sched: DL replenish lagged too much
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=b06c/1/0x4000000000000000 softirq=22905/22908 fqs=1
rcu: (detected by 1, t=10502 jiffies, g=16701, q=349 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6644 Comm: modprobe Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:88 [inline]
RIP: 0010:do_raw_spin_lock+0xde/0x2c0 kernel/locking/spinlock_debug.c:115
Code: 1a 92 48 89 4c 24 10 48 39 c8 0f 84 07 01 00 00 4c 8d 6b 08 4d 89 ef 49 c1 ef 03 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 07 <84> c0 0f 85 8c 01 00 00 41 8b 45 00 65 8b 0d f3 16 7d 10 39 c8 0f
RSP: 0018:ffffc90000007ba0 EFLAGS: 00000802
RAX: 0000000000000000 RBX: ffff88807778e2e8 RCX: ffff88801d768000
RDX: 00000000c6c55000 RSI: ffffffff8d4b693d RDI: ffff88807778e2e8
RBP: ffffc90000007c60 R08: ffff88807778e300 R09: ffffffff893c2820
R10: dffffc0000000000 R11: ffffffff893c2760 R12: ffff88807778e2f8
R13: ffff88807778e2f0 R14: 1ffff1100eef1c5f R15: 1ffff1100eef1c5e
FS: 0000000000000000(0000) GS:ffff88812667a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f47cfdc9a10 CR3: 000000003166c000 CR4: 00000000003526f0
Call Trace:
spin_lock include/linux/spinlock.h:351 [inline]
advance_sched+0xc0/0xc80 net/sched/sch_taprio.c:929
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x528/0xc40 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x457/0xa90 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
__sysvec_apic_timer_interrupt+0x107/0x3f0 arch/x86/kernel/apic/apic.c:1058
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:arch_atomic_inc include/linux/instrumented.h:96 [inline]
RIP: 0010:raw_atomic_inc include/linux/atomic/atomic-arch-fallback.h:992 [inline]
RIP: 0010:atomic_inc include/linux/atomic/atomic-instrumented.h:436 [inline]
RIP: 0010:mas_validate_parent_slot lib/maple_tree.c:6985 [inline]
RIP: 0010:mt_validate+0x7c8/0x4380 lib/maple_tree.c:7170
Code: bc 24 38 01 00 00 49 39 de 75 53 4d 39 fc 0f 85 a5 00 00 00 e8 09 84 b2 f6 48 c7 c7 00 cc 68 99 be 04 00 00 00 e8 d8 ae 17 f7 ff 05 c1 80 5c 0e 4c 3b a4 24 38 01 00 00 0f 85 a2 00 00 00 e8
RSP: 0018:ffffc90002f47360 EFLAGS: 00000297
RAX: ffffffff8b0c4b01 RBX: 0000000000000002 RCX: ffffffff8b0c4b38
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff9968cc00
RBP: ffffc90002f47550 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff32d1980 R12: ffff88801d2ed40c
R13: ffff88801d2ec660 R14: 0000000000000002 R15: ffff88801d2ed40c
validate_mm+0xaa/0x490 mm/vma.c:651
vms_complete_munmap_vmas+0x6c3/0x8b0 mm/vma.c:1296
__mmap_complete mm/vma.c:2532 [inline]
__mmap_region mm/vma.c:2678 [inline]
mmap_region+0x1217/0x2410 mm/vma.c:2740
do_mmap+0xc96/0x1140 mm/mmap.c:558
vm_mmap_pgoff+0x2a2/0x4c0 mm/util.c:581
ksys_mmap_pgoff+0x51b/0x760 mm/mmap.c:604
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x86/0x540 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f47d00f6242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffd40312738 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f47cfd64000 RCX: 00007f47d00f6242
RDX: 0000000000000005 RSI: 0000000000037000 RDI: 00007f47cfd64000
RBP: 0000000000000812 R08: 0000000000000000 R09: 0000000000003000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffd40312788
R13: 00007f47cfdcd6b0 R14: 00007ffd40312b70 R15: 00000fffa80624ea
rcu: rcu_preempt kthread starved for 10500 jiffies! g16701 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:27360 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1794/0x4c40 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x161/0x360 kernel/sched/core.c:7026
schedule_timeout+0x127/0x260 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x2fd/0x1520 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:2285
kthread+0x70d/0x890 kernel/kthread.c:463
ret_from_fork+0x4b4/0x840 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: 50 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x33/0x60 kernel/kcov.c:217
Code: 08 60 1a 92 65 8b 15 ec 90 5b 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 84 16 00 00 00 74 2c 8b 91 60 16 00 00 <83> fa 02 75 21 48 8b 91 68 16 00 00 48 8b 32 48 8d 7e 01 8b 89 64
RSP: 0018:ffffc90000bb7618 EFLAGS: 00000246
RAX: ffffffff81b366f3 RBX: 1ffff11017108435 RCX: ffff88801ab00000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000bb77a0 R08: ffffffff8f361877 R09: 1ffffffff1e6c30e
R10: dffffc0000000000 R11: fffffbfff1e6c30f R12: ffff8880b88421a8
R13: dffffc0000000000 R14: ffff8880b893b200 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88812677a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6e4e547000 CR3: 000000000d938000 CR4: 00000000003526f0
Call Trace:
csd_lock_wait kernel/smp.c:342 [inline]
smp_call_function_many_cond+0xd43/0x12a0 kernel/smp.c:877
on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1043
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2713 [inline]
smp_text_poke_batch_finish+0x5f3/0x1120 arch/x86/kernel/alternative.c:2923
arch_jump_label_transform_apply+0x18/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x124/0x240 kernel/jump_label.c:210
static_key_enable+0x16/0x20 kernel/jump_label.c:223
toggle_allocation_gate+0xa9/0x240 mm/kfence/core.c:852
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xadd/0x1780 kernel/workqueue.c:3346
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3427
kthread+0x70d/0x890 kernel/kthread.c:463
ret_from_fork+0x4b4/0x840 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245