rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=17901, q=557 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294966302-4294955799), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g17901 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:27968 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1821/0x5740 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7283
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x389/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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 UID: 0 PID: 6106 Comm: syz.4.21 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:asm_sysvec_apic_timer_interrupt+0x0/0x20 arch/x86/include/asm/idtentry.h:697
Code: 36 2a a7 0a e9 81 06 00 00 90 f3 0f 1e fa 0f 01 ca fc 6a ff e8 31 05 00 00 48 89 c4 48 89 e7 e8 46 29 a7 0a e9 61 06 00 00 90 <f3> 0f 1e fa 0f 01 ca fc 6a ff e8 11 05 00 00 48 89 c4 48 89 e7 e8
RSP: 0018:ffffc900024ef848 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8e215e66 RDI: ffffffff8c28b6e0
RBP: 0000000000000097 R08: ffffc900024ef9cf R09: ffffc900024ef9b0
R10: dffffc0000000000 R11: fffff5200049df3a R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff8bc69c20 R15: 0000000000000000
FS:  00007fd23aca16c0(0000) GS:ffff88812539e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 00000000122bd000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
RIP: 0010:__might_resched+0x39/0x4d0 kernel/sched/core.c:9125
Code: 83 ec 20 89 d3 89 74 24 04 48 89 7c 24 08 e8 3e e7 11 0a 85 c0 74 46 48 c7 c7 00 cd 95 8e be ff ff ff ff e8 e9 e3 11 0a 85 c0 <74> 31 e8 20 e7 11 0a 85 c0 74 28 80 3d be ae 84 0e 00 75 1f c6 05
RSP: 0018:ffffc900024ef870 EFLAGS: 00000246
 __might_fault+0x76/0x130 mm/memory.c:7338
 __copy_to_user include/linux/uaccess.h:151 [inline]
 save_xstate_epilog arch/x86/kernel/fpu/signal.c:121 [inline]
 copy_fpstate_to_sigframe+0xb16/0xd60 arch/x86/kernel/fpu/signal.c:232
 get_sigframe+0x5f7/0x820 arch/x86/kernel/signal.c:163
 x64_setup_rt_frame+0x160/0xcb0 arch/x86/kernel/signal_64.c:175
 setup_rt_frame arch/x86/kernel/signal.c:250 [inline]
 handle_signal arch/x86/kernel/signal.c:294 [inline]
 arch_do_signal_or_restart+0x442/0x840 arch/x86/kernel/signal.c:339
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0xa9/0x680 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd239d9ce57
Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89
RSP: 002b:00007fd23aca10e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fd23a015fa8 RCX: 00007fd239d9ce59
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd23a015fa8
RBP: 00007fd23a015fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd23a016038 R14: 00007ffc7adffd10 R15: 00007ffc7adffdf8
 </TASK>