rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5206/1:b..l P5846/1:b..l P6755/1:b..l P5848/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=14449, q=453 ncpus=2)
task:syz-executor state:R running task stack:21392 pid:5848 tgid:5848 ppid:5827 task_flags:0x400140 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5366 [inline]
__schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7069
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:stack_depot_save_flags+0x4a2/0x970 lib/stackdepot.c:679
Code: be 02 00 00 00 e8 9e 19 e9 fc 4d 85 ff 74 27 41 8b 47 18 65 49 8b 4d 00 48 3b 4c 24 38 0f 85 cb 04 00 00 48 83 c4 40 5b 41 5c <41> 5d 41 5e 41 5f 5d c3 cc cc cc cc 31 c0 eb d9 e8 29 85 f5 fb 4d
RSP: 0018:ffffc9000406f518 EFLAGS: 00000282
RAX: 00000000006203de RBX: ffff88803541c190 RCX: 7410a7a3b2ce7400
RDX: ffff88823b0ebe40 RSI: 0000000000000002 RDI: 00000000918afbb7
RBP: 0000000000000001 R08: ffffffff933fc020 R09: ffffc9000406f580
R10: 0000000000000010 R11: ffffffff81aeea80 R12: 1ffff9200080deac
R13: ffffffff933fc020 R14: 000000002c92ebe4 R15: ffff888058ba0310
save_stack+0x10a/0x1f0 mm/page_owner.c:157
__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_kmalloc+0x23/0xb0 mm/kasan/common.c:385
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4318 [inline]
__kmalloc_noprof+0x28e/0x4d0 mm/slub.c:4330
kmalloc_noprof include/linux/slab.h:906 [inline]
kzalloc_noprof include/linux/slab.h:1036 [inline]
tomoyo_encode2 security/tomoyo/realpath.c:45 [inline]
tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80
tomoyo_realpath_from_path+0x59e/0x5e0 security/tomoyo/realpath.c:283
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x2be/0x640 security/tomoyo/file.c:822
tomoyo_path_rmdir+0xd1/0x110 security/tomoyo/tomoyo.c:195
security_path_rmdir+0x169/0x360 security/security.c:1949
do_rmdir+0x2bc/0x550 fs/namei.c:4471
__do_sys_unlinkat fs/namei.c:4648 [inline]
__se_sys_unlinkat fs/namei.c:4642 [inline]
__x64_sys_unlinkat+0xde/0xf0 fs/namei.c:4642
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: 0033:0x7f4c0c38c747
RSP: 002b:00007f4c0c6cecb8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f4c0c38c747
RDX: 0000000000000200 RSI: 00007f4c0c6cfe00 RDI: 00000000ffffff9c
RBP: 00007f4c0c40e08c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007f4c0c6cfe00
R13: 00007f4c0c40e08c R14: 000000000001d3f6 R15: 00007f4c0c6cfe40
task:kworker/0:8 state:R running task stack:27920 pid:6755 tgid:6755 ppid:2 task_flags:0x4208060 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5366 [inline]
__schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7069
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:stack_trace_consume_entry+0xa3/0x280 kernel/stacktrace.c:93
Code: 22 41 ff ce 41 0f b6 44 15 00 84 c0 0f 85 69 01 00 00 44 89 37 b0 01 e9 95 00 00 00 31 c0 e9 8e 00 00 00 48 89 d8 48 c1 e8 03 <80> 3c 10 00 74 26 4c 89 0c 24 48 89 df 49 89 f5 4d 89 c6 e8 d5 b7
RSP: 0018:ffffc90003327390 EFLAGS: 00000a02
RAX: 1ffff92000664e98 RBX: ffffc900033274c0 RCX: ffffffff919a7000
RDX: dffffc0000000000 RSI: ffffffff821d2306 RDI: ffffc900033274cc
RBP: ffffc900033274c8 R08: 0000000000000000 R09: ffffc900033274d0
R10: ffffc90003327430 R11: ffffffff81aeea80 R12: 1ffff92000664e99
R13: 1ffff92000664e99 R14: 0000000000000000 R15: 1ffff92000664e9a
arch_stack_walk+0x110/0x150 arch/x86/kernel/stacktrace.c:27
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_kmalloc+0x23/0xb0 mm/kasan/common.c:385
kasan_kmalloc include/linux/kasan.h:260 [inline]
__kmalloc_cache_noprof+0x236/0x370 mm/slub.c:4349
kmalloc_noprof include/linux/slab.h:902 [inline]
__kthread_create_on_node+0xf4/0x3e0 kernel/kthread.c:511
kthread_create_on_node+0xe0/0x130 kernel/kthread.c:588
create_worker+0x2a8/0x730 kernel/workqueue.c:2802
maybe_create_worker kernel/workqueue.c:3063 [inline]
manage_workers kernel/workqueue.c:3115 [inline]
worker_thread+0x318/0xd30 kernel/workqueue.c:3375
kthread+0x7a9/0x920 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
task:syz-executor state:R running task stack:21456 pid:5846 tgid:5846 ppid:5826 task_flags:0x400140 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5366 [inline]
__schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6926
preempt_schedule+0xe4/0xf0 kernel/sched/core.c:6950
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
unwind_next_frame+0x1911/0x22f0 arch/x86/kernel/unwind_orc.c:672
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+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]
kmem_cache_alloc_noprof+0x1e1/0x390 mm/slub.c:4194
getname_flags+0xb6/0x530 fs/namei.c:146
getname include/linux/fs.h:2844 [inline]
getname_maybe_null include/linux/fs.h:2851 [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: 0033:0x7ffa6558b97a
