rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P17199/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=78981, q=2100 ncpus=2)
task:syz.0.2725 state:R running task stack:22392 pid:17199 tgid:17193 ppid:14410 task_flags:0x400940 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7193
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0x44/0x3b0 kernel/locking/lockdep.c:5879
Code: 8b 05 b0 11 01 11 48 89 44 24 28 0f 1f 44 00 00 65 8b 05 b3 11 01 11 83 f8 08 0f 83 87 02 00 00 89 c0 48 0f a3 05 dc 90 03 0e <73> 0d e8 f5 f8 08 00 84 c0 0f 84 a3 02 00 00 83 3d f6 c0 03 0e 00
RSP: 0018:ffffc9000c52e070 EFLAGS: 00000297
RAX: 0000000000000001 RBX: ffffffff9043c801 RCX: 1cd19fdead356d00
RDX: ffffc9000c52e101 RSI: ffffffff81742f85 RDI: ffffffff8e13f2e0
RBP: dffffc0000000000 R08: ffffc9000c52e418 R09: 0000000000000000
R10: ffffc9000c52e1f8 R11: fffff520018a5c41 R12: ffffc9000c52e428
R13: ffffffff81742f85 R14: ffffffff8e13f2e0 R15: ffffffff81742f85
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:897 [inline]
class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0x1ab1/0x23d0 arch/x86/kernel/unwind_orc.c:695
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
save_stack+0xf5/0x1f0 mm/page_owner.c:165
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1406 [inline]
free_unref_folios+0xdb3/0x14f0 mm/page_alloc.c:3000
shrink_folio_list+0x289b/0x4f90 mm/vmscan.c:1534
evict_folios+0x473e/0x57f0 mm/vmscan.c:4711
try_to_shrink_lruvec+0x8a3/0xb50 mm/vmscan.c:4874
lru_gen_shrink_lruvec mm/vmscan.c:5023 [inline]
shrink_lruvec+0x49c/0x2980 mm/vmscan.c:5784
shrink_node_memcgs mm/vmscan.c:6020 [inline]
shrink_node+0xaa9/0x35b0 mm/vmscan.c:6061
shrink_zones mm/vmscan.c:6300 [inline]
do_try_to_free_pages+0x668/0x1960 mm/vmscan.c:6362
try_to_free_mem_cgroup_pages+0x2ea/0x7a0 mm/vmscan.c:6690
try_charge_memcg+0xa2d/0x1280 mm/memcontrol.c:2388
obj_cgroup_charge_pages mm/memcontrol.c:2823 [inline]
__memcg_kmem_charge_page+0xe1/0x240 mm/memcontrol.c:2867
__alloc_frozen_pages_noprof+0x1b5/0x370 mm/page_alloc.c:5227
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline]
alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2577
io_mem_alloc_compound io_uring/memmap.c:30 [inline]
io_region_allocate_pages+0xf3/0x470 io_uring/memmap.c:165
io_create_region+0x37a/0x4a0 io_uring/memmap.c:220
io_allocate_scq_urings+0x3f7/0x790 io_uring/io_uring.c:3392
io_uring_create+0x42b/0x940 io_uring/io_uring.c:3643
io_uring_setup io_uring/io_uring.c:3718 [inline]
__do_sys_io_uring_setup io_uring/io_uring.c:3752 [inline]
__se_sys_io_uring_setup+0x235/0x240 io_uring/io_uring.c:3743
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa0ad8f749
RSP: 002b:00007ffa0bd0efc8 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 00007ffa0afe5fa0 RCX: 00007ffa0ad8f749
RDX: 0000200000000080 RSI: 00002000000000c0 RDI: 00000000000008d2
RBP: 00002000000000c0 R08: 0000000000000000 R09: 0000200000000080
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00002000000001c0 R14: 00000000000008d2 R15: 0000200000000080
rcu: rcu_preempt kthread starved for 9954 jiffies! g78981 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:27160 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
__schedule_loop kernel/sched/core.c:6948 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6963
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc 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 33 9e 2a 00 f3 0f 1e fa fb f4 48 ee 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6
RAX: 036d9d200b785a00 RBX: ffffffff819786ba RCX: 036d9d200b785a00
RDX: 0000000000000001 RSI: ffffffff8d997e54 RDI: ffffffff8be07960
RBP: ffffc90000197f10 R08: ffff8880b87336db R09: 1ffff110170e66db
R10: dffffc0000000000 R11: ffffed10170e66dc R12: ffffffff8fa22f70
R13: 1ffff11003ad6b70 R14: 0000000000000001 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888125d25000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a76e2ace70 CR3: 000000007e9b0000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x1ea/0x520 kernel/sched/idle.c:332
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x147