rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P90/1:b..l P5212/1:b..l P2/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=19405, q=396778 ncpus=2)
task:kthreadd state:R running task stack:25288 pid:2 tgid:2 ppid:0 task_flags:0x208040 flags:0x00004000
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_acquire+0x167/0x2f0 arch/x86/include/asm/irqflags.h:-1
Code: c7 44 24 10 00 00 00 00 9c 8f 44 24 10 f7 44 24 10 00 02 00 00 0f 85 fd 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 65 48 8b 45 00 <48> 3b 44 24 38 0f 85 72 01 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90000077168 EFLAGS: 00000206
RAX: 55079b0926cc7b00 RBX: ffffffff8ed3dfe0 RCX: 55079b0926cc7b00
RDX: 0000000000000000 RSI: ffffffff8e4fd53d RDI: ffffffff8ca1b6a0
RBP: ffffffff9368a020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000246 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0xd5/0x23b0 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x11e/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
save_stack+0xfc/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x76/0x1e0 mm/page_owner.c:308
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0xde8/0x10a0 mm/page_alloc.c:2680
discard_slab mm/slub.c:2720 [inline]
__put_partials+0x160/0x1c0 mm/slub.c:3189
put_cpu_partial+0x17e/0x250 mm/slub.c:3264
__slab_free+0x294/0x390 mm/slub.c:4516
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_kmalloc+0x23/0xb0 mm/kasan/common.c:385
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4331 [inline]
__kmalloc_noprof+0x28e/0x4d0 mm/slub.c:4343
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
lsm_blob_alloc security/security.c:684 [inline]
lsm_cred_alloc security/security.c:701 [inline]
security_prepare_creds+0x53/0x360 security/security.c:3241
prepare_creds+0x4b4/0x6f0 kernel/cred.c:242
copy_creds+0x109/0x9c0 kernel/cred.c:312
copy_process+0x9ec/0x3d10 kernel/fork.c:2293
kernel_clone+0x242/0x930 kernel/fork.c:2844
kernel_thread+0x1c2/0x250 kernel/fork.c:2906
create_kthread kernel/kthread.c:487 [inline]
kthreadd+0x621/0x850 kernel/kthread.c:847
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:udevd state:R running task stack:23176 pid:5212 tgid:5212 ppid:1 task_flags:0x400140 flags:0x00000002
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:__preempt_count_add kernel/rcu/tree.c:732 [inline]
RIP: 0010:rcu_is_watching+0x6/0xb0 kernel/rcu/tree.c:735
Code: 60 16 98 03 eb cd 66 66 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 41 57 <41> 56 53 65 ff 05 10 eb bf 11 e8 3b ea 87 0a 89 c3 83 f8 08 73 7a
RSP: 0018:ffffc90003017698 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88807d9b0000
RDX: ffff88807d9b0000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff81d3035a R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807d9b0000
R13: ffffffff81aee970 R14: 0000000000000001 R15: 00007ffa501165f4
rcu_read_lock include/linux/rcupdate.h:842 [inline]
is_bpf_text_address+0x63/0x2a0 kernel/bpf/core.c:772
kernel_text_address+0xa7/0xe0 kernel/extable.c:125
__kernel_text_address+0xd/0x40 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0xff/0x150 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
save_stack+0xfc/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x76/0x1e0 mm/page_owner.c:308
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0xde8/0x10a0 mm/page_alloc.c:2680
discard_slab mm/slub.c:2720 [inline]
__put_partials+0x160/0x1c0 mm/slub.c:3189
put_cpu_partial+0x17e/0x250 mm/slub.c:3264
__slab_free+0x294/0x390 mm/slub.c:4516
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4151 [inline]
slab_alloc_node mm/slub.c:4200 [inline]
kmem_cache_alloc_noprof+0x1e1/0x390 mm/slub.c:4207
getname_flags+0xb6/0x530 fs/namei.c:146
getname include/linux/fs.h:2852 [inline]
getname_maybe_null include/linux/fs.h:2859 [inline]
vfs_fstatat+0x43/0x150 fs/stat.c:363
__do_sys_newfstatat fs/stat.c:532 [inline]
__se_sys_newfstatat fs/stat.c:526 [inline]
__x64_sys_newfstatat+0x11f/0x1a0 fs/stat.c:526
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa501165f4
RSP: 002b:00007ffedcda8258 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00005621f0d276d8 RCX: 00007ffa501165f4
RDX: 00007ffedcda8268 RSI: 00005621f0d17897 RDI: 00000000ffffff9c