RSP: 002b:00007ffa658cecb8 EFLAGS: 00000286 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007ffa6560e08c RCX: 00007ffa6558b97a
RDX: 00007ffa658cece0 RSI: 00007ffa658ced70 RDI: 00000000ffffff9c
RBP: 00007ffa658ced70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000286 R12: 00007ffa658cfe00
R13: 00007ffa6560e08c R14: 000000000001cff0 R15: 00007ffa658cfe40
task:udevd state:R running task stack:22760 pid:5206 tgid:5206 ppid:1 task_flags:0x400140 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5366 [inline]
__schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6926
preempt_schedule+0xe4/0xf0 kernel/sched/core.c:6950
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
unwind_next_frame+0x1911/0x22f0 arch/x86/kernel/unwind_orc.c:672
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+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]
kzalloc_noprof include/linux/slab.h:1036 [inline]
tomoyo_encode2 security/tomoyo/realpath.c:45 [inline]
tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80
tomoyo_realpath_from_path+0x59e/0x5e0 security/tomoyo/realpath.c:283
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x2be/0x640 security/tomoyo/file.c:822
security_inode_getattr+0x130/0x330 security/security.c:2377
vfs_getattr fs/stat.c:243 [inline]
vfs_statx_path+0x23/0x2b0 fs/stat.c:283
vfs_statx+0x13a/0x200 fs/stat.c:349
vfs_fstatat+0xdc/0x150 fs/stat.c:368
__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: 0033:0x7f2c08d165f4
RSP: 002b:00007ffd830c2bd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 000055ce51b08c20 RCX: 00007f2c08d165f4
RDX: 00007ffd830c2be8 RSI: 000055ce4452a302 RDI: 00000000ffffff9c
RBP: 000055ce51af8910 R08: 00000000ffffffff R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 000055ce4453e5e8
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 8305 jiffies! g14449 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:26976 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5366 [inline]
__schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
__schedule_loop kernel/sched/core.c:6824 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6839
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+0x7a9/0x920 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 6.14.0-syzkaller-03576-g1e1ba8d23dae #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:arch_stack_walk+0x125/0x150 arch/x86/kernel/stacktrace.c:24
Code: 31 c6 09 00 48 85 c0 74 23 4c 89 f7 48 89 c6 4d 89 eb 41 ff d3 66 90 84 c0 74 11 48 89 df e8 62 c7 09 00 83 bd 70 ff ff ff 00 <75> d0 48 c7 c0 20 c0 3f 93 65 48 8b 00 48 3b 45 d0 75 13 48 83 c4
RSP: 0018:ffffc90000a07ba0 EFLAGS: 00000202
RAX: 0000000080000101 RBX: ffffc90000a07ba0 RCX: 0000000080000101
RDX: dffffc0000000000 RSI: ffffc90000a01000 RDI: 0000000000000001
RBP: ffffc90000a07c30 R08: ffffc90000a08790 R09: 0000000000000000
R10: ffffc90000a07bf0 R11: fffff52000140f80 R12: ffff88801d295a00
R13: ffffffff81aeea80 R14: ffffc90000a07c80 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125324000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555571cb15c8 CR3: 000000005e844000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
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
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2376 [inline]
slab_free mm/slub.c:4633 [inline]
kmem_cache_free+0x197/0x410 mm/slub.c:4735
skb_kfree_head net/core/skbuff.c:994 [inline]
skb_free_head net/core/skbuff.c:1008 [inline]
skb_release_data+0x67a/0x8b0 net/core/skbuff.c:1035
skb_release_all net/core/skbuff.c:1100 [inline]
__kfree_skb net/core/skbuff.c:1114 [inline]
consume_skb+0x9f/0xf0 net/core/skbuff.c:1346
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:240 [inline]
nft_do_chain+0x4b2/0x1db0 net/netfilter/nf_tables_core.c:288
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:5896 [inline]
__netif_receive_skb+0x2c9/0x670 net/core/dev.c:6009
process_backlog+0x664/0x15c0 net/core/dev.c:6357
__napi_poll+0xcb/0x490 net/core/dev.c:7190
napi_poll net/core/dev.c:7259 [inline]
net_rx_action+0x89d/0x1240 net/core/dev.c:7381
handle_softirqs+0x2d6/0x9b0 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 66 90 0f 00 2d b5 1a 6f 00 f3 0f 1e fa fb f4 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197d08 EFLAGS: 00000246
RAX: ffff88801d295a00 RBX: ffff888020a82064 RCX: ffffffff8c1b47ac
RDX: 0000000000000001 RSI: ffff888020a82000 RDI: ffff888020a82064
RBP: ffffffff93411c78 R08: ffff8880b8732b5b R09: 1ffff110170e656b
R10: dffffc0000000000 R11: ffffffff8c1b6280 R12: ffff8881456ae000
R13: 0000000000000001 R14: 0000000000000001 R15: ffffffff8f338d40
acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:701
cpuidle_enter_state+0x111/0x480 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