rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P22514
rcu: (detected by 0, t=10503 jiffies, g=127021, q=436 ncpus=2)
task:syz.6.3851 state:R running task stack:26072 pid:22514 tgid:22511 ppid:12858 task_flags:0x400140 flags:0x00080000
Call Trace:
sched_show_task kernel/sched/core.c:7819 [inline]
sched_show_task+0x423/0x630 kernel/sched/core.c:7794
rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
print_other_cpu_stall kernel/rcu/tree_stall.h:681 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:856 [inline]
rcu_pending kernel/rcu/tree.c:3667 [inline]
rcu_sched_clock_irq+0x2634/0x31f0 kernel/rcu/tree.c:2704
update_process_times+0x178/0x2d0 kernel/time/timer.c:2474
tick_sched_handle kernel/time/tick-sched.c:298 [inline]
tick_nohz_handler+0x506/0x720 kernel/time/tick-sched.c:319
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x64e/0xc40 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x3c0 arch/x86/kernel/apic/apic.c:1062
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:strncpy_from_kernel_nofault+0xf7/0x260 mm/maccess.c:97
Code: 00 00 00 e8 db 7f c4 ff 4c 89 f6 4c 89 ef e8 e0 79 c4 ff 4d 39 f5 0f 8d b8 00 00 00 4c 89 fb e8 bf 7f c4 ff 45 31 ed 8a 45 00 <48> b9 00 00 00 00 00 fc ff df 41 89 c4 48 89 d8 48 89 da 48 c1 e8
RSP: 0018:ffffc9000c3df990 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffc9000c3df9f0 RCX: ffffc90021875000
RDX: 0000000000080000 RSI: ffffffff81fa6441 RDI: ffff8880419317d4
RBP: fffffffffffffffe R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffff888041930b30 R12: ffffc9000c3df9f0
R13: fffffffffffffff2 R14: 0000000000000005 R15: fffffffffffffffe
bpf_probe_read_kernel_str_common kernel/trace/bpf_trace.c:264 [inline]
____bpf_probe_read_kernel_str kernel/trace/bpf_trace.c:273 [inline]
bpf_probe_read_kernel_str+0x26/0x70 kernel/trace/bpf_trace.c:270
bpf_prog_bcb72093c703aa45+0x43/0x49
bpf_dispatcher_nop_func include/linux/bpf.h:1376 [inline]
__bpf_prog_run include/linux/filter.h:723 [inline]
bpf_prog_run include/linux/filter.h:730 [inline]
bpf_prog_run_pin_on_cpu include/linux/filter.h:747 [inline]
bpf_flow_dissect+0x21b/0x740 net/core/flow_dissector.c:1024
bpf_prog_test_run_flow_dissector+0x438/0x980 net/bpf/test_run.c:1482
bpf_prog_test_run kernel/bpf/syscall.c:4703 [inline]
__sys_bpf+0x1035/0x4980 kernel/bpf/syscall.c:6182
__do_sys_bpf kernel/bpf/syscall.c:6274 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6272 [inline]
__x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:6272
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffbb678f749
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:00007ffbb75d1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007ffbb69e6090 RCX: 00007ffbb678f749
RDX: 0000000000000050 RSI: 0000200000000240 RDI: 000000000000000a
RBP: 00007ffbb6813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffbb69e6128 R14: 00007ffbb69e6090 R15: 00007ffd7dcffe08
rcu: rcu_preempt kthread starved for 10456 jiffies! g127021 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:28192 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: c6 5f 02 c3 cc cc cc cc 0f 1f 00 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 13 59 12 00 fb f4 cc 35 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197de8 EFLAGS: 000002c6
RAX: 0000000003fb844f RBX: 0000000000000001 RCX: ffffffff8b7806d9
RDX: 0000000000000000 RSI: ffffffff8dacdb2d RDI: ffffffff8bf2b300
RBP: ffffed1003b56498 R08: 0000000000000001 R09: ffffed10170a673d
R10: ffff8880b85339eb R11: ffff88801dab2ff0 R12: 0000000000000001
R13: ffff88801dab24c0 R14: ffffffff9088aed0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881249f6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561e00c6c960 CR3: 0000000081431000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x38d/0x510 kernel/sched/idle.c:332
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x148