rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6207/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=14473, q=1026 ncpus=2)
task:syz.2.70 state:R running task stack:27600 pid:6207 tgid:6205 ppid:5843 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7113
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7137
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__local_bh_enable_ip+0x13e/0x1c0 kernel/softirq.c:457
local_bh_enable include/linux/bottom_half.h:33 [inline]
xdp_test_run_batch net/bpf/test_run.c:368 [inline]
bpf_test_run_xdp_live+0x1868/0x1b10 net/bpf/test_run.c:390
bpf_prog_test_run_xdp+0x75b/0x10e0 net/bpf/test_run.c:1331
bpf_prog_test_run+0x2c4/0x340 kernel/bpf/syscall.c:4673
__sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6152
__do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f434918eec9
RSP: 002b:00007f43473d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f43493e6090 RCX: 00007f434918eec9
RDX: 0000000000000050 RSI: 00002000000008c0 RDI: 000000000000000a
RBP: 00007f4349211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f43493e6128 R14: 00007f43493e6090 R15: 00007ffe59b18488
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g14473 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=6989
rcu: rcu_preempt kthread starved for 10502 jiffies! g14473 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:27320 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
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+0x436/0x7d0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6214 Comm: syz.3.72 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:mark_lock+0x3c/0x190 kernel/locking/lockdep.c:4731
Code: 00 03 00 83 f9 01 bb 09 00 00 00 83 db 00 83 fa 08 0f 45 da bd 01 00 00 00 89 d9 d3 e5 25 ff 1f 00 00 48 0f a3 05 94 44 b6 11 <73> 10 48 69 c0 c8 00 00 00 48 8d 88 30 83 f3 92 eb 48 83 3d fb d3
RSP: 0000:ffffc9000c41f658 EFLAGS: 00000003
RAX: 000000000000006d RBX: 0000000000000008 RCX: 0000000000000008
RDX: 0000000000000008 RSI: ffff88802c688b30 RDI: ffff88802c688000
RBP: 0000000000000100 R08: 0000000000000000 R09: ffffffff81ac490b
R10: dffffc0000000000 R11: ffffed1017104f59 R12: ffffffffffffff02
R13: 0000000000000002 R14: ffff88802c688b30 R15: 0000000000000000
FS: 00007fbcc85016c0(0000) GS:ffff888126373000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31a63fff CR3: 00000000785c2000 CR4: 00000000003526f0
Call Trace:
mark_usage kernel/locking/lockdep.c:4674 [inline]
__lock_acquire+0x6a8/0xd20 kernel/locking/lockdep.c:5191
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162
lock_hrtimer_base kernel/time/hrtimer.c:164 [inline]
hrtimer_try_to_cancel+0x22b/0x420 kernel/time/hrtimer.c:1355
hrtimer_cancel+0x3b/0x50 kernel/time/hrtimer.c:1481
perf_swevent_cancel_hrtimer kernel/events/core.c:11830 [inline]
cpu_clock_event_stop+0xd9/0x130 kernel/events/core.c:11880
__perf_event_overflow+0x57d/0xe40 kernel/events/core.c:10346
perf_swevent_hrtimer+0x3b8/0x500 kernel/events/core.c:11786
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x4dd/0xc60 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
__sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1058
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0033:0x7fbcc758eec9
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:00007fbcc8501038 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fbcc77e5fa0 RCX: 00007fbcc758eec9
RDX: 0000000000000004 RSI: 0000000000002402 RDI: 0000000000000004
RBP: 00007fbcc7611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbcc77e6038 R14: 00007fbcc77e5fa0 R15: 00007fff21116dd8