rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (2 ticks this GP) idle=9254/1/0x4000000000000000 softirq=34341/34341 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=31129, q=778 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5841 Comm: syz-executor Not tainted 6.12.0-rc6-syzkaller-01236-gcf6d9fe09185 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:get_current arch/x86/include/asm/current.h:49 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d f4 17 9d 0c 48 89 de 5b e9 93 d8 5d 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 c0 d5 03 00 65 8b 15 50 fb 6e 7e 81 e2 00 01 ff 00
RSP: 0018:ffffc90000a18c88 EFLAGS: 00000002
RAX: ffffffff89cd326a RBX: 0000000000000001 RCX: ffff88802b441e00
RDX: ffff88802b441e00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff89cd325d R09: fffff52000143180
R10: dffffc0000000000 R11: fffff52000143180 R12: 0000000000000002
R13: ffffffff89cd3090 R14: ffff88807f065330 R15: ffff88802475d800
FS:  000055557db1d500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd082259f98 CR3: 000000007cca4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 advance_sched+0x1da/0xca0 net/sched/sch_taprio.c:929
 __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
 __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1755
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5829
Code: 2b 00 74 08 4c 89 f7 e8 8a 56 8e 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc90003b1f060 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000763e18 RCX: 18667461ca30d500
RDX: dffffc0000000000 RSI: ffffffff8c0adc40 RDI: ffffffff8c6109a0
RBP: ffffc90003b1f1b0 R08: ffffffff942dc807 R09: 1ffffffff285b900
R10: dffffc0000000000 R11: fffffbfff285b901 R12: 1ffff92000763e14
R13: dffffc0000000000 R14: ffffc90003b1f0c0 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 rcu_read_lock_sched include/linux/rcupdate.h:941 [inline]
 pfn_valid+0x113/0x450 include/linux/mmzone.h:2042
 page_table_check_set+0x22/0x540 mm/page_table_check.c:110
 __page_table_check_ptes_set+0x30f/0x410 mm/page_table_check.c:225
 page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
 set_ptes include/linux/pgtable.h:267 [inline]
 __copy_present_ptes mm/memory.c:969 [inline]
 copy_present_ptes mm/memory.c:1052 [inline]
 copy_pte_range mm/memory.c:1167 [inline]
 copy_pmd_range+0x4773/0x85f0 mm/memory.c:1255
 copy_pud_range mm/memory.c:1292 [inline]
 copy_p4d_range mm/memory.c:1316 [inline]
 copy_page_range+0x99f/0xe90 mm/memory.c:1414
 dup_mmap kernel/fork.c:746 [inline]
 dup_mm kernel/fork.c:1675 [inline]
 copy_mm+0x1117/0x1e80 kernel/fork.c:1724
 copy_process+0x1845/0x3d50 kernel/fork.c:2374
 kernel_clone+0x226/0x8f0 kernel/fork.c:2786
 __do_sys_clone kernel/fork.c:2929 [inline]
 __se_sys_clone kernel/fork.c:2913 [inline]
 __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2913
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf15774f93
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffcb19441f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcf15774f93
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 000055557db1d7d0 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000002b0f3 R14: 000000000002afac R15: 00007ffcb1944380
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g31129 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=12086
rcu: rcu_preempt kthread starved for 10502 jiffies! g31129 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:25920 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5328 [inline]
 __schedule+0x184f/0x4c30 kernel/sched/core.c:6690
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6782
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>