RBP: 00005621fd05e448 R08: 00063251b510f24b R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00063251b510f24b R15: 00005621f0d1bdca
task:kswapd0 state:R running task stack:24296 pid:90 tgid:90 ppid:2 task_flags:0x220840 flags:0x00004000
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_acquire+0x167/0x2f0 arch/x86/include/asm/irqflags.h:-1
Code: c7 44 24 10 00 00 00 00 9c 8f 44 24 10 f7 44 24 10 00 02 00 00 0f 85 fd 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 65 48 8b 45 00 <48> 3b 44 24 38 0f 85 72 01 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900015c69a8 EFLAGS: 00000206
RAX: 616688faaf939a00 RBX: ffffffff8ed3dfe0 RCX: 616688faaf939a00
RDX: 0000000000000000 RSI: ffffffff8e4fd53d RDI: ffffffff8ca1b6a0
RBP: ffffffff9368a020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000246 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0xd5/0x23b0 arch/x86/kernel/unwind_orc.c:479
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
__call_rcu_common kernel/rcu/tree.c:3082 [inline]
call_rcu+0x172/0xad0 kernel/rcu/tree.c:3202
__destroy_inode+0x2d9/0x670 fs/inode.c:371
destroy_inode fs/inode.c:394 [inline]
evict+0x78d/0x9b0 fs/inode.c:834
__dentry_kill+0x20d/0x630 fs/dcache.c:660
shrink_kill+0xa9/0x2c0 fs/dcache.c:1105
shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1132
prune_dcache_sb+0x111/0x180 fs/dcache.c:1213
super_cache_scan+0x3a8/0x510 fs/super.c:221
do_shrink_slab+0x715/0x1140 mm/shrinker.c:437
shrink_slab+0x1097/0x14e0 mm/shrinker.c:664
shrink_one+0x43b/0x850 mm/vmscan.c:4906
shrink_many mm/vmscan.c:4967 [inline]
lru_gen_shrink_node mm/vmscan.c:5045 [inline]
shrink_node+0x37a1/0x3e10 mm/vmscan.c:6016
kswapd_shrink_node mm/vmscan.c:6844 [inline]
balance_pgdat mm/vmscan.c:7027 [inline]
kswapd+0x210d/0x3b10 mm/vmscan.c:7292
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: rcu_preempt kthread starved for 7841 jiffies! g19405 f0x2 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-rc1-syzkaller-00025-gbec7dcbc242c #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__lock_acquire+0xab8/0xd80 kernel/locking/lockdep.c:5232
Code: 03 85 c0 74 22 83 3d 1a 13 c1 0e 00 75 19 90 48 c7 c7 56 ce 4f 8e 48 c7 c6 e7 e2 4f 8e e8 10 7b e3 ff 90 0f 0b 90 90 90 31 c0 <48> 83 78 40 00 0f 84 b8 01 00 00 4c 89 ef 48 89 de 8b 54 24 10 48
RSP: 0018:ffffc90000a07c70 EFLAGS: 00000002
RAX: ffffffff94113788 RBX: ffff88801d6ce568 RCX: 000000005c37a3a3
RDX: 000000005c62bf56 RSI: 00000000334c999e RDI: 0000000000000003
RBP: b6eb7cf13c21aad1 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000a78124f4
R13: ffff88801d6cda00 R14: ffff88801d6ce588 R15: 000000007a03e46b
FS: 0000000000000000(0000) GS:ffff888125096000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000001f3030 CR3: 0000000032b44000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
__raw_spin_trylock include/linux/spinlock_api_smp.h:90 [inline]
_raw_spin_trylock+0x46/0x80 kernel/locking/spinlock.c:138
calc_usage lib/debugobjects.c:441 [inline]
alloc_object+0x5b/0x310 lib/debugobjects.c:455
lookup_object_or_alloc lib/debugobjects.c:685 [inline]
debug_object_activate+0x266/0x5c0 lib/debugobjects.c:820
debug_rcu_head_queue kernel/rcu/rcu.h:224 [inline]
__call_rcu_common kernel/rcu/tree.c:3067 [inline]
call_rcu+0x99/0xad0 kernel/rcu/tree.c:3202
refdst_drop include/net/dst.h:263 [inline]
skb_dst_drop include/net/dst.h:275 [inline]
skb_release_head_state+0x73/0x250 net/core/skbuff.c:1146
skb_release_all net/core/skbuff.c:1160 [inline]
__kfree_skb net/core/skbuff.c:1176 [inline]
consume_skb+0x60/0xf0 net/core/skbuff.c:1408
nft_synproxy_eval_v4+0x3d4/0x610 net/netfilter/nft_synproxy.c:60
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:5894 [inline]
__netif_receive_skb+0x2c9/0x670 net/core/dev.c:6007
process_backlog+0x664/0x15c0 net/core/dev.c:6359
__napi_poll+0xcb/0x480 net/core/dev.c:7331
napi_poll net/core/dev.c:7395 [inline]
net_rx_action+0x89d/0x1240 net/core/dev.c:7517
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 0f 1f 00 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 13 a1 17 00 f3 0f 1e fa fb f4 cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197dc0 EFLAGS: 000002c6
RAX: 48e7b579754a1d00 RBX: ffffffff8197af7e RCX: ffffffff8c30995c
RDX: 0000000000000001 RSI: ffffffff8e69c6c2 RDI: ffffffff8ca1b6a0
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