rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=9825, q=115 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10402 (4294960237-4294949835), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10402 jiffies! g9825 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:25896 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14b5/0x43c0 kernel/sched/core.c:6699
 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:prepare_to_swait_event+0x7/0x360 kernel/sched/swait.c:103
Code: 8b 7c 24 10 48 8b 74 24 20 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d e9 07 9a 58 05 0f 0b eb 99 0f 1f 00 f3 0f 1e fa 55 41 57 <41> 56 41 55 41 54 53 48 83 ec 28 89 d3 49 89 f7 48 89 fd 49 bd 00
RSP: 0018:ffffc90000157c68 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: f498172735743f00
RDX: 0000000000000402 RSI: ffffc90000157d60 RDI: ffffffff882cc3d8
RBP: ffffc90000157df0 R08: ffffffff8919076f R09: 1ffffffff12320ed
R10: dffffc0000000000 R11: fffffbfff12320ee R12: ffff888014e69a00
R13: ffffc90000067740 R14: ffffc90000157d68 R15: 0000000000000000
 rcu_gp_fqs_loop+0x2cd/0x11e0 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9b/0x2d0 kernel/rcu/tree.c:1866
 kthread+0x274/0x2f0 kernel/kthread.c:388
 ret_from_fork+0x2f/0x60 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </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: 3094 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__lock_acquire+0xfc4/0x7c80 kernel/locking/lockdep.c:-1
Code: ff 1f 00 00 41 c1 ec 03 41 81 e4 00 60 00 00 41 09 c4 4c 89 fe 48 c1 ee 20 89 f0 c1 c0 04 41 29 f4 44 31 e0 44 01 fe 41 29 c7 <89> c1 c1 c1 06 44 31 f9 01 f0 89 ca c1 c2 08 29 ce 31 f2 01 c1 29
RSP: 0018:ffffc9000223ee00 EFLAGS: 00000006
RAX: 00000000ffffffc5 RBX: 0000000000000000 RCX: ffffffff91375f01
RDX: 0000000000000000 RSI: 00000000fffffffe RDI: ffffffff8b26f000
RBP: ffffc9000223f048 R08: dffffc0000000000 R09: 1ffffffff164de00
R10: dffffc0000000000 R11: fffffbfff164de01 R12: 000000000000003a
R13: ffff888079628000 R14: ffff888079628aa0 R15: 000000000000003a
FS:  000055557aef4500(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000001b193000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
 finish_lock_switch kernel/sched/core.c:5132 [inline]
 finish_task_switch+0x19f/0x820 kernel/sched/core.c:5252
 context_switch kernel/sched/core.c:5383 [inline]
 __schedule+0x14bd/0x43c0 kernel/sched/core.c:6699
 preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_schedule_thunk+0x1c/0x30 arch/x86/entry/thunk_64.S:45
Code: 1e fa 48 c7 c0 40 40 a0 86 c3 cc cc cc cc f3 0f 1e fa 55 48 89 e5 57 56 52 51 50 41 50 41 51 41 52 41 53 e8 06 f3 7b 05 41 5b <41> 5a 41 59 41 58 58 59 5a 5e 5f 5d c3 90 90 90 90 90 90 90 f3 0f
RSP: 0018:ffffc9000223f590 EFLAGS: 00000246
RAX: c2a1d433e44b8500 RBX: 0000000000000a06 RCX: c2a1d433e44b8500
RDX: dffffc0000000000 RSI: ffffffff86a65e80 RDI: ffffffff86de18c0
RBP: ffffc9000223f5d0 R08: ffffffff8919076f R09: 1ffffffff12320ed
R10: dffffc0000000000 R11: fffffbfff12320ee R12: dffffc0000000000
R13: 0000000000000003 R14: ffff88807849bc90 R15: 1ffff92000447ebc
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0xfa/0x110 kernel/locking/spinlock.c:194
 free_poll_entry fs/select.c:132 [inline]
 poll_freewait+0x8d/0x1e0 fs/select.c:141
 do_select+0x1326/0x13c0 fs/select.c:609
 core_sys_select+0x521/0x6a0 fs/select.c:678
 do_pselect fs/select.c:760 [inline]
 __do_sys_pselect6 fs/select.c:801 [inline]
 __se_sys_pselect6+0x1d2/0x250 fs/select.c:792
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f195a98e96c
Code: 29 44 24 30 80 3d 0b 9c 21 00 00 4c 89 4c 24 40 4c 8d 4c 24 40 48 c7 44 24 48 08 00 00 00 74 2e 4c 89 ea b8 0e 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7c 48 8b 54 24 58 64 48 2b 14 25 28 00 00 00
RSP: 002b:00007ffd9c2f01e0 EFLAGS: 00000202 ORIG_RAX: 000000000000010e
RAX: ffffffffffffffda RBX: 00007ffd9c2f0310 RCX: 00007f195a98e96c
RDX: 0000000000000000 RSI: 00007ffd9c2f0310 RDI: 0000000000000020
RBP: 00007ffd9c2f0550 R08: 00007ffd9c2f0210 R09: 00007ffd9c2f0220
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd9c2f05b0
R13: 0000000000000000 R14: 00007ffd9c2f0760 R15: 00007ffd9c2f03a0
 </TASK>
sched: RT throttling activated