rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12395
rcu: 	(detected by 0, t=10502 jiffies, g=51381, q=315 ncpus=2)
task:syz.1.1932      state:R  running task     stack:26856 pid:12395 tgid:12394 ppid:5814   task_flags:0x400140 flags:0x00080000
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:7819 [inline]
 sched_show_task+0x423/0x630 kernel/sched/core.c:7794
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
 print_other_cpu_stall kernel/rcu/tree_stall.h:681 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:856 [inline]
 rcu_pending kernel/rcu/tree.c:3667 [inline]
 rcu_sched_clock_irq+0x2634/0x31f0 kernel/rcu/tree.c:2704
 update_process_times+0x178/0x2d0 kernel/time/timer.c:2474
 tick_sched_handle kernel/time/tick-sched.c:298 [inline]
 tick_nohz_handler+0x506/0x720 kernel/time/tick-sched.c:319
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x64e/0xc40 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x3c0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_rnp_online_cpus kernel/rcu/tree.c:3985 [inline]
RIP: 0010:rcu_rdp_cpu_online kernel/rcu/tree.c:3995 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0xcd/0x150 kernel/rcu/tree.c:4036
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 75 76 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 20 48 8d 7b 70 48 89 fa 48 c1 ea 03 80 3c 02 00 <75> 5e 48 8b 53 70 b8 01 00 00 00 48 85 d5 74 10 65 ff 0d cc 99 0f
RSP: 0018:ffffc9000c4079b0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffffff8e3d4680 RCX: ffffc90004ed2000
RDX: 1ffffffff1c7a8de RSI: ffffffff8bf2b380 RDI: ffffffff8e3d46f0
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: ffff8880581a2ff0 R12: ffff88814129a000
R13: 0000000000000002 R14: ffffc9000c407b7a R15: ffff8880581a24c0
 rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
 rcu_read_lock_sched_held+0x29/0x70 kernel/rcu/update.c:124
 task_css_set include/linux/cgroup.h:447 [inline]
 task_dfl_cgroup include/linux/cgroup.h:516 [inline]
 ____bpf_get_current_cgroup_id kernel/bpf/helpers.c:412 [inline]
 bpf_get_current_cgroup_id+0x269/0x3b0 kernel/bpf/helpers.c:406
 bpf_prog_ce3dfd7f9330a559+0x23/0x29
 bpf_dispatcher_nop_func include/linux/bpf.h:1378 [inline]
 __bpf_prog_run include/linux/filter.h:723 [inline]
 bpf_prog_run include/linux/filter.h:730 [inline]
 bpf_prog_run_pin_on_cpu include/linux/filter.h:747 [inline]
 bpf_flow_dissect+0x21b/0x740 net/core/flow_dissector.c:1024
 bpf_prog_test_run_flow_dissector+0x438/0x980 net/bpf/test_run.c:1482
 bpf_prog_test_run kernel/bpf/syscall.c:4703 [inline]
 __sys_bpf+0x1035/0x4980 kernel/bpf/syscall.c:6182
 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
 __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:6272
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7bd4d8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7bd5bab038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f7bd4fe5fa0 RCX: 00007f7bd4d8f749
RDX: 0000000000000050 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007f7bd4e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7bd4fe6038 R14: 00007f7bd4fe5fa0 R15: 00007ffef39bb858
 </TASK>
rcu: rcu_preempt kthread starved for 10545 jiffies! g51381 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:28064 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: a6 5f 02 c3 cc cc cc cc 0f 1f 00 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 13 19 12 00 fb f4 <e9> cc 35 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197de8 EFLAGS: 000002c6
RAX: 000000000157a1a9 RBX: 0000000000000001 RCX: ffffffff8b7846d9
RDX: 0000000000000000 RSI: ffffffff8daceab2 RDI: ffffffff8bf2b400
RBP: ffffed1003b56498 R08: 0000000000000001 R09: ffffed10170a673d
R10: ffff8880b85339eb R11: ffff88801dab2ff0 R12: 0000000000000001
R13: ffff88801dab24c0 R14: ffffffff9088bdd0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881249f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3fc506 CR3: 000000002a959000 CR4: 00000000003526f0
DR0: 0000000000000046 DR1: 0000000000000007 DR2: 0000000000000088
DR3: 0000000000000005 DR6: 00000000ffff0ff0 DR7: 0000000000000400
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+0x6c/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x38d/0x510 kernel/sched/idle.c:332
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x148
 </TASK>