rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P38/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=289969, q=263 ncpus=2)
task:khugepaged state:R running task stack:27040 pid:38 tgid:38 ppid:2 task_flags:0x200040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7512
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
irqentry_exit+0x14f/0x730 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:clear_pages arch/x86/include/asm/page_64.h:103 [inline]
RIP: 0010:clear_page arch/x86/include/asm/page_64.h:114 [inline]
RIP: 0010:clear_user_page include/linux/highmem.h:217 [inline]
RIP: 0010:clear_user_highpage include/linux/highmem.h:265 [inline]
RIP: 0010:__collapse_huge_page_copy mm/khugepaged.c:809 [inline]
RIP: 0010:collapse_huge_page mm/khugepaged.c:1218 [inline]
RIP: 0010:collapse_scan_pmd mm/khugepaged.c:1425 [inline]
RIP: 0010:collapse_single_pmd+0x2f2d/0x4550 mm/khugepaged.c:2437
Code: 80 3c 01 00 74 0c 48 c7 c7 00 0f 29 8e e8 1b f3 f9 ff 48 8b 3d f4 f5 f1 0b 48 c1 e3 06 48 29 df 4c 01 ef b9 00 10 00 00 31 c0 aa 0f 1f 44 00 00 e9 a7 00 00 00 e8 c2 b7 8e ff 48 b8 ff ff ff
RSP: 0000:ffffc90000ae7820 EFLAGS: 00010246
RAX: 0000000000000000 RBX: fffa800000000000 RCX: 0000000000000f00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807301f100
RBP: ffffc90000ae7b30 R08: ffff88806fe19fff R09: 1ffff1100dfc33ff
R10: dffffc0000000000 R11: ffffed100dfc3400 R12: 000000000001344d
R13: fffa80007301f000 R14: 00000000000000f8 R15: 0000000000000000
collapse_scan_mm_slot mm/khugepaged.c:2552 [inline]
khugepaged_do_scan mm/khugepaged.c:2632 [inline]
khugepaged+0x921/0x14e0 mm/khugepaged.c:2687
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: rcu_preempt kthread starved for 10491 jiffies! g289969 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:27544 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7282
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:
CPU: 0 UID: 0 PID: 31629 Comm: syz.1.8184 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xfdf/0x13d0 kernel/smp.c:892
Code: 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 a5 f8 0b 00 eb 37 f3 90 43 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 <74> 1e e8 8a f8 0b 00 eb e5 44 89 f1 80 e1 07 80 c1 03 38 c1 7c e3
RSP: 0018:ffffc90006127a00 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff8880b863c148 RCX: 0000000000080000
RDX: ffffc9000ed71000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90006127b40 R08: ffffffff903376f7 R09: 1ffffffff2066ede
R10: dffffc0000000000 R11: fffffbfff2066edf R12: 1ffff110170e8169
R13: dffffc0000000000 R14: ffff8880b8740b48 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888125217000(0063) knlGS:00000000f5444b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000003181cff8 CR3: 00000000565fe000 CR4: 00000000003526f0
DR0: 00000000000006ab DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1057
__flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
flush_tlb_mm_range+0x5c3/0x10b0 arch/x86/mm/tlb.c:1451
tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:509 [inline]
tlb_flush_mmu+0x1af/0xa30 mm/mmu_gather.c:423
tlb_finish_mmu+0xf9/0x230 mm/mmu_gather.c:549
madvise_finish_tlb mm/madvise.c:1834 [inline]
do_madvise+0x246/0x2e0 mm/madvise.c:2023
__do_sys_madvise mm/madvise.c:2031 [inline]
__se_sys_madvise mm/madvise.c:2029 [inline]
__ia32_sys_madvise+0xa6/0xc0 mm/madvise.c:2029
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x229/0x6e0 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7fc801c
Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8
RSP: 002b:00000000f544450c EFLAGS: 00000206 ORIG_RAX: 00000000000000db
RAX: ffffffffffffffda RBX: 0000000080000000 RCX: 0000000000600000
RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000