/klist.c:206 klist_put lib/klist.c:217 [inline] klist_del+0xa6/0x110 lib/klist.c:230 device_del+0x4ba/0x8e0 drivers/base/core.c:3872 rfkill_unregister+0xba/0x220 net/rfkill/core.c:1143 nfc_unregister_device+0xda/0x330 net/nfc/core.c:1175 virtual_ncidev_close+0x56/0x90 drivers/nfc/virtual_ncidev.c:172 __fput+0x44c/0xa70 fs/file_table.c:468 task_work_run+0x1d4/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0xef/0x4e0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9cdd18f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffedeaa8af8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00000000000461d9 RCX: 00007f9cdd18f749 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f9cdd3e7da0 R08: 0000000000000001 R09: 0000001edeaa8def R10: 0000001b30120000 R11: 0000000000000246 R12: 00007f9cdd3e5fac R13: 00007f9cdd3e5fa0 R14: ffffffffffffffff R15: 00007ffedeaa8c10 sched: DL replenish lagged too much