syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P15445/2:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=100481, q=273 ncpus=2)
task:syz-executor.1  state:R  running task     stack:26864 pid:15445 tgid:15444 ppid:12013  flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x4/0x9f0 kernel/locking/lockdep.c:5762
Code: f6 ff ff 48 c7 c7 70 79 ad 8f e8 17 47 89 00 e9 26 f6 ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 00 01
RSP: 0018:ffffc9000b14fc28 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff88807960c001 RCX: ffff888066998000
RDX: dffffc0000000000 RSI: ffffffff820481d4 RDI: ffffffff8e333fa0
RBP: 1ffff110022e1d02 R08: ffffffff92fa7587 R09: 1ffffffff25f4eb0
R10: dffffc0000000000 R11: fffffbfff25f4eb1 R12: ffff88801170e810
R13: dffffc0000000000 R14: ffffffff820481d4 R15: dffffc0000000000
 rcu_lock_release include/linux/rcupdate.h:339 [inline]
 rcu_read_unlock include/linux/rcupdate.h:812 [inline]
 percpu_ref_tryget_many include/linux/percpu-refcount.h:250 [inline]
 percpu_ref_tryget+0xf7/0x180 include/linux/percpu-refcount.h:266
 css_tryget include/linux/cgroup_refcnt.h:45 [inline]
 get_mem_cgroup_from_objcg+0xc8/0x150 include/linux/memcontrol.h:536
 __memcg_slab_post_alloc_hook+0x12e/0x7e0 mm/memcontrol.c:3758
 memcg_slab_post_alloc_hook mm/slub.c:2104 [inline]
 slab_post_alloc_hook mm/slub.c:3962 [inline]
 slab_alloc_node mm/slub.c:4001 [inline]
 kmem_cache_alloc_lru_noprof+0x1e6/0x2b0 mm/slub.c:4020
 shmem_alloc_inode+0x28/0x40 mm/shmem.c:4468
 alloc_inode fs/inode.c:261 [inline]
 new_inode_pseudo+0x6b/0x1e0 fs/inode.c:1007
 new_inode+0x22/0x1d0 fs/inode.c:1033
 __shmem_get_inode mm/shmem.c:2503 [inline]
 shmem_get_inode+0x34a/0xd40 mm/shmem.c:2574
 __shmem_file_setup+0x171/0x2c0 mm/shmem.c:4848
 __do_sys_memfd_create mm/memfd.c:346 [inline]
 __se_sys_memfd_create+0x36b/0x850 mm/memfd.c:283
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6df5a7cf29
RSP: 002b:00007f6df68e1ea8 EFLAGS: 00000202 ORIG_RAX: 000000000000013f
RAX: ffffffffffffffda RBX: 000000000000968d RCX: 00007f6df5a7cf29
RDX: 00007f6df68e1f80 RSI: 0000000000000000 RDI: 00007f6df5ad9a5f
RBP: 000000002001c300 R08: 00007f6df68e1c47 R09: 0000000000000000
R10: 000000000000000a R11: 0000000000000202 R12: 0000000020009640
R13: 00007f6df68e1f80 R14: 00007f6df68e1f40 R15: 00000000200000c0
 </TASK>
rcu: rcu_preempt kthread starved for 10533 jiffies! g100481 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:25528 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.10.0-rc4-syzkaller-00148-g50736169ecc8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline]
RIP: 0010:acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:113
Code: 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 d4 03 00 48 f7 00 08 00 00 00 75 10 eb 07 0f 00 2d 55 87 a3 00 f3 0f 1e fa fb f4 <fa> e9 f4 51 2a 00 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffffff8e007ca8 EFLAGS: 00000246
RAX: ffffffff8e094680 RBX: ffff88801b2a2064 RCX: 000000000033e6c9
RDX: 0000000000000001 RSI: ffff88801b2a2000 RDI: ffff88801b2a2064
RBP: 000000000003a578 R08: ffff8880b9437ccb R09: 1ffff11017286f99
R10: dffffc0000000000 R11: ffffffff8b85eac0 R12: ffff888017fb5800
R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8eacd840
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc1aac0ef00 CR3: 000000007686a000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:707
 cpuidle_enter_state+0x114/0x480 drivers/cpuidle/cpuidle.c:267
 cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:388
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x375/0x5d0 kernel/sched/idle.c:332
 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:430
 rest_init+0x2dc/0x300 init/main.c:747
 start_kernel+0x47a/0x500 init/main.c:1103
 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
 x86_64_start_kernel+0x99/0xa0 arch/x86/kernel/head64.c:488
 common_startup_64+0x13e/0x147
 </TASK>