sched: DL replenish lagged too much
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6633/1:b.el
rcu: 	(detected by 1, t=11623 jiffies, g=11461, q=1306 ncpus=2)
task:syz.3.42        state:R  running task     stack:26760 pid:6633  tgid:6632  ppid:6346   task_flags:0x40054c flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5366 [inline]
 __schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6926
 preempt_schedule+0xe4/0xf0 kernel/sched/core.c:6950
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 zap_pte_range mm/memory.c:1771 [inline]
 zap_pmd_range mm/memory.c:1833 [inline]
 zap_pud_range mm/memory.c:1862 [inline]
 zap_p4d_range mm/memory.c:1883 [inline]
 unmap_page_range+0x3a12/0x4520 mm/memory.c:1904
 unmap_vmas+0x3ce/0x5f0 mm/memory.c:1994
 exit_mmap+0x2bc/0xdd0 mm/mmap.c:1284
 __mmput+0x115/0x420 kernel/fork.c:1356
 exit_mm+0x221/0x310 kernel/exit.c:586
 do_exit+0x9ad/0x2940 kernel/exit.c:941
 do_group_exit+0x207/0x2c0 kernel/exit.c:1103
 get_signal+0x1696/0x1730 kernel/signal.c:3035
 arch_do_signal_or_restart+0x98/0x840 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f825437ff19
RSP: 002b:00007f82535fe0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00007f8254545fa8 RCX: 00007f825437ff19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f8254545fa8
RBP: 00007f8254545fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8254545fac
R13: 0000000000000000 R14: 00007ffc9a341d40 R15: 00007ffc9a341e28
 </TASK>
rcu: rcu_preempt kthread starved for 10920 jiffies! g11461 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:26864 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5366 [inline]
 __schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
 __schedule_loop kernel/sched/core.c:6824 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6839
 schedule_timeout+0x15b/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 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: 6591 Comm: kworker/1:5 Not tainted 6.14.0-syzkaller-05884-g2ea396448f26 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_power_efficient gc_worker
RIP: 0010:seqcount_lockdep_reader_access+0x1e2/0x230 include/linux/seqlock.h:75
Code: f7 4d 85 ff 75 16 e8 bd 9d 98 f7 eb 15 e8 b6 9d 98 f7 e8 31 87 f5 01 4d 85 ff 74 ea e8 a7 9d 98 f7 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 66 43 c7 44 25 09 00 00 43 c6 44 25 0b
RSP: 0000:ffffc90003da7900 EFLAGS: 00000293
RAX: ffffffff8a2ad959 RBX: 0000000000000000 RCX: ffff888026888000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003da79b0 R08: ffffffff8a2ad92f R09: 1ffffffff20ba66e
R10: dffffc0000000000 R11: fffffbfff20ba66f R12: 1ffff920007b4f20
R13: dffffc0000000000 R14: 0000000000000046 R15: 0000000000000200
FS:  0000000000000000(0000) GS:ffff88812510f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b1d72d02e0 CR3: 00000000608a2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:333 [inline]
 gc_worker+0x31b/0x1420 net/netfilter/nf_conntrack_core.c:1534
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd30 kernel/workqueue.c:3400
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>