rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=989c/1/0x4000000000000000 softirq=31903/31904 fqs=0
rcu: (detected by 0, t=10505 jiffies, g=28485, q=195 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8840 Comm: syz.4.780 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:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x90 kernel/kcov.c:314
Code: 48 89 44 11 20 c3 cc cc cc cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 14 25 08 90 a1 92 65 8b 0d 18 d1 e0 10 81 e1 00 01 ff 00
RSP: 0018:ffffc90000a08d00 EFLAGS: 00000046
RAX: ffffffff81ae5a59 RBX: ffff88805b02b300 RCX: ffff8880263ebc80
RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000020
RBP: 0000000000000010 R08: ffffffff8fa25d77 R09: 1ffffffff1f44bae
R10: dffffc0000000000 R11: fffffbfff1f44baf R12: dffffc0000000000
R13: 1ffff110170e5070 R14: ffff8880b8728380 R15: 0000000000000001
FS: 00007f76a91ff6c0(0000) GS:ffff888125d07000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c36e9b0 CR3: 000000002037e000 CR4: 00000000003526f0
Call Trace:
enqueue_hrtimer+0x129/0x380 kernel/time/hrtimer.c:1084
__run_hrtimer kernel/time/hrtimer.c:1794 [inline]
__hrtimer_run_queues+0x636/0xc30 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
__sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:profile_hit include/linux/profile.h:50 [inline]
RIP: 0010:schedule_debug kernel/sched/core.c:5864 [inline]
RIP: 0010:__schedule+0x2ba/0x5040 kernel/sched/core.c:6770
Code: c0 6d 8a 8b be e5 16 00 00 48 c7 c2 20 77 8a 8b e8 fb d0 3f f6 4c 89 74 24 20 0f 1f 44 00 00 48 c7 c0 10 5f a2 8f 48 c1 e8 03 <48> b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 0f 85 60 18 00 00
RSP: 0018:ffffc90003ebeee0 EFLAGS: 00000a06
RAX: 1ffffffff1f44be2 RBX: ffffc90003eb8000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8db845c0 RDI: ffffffff8be08c60
RBP: ffffc90003ebf0d8 R08: ffffffff8fa25d77 R09: 1ffffffff1f44bae
R10: dffffc0000000000 R11: fffffbfff1f44baf R12: ffff888125d07000
R13: 0000000000000001 R14: ffff8880263ebc80 R15: 1ffff110170e76d0
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7221
irqentry_exit+0x5e3/0x670 kernel/entry/common.c:216
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__page_table_check_zero+0x19b/0x3e0 mm/page_table_check.c:139
Code: 31 e4 48 c7 c0 c0 0a b4 99 48 c1 e8 03 48 89 44 24 18 83 7c 24 04 1f 0f 87 0e 01 00 00 e8 6d 8b 8d ff 4c 89 e7 48 8b 5c 24 20 <48> 89 de e8 bd 8d 8d ff 4c 39 e3 0f 84 51 01 00 00 48 8b 1d 8d 63
RSP: 0018:ffffc90003ebf200 EFLAGS: 00000283
RAX: ffffffff82332f53 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc9001086f000 RSI: 0000000000000912 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff82332e2a R09: ffffffff8e13efa0
R10: dffffc0000000000 R11: ffffed100adc393e R12: 0000000000000000
R13: 000000000004ec76 R14: 1ffffffff1b76aa4 R15: ffff88801d21e490
page_table_check_alloc include/linux/page_table_check.h:35 [inline]
post_alloc_hook+0x250/0x2a0 mm/page_alloc.c:1888
prep_new_page mm/page_alloc.c:1895 [inline]
get_page_from_freelist+0x23a5/0x2440 mm/page_alloc.c:3948
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5257
__alloc_pages_noprof mm/page_alloc.c:5291 [inline]
alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5211
___alloc_pages_bulk mm/kasan/shadow.c:345 [inline]
__kasan_populate_vmalloc_do mm/kasan/shadow.c:370 [inline]
__kasan_populate_vmalloc+0xc1/0x1d0 mm/kasan/shadow.c:424
kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
alloc_vmap_area+0xdc4/0x14e0 mm/vmalloc.c:2129
__get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3224
__vmalloc_node_range_noprof+0x371/0x16a0 mm/vmalloc.c:4016
__vmalloc_node_noprof mm/vmalloc.c:4116 [inline]
__vmalloc_noprof+0xd2/0x120 mm/vmalloc.c:4132
bpf_prog_alloc_no_stats+0x4a/0x500 kernel/bpf/core.c:107
bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:156
bpf_prog_load+0x735/0x1a10 kernel/bpf/syscall.c:2991
__sys_bpf+0x5c3/0x8a0 kernel/bpf/syscall.c:6206
__do_sys_bpf kernel/bpf/syscall.c:6319 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6317 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6317
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f76a838f749
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:00007f76a91ff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f76a85e6180 RCX: 00007f76a838f749
RDX: 0000000000000048 RSI: 00002000000017c0 RDI: 0000000000000005
RBP: 00007f76a8413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f76a85e6218 R14: 00007f76a85e6180 R15: 00007ffc6e2b2b08
rcu: rcu_preempt kthread starved for 10505 jiffies! g28485 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:27096 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5282 [inline]
__schedule+0x14ed/0x5040 kernel/sched/core.c:6894
__schedule_loop kernel/sched/core.c:6976 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6991
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x11b0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9b/0x2d0 kernel/rcu/tree.c:2297
kthread+0x389/0x480 kernel/kthread.c:467
ret_from_fork+0x510/0xa50 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:
CPU: 0 UID: 0 PID: 995 Comm: kworker/u8:6 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xcc5/0x1260 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 94 a3 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 3f 9f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 23 9f
RSP: 0018:ffffc90003b4f760 EFLAGS: 00000293
RAX: ffffffff81b51b9d RBX: 1ffff110170e8181 RCX: ffff8880262f3c80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003b4f8a0 R08: ffffffff8fa25d77 R09: 1ffffffff1f44bae
R10: dffffc0000000000 R11: fffffbfff1f44baf R12: ffff8880b8740c08
R13: dffffc0000000000 R14: ffff8880b863bdc0 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888125c07000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c36e41c CR3: 000000000df38000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline]
smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2921
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:879
process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279
process_scheduled_works kernel/workqueue.c:3362 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443
kthread+0x389/0x480 kernel/kthread.c:467
ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246