rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=84221, q=691 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295038146-4295027643), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g84221 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:27584 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </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: 13868 Comm: syz-executor.0 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
RIP: 0010:rcu_is_watching+0x12/0xc0 kernel/rcu/tree.c:724
Code: b6 c0 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 53 65 ff 05 cb a0 8f 7e e8 7e d8 73 09 <48> c7 c3 28 7f 03 00 83 f8 07 89 c5 0f 87 82 00 00 00 48 8d 3c ed
RSP: 0018:ffffc900032bf948 EFLAGS: 00000086
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 1ffff11004b91da9 RSI: ffffffff8b900600 RDI: ffffffff8b900640
RBP: ffff888025c8da00 R08: 0000000000000014 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000010
R13: 0000000000000000 R14: ffff888022dfb000 R15: ffff88805ddc7800
FS:  0000555572925480(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30a4e000 CR3: 000000001cb66000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 rcu_read_lock_held_common kernel/rcu/update.c:109 [inline]
 rcu_read_lock_sched_held+0x20/0x70 kernel/rcu/update.c:124
 task_css_set include/linux/cgroup.h:421 [inline]
 task_dfl_cgroup include/linux/cgroup.h:490 [inline]
 task_psi_group kernel/sched/psi.c:877 [inline]
 psi_task_switch+0x6f0/0x900 kernel/sched/psi.c:972
 psi_sched_switch kernel/sched/stats.h:185 [inline]
 __schedule+0x2587/0x5d00 kernel/sched/core.c:6740
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:io_serial_in+0x87/0xb0 drivers/tty/serial/8250/8250_port.c:407
Code: 0c 90 fc 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1a 66 03 5d 40 89 da ec <5b> 0f b6 c0 5d 41 5c c3 cc cc cc cc e8 a8 df eb fc eb a2 e8 31 e0
RSP: 0018:ffffc900032bfc48 EFLAGS: 00000206
RAX: dffffc0000000013 RBX: 00000000000002eb RCX: 0000000000000000
RDX: 00000000000002eb RSI: ffffffff84fdd860 RDI: ffffffff94de0fa0
RBP: ffffffff94de0f60 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000002 R12: 0000000000000000
R13: ffffffff94de0fb8 R14: ffffffff94de0fb0 R15: 0000000000000000
 serial_port_in include/linux/serial_core.h:674 [inline]
 serial8250_do_shutdown+0x2ec/0x880 drivers/tty/serial/8250/8250_port.c:2497
 serial8250_shutdown+0x59/0x70 drivers/tty/serial/8250/8250_port.c:2523
 uart_port_shutdown+0xf4/0x1a0 drivers/tty/serial/serial_core.c:1924
 uart_tty_port_shutdown+0x107/0x1d0 drivers/tty/serial/serial_core.c:1796
 tty_port_shutdown+0x196/0x280 drivers/tty/tty_port.c:379
 tty_port_close drivers/tty/tty_port.c:720 [inline]
 tty_port_close+0x52/0x160 drivers/tty/tty_port.c:715
 uart_close+0x7b/0x220 drivers/tty/serial/serial_core.c:1776
 tty_release+0x3ad/0x1420 drivers/tty/tty_io.c:1760
 __fput+0x408/0xbb0 fs/file_table.c:422
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4ed387cea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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:00007ffc6ca2e808 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f4ed39b5980 RCX: 00007f4ed387cea9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f4ed39b5980 R08: 00000000813cddb8 R09: 0000001a00000000
R10: 0000000080000000 R11: 0000000000000246 R12: 00000000000dd423
R13: 00007f4ed39b412c R14: 0000000000000032 R15: 00007f4ed39b5980
 </TASK>