rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P15935/1:b..l
(detected by 1, t=10502 jiffies, g=86261, q=5294 ncpus=2)
task:syz.4.3162 state:R running task stack:24128 pid:15935 ppid:15072 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6562
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6731
preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6755
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0xf6/0x100 kernel/locking/spinlock.c:194
__bpf_ringbuf_reserve+0x452/0x5a0 kernel/bpf/ringbuf.c:453
____bpf_ringbuf_reserve kernel/bpf/ringbuf.c:466 [inline]
bpf_ringbuf_reserve+0x58/0x70 kernel/bpf/ringbuf.c:458
bpf_prog_7b7940c9da0810f3+0x2e/0x76
bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline]
__bpf_prog_run include/linux/filter.h:607 [inline]
bpf_prog_run include/linux/filter.h:614 [inline]
bpf_test_run+0x29e/0x810 net/bpf/test_run.c:402
bpf_prog_test_run_skb+0xa40/0x11b0 net/bpf/test_run.c:1183
bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3695
__sys_bpf+0x593/0x6d0 kernel/bpf/syscall.c:5048
__do_sys_bpf kernel/bpf/syscall.c:5134 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5132 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc210f8f749
RSP: 002b:00007fc211eb3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fc2111e5fa0 RCX: 00007fc210f8f749
RDX: 000000000000004c RSI: 0000200000000240 RDI: 000000000000000a
RBP: 00007fc211013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc2111e6038 R14: 00007fc2111e5fa0 R15: 00007ffc4d2ccb68
rcu: rcu_preempt kthread timer wakeup didn't happen for 10480 jiffies! g86261 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=52886
rcu: rcu_preempt kthread starved for 10481 jiffies! g86261 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
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:27424 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
schedule_timeout+0x15c/0x280 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 15937 Comm: syz.4.3162 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:check_preemption_disabled+0x1/0x110 lib/smp_processor_id.c:13
Code: 20 7a 9c 8c 4c 89 f6 e8 cd c1 1d fa e9 6e ff ff ff 00 00 cc cc 00 00 cc cc 48 c7 c7 60 fe be 8a 48 c7 c6 a0 fe be 8a eb 00 55 <41> 57 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24
RSP: 0018:ffffc90000007aa0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000101
RDX: ffff888067880000 RSI: ffffffff8abefea0 RDI: ffffffff8abefe60
RBP: ffffc90000007bd8 R08: dffffc0000000000 R09: fffffbfff2119649
R10: fffffbfff2119649 R11: 1ffffffff2119648 R12: ffffffff8c97d860
R13: 1ffff92000000f68 R14: ffff888030b6d180 R15: 0000000000000000
FS: 00007fc211e926c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007d983000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
rcu_lockdep_current_cpu_online+0x33/0x120 kernel/rcu/tree.c:768
rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
rcu_read_lock_held+0x1a/0x40 kernel/rcu/update.c:309
bpf_prog_run_array include/linux/bpf.h:1658 [inline]
trace_call_bpf+0x1e2/0x690 kernel/trace/bpf_trace.c:135
perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:9997
perf_trace_preemptirq_template+0x287/0x330 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
RIP: 0010:handle_softirqs+0x1c8/0x920 kernel/softirq.c:584
Code: 89 7c 24 44 0f b7 db 48 c7 c7 00 fc 6a 8a e8 4f b5 c2 08 65 66 c7 05 75 13 b5 7e 00 00 e8 d0 d8 38 00 fb 49 c7 c6 c0 a0 60 8c <89> 5c 24 4c b8 ff ff ff ff 0f bc 44 24 4c 41 89 c5 41 ff c5 0f 84
RSP: 0018:ffffc90000007e00 EFLAGS: 00000286
RAX: 5d4906adeafd0b00 RBX: 0000000000000200 RCX: 5d4906adeafd0b00
RDX: dffffc0000000000 RSI: ffffffff8a6c0600 RDI: ffffffff8abefec0
RBP: ffffc90000007f30 R08: dffffc0000000000 R09: ffffed10171c6b02
R10: ffffed10171c6b02 R11: 1ffff110171c6b01 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff8c60a0c0 R15: 000000000000000a
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:rcu_read_unlock_special+0x3c/0x500 kernel/rcu/tree_plugin.h:630
Code: 81 ec c0 00 00 00 65 48 8b 04 25 28 00 00 00 48 89 84 24 a0 00 00 00 49 bd 00 00 00 00 00 fc ff df 48 c7 44 24 40 b3 8a b5 41 <48> c7 44 24 48 38 ee 1e 8c 48 c7 44 24 50 10 0f 6c 81 48 8d 5c 24
RSP: 0018:ffffc90004fb7820 EFLAGS: 00000282
RAX: 5d4906adeafd0b00 RBX: ffff88806788043c RCX: 0000000000080000
RDX: ffffc9000fdb4000 RSI: 0000000000009d86 RDI: ffff888067880000
RBP: ffffc90004fb7920 R08: dffffc0000000000 R09: ffffed10171c6b02
R10: ffffed10171c6b02 R11: 1ffff110171c6b01 R12: 1ffff1100cf10087
R13: dffffc0000000000 R14: ffff888067880440 R15: dffffc0000000000
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
pcpu_memcg_post_alloc_hook+0x3b9/0x460 mm/percpu.c:1660
pcpu_alloc+0x1225/0x1a10 mm/percpu.c:1891
bpf_prog_alloc_no_stats+0xda/0x3a0 kernel/bpf/core.c:101
bpf_prog_alloc+0x1c/0x1b0 kernel/bpf/core.c:130
bpf_prog_load+0x7b6/0x15a0 kernel/bpf/syscall.c:2597
__sys_bpf+0x520/0x6d0 kernel/bpf/syscall.c:5030
__do_sys_bpf kernel/bpf/syscall.c:5134 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5132 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc210f8f749
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:00007fc211e92038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fc2111e6090 RCX: 00007fc210f8f749
RDX: 0000000000000048 RSI: 0000200000000080 RDI: 0000000000000005
RBP: 00007fc211013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc2111e6128 R14: 00007fc2111e6090 R15: 00007ffc4d2ccb68