rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P24984/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=155729, q=858 ncpus=2)
task:syz.5.4685 state:R running task stack:24600 pid:24984 tgid:24984 ppid:9353 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7513
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
irqentry_exit+0x14f/0x760 kernel/entry/common.c:164
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:81 [inline]
RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:103 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:238 [inline]
RIP: 0010:unwind_next_frame+0x50e/0x2550 arch/x86/kernel/unwind_orc.c:510
Code: c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49
RSP: 0000:ffffc9000585f358 EFLAGS: 00000212
RAX: 0000000000000000 RBX: ffffffff9051c424 RCX: dffffc0000000000
RDX: ffffffff9051c410 RSI: ffffffff90d1d15a RDI: ffffffff8c28af00
RBP: ffffffff9051c410 R08: 000000000000000d R09: ffffffff8e95cd60
R10: dffffc0000000000 R11: ffffffff81b0ebd0 R12: ffffffff82228080
R13: ffffffff9051c410 R14: ffffc9000585f428 R15: ffffffff9051c418
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:165
__set_page_owner+0x8d/0x4c0 mm/page_owner.c:341
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1858
prep_new_page mm/page_alloc.c:1866 [inline]
get_page_from_freelist+0x24ba/0x2540 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226
alloc_pages_mpol+0x235/0x490 mm/mempolicy.c:2490
alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline]
alloc_pages_noprof+0xac/0x2a0 mm/mempolicy.c:2581
pagetable_alloc_noprof include/linux/mm.h:3651 [inline]
__pte_alloc_one_noprof include/asm-generic/pgalloc.h:76 [inline]
pte_alloc_one+0x22/0x370 arch/x86/mm/pgtable.c:18
do_fault_around mm/memory.c:5845 [inline]
do_read_fault mm/memory.c:5884 [inline]
do_fault mm/memory.c:6027 [inline]
do_pte_missing+0x1214/0x33f0 mm/memory.c:4550
handle_pte_fault mm/memory.c:6411 [inline]
__handle_mm_fault mm/memory.c:6549 [inline]
handle_mm_fault+0x1bd7/0x3170 mm/memory.c:6718
do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7fc508471756
RSP: 002b:00007ffffae4e580 EFLAGS: 00010212
RAX: 000000110c404000 RBX: ffffffff81781ab2 RCX: 0000000000000006
RDX: 0000000000001ab2 RSI: 000000000000206a RDI: 0000000000000040
RBP: 0000000000000000 R08: 00007fc508800000 R09: 00007fc508802000
R10: 0000000081781ab6 R11: 0000000000000001 R12: 00007fc508816038
R13: 0000000000000000 R14: ffffffff817813d8 R15: 00007fc509345720
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g155729 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=70901
rcu: rcu_preempt kthread starved for 10502 jiffies! g155729 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:27544 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 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+0x312/0x11d0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 24981 Comm: syz.1.4682 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:separate_irq_context kernel/locking/lockdep.c:4703 [inline]
RIP: 0010:__lock_acquire+0x735/0x2cf0 kernel/locking/lockdep.c:5221
Code: 0b 00 00 4d 85 ff 0f 84 8e 00 00 00 41 83 ff 31 0f 83 ca 23 00 00 4b 8d 04 bf 4d 89 ec 41 8b 6d 20 48 8b 4c 24 20 8b 44 c1 f8 <31> e8 25 00 60 00 00 0f 95 c1 89 0c 24 31 c9 f7 d8 48 19 c9 48 09
RSP: 0018:ffffc90000a08b18 EFLAGS: 00000087
RAX: 0000000000040038 RBX: 4b63bc326e2f4911 RCX: ffff88802b7fc910
RDX: 0000000000000008 RSI: ffff88802b7fc988 RDI: ffff88802b7fbd80
RBP: 00000000000c4d66 R08: ffffffff89b86c54 R09: ffff88803669f2c0
R10: dffffc0000000000 R11: ffffffff89b86ba0 R12: ffff88802b7fc988
R13: ffff88802b7fc988 R14: ffff88802b7fbd80 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff88812538d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f18fe81eba0 CR3: 0000000075bd1000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
__raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158
spin_lock include/linux/spinlock.h:342 [inline]
advance_sched+0xb4/0xc20 net/sched/sch_taprio.c:930
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x3c0/0xa20 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x44b/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: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_cmp8+0x8/0x90 kernel/kcov.c:321
Code: 89 44 11 20 e9 74 7a 4a ff cc 0f 1f 84 00 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 0d 48 69 73 11 65 8b 15 69 69 73 11 81 e2 00 01 ff 00 74
RSP: 0018:ffffc9000478f2f8 EFLAGS: 00000246
RAX: ffffffff821e2436 RBX: ffffea000559c540 RCX: 1ffffd4000ab38ab
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffea000559c547 R09: 1ffffd4000ab38a8
R10: dffffc0000000000 R11: fffff94000ab38a9 R12: ffffea000559c540
R13: ffffea000559c540 R14: 0000000000000000 R15: ffffea000559c570
folio_test_anon include/linux/page-flags.h:718 [inline]
__folio_rmap_sanity_checks include/linux/rmap.h:391 [inline]
__folio_remove_rmap mm/rmap.c:1784 [inline]
folio_remove_rmap_ptes+0x1c6/0xe70 mm/rmap.c:1900
zap_present_folio_ptes mm/memory.c:1656 [inline]
zap_present_ptes mm/memory.c:1714 [inline]
do_zap_pte_range mm/memory.c:1816 [inline]
zap_pte_range mm/memory.c:1918 [inline]
zap_pmd_range mm/memory.c:2004 [inline]
zap_pud_range mm/memory.c:2032 [inline]
zap_p4d_range mm/memory.c:2053 [inline]
__zap_vma_range+0x20c4/0x4b40 mm/memory.c:2093
unmap_vmas+0x379/0x530 mm/memory.c:2162
exit_mmap+0x280/0x9e0 mm/mmap.c:1300
__mmput+0x118/0x430 kernel/fork.c:1178
exit_mm+0x18e/0x250 kernel/exit.c:581
do_exit+0x6a2/0x22c0 kernel/exit.c:963
do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
get_signal+0x1284/0x1330 kernel/signal.c:3037
arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x8c/0x4d0 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3fe579ce59
Code: Unable to access opcode bytes at 0x7f3fe579ce2f.
RSP: 002b:00007f3fe65a70e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f3fe5a16278 RCX: 00007f3fe579ce59
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f3fe5a16278
RBP: 00007f3fe5a16270 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3fe5a16308 R14: 00007ffded147c10 R15: 00007ffded147cf8