rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4537/2:b..l
	(detected by 1, t=10502 jiffies, g=8505, q=245)
task:syz-executor.4  state:R  running task     stack:21856 pid: 4537 ppid:  4514 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6780
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_acquire+0x1f2/0x3f0 kernel/locking/lockdep.c:5627
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f6 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b
RSP: 0018:ffffc9000334f680 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 2d2a9589f7c0f400
RDX: 0000000000000000 RSI: ffffffff8a0b2860 RDI: ffffffff8a599340
RBP: ffffc9000334f790 R08: dffffc0000000000 R09: fffffbfff1ff6e19
R10: fffffbfff1ff6e19 R11: 1ffffffff1ff6e18 R12: ffffffff8c11c360
R13: 1ffff92000669edc R14: 0000000000000246 R15: dffffc0000000000
 rcu_lock_acquire+0x20/0x30 include/linux/rcupdate.h:312
 rcu_read_lock include/linux/rcupdate.h:739 [inline]
 percpu_ref_tryget_many include/linux/percpu-refcount.h:241 [inline]
 percpu_ref_tryget+0x12/0x150 include/linux/percpu-refcount.h:266
 obj_cgroup_tryget include/linux/memcontrol.h:800 [inline]
 get_obj_cgroup_from_current+0x21a/0x2f0 mm/memcontrol.c:2930
 memcg_slab_pre_alloc_hook mm/slab.h:283 [inline]
 slab_pre_alloc_hook+0x7e/0xc0 mm/slab.h:497
 slab_alloc_node mm/slub.c:3134 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 kmem_cache_alloc+0x3d/0x290 mm/slub.c:3233
 anon_vma_chain_alloc mm/rmap.c:138 [inline]
 anon_vma_clone+0xbd/0x4f0 mm/rmap.c:284
 anon_vma_fork+0x7e/0x500 mm/rmap.c:347
 dup_mmap kernel/fork.c:574 [inline]
 dup_mm kernel/fork.c:1466 [inline]
 copy_mm+0x9e3/0x1370 kernel/fork.c:1518
 copy_process+0x17c6/0x3e00 kernel/fork.c:2290
 kernel_clone+0x219/0x930 kernel/fork.c:2679
 __do_sys_clone kernel/fork.c:2796 [inline]
 __se_sys_clone kernel/fork.c:2780 [inline]
 __x64_sys_clone+0x170/0x1c0 kernel/fork.c:2780
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fe2349b3d13
RSP: 002b:00007ffde1fee558 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe2349b3d13
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000555576918750 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10534 jiffies! g8505 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:26688 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1e0 kernel/sched/core.c:6459
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
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: 4894 Comm: syz-executor.2 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:check_preemption_disabled+0x18/0x110 lib/smp_processor_id.c:14
Code: 00 cc 48 c7 c7 e0 92 59 8a 48 c7 c6 20 93 59 8a eb 00 55 41 57 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 <65> 8b 05 a9 d7 59 76 65 8b 0d 12 32 5a 76 f7 c1 ff ff ff 7f 74 1f
RSP: 0018:ffffc90002fafe20 EFLAGS: 00000082
RAX: b705e3ba3f9dce00 RBX: 000000000000052e RCX: 0000000000000001
RDX: 1ffffffff1dd9800 RSI: ffffffff8a599320 RDI: ffffffff8a5992e0
RBP: 000000000000052e R08: ffffffff8eecc008 R09: ffffffff8eecc018
R10: ffffffff8eecc010 R11: ffffffff8eecc003 R12: 1ffff110044f50ea
R13: dffffc0000000000 R14: ffff8880227a8000 R15: 000000000000052e
FS:  00007f890d8be6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f890d8bdd80 CR3: 0000000028075000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 steal_account_process_time kernel/sched/cputime.c:241 [inline]
 account_other_time+0x125/0x280 kernel/sched/cputime.c:262
 get_vtime_delta kernel/sched/cputime.c:662 [inline]
 vtime_user_exit+0xfa/0x400 kernel/sched/cputime.c:726
 __context_tracking_exit+0x4c/0x80 kernel/context_tracking.c:160
 user_exit_irqoff include/linux/context_tracking.h:47 [inline]
 __enter_from_user_mode kernel/entry/common.c:22 [inline]
 syscall_enter_from_user_mode+0x56/0x70 kernel/entry/common.c:110
 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f890e500139
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007f890d8bdbc0 EFLAGS: 00000202 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f890e65bf88 RCX: 00007f890e500139
RDX: 00007f890d8bdbc0 RSI: 00007f890d8bdcf0 RDI: 0000000000000021
RBP: 00007f890e65bf80 R08: 00007f890d8be6c0 R09: 00007f890d8be6c0
R10: 0000000000000000 R11: 0000000000000202 R12: 00007f890e65bf8c
R13: 000000000000000b R14: 00007ffd2ba9ad30 R15: 00007ffd2ba9ae18
 </TASK>