rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=59161, q=26 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294990645-4294980142), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g59161 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:26304 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:1965
 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:
CPU: 1 PID: 10048 Comm: syz.4.1568 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:fpregs_mark_activate+0x59/0x80 arch/x86/kernel/fpu/core.c:782
Code: 48 ba 00 00 00 00 00 fc ff df 0f b6 0c 11 84 c9 75 1d 89 83 00 19 00 00 48 89 df be 08 00 00 00 e8 7c 08 a2 00 f0 80 63 01 bf <5b> 41 5e 5d c3 44 89 f2 80 e2 07 80 c2 03 38 ca 7c d6 4c 89 f7 89
RSP: 0018:ffffc90003e07b20 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff888075488000 RCX: ffffffff812ef534
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888075488000
RBP: ffffc90003e07cf0 R08: dffffc0000000000 R09: ffffed100ea91001
R10: ffffed100ea91001 R11: 1ffff1100ea91000 R12: 1ffff920007c0f74
R13: 0000000000000000 R14: ffff888075489900 R15: dffffc0000000000
FS:  00007ff96a46a6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f717ff8 CR3: 000000007c069000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 restore_fpregs_from_user arch/x86/kernel/fpu/signal.c:330 [inline]
 __fpu_restore_sig arch/x86/kernel/fpu/signal.c:359 [inline]
 fpu__restore_sig+0x992/0x1190 arch/x86/kernel/fpu/signal.c:493
 restore_sigcontext arch/x86/kernel/signal.c:140 [inline]
 __ia32_sys_rt_sigreturn+0x649/0x790 arch/x86/kernel/signal.c:675
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff96958eec7
Code: ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89
RSP: 002b:00007ff96a46a0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007ff9697e5fa8 RCX: 00007ff96958eec9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ff9697e5fa8
RBP: 00007ff9697e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff9697e6038 R14: 00007ffce29e4240 R15: 00007ffce29e4328
 </TASK>