rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=b7fc/1/0x4000000000000000 softirq=485705/485705 fqs=0
rcu: 	(t=10500 jiffies g=376105 q=68 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g376105 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=203842
rcu: rcu_preempt kthread starved for 10500 jiffies! g376105 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:27224 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3898 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:rcu_read_lock_bh_held+0xb8/0xe0 kernel/rcu/update.c:377
Code: 75 18 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 31 db f6 44 24 21 02 0f 94 c3 48 c7 04 24 0e 36 e0 45 4b c7 04 3e 00 00 00 00 <65> 48 8b 05 a0 2d c9 10 48 3b 44 24 50 75 12 89 d8 48 8d 65 e8 5b
RSP: 0018:ffffc900000073e0 EFLAGS: 00000206
RAX: 0000000000000301 RBX: 0000000000000001 RCX: c0d7d32275d43300
RDX: ffff88802f368000 RSI: ffffffff8bbf0740 RDI: ffff8880b883b028
RBP: ffffc90000007460 R08: 0000000000000000 R09: 0000000000000004
R10: 0000000000000008 R11: 0000000000000100 R12: ffff88806b03781c
R13: ffff888055c7d100 R14: 1ffff92000000e7c R15: dffffc0000000000
FS:  00007fae4ec83880(0000) GS:ffff88812613b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000057eff8 CR3: 000000007d032000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __tcf_classify net/sched/cls_api.c:1728 [inline]
 tcf_classify+0x563/0x1140 net/sched/cls_api.c:1860
 hfsc_classify net/sched/sch_hfsc.c:1146 [inline]
 hfsc_enqueue+0x323/0xf20 net/sched/sch_hfsc.c:1545
 dev_qdisc_enqueue+0x4e/0x260 net/core/dev.c:4118
 __dev_xmit_skb net/core/dev.c:4214 [inline]
 __dev_queue_xmit+0xe83/0x3b50 net/core/dev.c:4729
 neigh_output include/net/neighbour.h:547 [inline]
 ip_finish_output2+0xd40/0x1160 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+0x17e/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x286/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5893
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 eb ea d0 10 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000432fa68 EFLAGS: 00000206
RAX: c0d7d32275d43300 RBX: 0000000000000202 RCX: c0d7d32275d43300
RDX: 0000000000000002 RSI: ffffffff8d8f4c01 RDI: ffffffff8bbf0760
RBP: ffff88802f368b80 R08: 742e38343a343163 R09: 742e38343a343163
R10: 0000000000000000 R11: 000000000000706d R12: 0000000000000002
R13: 0000000000000002 R14: ffffffff8df3d6e0 R15: ffff88802f368000
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:897 [inline]
 take_dentry_name_snapshot+0x4eb/0x500 fs/dcache.c:385
 vfs_rename+0x5ac/0xe80 fs/namei.c:5160
 do_renameat2+0x6a2/0xa50 fs/namei.c:5364
 __do_sys_rename fs/namei.c:5411 [inline]
 __se_sys_rename fs/namei.c:5409 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:5409
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fae4e47acc7
Code: e8 5e a7 09 00 f7 d8 19 c0 5b c3 0f 1f 84 00 00 00 00 00 b8 ff ff ff ff 5b c3 66 0f 1f 84 00 00 00 00 00 b8 52 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 01 61 17 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffc68d8ed88 EFLAGS: 00000202 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0000556fa6c8dfd0 RCX: 00007fae4e47acc7
RDX: 0000556fa6c69010 RSI: 00007ffc68d8eda0 RDI: 00007ffc68d8f1a0
RBP: 0000556fa6c900d0 R08: 00000000000001e0 R09: 0000000000000000
R10: 00000000000001b6 R11: 0000000000000202 R12: 00007ffc68d8eda0
R13: 00007ffc68d8f1a0 R14: 0000556f86bf2100 R15: 0000556f86bf2140
 </TASK>
CPU: 1 UID: 0 PID: 5838 Comm: kworker/1:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: mld mld_ifc_work
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d f3 c0 21 00 f3 0f 1e fa fb f4 <e9> c8 e6 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000413ef78 EFLAGS: 000002d3
RAX: ffffffff8172bd9d RBX: 0000000000000003 RCX: ffff8880326c0000
RDX: 0000000000000000 RSI: ffffffff8d70e033 RDI: ffffffff8bbf0760
RBP: ffffc9000413f050 R08: ffffffff8f7ce977 R09: 1ffffffff1ef9d2e
R10: dffffc0000000000 R11: fffffbfff1ef9d2f R12: dffffc0000000000
R13: 0000000000000200 R14: 0000000000000003 R15: 1ffff92000827df4
FS:  0000000000000000(0000) GS:ffff88812623b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc68d856d8 CR3: 000000005d0d0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 kvm_wait+0x232/0x290 arch/x86/kernel/kvm.c:1080
 pv_wait arch/x86/include/asm/paravirt.h:569 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:466 [inline]
 __pv_queued_spin_lock_slowpath+0x7bf/0xb60 kernel/locking/qspinlock.c:325
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:557 [inline]
 queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x21f/0x290 kernel/locking/spinlock_debug.c:116
 spin_lock include/linux/spinlock.h:351 [inline]
 __dev_xmit_skb net/core/dev.c:4188 [inline]
 __dev_queue_xmit+0xd70/0x3b50 net/core/dev.c:4729
 neigh_output include/net/neighbour.h:547 [inline]
 ip6_finish_output2+0xfb3/0x1480 net/ipv6/ip6_output.c:136
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247
 NF_HOOK+0x9e/0x380 include/linux/netfilter.h:318
 mld_sendpack+0x8d4/0xe60 net/ipv6/mcast.c:1855
 mld_send_cr net/ipv6/mcast.c:2154 [inline]
 mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>