rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=e454/1/0x4000000000000000 softirq=27453/27458 fqs=1
rcu: (detected by 1, t=10502 jiffies, g=20097, q=137 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7660 Comm: syz.4.305 Not tainted 6.16.0-next-20250731-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:_raw_spin_lock_irq+0xb6/0xf0 kernel/locking/spinlock.c:171
Code: f6 31 d2 31 c9 41 b8 01 00 00 00 45 31 c9 ff 75 08 e8 ee 9d 23 f6 48 83 c4 08 48 89 df e8 42 42 24 f6 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 65 48 8b 05 3a 12 24 07 48 3b 44 24 50 75
RSP: 0000:ffffc90000007ca0 EFLAGS: 00000046
RAX: 9355aa160228c100 RBX: ffff8880b8627a80 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000007c20
RBP: ffffc90000007d30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f84 R12: ffff88805780b340
R13: dffffc0000000000 R14: 1ffff92000000f94 R15: dffffc0000000000
FS: 0000555555621500(0000) GS:ffff888125c43000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3141fff8 CR3: 0000000060e04000 CR4: 00000000003526f0
Call Trace:
<IRQ>
__run_hrtimer kernel/time/hrtimer.c:1765 [inline]
__hrtimer_run_queues+0x602/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5893
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 8b 60 00 11 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0000:ffffc90003da77d8 EFLAGS: 00000206
RAX: 9355aa160228c100 RBX: 0000000000000283 RCX: 9355aa160228c100
RDX: 0000000000000001 RSI: ffffffff8db7a779 RDI: ffffffff8be34100
RBP: ffff8880303a8b18 R08: 0000000000000000 R09: ffffffff822b8bea
R10: dffffc0000000000 R11: ffffed1003acc75c R12: 0000000000000001
R13: 0000000000000001 R14: ffff8880b863b3c0 R15: ffff8880303a8000
local_lock_release include/linux/local_lock_internal.h:54 [inline]
consume_stock mm/memcontrol.c:1820 [inline]
try_charge_memcg+0x581/0x1290 mm/memcontrol.c:2314
obj_cgroup_charge_pages mm/memcontrol.c:2800 [inline]
__memcg_kmem_charge_page+0xe1/0x240 mm/memcontrol.c:2844
__alloc_frozen_pages_noprof+0x1b5/0x370 mm/page_alloc.c:5165
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2507
pagetable_alloc_noprof include/linux/mm.h:2904 [inline]
__pte_alloc_one_noprof include/asm-generic/pgalloc.h:75 [inline]
pte_alloc_one+0x21/0x170 arch/x86/mm/pgtable.c:18
__do_fault+0xd1/0x390 mm/memory.c:5147
do_shared_fault mm/memory.c:5637 [inline]
do_fault mm/memory.c:5711 [inline]
do_pte_missing mm/memory.c:4234 [inline]
handle_pte_fault mm/memory.c:6052 [inline]
__handle_mm_fault+0x1847/0x5440 mm/memory.c:6195
handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364
do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f9e92c6ecfa
Code: 01 4c 89 44 24 10 4c 89 54 24 08 e8 50 7d fe ff 48 8b 43 38 4c 8b 44 24 10 83 43 28 08 4c 8b 54 24 08 48 8d 48 f8 48 89 4b 38 <48> 89 68 f8 45 3b 78 04 0f 82 5e fe ff ff e9 ed fe ff ff 0f 1f 00
RSP: 002b:00007ffea2240070 EFLAGS: 00010202
RAX: 0000001b31420000 RBX: 00007f9e93ae5720 RCX: 0000001b3141fff8
RDX: 00000000005ffde8 RSI: 00000000005ffde8 RDI: 00007f9e93ae5700
RBP: ffffffff81afcad7 R08: 00007f9e92fb6038 R09: 00007f9e92fa2000
R10: 00007f9e923ff008 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffffffff81afc3bd R15: 0000000000000001
</TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g20097 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:27448 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 5510 Comm: dhcpcd Not tainted 6.16.0-next-20250731-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 b6 62 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 61 5e 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 45 5e
RSP: 0000:ffffc90003b67720 EFLAGS: 00000293
RAX: ffffffff81b454fb RBX: 1ffff110170c8339 RCX: ffff888026f69e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003b678a0 R08: ffffffff8fa21837 R09: 1ffffffff1f44306
R10: dffffc0000000000 R11: fffffbfff1f44307 R12: ffff8880b86419c8
R13: dffffc0000000000 R14: ffff8880b873b180 R15: 0000000000000000
FS: 00007f2f71524740(0000) GS:ffff888125d43000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005642e27a9048 CR3: 000000003090e000 CR4: 00000000003526f0
Call Trace:
<TASK>
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1044
__flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
flush_tlb_mm_range+0x6b1/0x12d0 arch/x86/mm/tlb.c:1451
flush_tlb_page arch/x86/include/asm/tlbflush.h:324 [inline]
ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:101
wp_page_copy mm/memory.c:3618 [inline]
do_wp_page+0x1bc2/0x5800 mm/memory.c:4013
handle_pte_fault mm/memory.c:6068 [inline]
__handle_mm_fault+0x1033/0x5440 mm/memory.c:6195
handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364
do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f2f715bfd34
Code: 8d 34 19 49 39 d0 49 89 70 60 0f 95 c2 48 29 d8 48 83 c1 10 0f b6 d2 48 83 c8 01 48 c1 e2 02 48 09 da 48 83 ca 01 48 89 51 f8 <48> 89 46 08 48 89 cf 4c 89 e6 48 89 4c 24 08 e8 18 c7 ff ff 48 8b
RSP: 002b:00007ffeaae6e940 EFLAGS: 00010206
RAX: 0000000000005fc1 RBX: 0000000000000ad0 RCX: 00005642e27a8580
RDX: 0000000000000ad1 RSI: 00005642e27a9040 RDI: 0000000000000000
RBP: ffffffffffffffc0 R08: 00007f2f716f8ac0 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000202 R12: 0000000000000ac0
R13: 0000000000000000 R14: 00000000000000ab R15: 00007f2f716f8b20
</TASK>