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): P5630/1:b..l..
rcu: (detected by 0, t=10502 jiffies, g=78637, q=928690 ncpus=1)
task:syz-executor state:R running task stack:23880 pid:5630 tgid:5630 ppid:5621 task_flags:0x40050c flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7662
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:110 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:238 [inline]
RIP: 0010:unwind_next_frame+0x29b/0x2550 arch/x86/kernel/unwind_orc.c:510
Code: 00 00 45 39 e8 0f 84 07 04 00 00 4a 8d 14 ad 04 01 d1 91 45 29 e8 4e 8d 24 82 49 83 c4 fc 49 89 d5 4c 39 e2 0f 86 22 02 00 00 <49> 29 d5 49 c1 fd 02 4a 8d 04 6d 00 00 00 00 4c 01 e8 48 8d 14 46
RSP: 0018:ffffc90003ba7020 EFLAGS: 00000202
RAX: ffffffff91d9d7fc RBX: ffffffff91d9d800 RCX: ffffffff91d9d804
RDX: ffffffff91d9d800 RSI: ffffffff925b0a0a RDI: ffffffff8c8ea020
RBP: ffffffff81ad95ad R08: 0000000000000003 R09: 0000000000000000
R10: ffffc90003ba7118 R11: ffffffff81b3ad40 R12: ffffffff91d9d800
R13: ffffffff91d9d800 R14: ffffc90003ba70c8 R15: ffffffff91d9d804
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:351 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:5033 [inline]
kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5047
kmem_alloc_batch lib/debugobjects.c:371 [inline]
fill_pool+0x163/0x610 lib/debugobjects.c:420
debug_objects_fill_pool lib/debugobjects.c:780 [inline]
debug_object_activate+0x38d/0x420 lib/debugobjects.c:869
debug_rcu_head_queue kernel/rcu/rcu.h:245 [inline]
rcu_do_enqueue+0x2a/0x870 kernel/rcu/tree.c:3164
__call_rcu_common kernel/rcu/tree.c:3300 [inline]
call_rcu+0x20e/0x300 kernel/rcu/tree.c:3395
slab_free_hook mm/slub.c:2744 [inline]
slab_free mm/slub.c:6630 [inline]
kmem_cache_free+0x471/0x650 mm/slub.c:6757
tear_down_vmas+0x31f/0x530 mm/mmap.c:1277
exit_mmap+0x4ca/0xa40 mm/mmap.c:1335
__mmput+0x118/0x420 kernel/fork.c:1192
exit_mm+0x18e/0x240 kernel/exit.c:586
do_exit+0x6a8/0x2360 kernel/exit.c:967
do_group_exit+0x22d/0x2f0 kernel/exit.c:1123
get_signal+0x1216/0x12c0 kernel/signal.c:3112
arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1c5895a6d7
RSP: 002b:00007ffce6235ce0 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 0000555581720500 RCX: 00007f1c5895a6d7
RDX: 0000000040000000 RSI: 00007ffce6235d3c RDI: ffffffffffffffff
RBP: 00007ffce6235d3c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffce6235f98 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 539 jiffies! g78637 f0x2 RCU_GP_WAIT_FQS(5) ->state=R ->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:28104 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x17dd/0x5830 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7474
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 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: 3233 Comm: kworker/R-bat_e Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:__dev_queue_xmit+0x15b4/0x3920 net/core/dev.c:-1
Code: e8 01 10 fb f7 85 db 0f 85 dd 09 00 00 e8 e4 0a fb f7 45 84 f6 0f 84 f5 09 00 00 e8 d6 0a fb f7 e9 73 f2 ff ff e8 cc 0a fb f7 <49> bc 00 00 00 00 00 fc ff df 48 83 7c 24 08 00 75 b9 e8 b5 0a fb
RSP: 0018:ffffc90000006f40 EFLAGS: 00000246
RAX: ffffffff89ce0fa4 RBX: 1ffff1100fd20a30 RCX: ffff888032eb0000
RDX: 8000000000000300 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffffc900000071f0 R08: 0000000000000100 R09: 1ffff1100fd20a32
R10: dffffc0000000000 R11: ffffed100fd20a33 R12: 0000000100000000
R13: 1ffff92000000e08 R14: 0000000000000000 R15: 0000000100088000
FS: 0000000000000000(0000) GS:ffff888123411000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b5b3014088 CR3: 0000000026af6000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 8000000000000001
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
dev_queue_xmit include/linux/netdevice.h:3483 [inline]
neigh_hh_output include/net/neighbour.h:538 [inline]
neigh_output include/net/neighbour.h:552 [inline]
ip_finish_output2+0xbda/0x10b0 net/ipv4/ip_output.c:236
NF_HOOK_COND include/linux/netfilter.h:314 [inline]
ip_output+0x29f/0x450 net/ipv4/ip_output.c:437
synproxy_send_client_synack+0x89b/0xde0 net/netfilter/nf_synproxy_core.c:487
nft_synproxy_eval_v4+0x362/0x4e0 net/netfilter/nft_synproxy.c:59
nft_synproxy_do_eval+0x389/0x5d0 net/netfilter/nft_synproxy.c:142
expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
nft_do_chain+0x48d/0x1b10 net/netfilter/nf_tables_core.c:285
nft_do_chain_inet+0x360/0x4b0 net/netfilter/nft_chain_filter.c:162
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:633
nf_hook include/linux/netfilter.h:280 [inline]
NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:323
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:325
__netif_receive_skb_one_core net/core/dev.c:6405 [inline]
__netif_receive_skb net/core/dev.c:6518 [inline]
process_backlog+0xa6b/0x18b0 net/core/dev.c:6869
__napi_poll+0xaa/0x330 net/core/dev.c:7938
napi_poll net/core/dev.c:8001 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8158
handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
do_softirq+0x77/0xd0 kernel/softirq.c:569
__local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
spin_unlock_bh include/linux/spinlock.h:407 [inline]
batadv_tt_global_purge net/batman-adv/translation-table.c:2880 [inline]
batadv_tt_purge+0x4ee/0xa40 net/batman-adv/translation-table.c:4270
process_one_work kernel/workqueue.c:3495 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
rescuer_thread+0x84a/0x12a0 kernel/workqueue.c:3803
kthread+0x38b/0x480 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