rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=7293, q=44 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4294955651-4294945151), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10500 jiffies! g7293 f0x2 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:26712 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: 4274 Comm: syz-executor128 Not tainted 6.1.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__lock_acquire+0xd50/0x1f80 kernel/locking/lockdep.c:5032
Code: 0f 85 aa 0d 00 00 83 3d bd 68 d1 15 00 41 bd 01 00 00 00 75 0a 49 83 ff ff 0f 85 a4 08 00 00 48 89 e8 48 c1 e8 03 80 3c 38 00 <74> 12 48 89 ef e8 e6 43 77 00 48 bf 00 00 00 00 00 fc ff df 4c 89
RSP: 0018:ffffc90003f779c0 EFLAGS: 00000046
RAX: 1ffff1100497bc84 RBX: ffff888024bde410 RCX: ffffffff973c3103
RDX: 0000000000000000 RSI: 0000000000000008 RDI: dffffc0000000000
RBP: ffff888024bde420 R08: dffffc0000000000 R09: fffffbfff2257853
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888024bde418
R13: 0000000000000001 R14: ffff888024bde440 R15: ffffffffffffffff
FS:  00005555749673c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 00000000273c8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __might_fault+0xbd/0x110 mm/memory.c:5852
 _copy_to_user+0x26/0x130 lib/usercopy.c:36
 copy_to_user include/linux/uaccess.h:169 [inline]
 copy_siginfo_to_user+0x20/0x140 kernel/signal.c:3339
 __setup_rt_frame arch/x86/kernel/signal.c:491 [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+0xb99/0x1a10 arch/x86/kernel/signal.c:873
 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: 0033:0x7f51bac1a899
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 19 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 01 48
RSP: 002b:00007ffd894f1368 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f51bac1a899
RDX: 000020000006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007f51babda990 R09: 00007f51babda990
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f51bac7833c
R13: 00007f51bac72106 R14: 00007ffd894f13a0 R15: 0000000000000000
 </TASK>