rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (2 ticks this GP) idle=665/1/0x4000000000000000 softirq=9550/9550 fqs=109 
	(detected by 0, t=10503 jiffies, g=11161, q=559)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4268 Comm: kworker/1:13 Not tainted 5.15.171-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:rb_next+0x0/0xe0 lib/rbtree.c:493
Code: c6 48 8d 58 08 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 e3 48 89 df e8 8f a7 9c fd eb d9 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <41> 57 41 56 41 54 53 49 89 fc 49 bf 00 00 00 00 00 fc ff df 48 89
RSP: 0018:ffffc90000dd0d20 EFLAGS: 00000006
RAX: ffffffff842e395d RBX: ffff8880b912a3d8 RCX: ffff888029938000
RDX: 0000000000010000 RSI: ffff88807940db40 RDI: ffff88807940db40
RBP: dffffc0000000000 R08: ffffffff842e3924 R09: fffffbfff1bd2cd6
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100f281b68
R13: ffff88807940db40 R14: ffff8880b912a3d0 R15: 1ffff1101722547b
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d95e8fba8 CR3: 000000005cdda000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 rb_erase_cached include/linux/rbtree.h:124 [inline]
 timerqueue_del+0x85/0xf0 lib/timerqueue.c:57
 __remove_hrtimer kernel/time/hrtimer.c:1117 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1668 [inline]
 __hrtimer_run_queues+0x3e9/0xcf0 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x13b/0x4b0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:instrument_atomic_read include/linux/instrumented.h:71 [inline]
RIP: 0010:atomic_long_read include/linux/atomic/atomic-instrumented.h:1183 [inline]
RIP: 0010:__mutex_owner kernel/locking/mutex.c:78 [inline]
RIP: 0010:mutex_spin_on_owner+0x284/0x370 kernel/locking/mutex.c:352
Code: 00 00 e8 5f 61 68 00 48 8b 44 24 28 80 3c 18 00 74 08 48 89 ef e8 bc 5f 68 00 48 f7 45 00 01 00 00 00 0f 85 8c 00 00 00 f3 90 <48> 89 ef be 08 00 00 00 e8 2f 61 68 00 48 8b 44 24 28 80 3c 18 00
RSP: 0018:ffffc900033078b8 EFLAGS: 00000246
RAX: ffff8880b9000000 RBX: dffffc0000000000 RCX: ffffffff8161ea64
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000010
RBP: ffffffff8da321e0 R08: dffffc0000000000 R09: ffffed1005327001
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88802ada9dc0
R13: ffffffff8da32270 R14: ffffffff8da32230 R15: dffffc0000000000
 mutex_optimistic_spin+0x38/0x300 kernel/locking/mutex.c:469
 __mutex_lock_common+0x1ff/0x25a0 kernel/locking/mutex.c:599
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 addrconf_dad_work+0xcc/0x1720 net/ipv6/addrconf.c:4113
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: rcu_preempt kthread starved for 9961 jiffies! g11161 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:26432 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 schedule+0x11b/0x1f0 kernel/sched/core.c:6456
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 13 Comm: kworker/0:1 Not tainted 5.15.171-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events fqdir_free_fn
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_check_gp_kthread_starvation+0x1d2/0x240 kernel/rcu/tree_stall.h:487
 print_other_cpu_stall+0x137a/0x14d0 kernel/rcu/tree_stall.h:592
 check_cpu_stall kernel/rcu/tree_stall.h:745 [inline]
 rcu_pending kernel/rcu/tree.c:3932 [inline]
 rcu_sched_clock_irq+0xa38/0x1150 kernel/rcu/tree.c:2619
 update_process_times+0x196/0x200 kernel/time/timer.c:1818
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x386/0x550 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x13b/0x4b0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_single+0x292/0x530 kernel/smp.c:758
Code: 0f 85 24 02 00 00 44 8b 6c 24 48 44 89 ee 83 e6 01 31 ff e8 90 ea 0b 00 41 83 e5 01 75 0a e8 25 e7 0b 00 e9 eb 00 00 00 f3 90 <42> 0f b6 04 23 84 c0 75 15 f7 44 24 48 01 00 00 00 0f 84 cd 00 00
RSP: 0018:ffffc90000d27a60 EFLAGS: 00000293
RAX: ffffffff81748cae RBX: 1ffff920001a4f55 RCX: ffff888017e40000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000d27b50 R08: ffffffff81748c80 R09: ffffed1017227679
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 0000000000000001 R14: ffffc90000d27aa8 R15: 0000000000000000
 rcu_barrier+0x262/0x4e0 kernel/rcu/tree.c:4078
 fqdir_free_fn+0x2e/0x130 net/ipv4/inet_fragment.c:166
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>