rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4258/1:b..l
	(detected by 1, t=10503 jiffies, g=6301, q=50 ncpus=2)
task:syz-executor304 state:R  running task     stack:28168 pid:4258  ppid:4245   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6561
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6730
 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6754
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 filemap_map_pages+0xffa/0x12c0 mm/filemap.c:3498
 do_fault_around mm/memory.c:4600 [inline]
 do_read_fault mm/memory.c:4626 [inline]
 do_fault mm/memory.c:4760 [inline]
 handle_pte_fault mm/memory.c:5031 [inline]
 __handle_mm_fault mm/memory.c:5173 [inline]
 handle_mm_fault+0x33e0/0x5340 mm/memory.c:5294
 do_user_addr_fault arch/x86/mm/fault.c:1340 [inline]
 handle_page_fault arch/x86/mm/fault.c:1431 [inline]
 exc_page_fault+0x26f/0x620 arch/x86/mm/fault.c:1487
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f0fdac02c00
RSP: 002b:00007ffd79fcdb38 EFLAGS: 00010246
RAX: 00000000000003ff RBX: 00007ffd79fcdcf0 RCX: 0000000000000000
RDX: 00000000ffffffff RSI: 0000000000008000 RDI: 00007ffd79fcdb50
RBP: 00007ffd79fcdc40 R08: 0000000000000000 R09: 00007f0fdacb7ec0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0fdac7f01d
R13: 00007ffd79fcdcd8 R14: 0000000000000000 R15: 00007ffd79fcdb50
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10520 jiffies! g6301 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=3848
rcu: rcu_preempt kthread starved for 10523 jiffies! g6301 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:26048 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6561
 schedule+0xbf/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4256 Comm: syz-executor304 Not tainted 6.1.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
RIP: 0010:lock_is_held_type+0x10a/0x180 kernel/locking/lockdep.c:5706
Code: c0 31 ed 44 39 f0 40 0f 94 c5 eb 05 bd 01 00 00 00 48 c7 c7 40 30 0c 8b e8 13 16 00 00 b8 ff ff ff ff 65 0f c1 05 06 c1 50 75 <83> f8 01 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02
RSP: 0018:ffffc90000007b70 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000002 RCX: ffff88807e135940
RDX: ffff88807e135940 RSI: ffffffff8b0c3040 RDI: ffffffff8b5f7360
RBP: 0000000000000001 R08: ffffffff8156e198 R09: fffffbfff225784f
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000046
R13: ffff88807e135940 R14: 00000000ffffffff R15: ffff88802f7f4a18
FS:  00007f0fdabe96c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0fdabe8e40 CR3: 000000001ee4d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_is_held include/linux/lockdep.h:283 [inline]
 signal_wake_up_state kernel/signal.c:770 [inline]
 signal_wake_up include/linux/sched/signal.h:457 [inline]
 complete_signal+0x75b/0xbd0 kernel/signal.c:1075
 send_sigqueue+0x44f/0x720 kernel/signal.c:2004
 posix_timer_event kernel/time/posix-timers.c:359 [inline]
 posix_timer_fn+0x186/0x390 kernel/time/posix-timers.c:385
 __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
 __hrtimer_run_queues+0x5e5/0xe50 kernel/time/hrtimer.c:1755
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1817
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x158/0x5b0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: d1 83 f5 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 5e aa ae f6 48 89 df e8 c6 e8 af f6 e8 81 3a d5 f6 fb bf 01 00 00 00 <e8> d6 68 a2 f6 65 8b 05 97 3e 46 75 85 c0 74 02 5b c3 e8 34 62 44
RSP: 0018:ffffc90003d77b30 EFLAGS: 00000286
RAX: 32b32de466d77f00 RBX: ffff88802f7f4a00 RCX: ffffffff973c3103
RDX: dffffc0000000000 RSI: ffffffff8b0c1ec0 RDI: 0000000000000001
RBP: ffffc90003d77c70 R08: dffffc0000000000 R09: ffffed1005efe941
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11005efe9d3
R13: 000000001c000004 R14: 0000000000000021 R15: ffff88802f7f4e98
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x151f/0x17a0 kernel/signal.c:2874
 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0fdac28457
Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89
RSP: 002b:00007f0fdabe9218 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f0fdacb2308 RCX: 00007f0fdac28459
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f0fdacb2308
RBP: 00007f0fdacb2300 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000140
R13: 000020000006b000 R14: 0000200000000100 R15: 0000200000000680
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.117 msecs