rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 5415 jiffies s: 36193 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 25 Comm: kworker/1:0 Not tainted 6.10.0-rc7-syzkaller-00012-g34afb82a3c67 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: events fqdir_free_fn
RIP: 0010:__lock_acquire+0xec2/0x3b30 kernel/locking/lockdep.c:5107
Code: 64 f2 ff ff 48 63 5c 24 20 be 08 00 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 c0 52 26 94 e8 16 13 7e 00 48 0f a3 1d fe b6 ba 12 <0f> 82 12 fb ff ff 90 e8 42 1b 14 03 85 c0 74 3c 48 c7 c0 d4 69 e4
RSP: 0018:ffffc90000a18918 EFLAGS: 00000047
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff816b9bba
RDX: fffffbfff284ca59 RSI: 0000000000000008 RDI: ffffffff942652c0
RBP: 0000000000000060 R08: 0000000000000000 R09: fffffbfff284ca58
R10: ffffffff942652c7 R11: 0000000000000004 R12: ffffed1002fdc51b
R13: ffff888017ee28e0 R14: ffff888017ee2980 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e40dff8 CR3: 00000000671cc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
 debug_object_activate+0x199/0x540 lib/debugobjects.c:708
 debug_hrtimer_activate kernel/time/hrtimer.c:423 [inline]
 debug_activate kernel/time/hrtimer.c:478 [inline]
 enqueue_hrtimer+0x25/0x3c0 kernel/time/hrtimer.c:1085
 __run_hrtimer kernel/time/hrtimer.c:1706 [inline]
 __hrtimer_run_queues+0xaac/0xcc0 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x43/0xb0 arch/x86/kernel/apic/apic.c:1043
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:handle_softirqs+0x1da/0x8f0 kernel/softirq.c:540
Code: 89 44 24 18 48 89 6c 24 10 48 c7 c7 80 4f 2b 8b e8 db 83 95 09 65 66 c7 05 b9 ec b1 7e 00 00 e8 5c 3f 43 00 fb bb ff ff ff ff <49> c7 c6 c0 a0 80 8d 41 0f bc dc 83 c3 01 0f 85 a7 00 00 00 e9 b4
RSP: 0018:ffffc90000a18f30 EFLAGS: 00000206
RAX: 000000000038f99c RBX: 00000000ffffffff RCX: 1ffffffff285a4c7
RDX: 0000000000000000 RSI: ffffffff8b2caf00 RDI: ffffffff8b8ff640
RBP: ffff888017ee1e00 R08: 0000000000000001 R09: fffffbfff284ca7a
R10: ffffffff942653d7 R11: 0000000000000003 R12: 0000000000000386
R13: 000000000000000a R14: 0000000000000001 R15: 0000000000000000
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline]
RIP: 0010:smp_call_function_single+0x1f0/0x650 kernel/smp.c:650
Code: de 89 fa c1 e2 10 09 d0 89 84 24 8c 00 00 00 e8 86 fa ff ff 41 89 c5 0f 1f 44 00 00 e8 69 1d 0c 00 eb 07 e8 62 1d 0c 00 f3 90 <8b> 9c 24 88 00 00 00 31 ff 83 e3 01 89 de e8 4d 18 0c 00 85 db 75
RSP: 0018:ffffc900001f7b00 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff8181c743
RDX: ffff888017ee1e00 RSI: ffffffff8181c72e RDI: 0000000000000005
RBP: ffffc900001f7c08 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000003 R12: 1ffff9200003ef64
R13: 0000000000000000 R14: 0000000000000001 R15: ffff8880b923fac0
 rcu_barrier+0x284/0x6c0 kernel/rcu/tree.c:4500
 fqdir_free_fn+0x32/0x160 net/ipv4/inet_fragment.c:167
 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3248
 process_scheduled_works kernel/workqueue.c:3329 [inline]
 worker_thread+0x6c8/0xf30 kernel/workqueue.c:3409
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>