rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P16592
rcu: (detected by 1, t=10502 jiffies, g=66825, q=1312 ncpus=2)
task:syz.6.4413 state:R running task stack:25880 pid:16592 tgid:16591 ppid:15497 task_flags:0x400140 flags:0x00080000
Call Trace:
sched_show_task+0x4aa/0x5f0 kernel/sched/core.c:8139
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:__local_bh_enable_ip+0x1c2/0x2b0 kernel/softirq.c:307
Code: f7 89 df e8 60 01 00 00 41 f7 c4 00 02 00 00 74 05 e8 12 fc 44 00 9c 58 a9 00 02 00 00 75 23 41 f7 c4 00 02 00 00 74 01 fb 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 90 0f 0b 90 e9 66 fe
RSP: 0018:ffffc9000461f8d0 EFLAGS: 00000206
RAX: 0000000000000006 RBX: ffff88802e5218a8 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8d6548df RDI: ffffffff8ba85ee0
RBP: 1ffff11005ca417c R08: ffffffff8f8d60f7 R09: 1ffffffff1f1ac1e
R10: dffffc0000000000 R11: fffffbfff1f1ac1f R12: 0000000000000286
R13: dffffc0000000000 R14: ffff88802e520be4 R15: 0000000000000001
local_bh_enable include/linux/bottom_half.h:33 [inline]
bpf_test_run+0x3a8/0x830 net/bpf/test_run.c:426
bpf_prog_test_run_skb+0xe2c/0x2260 net/bpf/test_run.c:1192
bpf_prog_test_run+0x2cd/0x340 kernel/bpf/syscall.c:4742
__sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6266
__do_sys_bpf kernel/bpf/syscall.c:6361 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6359 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6359
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: 0033:0x7f4adc99cdd9
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:00007f4adabee028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f4adcc15fa0 RCX: 00007f4adc99cdd9
RDX: 0000000000000050 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007f4adca32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4adcc16038 R14: 00007f4adcc15fa0 R15: 00007fffbf213b58
rcu: rcu_preempt kthread timer wakeup didn't happen for 10450 jiffies! g66825 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=47442
rcu: rcu_preempt kthread starved for 10451 jiffies! g66825 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27032 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x169e/0x54f0 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7282
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:
CPU: 1 UID: 0 PID: 16592 Comm: syz.6.4413 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:__local_bh_enable_ip+0x1c2/0x2b0 kernel/softirq.c:307
Code: f7 89 df e8 60 01 00 00 41 f7 c4 00 02 00 00 74 05 e8 12 fc 44 00 9c 58 a9 00 02 00 00 75 23 41 f7 c4 00 02 00 00 74 01 fb 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 90 0f 0b 90 e9 66 fe
RSP: 0018:ffffc9000461f8d0 EFLAGS: 00000206
RAX: 0000000000000006 RBX: ffff88802e5218a8 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8d6548df RDI: ffffffff8ba85ee0
RBP: 1ffff11005ca417c R08: ffffffff8f8d60f7 R09: 1ffffffff1f1ac1e
R10: dffffc0000000000 R11: fffffbfff1f1ac1f R12: 0000000000000286
R13: dffffc0000000000 R14: ffff88802e520be4 R15: 0000000000000001
FS: 00007f4adabee6c0(0000) GS:ffff888125fb0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffed1473048 CR3: 0000000035010000 CR4: 00000000003526f0
Call Trace:
local_bh_enable include/linux/bottom_half.h:33 [inline]
bpf_test_run+0x3a8/0x830 net/bpf/test_run.c:426
bpf_prog_test_run_skb+0xe2c/0x2260 net/bpf/test_run.c:1192
bpf_prog_test_run+0x2cd/0x340 kernel/bpf/syscall.c:4742
__sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6266
__do_sys_bpf kernel/bpf/syscall.c:6361 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6359 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6359
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: 0033:0x7f4adc99cdd9
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:00007f4adabee028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f4adcc15fa0 RCX: 00007f4adc99cdd9
RDX: 0000000000000050 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007f4adca32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4adcc16038 R14: 00007f4adcc15fa0 R15: 00007fffbf213b58