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): P27891/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=211785, q=655 ncpus=2)
task:syz.7.6499 state:R running task stack:25640 pid:27891 tgid:27890 ppid:19742 task_flags:0x40044c flags:0x20004004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7090
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x5/0x3e0 kernel/locking/lockdep.c:5874
Code: 8b 7c 24 18 e9 92 f9 ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <41> 57 41 56 41 55 41 54 53 48 83 ec 30 48 89 f5 49 89 ff 48 8d 1d
RSP: 0018:ffffc9000aaff218 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc9000aaff300 RCX: ffff88807d453c00
RDX: ffffffff90e31c0e RSI: ffffffff816d9bc8 RDI: ffffffff8ed3df20
RBP: ffffc9000aaff301 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000aaff310
R13: dffffc0000000000 R14: 00000000f509d55c R15: ffffffff816d9bc8
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0x1a9f/0x23b0 arch/x86/kernel/unwind_orc.c:680
arch_stack_walk+0x11e/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbf/0xd0 mm/kasan/generic.c:548
slab_free_hook mm/slub.c:2359 [inline]
slab_free mm/slub.c:4656 [inline]
kmem_cache_free+0x2ff/0x410 mm/slub.c:4758
exit_mmap+0x73e/0xde0 mm/mmap.c:1309
__mmput+0x115/0x420 kernel/fork.c:1379
exit_mm+0x221/0x310 kernel/exit.c:589
do_exit+0x994/0x27f0 kernel/exit.c:940
do_group_exit+0x207/0x2c0 kernel/exit.c:1102
get_signal+0x1696/0x1730 kernel/signal.c:3034
arch_do_signal_or_restart+0x98/0x810 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_fast_syscall_32+0xc1/0x110 arch/x86/entry/syscall_32.c:309
do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf70ad539
RSP: 002b:00000000f509d55c EFLAGS: 00000206 ORIG_RAX: 0000000000000159
RAX: 000000000000000b RBX: 0000000000000004 RCX: 00000000800bd000
RDX: 0000000000000318 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10013 jiffies! g211785 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:26688 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
schedule_timeout+0x15b/0x2b0 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+0x7b7/0x940 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
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.15.0-rc3-syzkaller-00008-ga33b5a08cbbd #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__rcu_read_unlock+0x7d/0x110 kernel/rcu/tree_plugin.h:443
Code: 04 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 88 00 00 00 41 83 3f 00 75 29 42 0f b6 04 23 84 c0 75 62 41 8b 45 00 <3d> 00 00 00 40 73 0f 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc
RSP: 0018:ffffc90000a07930 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 1ffff11003ad9bc8 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: ffffffff8e4db4c4 RDI: ffffffff8ca1b680
RBP: 0000000000000002 R08: ffffc90000197f20 R09: 0000000000000000
R10: ffffc90000a07a90 R11: fffff52000140f54 R12: dffffc0000000000
R13: ffff88801d6cde44 R14: ffff88801d6cda00 R15: ffffffff816d9bc8
FS: 0000000000000000(0000) GS:ffff88812509a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000008004a018 CR3: 000000006520e000 CR4: 00000000003526f0
Call Trace:
rcu_read_unlock include/linux/rcupdate.h:873 [inline]
class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0x1aa4/0x23b0 arch/x86/kernel/unwind_orc.c:680
arch_stack_walk+0x11e/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4161 [inline]
slab_alloc_node mm/slub.c:4210 [inline]
kmem_cache_alloc_node_noprof+0x1f2/0x3b0 mm/slub.c:4262
kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:577
__alloc_skb+0x1f2/0x480 net/core/skbuff.c:668
alloc_skb include/linux/skbuff.h:1340 [inline]
synproxy_send_client_synack+0x1ae/0xf70 net/netfilter/nf_synproxy_core.c:460
nft_synproxy_eval_v4+0x3cc/0x610 net/netfilter/nft_synproxy.c:59
nft_synproxy_do_eval+0x36a/0xa90 net/netfilter/nft_synproxy.c:141
expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
nft_do_chain+0x4b2/0x1db0 net/netfilter/nf_tables_core.c:285
nft_do_chain_inet+0x41f/0x6b0 net/netfilter/nft_chain_filter.c:161
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_slow+0xc8/0x220 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:269 [inline]
NF_HOOK+0x29b/0x450 include/linux/netfilter.h:312
NF_HOOK+0x3a0/0x450 include/linux/netfilter.h:314
__netif_receive_skb_one_core net/core/dev.c:5887 [inline]
__netif_receive_skb+0x2c9/0x670 net/core/dev.c:6000
process_backlog+0x664/0x15c0 net/core/dev.c:6352
__napi_poll+0xcb/0x480 net/core/dev.c:7324
napi_poll net/core/dev.c:7388 [inline]
net_rx_action+0x89d/0x1240 net/core/dev.c:7510
handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:81
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 53 7e 18 00 f3 0f 1e fa fb f4 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197dc0 EFLAGS: 000002c6
RAX: af3004982b53ec00 RBX: ffffffff8197272e RCX: ffffffff8c2fb89c
RDX: 0000000000000001 RSI: ffffffff8e6497f7 RDI: ffffffff8ca1b680
RBP: ffffc90000197f20 R08: ffff8880b8732b5b R09: 1ffff110170e656b
R10: dffffc0000000000 R11: ffffed10170e656c R12: 1ffff92000032fd2
R13: 1ffff11003ad9b40 R14: 0000000000000001 R15: dffffc0000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:748
default_idle_call+0x74/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x22e/0x5d0 kernel/sched/idle.c:325
cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:423
start_secondary+0xfe/0x100 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x147