rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7457/1:b..l P7454/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=20541, q=565 ncpus=2)
task:syz.6.351       state:R  running task     stack:25920 pid:7454  tgid:7453  ppid:6355   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5248 [inline]
 __schedule+0x14bc/0x5000 kernel/sched/core.c:6855
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7182
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:104 [inline]
RIP: 0010:__local_bh_enable_ip+0x135/0x1c0 kernel/softirq.c:457
Code: 8b e8 0f 86 c1 09 65 66 8b 05 1f e7 f0 10 66 85 c0 75 5a bf 01 00 00 00 e8 78 8a 0b 00 e8 13 b1 43 00 fb 65 8b 05 fb e6 f0 10 <85> c0 75 05 e8 92 2e ae ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc9001d06f860 EFLAGS: 00000286
RAX: 0000000080000000 RBX: 0000000000000200 RCX: 862d7b10b2252700
RDX: 0000000000000000 RSI: ffffffff8d768032 RDI: ffffffff8bbfc000
RBP: ffffc9001d06f8f0 R08: ffffffff8f802677 R09: 1ffffffff1f004ce
R10: dffffc0000000000 R11: fffffbfff1f004cf R12: ffffffff8968f952
R13: ffffc9001e2d7048 R14: dffffc0000000000 R15: 1ffff92003a0df0c
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 bpf_test_run+0x371/0x7a0 net/bpf/test_run.c:426
 bpf_prog_test_run_xdp+0x795/0x10e0 net/bpf/test_run.c:1322
 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4688
 __sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6167
 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6257 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6257
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f65ae78f749
RSP: 002b:00007f65af681038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f65ae9e5fa0 RCX: 00007f65ae78f749
RDX: 0000000000000050 RSI: 0000200000000780 RDI: 000000000000000a
RBP: 00007f65ae813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f65ae9e6038 R14: 00007f65ae9e5fa0 R15: 00007ffd1f2790a8
 </TASK>
task:syz.5.352       state:R  running task     stack:26792 pid:7457  tgid:7457  ppid:5839   task_flags:0x40004c flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5248 [inline]
 __schedule+0x14bc/0x5000 kernel/sched/core.c:6855
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7039
 preempt_schedule+0xae/0xc0 kernel/sched/core.c:7063
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 zap_pte_range mm/memory.c:1885 [inline]
 zap_pmd_range mm/memory.c:1947 [inline]
 zap_pud_range mm/memory.c:1976 [inline]
 zap_p4d_range mm/memory.c:1997 [inline]
 unmap_page_range+0x3a7f/0x4370 mm/memory.c:2018
 unmap_single_vma mm/memory.c:2061 [inline]
 unmap_vmas+0x399/0x580 mm/memory.c:2105
 exit_mmap+0x23b/0xb20 mm/mmap.c:1280
 __mmput+0x118/0x430 kernel/fork.c:1131
 exit_mm+0x1da/0x2c0 kernel/exit.c:583
 do_exit+0x658/0x2310 kernel/exit.c:961
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1114
 __do_sys_exit_group kernel/exit.c:1125 [inline]
 __se_sys_exit_group kernel/exit.c:1123 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1123
 x64_sys_call+0x2210/0x2210 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4ca098f749
RSP: 002b:00007ffc376f1228 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4ca098f749
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc376f128c R08: 0000000b376f131f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000003b
R13: 00000000000927c0 R14: 0000000000037a38 R15: 00007ffc376f12e0
 </TASK>
rcu: rcu_preempt kthread starved for 10364 jiffies! g20541 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:27392 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5248 [inline]
 __schedule+0x14bc/0x5000 kernel/sched/core.c:6855
 __schedule_loop kernel/sched/core.c:6937 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6952
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: be c3 c9 f5 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 53 cd 21 00 f3 0f 1e fa fb f4 <e9> 93 c3 c9 f5 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6
RAX: c21b333d80d46300 RBX: ffffffff8197247a RCX: c21b333d80d46300
RDX: 0000000000000001 RSI: ffffffff8d768032 RDI: ffffffff8bbfc000
RBP: ffffc90000197f10 R08: ffff8880b893361b R09: 1ffff110171266c3
R10: dffffc0000000000 R11: ffffed10171266c4 R12: ffffffff8f802670
R13: 1ffff110038d9b70 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8881261c0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30d22ff8 CR3: 000000005287b000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1ea/0x520 kernel/sched/idle.c:332
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x147
 </TASK>