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): P27579/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=111793, q=276 ncpus=1)
task:syz.0.8570 state:R running task stack:27048 pid:27579 tgid:27578 ppid:5823 task_flags:0x40054c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7194
irqentry_exit+0x17b/0x670 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
RIP: 0010:rcu_read_lock include/linux/rcupdate.h:867 [inline]
RIP: 0010:percpu_ref_put_many include/linux/percpu-refcount.h:330 [inline]
RIP: 0010:percpu_ref_put include/linux/percpu-refcount.h:351 [inline]
RIP: 0010:css_put include/linux/cgroup_refcnt.h:79 [inline]
RIP: 0010:css_put include/linux/cgroup_refcnt.h:76 [inline]
RIP: 0010:uncharge_folio+0x541/0x9b0 mm/memcontrol.c:4907
Code: 3c 02 00 0f 85 14 04 00 00 48 c7 43 38 00 00 00 00 e9 20 fe ff ff e8 6e ae 71 ff 31 d2 45 31 c9 45 31 c0 48 8d 05 00 00 00 00 <50> b9 02 00 00 00 31 f6 48 c7 c7 20 31 5e 8e e8 5b 3d 69 ff e8 c6
RSP: 0018:ffffc9000f217458 EFLAGS: 00000246
RAX: ffffffff827948d1 RBX: ffffea0002016b00 RCX: ffffffff827947ca
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888034b24184
RBP: ffffea0002016b00 R08: 0000000000000000 R09: 0000000000000000
R10: ffffea0002016b07 R11: 0000000000000000 R12: ffff88814045a7c0
R13: 0000000000000001 R14: ffffea0002016b38 R15: 0000000000000000
__mem_cgroup_uncharge_folios+0x11b/0x1e0 mm/memcontrol.c:4930
mem_cgroup_uncharge_folios include/linux/memcontrol.h:691 [inline]
folios_put_refs+0x52f/0x840 mm/swap.c:1001
free_pages_and_swap_cache+0x242/0x480 mm/swap_state.c:355
__tlb_batch_free_encoded_pages+0xe9/0x280 mm/mmu_gather.c:137
tlb_batch_pages_flush mm/mmu_gather.c:150 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:398 [inline]
tlb_flush_mmu mm/mmu_gather.c:405 [inline]
tlb_finish_mmu+0x1b0/0x810 mm/mmu_gather.c:530
exit_mmap+0x3c5/0xae0 mm/mmap.c:1290
__mmput+0x12a/0x410 kernel/fork.c:1173
mmput+0x67/0x80 kernel/fork.c:1196
exit_mm kernel/exit.c:581 [inline]
do_exit+0x78a/0x2a30 kernel/exit.c:959
do_group_exit+0xd5/0x2a0 kernel/exit.c:1112
get_signal+0x1ec7/0x21e0 kernel/signal.c:3034
arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop+0x86/0x4b0 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x4ea/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6d6e79aeb9
RSP: 002b:00007f6d6f69f0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f6d6ea15fa8 RCX: 00007f6d6e79aeb9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6d6ea15fa8
RBP: 00007f6d6ea15fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6d6ea16038 R14: 00007ffe31177d00 R15: 00007ffe31177de8
rcu: rcu_preempt kthread starved for 255 jiffies! g111793 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:28552 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0xb00 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x21e/0x320 kernel/rcu/tree.c:2285
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 3408 Comm: kworker/R-bat_e Tainted: G U I L syzkaller #0 PREEMPT(full)
Tainted: [U]=USER, [I]=FIRMWARE_WORKAROUND, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:lock_release+0x19e/0x2e0 kernel/locking/lockdep.c:5893
