rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5841/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=28441, q=245 ncpus=2)
task:syz-executor state:R running task stack:20648 pid:5841 tgid:5841 ppid:5825 task_flags:0x400140 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5367 [inline]
__schedule+0x1b18/0x50e0 kernel/sched/core.c:6748
preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7070
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:unwind_done arch/x86/include/asm/unwind.h:50 [inline]
RIP: 0010:__unwind_start+0x5ac/0x740 arch/x86/kernel/unwind_orc.c:757
Code: bd 00 48 8b 44 24 10 48 39 03 0f 87 3b fb ff ff 4c 89 f7 e8 26 d2 ff ff 48 ba 00 00 00 00 00 fc ff df 48 8b 04 24 0f b6 04 10 <84> c0 75 0f 41 83 3e 00 0f 85 5d ff ff ff e9 0e fb ff ff 44 89 f1
RSP: 0018:ffffc9000305eee0 EFLAGS: 00000282
RAX: 0000000000000000 RBX: ffffc9000305ef78 RCX: 0000000080000000
RDX: dffffc0000000000 RSI: ffffc90003058000 RDI: 0000000000000001
RBP: 1ffff9200060bde9 R08: ffffc9000305ef30 R09: ffffc9000305ef90
R10: dffffc0000000000 R11: fffff5200060bdf4 R12: 1ffff9200060bdea
R13: ffffc9000305ef50 R14: ffffc9000305ef40 R15: ffffc9000305ef48
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe7/0x150 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
save_stack+0xfc/0x1f0 mm/page_owner.c:156
__reset_page_owner+0x79/0x440 mm/page_owner.c:297
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1127 [inline]
free_frozen_pages+0xe16/0x10f0 mm/page_alloc.c:2660
discard_slab mm/slub.c:2707 [inline]
__put_partials+0x160/0x1c0 mm/slub.c:3176
put_cpu_partial+0x17e/0x250 mm/slub.c:3251
__slab_free+0x294/0x390 mm/slub.c:4503
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:4138 [inline]
slab_alloc_node mm/slub.c:4187 [inline]
__do_kmalloc_node mm/slub.c:4317 [inline]
__kmalloc_noprof+0x238/0x4d0 mm/slub.c:4330
kmalloc_noprof include/linux/slab.h:906 [inline]
tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_check_open_permission+0x25a/0x4f0 security/tomoyo/file.c:771
security_file_open+0xac/0x250 security/security.c:3114
do_dentry_open+0x320/0x1960 fs/open.c:933
vfs_open+0x3b/0x370 fs/open.c:1086
do_open fs/namei.c:3845 [inline]
path_openat+0x2caf/0x35d0 fs/namei.c:4004
do_filp_open+0x284/0x4e0 fs/namei.c:4031
do_sys_openat2+0x12b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x249/0x2a0 fs/open.c:1455
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: 0033:0x7f8edfb8ca61
RSP: 002b:00007fff26f42430 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000164 RCX: 00007f8edfb8ca61
RDX: 0000000000090800 RSI: 00007f8edfc0e5c0 RDI: 00000000ffffff9c
RBP: 00007fff26f424dc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000070
R13: 0000000000000000 R14: 0000000000052a4b R15: 00007fff26f42530
rcu: rcu_preempt kthread starved for 2459 jiffies! g28441 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:26744 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5367 [inline]
__schedule+0x1b18/0x50e0 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6840
schedule_timeout+0x15b/0x290 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+0x7ab/0x920 kernel/kthread.c:464
ret_from_fork+0x4d/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:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd9/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 2b 00 74 08 4c 89 f7 e8 8d 10 0e f6 f6 44 24 21 02 75 55 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 62 0a 73 f5 65 8b 05 cb 4e 22 07 85 c0 74 46 48 c7 04 24 0e 36
