rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P9081/4:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=245649, q=1637 ncpus=2)
task:syz-executor    state:R  running task     stack:22536 pid:9081  tgid:9081  ppid:9080   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0x16dc/0x5500 kernel/sched/core.c:7228
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7552
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:arch_atomic_inc include/linux/instrumented.h:112 [inline]
RIP: 0010:raw_atomic_inc include/linux/atomic/atomic-arch-fallback.h:992 [inline]
RIP: 0010:atomic_inc include/linux/atomic/atomic-instrumented.h:436 [inline]
RIP: 0010:__folio_dup_file_rmap include/linux/rmap.h:503 [inline]
RIP: 0010:folio_dup_file_rmap_pte include/linux/rmap.h:544 [inline]
RIP: 0010:copy_present_ptes mm/memory.c:1192 [inline]
RIP: 0010:copy_pte_range mm/memory.c:1320 [inline]
RIP: 0010:copy_pmd_range+0xcea/0x53e0 mm/memory.c:1408
Code: 53 ae ff 49 83 e5 40 0f 85 58 02 00 00 e8 1e 4e ae ff 48 8b 9c 24 98 00 00 00 48 89 df be 04 00 00 00 e8 59 56 17 00 f0 ff 03 <e9> 69 02 00 00 e8 fc 4d ae ff 4c 8b 74 24 20 4d 89 f7 49 c1 ef 03
RSP: 0018:ffffc9000649f340 EFLAGS: 00000202
RAX: ffffffff82169901 RBX: ffffea000254e9b0 RCX: ffffffff82169957
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffea000254e9b0
RBP: ffffc9000649f5f0 R08: ffffea000254e9b3 R09: 1ffffd40004a9d36
R10: dffffc0000000000 R11: fffff940004a9d37 R12: 1ffffd40004a9d30
R13: 0000000000000000 R14: ffffea000254e988 R15: 1ffffd40004a9d31
 copy_pud_range mm/memory.c:1445 [inline]
 copy_p4d_range mm/memory.c:1469 [inline]
 copy_page_range+0xb34/0x1160 mm/memory.c:1555
 dup_mmap+0xf2d/0x1d40 mm/mmap.c:1840
 dup_mm kernel/fork.c:1537 [inline]
 copy_mm+0x11a/0x480 kernel/fork.c:1589
 copy_process+0x1e4f/0x42e0 kernel/fork.c:2287
 kernel_clone+0x2d2/0x8d0 kernel/fork.c:2745
 __do_sys_clone kernel/fork.c:2886 [inline]
 __se_sys_clone kernel/fork.c:2870 [inline]
 __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2870
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f448f7e58d2
RSP: 002b:00007ffef22b5ff0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffef22b5ff0 RCX: 00007f448f7e58d2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffef22b617c R08: 0000000000000000 R09: 0000000000000001
R10: 0000555584f887d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000002267e9 R15: 00007ffef22b61d0
 </TASK>
rcu: rcu_preempt kthread starved for 6149 jiffies! g245649 f0x0 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:28112 pid:18    tgid:18    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0x16dc/0x5500 kernel/sched/core.c:7228
 __schedule_loop kernel/sched/core.c:7307 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7322
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
 kthread+0x388/0x470 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:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: bc 6e 02 e9 83 cb 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 43 a2 2b 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc900001d7e40 EFLAGS: 00000246
RAX: ffff88812625c000 RBX: ffffffff81993350 RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8ba7bb00 RDI: ffffffff81993350
RBP: ffffc900001d7f10 R08: ffff8880b8933d5b R09: 1ffff110171267ab
R10: dffffc0000000000 R11: ffffed10171267ac R12: 0000000000000000
R13: 1ffff11003a50000 R14: 1ffff9200003afd0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88812625c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f82c9991a5f CR3: 000000005cdee000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/kernel/process.c:766 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x2e0/0x540 kernel/sched/idle.c:355
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:454
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x157
 </TASK>