rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7966/1:b.el
rcu: 	(detected by 1, t=10502 jiffies, g=24089, q=2784 ncpus=2)
task:syz.3.896       state:R  running task     stack:23544 pid:7966  tgid:7965  ppid:5830   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1850/0x4c30 kernel/sched/core.c:6756
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7078
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unit_alloc+0x2ca/0x360 kernel/bpf/memalloc.c:818
Code: 89 ec e8 19 c7 d6 ff e9 66 fe ff ff e8 0f c7 d6 ff e8 8a ff 03 0a 4d 85 ed 74 dd e8 00 c7 d6 ff fb 48 c7 44 24 20 0e 36 e0 45 <48> 8b 44 24 18 49 c7 04 04 00 00 00 00 66 41 c7 44 04 09 00 00 41
RSP: 0018:ffffc9000c697980 EFLAGS: 00000246
RAX: ffffffff81c8bb70 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000d56a000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000c697a60 R08: ffffffff81c8bb39 R09: 1ffffffff2034b1e
R10: dffffc0000000000 R11: fffffbfff2034b1f R12: dffffc0000000000
R13: 0000000000000200 R14: ffffe8ffffc41250 R15: 0000000000000046
 bpf_mem_cache_alloc+0x83/0xb0 kernel/bpf/memalloc.c:943
 lpm_trie_node_alloc kernel/bpf/lpm_trie.c:299 [inline]
 trie_update_elem+0xc1/0xc20 kernel/bpf/lpm_trie.c:348
 bpf_map_update_value+0x533/0x5c0 kernel/bpf/syscall.c:289
 generic_map_update_batch+0x60d/0x900 kernel/bpf/syscall.c:1950
 bpf_map_do_batch+0x39a/0x660 kernel/bpf/syscall.c:5298
 __sys_bpf+0x377/0x810
 __do_sys_bpf kernel/bpf/syscall.c:5897 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5895 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5895
 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: 0033:0x7fb908985d29
RSP: 002b:00007fb909709038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fb908b75fa0 RCX: 00007fb908985d29
RDX: 0000000000000038 RSI: 0000000020000000 RDI: 000000000000001a
RBP: 00007fb908a01b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb908b75fa0 R15: 00007ffdd77e07f8
 </TASK>
rcu: rcu_preempt kthread starved for 3358 jiffies! g24089 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:25360 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1850/0x4c30 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
 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>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 11 Comm: kworker/u8:0 Not tainted 6.13.0-rc7-syzkaller-01131-g8d20dcda404d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x19fc/0x2c60 kernel/smp.c:884
Code: 01 31 ff e8 c6 e6 0b 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 71 e2 0b 00 eb 38 f3 90 42 0f b6 04 23 84 c0 75 11 <41> f7 45 00 01 00 00 00 74 1e e8 55 e2 0b 00 eb e4 44 89 e9 80 e1
RSP: 0018:ffffc900001076e0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff110170c8c81 RCX: ffff88801c283c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900001078e0 R08: ffffffff81939fea R09: 1ffffffff2858310
R10: dffffc0000000000 R11: fffffbfff2858311 R12: dffffc0000000000
R13: ffff8880b8646408 R14: ffff8880b873fa80 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b17d2bd324 CR3: 000000000e736000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1051
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:2114 [inline]
 text_poke_bp_batch+0x726/0xb30 arch/x86/kernel/alternative.c:2386
 text_poke_flush arch/x86/kernel/alternative.c:2515 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2522
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xbc/0x260 mm/kfence/core.c:849
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317
 worker_thread+0x870/0xd30 kernel/workqueue.c:3398
 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>