Code: ff 65 0f c1 05 5b 8a 01 12 83 f8 01 0f 85 f7 00 00 00 9c 58 f6 c4 02 0f 85 0c 01 00 00 41 f7 c6 00 02 00 00 0f 85 99 00 00 00 <48> 8b 44 24 10 65 48 2b 05 ed 42 01 12 0f 85 0f 01 00 00 48 83 c4
RSP: 0018:ffffc90000006b58 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e5e3120 RCX: ffffc90000006b64
RDX: 0000000000000004 RSI: ffffffff8dc1b439 RDI: ffffffff8bfa32a0
RBP: ffffffff81b6438e R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000094603 R12: ffff888031d21e80
R13: ffffc90000006c10 R14: 0000000000000206 R15: 0000000000000005
FS: 0000000000000000(0000) GS:ffff8881245e3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0e2e532f8c CR3: 00000000628fc000 CR4: 00000000003526f0
Call Trace:
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:897 [inline]
class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0x3c3/0x1ea0 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6674 [inline]
kmem_cache_free+0x143/0x720 mm/slub.c:6785
kfree_skbmem+0x19a/0x210 net/core/skbuff.c:1130
__kfree_skb net/core/skbuff.c:1197 [inline]
sk_skb_reason_drop+0x10f/0x1b0 net/core/skbuff.c:1234
kfree_skb_reason include/linux/skbuff.h:1322 [inline]
dev_kfree_skb_any_reason net/core/dev.c:3463 [inline]
dev_kfree_skb_any_reason+0x79/0x90 net/core/dev.c:3458
dev_kfree_skb_any include/linux/netdevice.h:4194 [inline]
team_dummy_transmit+0x1a/0x30 drivers/net/team/team_core.c:503
team_xmit+0x34e/0x460 drivers/net/team/team_core.c:1683
__netdev_start_xmit include/linux/netdevice.h:5273 [inline]
netdev_start_xmit include/linux/netdevice.h:5282 [inline]
xmit_one net/core/dev.c:3866 [inline]
dev_hard_start_xmit+0x127/0x6c0 net/core/dev.c:3882
__dev_queue_xmit+0x6dd/0x46f0 net/core/dev.c:4832
dev_queue_xmit include/linux/netdevice.h:3381 [inline]
br_dev_queue_push_xmit+0x587/0x880 net/bridge/br_forward.c:53
NF_HOOK include/linux/netfilter.h:318 [inline]
NF_HOOK include/linux/netfilter.h:312 [inline]
br_forward_finish+0x102/0x4d0 net/bridge/br_forward.c:66
NF_HOOK include/linux/netfilter.h:318 [inline]
NF_HOOK include/linux/netfilter.h:312 [inline]
__br_forward+0x6b1/0x970 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0xf0/0x180 net/bridge/br_forward.c:191
br_flood+0x193/0x650 net/bridge/br_forward.c:238
br_handle_frame_finish+0xf57/0x1f00 net/bridge/br_input.c:229
nf_hook_bridge_pre net/bridge/br_input.c:313 [inline]
br_handle_frame+0xeec/0x1510 net/bridge/br_input.c:442
__netif_receive_skb_core.constprop.0+0x6d7/0x3460 net/core/dev.c:6039
__netif_receive_skb_one_core+0xb0/0x1e0 net/core/dev.c:6150
__netif_receive_skb+0x1f/0x120 net/core/dev.c:6265
process_backlog+0x37a/0x1580 net/core/dev.c:6617
__napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7681
napi_poll net/core/dev.c:7744 [inline]
net_rx_action+0xa40/0xf20 net/core/dev.c:7896
handle_softirqs+0x1ea/0x910 kernel/softirq.c:622
do_softirq kernel/softirq.c:523 [inline]
do_softirq+0xac/0xe0 kernel/softirq.c:510
__local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:450
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_tt_local_purge+0x21c/0x3d0 net/batman-adv/translation-table.c:1315
batadv_tt_purge+0x8b/0xbd0 net/batman-adv/translation-table.c:3509
process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
rescuer_thread+0x8f1/0xf40 kernel/workqueue.c:3528
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246