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): P28754/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=116701, q=3775 ncpus=2)
task:syz.2.5965 state:R running task stack:26712 pid:28754 tgid:28753 ppid:17694 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7228
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7552
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x17/0x90 kernel/kcov.c:288
Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 15 18 48 74 11 65 8b 0d 39 48 74 11 <81> e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba 1c 17 00 00
RSP: 0018:ffffc90003d97ac0 EFLAGS: 00000246
RAX: ffffffff89785691 RBX: 000000000000000e RCX: 0000000080000000
RDX: ffff88802d0b1f00 RSI: 000000000000000e RDI: 000000000000000e
RBP: 000000000000000e R08: ffff88802d0b1f00 R09: 0000000000000002
R10: 0000000000000010 R11: 0000000000000002 R12: dffffc0000000000
R13: 1ffff920007b2f84 R14: ffffc90003d97c22 R15: 000000000000000e
bpf_flow_dissect+0x3d1/0x730 net/core/flow_dissector.c:1027
bpf_prog_test_run_flow_dissector+0x3a4/0x610 net/bpf/test_run.c:1524
bpf_prog_test_run+0x2c5/0x340 kernel/bpf/syscall.c:4742
__sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6292
__do_sys_bpf kernel/bpf/syscall.c:6387 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6385 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6385
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6ac9b9ce59
RSP: 002b:00007f6acaa33028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f6ac9e15fa0 RCX: 00007f6ac9b9ce59
RDX: 0000000000000050 RSI: 00002000000002c0 RDI: 000000000000000a
RBP: 00007f6ac9c32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6ac9e16038 R14: 00007f6ac9e15fa0 R15: 00007ffc9f34be38
rcu: rcu_preempt kthread starved for 3623 jiffies! g116701 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:28040 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
kthread+0x388/0x470 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: 9165 Comm: kworker/u8:53 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: bat_events batadv_tt_purge
RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x70 kernel/kcov.c:235
Code: f8 16 00 00 83 fa 02 75 21 48 8b 91 00 17 00 00 48 8b 32 48 8d 7e 01 8b 89 fc 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 cc cc cc cc cc 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc90000007090 EFLAGS: 00000246
RAX: ffffffff8a553f99 RBX: ffff88807d7eba00 RCX: ffff88807c5f9f00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000100 R12: dffffc0000000000
R13: ffff88807d7eba20 R14: ffffffff8a553ead R15: ffff888029630000
FS: 0000000000000000(0000) GS:ffff88812527c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556e7d44e8 CR3: 000000000e746000 CR4: 00000000003526f0
Call Trace:
dst_dev_rcu include/net/dst.h:582 [inline]
ip6_dst_mtu_maybe_forward include/net/ip6_route.h:379 [inline]
ip6_mtu+0x169/0x490 net/ipv6/route.c:3290
__ip6_finish_output net/ipv6/ip6_output.c:200 [inline]
ip6_finish_output+0x134/0x480 net/ipv6/ip6_output.c:219
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip6_output+0x337/0x540 net/ipv6/ip6_output.c:246
synproxy_send_tcp_ipv6+0x549/0x700 net/netfilter/nf_synproxy_core.c:861
synproxy_send_client_synack_ipv6+0x83f/0xcd0 net/netfilter/nf_synproxy_core.c:907
nft_synproxy_eval_v6+0x37b/0x530 net/netfilter/nft_synproxy.c:91
nft_synproxy_do_eval+0x3d1/0x550 net/netfilter/nft_synproxy.c:146
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:158 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619
nf_hook include/linux/netfilter.h:273 [inline]
NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:316
ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:545
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
__netif_receive_skb_one_core net/core/dev.c:6206 [inline]
__netif_receive_skb net/core/dev.c:6319 [inline]
process_backlog+0x774/0x1860 net/core/dev.c:6670
__napi_poll+0xaa/0x330 net/core/dev.c:7729
napi_poll net/core/dev.c:7792 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:7949
handle_softirqs+0x225/0x840 kernel/softirq.c:622
do_softirq+0x76/0xd0 kernel/softirq.c:523
__local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_tt_global_purge net/batman-adv/translation-table.c:2298 [inline]
batadv_tt_purge+0x4ae/0xa10 net/batman-adv/translation-table.c:3558
process_one_work kernel/workqueue.c:3314 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3397
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3478
kthread+0x388/0x470 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