rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P14526/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=61753, q=261 ncpus=2)
task:syz.5.2188 state:R running task stack:25824 pid:14526 tgid:14525 ppid:8966 task_flags:0x400140 flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5253 [inline]
__schedule+0x11c9/0x5de0 kernel/sched/core.c:6861
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7188
irqentry_exit+0x36/0x90 kernel/entry/common.c:211
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__orc_find+0x3d/0xf0 arch/x86/kernel/unwind_orc.c:104
Code: 53 48 83 ec 08 85 d2 0f 84 99 00 00 00 49 89 fe 48 89 f0 49 39 fc 72 7b 48 b9 00 00 00 00 00 fc ff df 49 89 ff 48 89 fd eb 0c <48> 8d 6b 04 49 89 df 49 39 ec 72 4e 4c 89 e2 48 29 ea 48 89 d6 48
RSP: 0018:ffffc9000ff06c28 EFLAGS: 00000212
RAX: ffffffff911d2c62 RBX: ffffffff909a2360 RCX: dffffc0000000000
RDX: ffffffff816c351a RSI: 0000000000000000 RDI: ffffffff909a2360
RBP: ffffffff909a2360 R08: ffffffff911d2c68 R09: 00000000accd7842
R10: ffff888047d3aff0 R11: 0000000000006c37 R12: ffffffff909a2360
R13: ffffffff816c37a3 R14: ffffffff909a2360 R15: ffffffff909a2360
orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
unwind_next_frame+0x2ec/0x20a0 arch/x86/kernel/unwind_orc.c:494
__unwind_start+0x45f/0x7f0 arch/x86/kernel/unwind_orc.c:758
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0x73/0x100 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x160/0x1f0 mm/page_owner.c:156
__set_page_owner+0x91/0x560 mm/page_owner.c:332
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1845
prep_new_page mm/page_alloc.c:1853 [inline]
get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3879
__alloc_frozen_pages_noprof+0x25f/0x2440 mm/page_alloc.c:5178
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
folio_alloc_mpol_noprof+0x36/0xe0 mm/mempolicy.c:2435
shmem_alloc_folio+0x135/0x160 mm/shmem.c:1870
shmem_alloc_and_add_folio+0x494/0xc20 mm/shmem.c:1912
shmem_get_folio_gfp+0x67f/0x1610 mm/shmem.c:2535
shmem_fault+0x1fe/0xa00 mm/shmem.c:2736
__do_fault+0x10d/0x490 mm/memory.c:5281
do_read_fault mm/memory.c:5716 [inline]
do_fault mm/memory.c:5850 [inline]
do_pte_missing+0xfb2/0x4000 mm/memory.c:4362
handle_pte_fault mm/memory.c:6195 [inline]
__handle_mm_fault+0x14ca/0x2a30 mm/memory.c:6336
handle_mm_fault+0x3fe/0xad0 mm/memory.c:6505
faultin_page mm/gup.c:1126 [inline]
__get_user_pages+0x605/0x33c0 mm/gup.c:1428
populate_vma_page_range+0x267/0x3f0 mm/gup.c:1860
__mm_populate+0x1d8/0x380 mm/gup.c:1963
mm_populate include/linux/mm.h:3480 [inline]
vm_mmap_pgoff+0x37f/0x470 mm/util.c:586
ksys_mmap_pgoff+0x7d/0x5c0 mm/mmap.c:604
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
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: 0033:0x7f10e678f749
RSP: 002b:00007f10e7676038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f10e69e5fa0 RCX: 00007f10e678f749
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f10e6813f91 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f10e69e6038 R14: 00007f10e69e5fa0 R15: 00007fff54c57978
rcu: rcu_preempt kthread starved for 10560 jiffies! g61753 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:27848 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5253 [inline]
__schedule+0x11c9/0x5de0 kernel/sched/core.c:6861
__schedule_loop kernel/sched/core.c:6943 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6958
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+0x855/0xa50 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: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:_static_cpu_has arch/x86/include/asm/cpufeature.h:101 [inline]
RIP: 0010:addr_has_metadata mm/kasan/kasan.h:334 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:188 [inline]
RIP: 0010:kasan_check_range+0x32/0x1b0 mm/kasan/generic.c:200
Code: 84 64 01 00 00 48 89 f8 41 54 44 0f b6 c2 48 01 f0 55 53 0f 82 d7 00 00 00 eb 0f cc cc cc 48 b8 00 00 00 00 00 00 00 ff eb 0a <48> b8 00 00 00 00 00 80 ff ff 48 39 c7 0f 82 b3 00 00 00 4c 8d 54
RSP: 0018:ffffc90000a08de0 EFLAGS: 00000286
RAX: ffffffff908599d8 RBX: ffff8880b8528380 RCX: ffffffff81a9db49
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff908599d0
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000007
R10: 0000000000000001 R11: 00000000fb268dbe R12: ffff8880b8528100
R13: 0000000000000001 R14: ffff888144f33418 R15: ffffffff875ab8f0
FS: 0000000000000000(0000) GS:ffff888124aa3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f394dbdbf98 CR3: 000000000e184000 CR4: 00000000003526f0
Call Trace:
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
cpumask_test_cpu include/linux/cpumask.h:646 [inline]
cpu_online include/linux/cpumask.h:1205 [inline]
trace_hrtimer_expire_entry include/trace/events/timer.h:259 [inline]
__run_hrtimer kernel/time/hrtimer.c:1774 [inline]
__hrtimer_run_queues+0x5d9/0xc40 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
handle_softirqs+0x219/0x8b0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1055 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1055
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: e5 76 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 53 56 2c 00 fb f4 8c 27 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: 00000000032b3a3d RBX: 0000000000000001 RCX: ffffffff8b5df429
RDX: 0000000000000000 RSI: ffffffff8daa1838 RDI: ffffffff8bf1b880
RBP: ffffed1003adf498 R08: 0000000000000001 R09: ffffed10170a66e5
R10: ffff8880b853372b R11: 00000000ffffffff R12: 0000000000000001
R13: ffff88801d6fa4c0 R14: ffffffff908599d0 R15: 0000000000000000
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:190 [inline]
do_idle+0x38d/0x500 kernel/sched/idle.c:330
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x148