rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=87673, q=70 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10496 (4295046399-4295035903), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10496 jiffies! g87673 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:26880 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:2167
 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: 12343 Comm: syz.0.2134 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__unsafe_setup_sigcontext arch/x86/kernel/signal.c:-1 [inline]
RIP: 0010:__setup_rt_frame arch/x86/kernel/signal.c:486 [inline]
RIP: 0010:setup_rt_frame arch/x86/kernel/signal.c:784 [inline]
RIP: 0010:handle_signal arch/x86/kernel/signal.c:828 [inline]
RIP: 0010:arch_do_signal_or_restart+0xbd5/0x1240 arch/x86/kernel/signal.c:873
Code: c1 e9 03 48 b8 00 00 00 00 00 fc ff df 48 89 4c 24 60 80 3c 01 00 74 08 4c 89 ff e8 45 5e a4 00 49 8b 07 49 89 86 b0 00 00 00 <48> 8b 44 24 10 4c 8d a8 90 00 00 00 4c 89 e8 48 c1 e8 03 48 b9 00
RSP: 0018:ffffc9001c127ca0 EFLAGS: 00040246
RAX: 00007f5a1265589b RBX: ffffc9001c127f58 RCX: 1ffff92003824ffb
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9001c127ec0 R08: 0000000000000000 R09: fffff52003824f72
R10: fffff52003824f72 R11: 1ffff92003824f6c R12: 0000000000000000
R13: ffff88802db0a720 R14: 00007ffe4dc79438 R15: ffffc9001c127fd8
FS:  000055557bf54500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f615ff8 CR3: 000000002782b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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: 0033:0x7f5a1265589b
Code: 54 24 10 66 89 02 e9 71 fd ff ff 48 8b 44 24 08 48 85 c0 0f 85 6c fe ff ff 48 8b 44 24 10 0f b6 54 24 18 88 10 e9 52 fd ff ff <48> 8b 44 24 20 48 0b 44 24 28 75 31 48 8b 54 24 08 48 85 d2 74 17
RSP: 002b:00007ffe4dc799e0 EFLAGS: 00000246
RAX: 0000000000000004 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 1b2e72ff9068fb12 RSI: 0000000000000000 RDI: 000055557bf543c8
RBP: 00007ffe4dc79ae8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000004
R13: 00007f5a129e6180 R14: fffffffffffffffe R15: 00007ffe4dc79b30
 </TASK>