rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P10346/1:b..l
	(detected by 1, t=10502 jiffies, g=98669, q=45 ncpus=2)
task:syz-executor    state:R  running task     stack:21920 pid:10346 ppid:10334  flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:cpu_max_bits_warn include/linux/cpumask.h:110 [inline]
RIP: 0010:cpumask_check include/linux/cpumask.h:117 [inline]
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:444 [inline]
RIP: 0010:cpu_online include/linux/cpumask.h:1030 [inline]
RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0xa1/0x910 kernel/locking/lockdep.c:5673
Code: 43 c6 44 2f 0b f3 0f 1f 44 00 00 65 8b 1d 57 b1 9e 7e 48 c7 c0 30 84 fe 8d 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 af 05 00 00 <3b> 1d c9 1b 9b 0c 0f 83 22 05 00 00 41 89 de c1 eb 06 48 8d 3c dd
RSP: 0018:ffffc90004e17540 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 346aae7262f28700
RDX: 0000000000000000 RSI: ffffffff81d98055 RDI: ffffffff8c92a960
RBP: ffffc90004e17650 R08: dffffc0000000000 R09: fffffbfff2117049
R10: fffffbfff2117049 R11: 1ffffffff2117048 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88802be05100 R15: 1ffff920009c2eb4
 rcu_lock_release include/linux/rcupdate.h:355 [inline]
 rcu_read_unlock include/linux/rcupdate.h:824 [inline]
 percpu_ref_tryget_many include/linux/percpu-refcount.h:250 [inline]
 percpu_ref_tryget+0xfd/0x180 include/linux/percpu-refcount.h:266
 obj_cgroup_tryget include/linux/memcontrol.h:779 [inline]
 __get_obj_cgroup_from_memcg+0x70/0xe0 mm/memcontrol.c:3006
 get_obj_cgroup_from_current+0x16b/0x280 mm/memcontrol.c:3026
 memcg_slab_pre_alloc_hook mm/slab.h:485 [inline]
 slab_pre_alloc_hook+0x91/0x310 mm/slab.h:715
 slab_alloc_node mm/slub.c:3318 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc+0x56/0x2f0 mm/slub.c:3422
 anon_vma_chain_alloc mm/rmap.c:141 [inline]
 anon_vma_clone+0xb4/0x4e0 mm/rmap.c:287
 anon_vma_fork+0x75/0x4f0 mm/rmap.c:350
 dup_mmap kernel/fork.c:663 [inline]
 dup_mm kernel/fork.c:1541 [inline]
 copy_mm+0xb44/0x15c0 kernel/fork.c:1590
 copy_process+0x1947/0x4060 kernel/fork.c:2266
 kernel_clone+0x225/0x8b0 kernel/fork.c:2681
 __do_sys_clone kernel/fork.c:2822 [inline]
 __se_sys_clone kernel/fork.c:2806 [inline]
 __x64_sys_clone+0x17c/0x1d0 kernel/fork.c:2806
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7febfcd851d3
RSP: 002b:00007ffc9d5fab98 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007febfcd851d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 000055558697c7d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000008bcbf R15: 00007ffc9d5fad30
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10537 jiffies! g98669 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=43633
rcu: rcu_preempt kthread starved for 10543 jiffies! g98669 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26912 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.1.138-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:736
Code: 48 89 df e8 c7 1a b9 f7 e9 4c ff ff ff e8 4d 14 f6 ff 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 66 90 0f 00 2d b7 72 4d 00 fb f4 <c3> 0f 1f 40 00 41 57 41 56 53 49 be 00 00 00 00 00 fc ff df 65 48
RSP: 0018:ffffc90000177de8 EFLAGS: 000002c6
RAX: 308c4a81eeb50e00 RBX: ffffffff8a1930d7 RCX: 308c4a81eeb50e00
RDX: 0000000000000001 RSI: ffffffff8a6bfe00 RDI: ffffffff8abf0da0
RBP: ffffc90000177f20 R08: dffffc0000000000 R09: ffffed10171e6aee
R10: ffffed10171e6aee R11: 1ffff110171e6aed R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88813fef1dc0 R15: 1ffffffff1bfd086
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ff15ff8 CR3: 000000006429b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 default_idle_call+0x84/0xc0 kernel/sched/idle.c:109
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1fc/0x570 kernel/sched/idle.c:303
 cpu_startup_entry+0x3f/0x60 kernel/sched/idle.c:401
 start_secondary+0xe4/0xf0 arch/x86/kernel/smpboot.c:281
 secondary_startup_64_no_verify+0xcf/0xdb
 </TASK>