rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P13140/1:b..l P12864/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=68045, q=696 ncpus=2)
task:syz.2.1663 state:R running task stack:23352 pid:12864 tgid:12864 ppid:5605 task_flags:0x40064c flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7606
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa10 kernel/entry/common.c:167
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:679
RIP: 0010:lock_acquire+0x5e/0x380 kernel/locking/lockdep.c:5947
Code: 05 cf aa a5 12 83 f8 07 0f 87 da 00 00 00 48 0f a3 05 de e7 5d 0f 0f 82 c9 02 00 00 8b 35 7e 19 5e 0f 85 f6 0f 85 c7 00 00 00 <48> 8b 44 24 30 65 48 2b 05 6d aa a5 12 0f 85 09 03 00 00 48 83 c4
RSP: 0018:ffffc90003416ea8 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e36911a RDI: ffffffff8c623a80
RBP: ffffffff8edec5a0 R08: 00000000ef9d33e4 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x162/0x1e0 mm/page_owner.c:183
__reset_page_owner+0x84/0x190 mm/page_owner.c:338
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
free_unref_folios+0xa4a/0x1790 mm/page_alloc.c:3022
folios_put_refs+0x585/0xaa0 mm/folio.c:1036
folio_batch_release include/linux/folio_batch.h:101 [inline]
shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1161
shmem_truncate_range mm/shmem.c:1289 [inline]
shmem_evict_inode+0x3b1/0xca0 mm/shmem.c:1420
evict+0x3c2/0xad0 fs/inode.c:822
iput_final fs/inode.c:2014 [inline]
iput.part.0+0x989/0x1050 fs/inode.c:2063
iput+0x35/0x40 fs/inode.c:2029
dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
dentry_kill+0x25d/0xc20 fs/dcache.c:826
finish_dput fs/dcache.c:1001 [inline]
dput.part.0+0xd7/0x240 fs/dcache.c:1042
dput+0x1f/0x30 fs/dcache.c:1037
__fput+0x519/0xb50 fs/file_table.c:520
task_work_run+0x150/0x240 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x8da/0x2a50 kernel/exit.c:986
do_group_exit+0xd5/0x2a0 kernel/exit.c:1129
get_signal+0x1ec7/0x21e0 kernel/signal.c:3112
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop kernel/entry/common.c:101 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
irqentry_exit+0x402/0xa10 kernel/entry/common.c:165
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f033259e161
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f0332826090 RCX: 00007f033259e159
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f033263506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f0332826128 R14: 00007f0332826090 R15: 00007ffe8e037208
task:udevd state:R running task stack:27608 pid:13140 tgid:13140 ppid:4975 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
preempt_schedule_notrace+0x57/0xd0 kernel/sched/core.c:7556
preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13
rcu_is_watching+0x90/0xc0 kernel/rcu/tree.c:754
trace_lock_release include/trace/events/lock.h:68 [inline]
lock_release+0x24d/0x310 kernel/locking/lockdep.c:5954
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0x3c3/0x2090 arch/x86/kernel/unwind_orc.c:495
__unwind_start+0x3cd/0x7e0 arch/x86/kernel/unwind_orc.c:787
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0x73/0xf0 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:264 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:296
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2748 [inline]
slab_free mm/slub.c:6509 [inline]
kfree+0x22b/0x6d0 mm/slub.c:6802
tomoyo_realpath_from_path+0x19c/0x690 security/tomoyo/realpath.c:286
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path2_perm+0x29f/0x700 security/tomoyo/file.c:927
tomoyo_path_rename+0xfc/0x1a0 security/tomoyo/tomoyo.c:300
security_path_rename+0x18e/0x3c0 security/security.c:1544
filename_renameat2+0x731/0xa60 fs/namei.c:6321
__do_sys_rename fs/namei.c:6370 [inline]
__se_sys_rename fs/namei.c:6366 [inline]
__x64_sys_rename+0x81/0xb0 fs/namei.c:6366
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f76c7e7acc7
RSP: 002b:00007ffd507213c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0000558e9b472b20 RCX: 00007f76c7e7acc7
RDX: 0000558e9b220010 RSI: 00007ffd507213e0 RDI: 00007ffd507217e0
RBP: 0000558e9b466320 R08: 00000000000001e0 R09: 0000000000000000
R10: 00000000000001b6 R11: 0000000000000206 R12: 00007ffd507213e0
R13: 00007ffd507217e0 R14: 0000558e92def100 R15: 0000558e92def140
rcu: rcu_preempt kthread starved for 10502 jiffies! g68045 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27560 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7376
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x8f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x17a/0x220 kernel/rcu/tree.c:2330
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:mark_lock+0x51/0x1020 kernel/locking/lockdep.c:4775
Code: 68 89 d3 83 fa 08 74 70 41 bc 01 00 00 00 89 d9 41 d3 e4 4d 63 e4 41 0f b7 47 20 66 25 ff 1f 0f b7 c0 48 0f a3 05 ef a5 aa 14 <73> 5f 48 8d 04 80 48 8d 04 80 48 8d 04 c5 a0 ed 91 96 4c 89 e1 48
RSP: 0018:ffffc90000a18be0 EFLAGS: 00000003
RAX: 0000000000000007 RBX: 0000000000000009 RCX: 0000000000000001
RDX: 0000000000000008 RSI: ffff88801f6856d8 RDI: ffff88801f684b00
RBP: ffffc90000a18c80 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000200
R13: 0000000000020000 R14: ffff88801f684b00 R15: ffff88801f6856d8
FS: 0000000000000000(0000) GS:ffff888123c4e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7f06d87780 CR3: 00000000725ec000 CR4: 00000000003526f0
Call Trace:
mark_usage kernel/locking/lockdep.c:4718 [inline]
__lock_acquire+0x5c0/0x1f40 kernel/locking/lockdep.c:5242
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
advance_sched+0x718/0xd20 net/sched/sch_taprio.c:993
__run_hrtimer kernel/time/hrtimer.c:2074 [inline]
__hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2131
hrtimer_interrupt+0x441/0xaa0 kernel/time/hrtimer.c:2250
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
__sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:sched_core_balance+0xa7/0xff0 kernel/sched/core.c:6578
Code: 00 e8 3d 7c fa 09 41 5b 85 c0 0f 85 3d 0b 00 00 e9 01 0a 00 00 49 8d 7c 24 48 e8 34 75 fd 09 e8 ff 49 3c 00 fb 48 63 44 24 58 <48> c7 c3 00 df 8e 94 48 89 dd 48 89 44 24 08 48 83 f8 08 0f 83 6c
RSP: 0018:ffffc900001a7b70 EFLAGS: 00000206
RAX: 0000000000000001 RBX: ffff88801f684b00 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff8e38f5e4 RDI: ffffffff8c623a80
RBP: ffffc900001a7c90 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880b853bf00
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8880b853bf00
do_balance_callbacks kernel/sched/core.c:5157 [inline]
__balance_callbacks kernel/sched/core.c:5213 [inline]
finish_lock_switch kernel/sched/core.c:5262 [inline]
finish_task_switch.isra.0+0x535/0x10d0 kernel/sched/core.c:5382
context_switch kernel/sched/core.c:5536 [inline]
__schedule+0x1261/0x6920 kernel/sched/core.c:7284
schedule_idle+0x54/0x80 kernel/sched/core.c:7402
do_idle+0x365/0x5b0 kernel/sched/idle.c:384
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:454
start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x158