rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=63065, q=105 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295015866-4295005364), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g63065 f0x2 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:27800 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 10630 Comm: syz.7.1351 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:mark_lock+0x0/0x320 kernel/locking/lockdep.c:4589
Code: 38 c1 7c 90 48 c7 c7 e8 42 ff 8d e8 aa 56 6d 00 4c 89 f7 41 89 d9 e9 79 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <55> 41 57 41 56 41 55 41 54 53 50 89 d5 49 89 f6 48 89 fb 49 bd 00
RSP: 0018:ffffc900052bf6b8 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffff88802bde2880 RCX: dffffc0000000000
RDX: 0000000000000007 RSI: ffff88802bde28a0 RDI: ffff88802bde1dc0
RBP: ffffc900052bf910 R08: dffffc0000000000 R09: fffffbfff211904f
R10: fffffbfff211904f R11: 1ffffffff211904e R12: ffff88802bde1dc0
R13: ffff88802bde2804 R14: ffff88802bde28a0 R15: ffff88802bde28c0
FS:  00007f4bb716a6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000035d000 CR3: 0000000067139000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mark_usage kernel/locking/lockdep.c:-1 [inline]
 __lock_acquire+0xd4d/0x7c50 kernel/locking/lockdep.c:5003
 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
 __might_fault+0xc2/0x120 mm/memory.c:5852
 __clear_user arch/x86/include/asm/uaccess_64.h:96 [inline]
 copy_fpstate_to_sigframe+0x1a6/0xcb0 arch/x86/kernel/fpu/signal.c:216
 get_sigframe arch/x86/kernel/signal.c:297 [inline]
 __setup_rt_frame arch/x86/kernel/signal.c:472 [inline]
 setup_rt_frame arch/x86/kernel/signal.c:784 [inline]
 handle_signal arch/x86/kernel/signal.c:828 [inline]
 arch_do_signal_or_restart+0x622/0x1240 arch/x86/kernel/signal.c:873
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4bb625f0e9
Code: 48 89 3c 25 c0 fe ff ff eb 20 0f 1f 80 00 00 00 00 45 31 c0 31 c9 ba 80 00 00 00 48 89 de bf ca 00 00 00 31 c0 e8 47 06 13 00 <8b> 03 85 c0 74 e1 c7 45 08 00 00 00 00 45 84 e4 74 2d 80 3d e3 65
RSP: 002b:00007f4bb716a0f0 EFLAGS: 00000217
RAX: 0000000000000000 RBX: 00007f4bb65e5fa8 RCX: 00007f4bb638f749
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f4bb65e5fac
RBP: 00007f4bb65e5fa0 R08: 0015f46d9c35130a R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4bb65e6038 R14: 00007ffeeadf9250 R15: 00007ffeeadf9338
 </TASK>