RSP: 0018:ffffc90000a077e0 EFLAGS: 00000206
RAX: 603a65c3806d7b00 RBX: 1ffff92000140f00 RCX: ffffffff81cb38fc
RDX: 0000000000000000 RSI: ffffffff8e45b764 RDI: 0000000000000001
RBP: ffffc90000a07870 R08: ffffffff903cfd77 R09: 1ffffffff2079fae
R10: dffffc0000000000 R11: fffffbfff2079faf R12: 1ffff92000140efc
R13: dffffc0000000000 R14: ffffc90000a07800 R15: 0000000000000246
FS: 0000000000000000(0000) GS:ffff888125324000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5156eeb2c3 CR3: 000000005638e000 CR4: 0000000000350ef0
Call Trace:
__debug_check_no_obj_freed lib/debugobjects.c:1108 [inline]
debug_check_no_obj_freed+0x572/0x590 lib/debugobjects.c:1129
slab_free_hook mm/slub.c:2307 [inline]
slab_free mm/slub.c:4633 [inline]
kmem_cache_free+0x116/0x410 mm/slub.c:4735
kfree_skb_reason include/linux/skbuff.h:1271 [inline]
kfree_skb include/linux/skbuff.h:1280 [inline]
ip6_mc_input+0x98c/0xb90 net/ipv6/ip6_input.c:591
ip_sabotage_in+0x205/0x290 net/bridge/br_netfilter_hooks.c:993
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_slow+0xca/0x220 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:269 [inline]
NF_HOOK+0x29b/0x450 include/linux/netfilter.h:312
__netif_receive_skb_one_core net/core/dev.c:5896 [inline]
__netif_receive_skb+0x1ef/0x670 net/core/dev.c:6009
netif_receive_skb_internal net/core/dev.c:6095 [inline]
netif_receive_skb+0x1ea/0x890 net/core/dev.c:6154
NF_HOOK+0xa2/0x410 include/linux/netfilter.h:314
br_handle_frame_finish+0x188d/0x1f60 net/bridge/br_input.c:226
br_nf_hook_thresh+0x484/0x5a0 net/bridge/br_netfilter_hooks.c:1170
br_nf_pre_routing_finish_ipv6+0xaa3/0xdd0
NF_HOOK include/linux/netfilter.h:314 [inline]
br_nf_pre_routing_ipv6+0x397/0x790 net/bridge/br_netfilter_ipv6.c:184
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:282 [inline]
br_handle_frame+0x9fc/0x1530 net/bridge/br_input.c:433
__netif_receive_skb_core+0x13eb/0x4540 net/core/dev.c:5790
__netif_receive_skb_one_core net/core/dev.c:5894 [inline]
__netif_receive_skb+0x130/0x670 net/core/dev.c:6009
process_backlog+0x664/0x15c0 net/core/dev.c:6357
__napi_poll+0xcd/0x490 net/core/dev.c:7191
napi_poll net/core/dev.c:7260 [inline]
net_rx_action+0x89d/0x1240 net/core/dev.c:7382
handle_softirqs+0x2d8/0x9b0 kernel/softirq.c:561
__do_softirq kernel/softirq.c:595 [inline]
invoke_softirq kernel/softirq.c:435 [inline]
__irq_exit_rcu+0xfb/0x220 kernel/softirq.c:662
irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
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:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline]
RIP: 0010:acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:112
Code: 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 08 c0 3f 93 48 f7 00 08 00 00 00 75 10 eb 07 0f 00 2d f5 ac 6f 00 f3 0f 1e fa fb f4 e9 34 6a f5 f4 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197d08 EFLAGS: 00000246
RAX: ffff88801d2cda00 RBX: ffff88801febe864 RCX: ffffffff8c1ab7ac
RDX: 0000000000000001 RSI: ffff88801febe800 RDI: ffff88801febe864
RBP: ffffffff93411c78 R08: ffff8880b8732b5b R09: 1ffff110170e656b
R10: dffffc0000000000 R11: ffffffff8c1ad280 R12: ffff8881426e4000
R13: 0000000000000001 R14: 0000000000000001 R15: ffffffff8f338ac0
acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:701
cpuidle_enter_state+0x113/0x480 drivers/cpuidle/cpuidle.c:268
cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:389
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:230 [inline]
do_idle+0x374/0x5d0 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