rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9339/1:b..l P9335/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=33825, q=382 ncpus=2)
task:syz.3.943 state:R running task stack:22368 pid:9335 tgid:9335 ppid:5799 task_flags:0x400840 flags:0x0008000a
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_is_held_type+0x45/0x150 kernel/locking/lockdep.c:-1
Code: 84 e4 00 00 00 65 8b 05 b9 b1 2b 07 85 c0 0f 85 d5 00 00 00 65 4c 8b 2d 01 6b 2b 07 41 83 bd b4 0b 00 00 00 0f 85 bf 00 00 00 <89> f5 49 89 fe 9c 41 5c fa 48 c7 c7 67 9b 57 8d e8 a6 18 00 00 65
RSP: 0018:ffffc900046a7080 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: 0000000080000001
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8ddcb980
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed102808aa2b R12: 0000000000000000
R13: ffff88802ee68000 R14: 0000000000000000 R15: 0000000000000000
css_next_descendant_pre+0x32/0x260 kernel/cgroup/cgroup.c:4819
mem_cgroup_iter+0x1dc/0x450 mm/memcontrol.c:1062
shrink_node_memcgs mm/vmscan.c:5981 [inline]
shrink_node+0xeb6/0x2950 mm/vmscan.c:6061
shrink_zones mm/vmscan.c:6300 [inline]
do_try_to_free_pages+0x6ed/0x1980 mm/vmscan.c:6362
try_to_free_mem_cgroup_pages+0x2eb/0x840 mm/vmscan.c:6683
try_charge_memcg+0x859/0x1630 mm/memcontrol.c:2414
obj_cgroup_charge_pages mm/memcontrol.c:2857 [inline]
__memcg_kmem_charge_page+0x2dd/0x460 mm/memcontrol.c:2901
memcg_kmem_charge_page include/linux/memcontrol.h:1725 [inline]
memcg_charge_kernel_stack+0x2f5/0x4e0 kernel/fork.c:318
alloc_thread_stack_node kernel/fork.c:362 [inline]
dup_task_struct+0x290/0x9a0 kernel/fork.c:924
copy_process+0x508/0x3cd0 kernel/fork.c:2050
kernel_clone+0x249/0x840 kernel/fork.c:2653
__do_sys_clone3 kernel/fork.c:2955 [inline]
__se_sys_clone3+0x33c/0x360 kernel/fork.c:2934
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3c80a0d589
RSP: 002b:00007fffbaa5aeb8 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007f3c809c8b20 RCX: 00007f3c80a0d589
RDX: 00007f3c809c8b20 RSI: 0000000000000058 RDI: 00007fffbaa5af10
RBP: 00007f3c7ec3d6c0 R08: 00007f3c7ec3d6c0 R09: 00007fffbaa5aff7
R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffe8
R13: 000000000000006e R14: 00007fffbaa5af10 R15: 00007fffbaa5aff8
task:syz.3.943 state:R running task stack:22152 pid:9339 tgid:9335 ppid:5799 task_flags:0x400940 flags:0x0008000a
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x2d7/0x3d0 kernel/locking/lockdep.c:5893
Code: 1d ae 10 00 00 00 00 eb b5 e8 a5 69 82 09 f7 c3 00 02 00 00 74 b9 65 48 8b 05 15 d7 ad 10 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 72 f9 cc
RSP: 0018:ffffc9000e1e6e60 EFLAGS: 00000286
RAX: 94b764f70f709400 RBX: 0000000000000202 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8d7bd2ec RDI: ffffffff8ba66700
RBP: ffff88806a6daa38 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000406 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8ddcb980 R15: ffff88806a6d9e80
rcu_lock_release include/linux/rcupdate.h:322 [inline]
rcu_read_unlock include/linux/rcupdate.h:881 [inline]
list_lru_count_one+0x252/0x2d0 mm/list_lru.c:261
list_lru_shrink_count include/linux/list_lru.h:190 [inline]
super_cache_count+0x1a7/0x240 fs/super.c:266
do_shrink_slab+0x91/0x1170 mm/shrinker.c:384
shrink_slab_memcg mm/shrinker.c:550 [inline]
shrink_slab+0x830/0x1150 mm/shrinker.c:628
shrink_node_memcgs mm/vmscan.c:6022 [inline]
shrink_node+0x124d/0x2950 mm/vmscan.c:6061
shrink_zones mm/vmscan.c:6300 [inline]
do_try_to_free_pages+0x6ed/0x1980 mm/vmscan.c:6362
try_to_free_mem_cgroup_pages+0x2eb/0x840 mm/vmscan.c:6683
try_charge_memcg+0x859/0x1630 mm/memcontrol.c:2414
obj_cgroup_charge_pages mm/memcontrol.c:2857 [inline]
__memcg_kmem_charge_page+0x2dd/0x460 mm/memcontrol.c:2901
__alloc_frozen_pages_noprof+0x1c1/0x380 mm/page_alloc.c:5267
__alloc_pages_noprof mm/page_alloc.c:5284 [inline]
alloc_pages_bulk_noprof+0x5f1/0x7d0 mm/page_alloc.c:5204
alloc_pages_bulk_node_noprof include/linux/gfp.h:259 [inline]
io_region_allocate_pages+0x175/0x470 io_uring/memmap.c:170
io_create_region+0x37a/0x4a0 io_uring/memmap.c:220
io_allocate_scq_urings+0x220/0x820 io_uring/io_uring.c:2703
io_uring_create+0x46b/0x980 io_uring/io_uring.c:3006
io_uring_setup io_uring/io_uring.c:3076 [inline]
__do_sys_io_uring_setup io_uring/io_uring.c:3110 [inline]
__se_sys_io_uring_setup+0x2a8/0x2c0 io_uring/io_uring.c:3101
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3c80a0c799
RSP: 002b:00007f3c7ec5dfb8 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 00007f3c80c85fa0 RCX: 00007f3c80a0c799
RDX: 0000200000000140 RSI: 0000200000000180 RDI: 0000000000000837
RBP: 0000200000000180 R08: 0000000000000000 R09: 0000200000000140
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000837 R15: 0000200000000140
rcu: rcu_preempt kthread starved for 10502 jiffies! g33825 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:27776 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 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:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: 6e 5d 02 e9 13 c4 03 00 cc cc cc 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 f3 9c 26 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8da07dc0 EFLAGS: 00000246
RAX: 0000000000de03f3 RBX: ffffffff81996dba RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8d560c6d RDI: ffffffff8ba66700
RBP: ffffffff8da07eb0 R08: ffff8880b8833f1b R09: 1ffff110171067e3
R10: dffffc0000000000 R11: ffffed10171067e4 R12: ffffffff8f6a3bb0
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1b605d8
FS: 0000000000000000(0000) GS:ffff88812633c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5f36c356b8 CR3: 00000000745fe000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:766 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x1ba/0x5d0 kernel/sched/idle.c:341
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:439
rest_init+0x2de/0x300 init/main.c:760
start_kernel+0x385/0x3d0 init/main.c:1210
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x147