#6: ffffffff87ead320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #6: ffffffff87ead320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #6: ffffffff87ead320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
4 locks held by syz-executor.3/5916:
1 lock held by syz-executor.1/5918:
 #0: ffff88810165d948 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_add_one+0xb1/0x510 fs/kernfs/dir.c:757
=============================================
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (4 ticks this GP) idle=cfec/1/0x4000000000000000 softirq=20218/20218 fqs=0
rcu: 	(t=13194 jiffies g=21285 q=249 ncpus=2)
rcu: rcu_preempt kthread starved for 13194 jiffies! g21285 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:28176 pid:16    tgid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xc71/0x3050 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe7/0x270 kernel/sched/core.c:6778
 schedule_timeout+0x157/0x2c0 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x1ec/0xb10 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0x249/0x380 kernel/rcu/tree.c:1830
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
CPU: 0 PID: 5915 Comm: syz-executor.4 Not tainted 6.7.0-rc5-syzkaller-00172-g933bb7b878dd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x70 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 56 4a e1 fa 48 89 df e8 4e c9 e1 fa f7 c5 00 02 00 00 75 1f 9c 58 f6 c4 02 75 2f <bf> 01 00 00 00 e8 15 3c d6 fa 65 8b 05 d6 6e b6 79 85 c0 74 12 5b
RSP: 0000:ffffc90000007c90 EFLAGS: 00000246

RAX: 0000000000000006 RBX: ffff888101b87218 RCX: 1ffffffff16e6a98
RDX: 0000000000000000 RSI: ffffffff8687cf20 RDI: ffffffff86a68a20
RBP: 0000000000000246 R08: 0000000000000001 R09: fffffbfff16ddd59
R10: ffffffff8b6eeacf R11: 00000000000dd390 R12: 1ffff92000000f96
R13: 0000000000000100 R14: ffffffff84600920 R15: 0000000000000001
FS:  000055555619d480(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8dda3d4576 CR3: 0000000102bcb000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x193/0x580 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x764/0xb10 kernel/time/timer.c:2022
 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035
 __do_softirq+0x20a/0x94b kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0xa7/0x110 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x8e/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5722
Code: c1 05 8d f0 d3 7e 83 f8 01 0f 85 b0 02 00 00 9c 58 f6 c4 02 0f 85 9b 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0000:ffffc9000223fb90 EFLAGS: 00000206

RAX: dffffc0000000000 RBX: 1ffff92000447f74 RCX: 0000000000000001
RDX: 1ffff110235a214e RSI: ffffffff8687d220 RDI: ffffffff86a68a20
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff16ddd44
R10: ffffffff8b6eea27 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff87ead320 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 rcu_read_lock include/linux/rcupdate.h:747 [inline]
 __pte_offset_map+0x42/0x330 mm/pgtable-generic.c:285
 pte_offset_map_nolock+0x84/0x1b0 mm/pgtable-generic.c:312
 handle_pte_fault mm/memory.c:5025 [inline]
 __handle_mm_fault+0x3bc/0x27e0 mm/memory.c:5180
 handle_mm_fault+0x369/0x890 mm/memory.c:5345
 do_user_addr_fault+0x30b/0x1000 arch/x86/mm/fault.c:1364
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x5c/0xd0 arch/x86/mm/fault.c:1561
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f8dda3d45a0
Code: Unable to access opcode bytes at 0x7f8dda3d4576.
RSP: 002b:00007ffefe4176a8 EFLAGS: 00010246

RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f8dda3a9e8d
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 00007f8ddaff7320
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
 </TASK>