rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8778/1:b..l
(detected by 1, t=10502 jiffies, g=46249, q=209 ncpus=2)
task:syz.5.1106 state:R running task stack:21640 pid:8778 ppid:5191 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5243 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6560
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872
irqentry_exit+0x53/0x80 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_acquire+0x33/0x5a0 kernel/locking/lockdep.c:5630
Code: 55 41 54 53 48 83 e4 e0 48 81 ec 20 01 00 00 4c 89 4c 24 28 4c 89 44 24 38 48 89 4c 24 30 89 54 24 1c 41 89 f6 48 89 7c 24 20 <65> 48 8b 04 25 28 00 00 00 48 89 84 24 00 01 00 00 49 bd 00 00 00
RSP: 0018:ffffc900036f6de0 EFLAGS: 00000282
RAX: 0000000000000001 RBX: ffff88807c584010 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8d32e6c0
RBP: ffffc900036f6f30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff920006dedf0 R14: 0000000000000000 R15: ffffc900036f7120
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
percpu_ref_put_many include/linux/percpu-refcount.h:330 [inline]
percpu_ref_put+0x36/0x180 include/linux/percpu-refcount.h:351
__mem_cgroup_uncharge_list+0xba/0x150 mm/memcontrol.c:7142
mem_cgroup_uncharge_list include/linux/memcontrol.h:699 [inline]
release_pages+0x24bc/0x27a0 mm/swap.c:1034
__pagevec_release+0x80/0xf0 mm/swap.c:1055
pagevec_release include/linux/pagevec.h:71 [inline]
folio_batch_release include/linux/pagevec.h:135 [inline]
shmem_undo_range+0x865/0x2390 mm/shmem.c:946
shmem_truncate_range mm/shmem.c:1062 [inline]
shmem_evict_inode+0x265/0xa60 mm/shmem.c:1171
evict+0x529/0x930 fs/inode.c:705
__dentry_kill+0x436/0x650 fs/dcache.c:611
dentry_kill+0xbb/0x290
dput+0xfb/0x1d0 fs/dcache.c:918
__fput+0x62e/0x8d0 fs/file_table.c:328
task_work_run+0x246/0x300 kernel/task_work.c:203
exit_task_work include/linux/task_work.h:39 [inline]
do_exit+0xa6e/0x26a0 kernel/exit.c:871
do_group_exit+0x202/0x2b0 kernel/exit.c:1021
get_signal+0x16cb/0x17a0 kernel/signal.c:2871
arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:316
exc_page_fault+0x1c0/0x620 arch/x86/mm/fault.c:1490
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f008f38d171
RSP: 002b:0000000000000030 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f008f5a6080 RCX: 00007f008f38d169
RDX: 0000000000000000 RSI: 0000000000000030 RDI: 0000000000000600
RBP: 00007f008f40e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f008f5a6080 R15: 00007ffc0a0c2198
rcu: rcu_preempt kthread starved for 10428 jiffies! g46249 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:26080 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5243 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6560
schedule+0xbf/0x180 kernel/sched/core.c:6636
schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8907 Comm: syz.9.1148 Not tainted 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:debug_smp_processor_id+0x0/0x10 lib/smp_processor_id.c:60
Code: 48 89 de e8 12 5e bd f9 e9 64 ff ff ff 48 c7 c7 20 d5 3c 8d 48 89 de e8 fe 5d bd f9 e9 6d ff ff ff cc cc cc cc cc cc cc cc cc <48> c7 c7 20 6f 5f 8b 48 c7 c6 60 6f 5f 8b eb 00 41 57 41 56 41 54
RSP: 0018:ffffc90000007ad8 EFLAGS: 00000087
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff816ab44b
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ea0b468
RBP: ffffc90000007c48 R08: dffffc0000000000 R09: fffffbfff1d4168e
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000000f68
R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 00007f4aa21f56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 00000000590ea000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
rcu_is_watching+0x11/0xb0 kernel/rcu/tree.c:721
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0xfa/0x5a0 kernel/locking/lockdep.c:5633
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
posix_timer_fn+0x2f/0x390 kernel/time/posix-timers.c:379
__run_hrtimer kernel/time/hrtimer.c:1689 [inline]
__hrtimer_run_queues+0x5e5/0xe50 kernel/time/hrtimer.c:1753
hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1815
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x158/0x5b0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: a1 84 f5 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 8e dc ae f6 48 89 df e8 f6 1a b0 f6 e8 51 6d d5 f6 fb bf 01 00 00 00 d6 9b a2 f6 65 8b 05 f7 71 46 75 85 c0 74 02 5b c3 e8 94 95 44
RSP: 0018:ffffc90004477b30 EFLAGS: 00000286
RAX: e9e5456227737b00 RBX: ffff88802f8cb780 RCX: ffffffff973c0103
RDX: dffffc0000000000 RSI: ffffffff8b0c1d40 RDI: 0000000000000001
RBP: ffffc90004477c70 R08: dffffc0000000000 R09: ffffed1005f196f1
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11005f19783
R13: 000000001c000004 R14: 0000000000000021 R15: ffff88802f8cbc18
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x151f/0x17a0 kernel/signal.c:2874
arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4aa138d167
Code: ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89
RSP: 002b:00007f4aa21f50e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f4aa15a5fa8 RCX: 00007f4aa138d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4aa15a5fa8
RBP: 00007f4aa15a5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4aa15a5fac
R13: 0000000000000000 R14: 00007ffe37081480 R15: 00007ffe37081568