rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=7564/1/0x4000000000000000 softirq=209045/209045 fqs=0
rcu: (detected by 1, t=10502 jiffies, g=215633, q=249 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1498 Comm: syz.1.7262 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:arch_atomic64_read arch/x86/include/asm/atomic64_64.h:15 [inline]
RIP: 0010:raw_atomic64_read include/linux/atomic/atomic-arch-fallback.h:2583 [inline]
RIP: 0010:atomic64_read include/linux/atomic/atomic-instrumented.h:1611 [inline]
RIP: 0010:taprio_set_budgets+0x144/0x310 net/sched/sch_taprio.c:676
Code: e8 03 48 89 44 24 28 e9 c1 00 00 00 e8 05 1f 6d f8 48 8b 7c 24 20 be 08 00 00 00 e8 46 e2 da f8 48 8b 44 24 28 42 80 3c 38 00 <0f> 85 6f 01 00 00 48 8b 44 24 18 4c 63 64 24 08 4c 8b 70 20 49 83
RSP: 0018:ffffc90000007d68 EFLAGS: 00000046
RAX: 1ffff11005734854 RBX: ffff88807e741880 RCX: ffffffff899b91aa
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88802b9a42a0
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1005734854
R10: ffff88802b9a42a7 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88807e741800 R14: 0000000000000030 R15: dffffc0000000000
FS: 00007fc5ef08e6c0(0000) GS:ffff88812436d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f780844f0d7 CR3: 00000000860fe000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
advance_sched+0x66e/0xd20 net/sched/sch_taprio.c:984
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x470/0xa00 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 46 a2 56 f6 48 89 df e8 1e f2 56 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 a5 bb 46 f6 65 8b 05 1e 3f 7d 08 85 c0 74 16 5b
RSP: 0018:ffffc900066e7368 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff88801ce84298 RCX: 0000000000000040
RDX: 0000000000000000 RSI: ffffffff8df22fb5 RDI: ffffffff8c1c4180
RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 000000000000001f
R13: dffffc0000000000 R14: ffff8880b8433e70 R15: ffff8880b8433f70
spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
lruvec_unlock_irqrestore include/linux/memcontrol.h:1492 [inline]
folio_batch_move_lru+0x300/0x7d0 mm/swap.c:178
__folio_batch_add_and_move+0x348/0xc60 mm/swap.c:196
shmem_alloc_and_add_folio+0x72a/0xd40 mm/shmem.c:2034
shmem_get_folio_gfp+0x6ab/0x1900 mm/shmem.c:2564
shmem_fault+0x1f9/0xa20 mm/shmem.c:2765
__do_fault+0x10b/0x440 mm/memory.c:5474
do_read_fault mm/memory.c:5909 [inline]
do_fault+0xa99/0x1750 mm/memory.c:6043
do_pte_missing mm/memory.c:4566 [inline]
handle_pte_fault mm/memory.c:6427 [inline]
__handle_mm_fault+0x187d/0x2a00 mm/memory.c:6565
handle_mm_fault+0x36d/0xa20 mm/memory.c:6734
faultin_page mm/gup.c:1126 [inline]
__get_user_pages+0x1178/0x32a0 mm/gup.c:1428
populate_vma_page_range+0x267/0x3f0 mm/gup.c:1860
__mm_populate+0x107/0x3a0 mm/gup.c:1963
mm_populate include/linux/mm.h:4137 [inline]
vm_mmap_pgoff+0x37f/0x470 mm/util.c:586
ksys_mmap_pgoff+0xe4/0x610 mm/mmap.c:606
__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+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc5ee19ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc5ef08e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fc5ee416180 RCX: 00007fc5ee19ce59
RDX: 0000000000000003 RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007fc5ee232d6f R08: ffffffffffffffff R09: 0000000000004000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc5ee416218 R14: 00007fc5ee416180 R15: 00007ffdfb43d0a8
rcu: rcu_preempt kthread starved for 10502 jiffies! g215633 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:28904 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1295/0x67a0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7283
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 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 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:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: 76 92 02 e9 c3 42 03 00 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 63 81 20 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197df0 EFLAGS: 00000246
RAX: 00000000082d9e21 RBX: ffff88801e2c2500 RCX: ffffffff8b8b1095
RDX: 0000000000000000 RSI: ffffffff8df22fb5 RDI: ffffffff8c1c4180
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10170a67b5
R10: ffff8880b8533dab R11: 0000000000000000 R12: 0000000000000001
R13: ffffed1003c584a0 R14: 0000000000000001 R15: ffffffff90d7d650
FS: 0000000000000000(0000) GS:ffff88812446d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f416901c51d CR3: 0000000026af4000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline]
default_idle+0x9/0x10 arch/x86/kernel/process.c:767
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x464/0x590 kernel/sched/idle.c:352
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:451
start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x148