rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=9e44/1/0x4000000000000000 softirq=31945/31948 fqs=95
rcu: 	(detected by 1, t=10502 jiffies, g=42829, q=1792 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11109 Comm: modprobe Not tainted 6.4.0-rc5-syzkaller-00142-g04c55383fa56 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
RIP: 0010:separate_irq_context kernel/locking/lockdep.c:4606 [inline]
RIP: 0010:__lock_acquire+0xa02/0x5f30 kernel/locking/lockdep.c:5072
Code: 74 79 48 8b 4c 24 28 48 8d 04 80 4c 8d 64 c1 d8 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 21 48 89 fa 48 c1 ea 03 0f b6 04 02 <48> 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 ab 54 00 00 49 8d 7f 21
RSP: 0018:ffffc90000007bc8 EFLAGS: 00000802
RAX: 0000000000000000 RBX: 5f154898ded5cb00 RCX: ffff888044a1a888
RDX: 1ffff11008943515 RSI: 0000000000000008 RDI: ffff888044a1a8a9
RBP: ffff888044a19dc0 R08: 0000000000000001 R09: ffffffff91529d0f
R10: fffffbfff22a53a1 R11: 0000000000000000 R12: ffff888044a1a888
R13: ffff888044a1a8d2 R14: 0000000000000000 R15: ffff888044a1a8b0
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3b72140290 CR3: 000000004870a000 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:5705 [inline]
 lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x23e/0xbe0 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x320/0x7b0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x14a/0x430 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lockdep_init_map_type+0x0/0x810 kernel/locking/lockdep.c:4837
Code: 0c 24 e8 f3 05 71 00 48 8b 0c 24 e9 90 f9 ff ff 48 89 cf e8 e2 05 71 00 48 8b 0c 24 e9 59 f9 ff ff 66 0f 1f 84 00 00 00 00 00 <f3> 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 41 56 49 89 d6 41 55 41
RSP: 0018:ffffc900066f7878 EFLAGS: 00000246
RAX: 0000000000000046 RBX: ffff888076980e58 RCX: 0000000000000000
RDX: ffffffff9015b340 RSI: ffffffff8a4acec0 RDI: ffff888076980ec8
RBP: ffffffff8a4acec0 R08: 0000000000000003 R09: 0000000000000000
R10: ffff888076980e58 R11: 0000000000094001 R12: ffffffff9015b340
R13: ffff88807b1d9a00 R14: 00007f3b71eb6000 R15: ffffc900066f7cd8
 lockdep_init_map_waits include/linux/lockdep.h:192 [inline]
 lockdep_init_map_wait include/linux/lockdep.h:199 [inline]
 __init_rwsem+0x37/0x1b0 kernel/locking/rwsem.c:318
 vma_lock_alloc kernel/fork.c:467 [inline]
 vm_area_dup+0xa1/0x300 kernel/fork.c:516
 __split_vma+0x199/0x830 mm/mmap.c:2248
 do_vmi_align_munmap+0x400/0x1580 mm/mmap.c:2398
 do_vmi_munmap+0x26e/0x2c0 mm/mmap.c:2530
 mmap_region+0x1f0/0x28d0 mm/mmap.c:2578
 do_mmap+0x831/0xf60 mm/mmap.c:1394
 vm_mmap_pgoff+0x1a2/0x3b0 mm/util.c:543
 ksys_mmap_pgoff+0x41f/0x5a0 mm/mmap.c:1440
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3b7215cb74
Code: 63 08 44 89 e8 5b 41 5c 41 5d c3 41 89 ca 41 f7 c1 ff 0f 00 00 74 0c c7 05 f5 46 01 00 16 00 00 00 eb 17 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 dc 46 01 00 48 83 c8 ff c3 0f
RSP: 002b:00007ffddac2cca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ffddac2cd20 RCX: 00007f3b7215cb74
RDX: 0000000000000001 RSI: 0000000000007000 RDI: 00007f3b71eaf000
RBP: 00007ffddac2d080 R08: 0000000000000000 R09: 000000000001b000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007f3b7213ffc0
R13: 00007ffddac2d108 R14: 000000000001a43e R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10128 jiffies! g42829 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:28408 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0xc9a/0x5880 kernel/sched/core.c:6669
 schedule+0xde/0x1a0 kernel/sched/core.c:6745
 schedule_timeout+0x14e/0x2b0 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1609
 rcu_gp_kthread+0x23a/0x360 kernel/rcu/tree.c:1808
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 5092 Comm: kworker/1:5 Not tainted 6.4.0-rc5-syzkaller-00142-g04c55383fa56 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Workqueue: events fqdir_free_fn
RIP: 0010:csd_lock_wait kernel/smp.c:285 [inline]
RIP: 0010:smp_call_function_single+0x1fb/0x680 kernel/smp.c:617
Code: 00 00 00 66 44 89 ac 24 8e 00 00 00 4c 89 e6 e8 bb fa ff ff 41 89 c5 0f 1f 44 00 00 e8 2e 1d 0b 00 eb 07 e8 27 1d 0b 00 f3 90 <44> 8b a4 24 88 00 00 00 31 ff 41 83 e4 01 44 89 e6 e8 2f 19 0b 00
RSP: 0018:ffffc90004db7b40 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff920009b6f6c RCX: 0000000000000000
RDX: ffff888076298000 RSI: ffffffff81792929 RDI: 0000000000000005
RBP: ffffc90004db7c60 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000094001 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc6e7b831b8 CR3: 0000000054f86000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 rcu_barrier+0x283/0x6a0 kernel/rcu/tree.c:4013
 fqdir_free_fn+0x32/0x160 net/ipv4/inet_fragment.c:164
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>