rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6853
rcu: (detected by 1, t=10502 jiffies, g=20629, q=625 ncpus=2)
task:syz.2.391 state:R running task stack:25832 pid:6853 tgid:6851 ppid:5609 task_flags:0x400140 flags:0x00080000
Call Trace:
sched_show_task+0x4aa/0x5f0 kernel/sched/core.c:8140
rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
print_other_cpu_stall+0xfca/0x1380 kernel/rcu/tree_stall.h:681
check_cpu_stall kernel/rcu/tree_stall.h:856 [inline]
rcu_pending kernel/rcu/tree.c:3679 [inline]
rcu_sched_clock_irq+0x939/0x1050 kernel/rcu/tree.c:2716
update_process_times+0x234/0x2d0 kernel/time/timer.c:2475
tick_sched_handle kernel/time/tick-sched.c:298 [inline]
tick_nohz_handler+0x42b/0x770 kernel/time/tick-sched.c:319
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x3bc/0xb10 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x455/0x950 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline]
RIP: 0010:__local_bh_disable_ip+0x9c/0x420 kernel/softirq.c:167
Code: c1 ee 03 43 0f b6 04 2e 84 c0 0f 85 66 02 00 00 41 83 3c 24 00 74 04 31 db eb 60 65 8b 05 1c 9d e7 10 a9 ff ff ff 7f 75 0d 9c <58> a9 00 02 00 00 0f 85 9e 00 00 00 48 c7 c0 e0 b3 7a 99 48 c1 e8
RSP: 0018:ffffc9000e0076a8 EFLAGS: 00000246
RAX: 0000000080000000 RBX: ffffffff8187c2bc RCX: 0000000000000046
RDX: 00000000eb870400 RSI: ffffffff8d883145 RDI: ffffffff8ba86060
RBP: 0000000000000200 R08: ffffffff8187c2bc R09: ffffffff8de5f300
R10: ffffc9000e0079a0 R11: fffff52001c00f42 R12: ffff88801df78be4
R13: dffffc0000000000 R14: 1ffff11003bef17c R15: ffff88801df78000
local_bh_disable include/linux/bottom_half.h:20 [inline]
xdp_test_run_batch net/bpf/test_run.c:289 [inline]
bpf_test_run_xdp_live+0x520/0x1cf0 net/bpf/test_run.c:379
bpf_prog_test_run_xdp+0x81c/0x1160 net/bpf/test_run.c:1465
bpf_prog_test_run+0x2cd/0x340 kernel/bpf/syscall.c:4747
__sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6271
__do_sys_bpf kernel/bpf/syscall.c:6366 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6364 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6364
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff7c825cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff7c64ae028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007ff7c84d5fa0 RCX: 00007ff7c825cdd9
RDX: 0000000000000050 RSI: 0000200000000b80 RDI: 000000000000000a
RBP: 00007ff7c82f2d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff7c84d6038 R14: 00007ff7c84d5fa0 R15: 00007ffc9b3e13a8
rcu: rcu_preempt kthread timer wakeup didn't happen for 10437 jiffies! g20629 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=8292
rcu: rcu_preempt kthread starved for 10438 jiffies! g20629 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:27000 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x169e/0x54f0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11b0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
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: 0 Comm: swapper/0 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: ab 65 02 e9 83 c9 03 00 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 03 3b 22 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8dc07dc0 EFLAGS: 00000242
RAX: 000000000009db5b RBX: ffffffff81996b4a RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8d623734 RDI: ffffffff8ba86060
RBP: ffffffff8dc07eb0 R08: ffff8880b8633e9b R09: 1ffff110170c67d3
R10: dffffc0000000000 R11: ffffed10170c67d4 R12: 0000000000000000
R13: 1ffffffff1b9fdd8 R14: 0000000000000000 R15: 1ffffffff1b9fdd8
FS: 0000000000000000(0000) GS:ffff888125f2a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f84a082bd8c CR3: 000000002a61e000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:766 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x36a/0x5f0 kernel/sched/idle.c:352
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:451
rest_init+0x2de/0x300 init/main.c:762
start_kernel+0x38a/0x3e0 init/main.c:1220
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x147
ip6_tunnel: ip6gre1 xmit: Local address not yet configured!