rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6964/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=77297, q=162 ncpus=2)
task:syz-executor    state:R  running task     stack:21032 pid:6964  ppid:6952   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6701
 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011
 irqentry_exit+0x67/0x70 kernel/entry/common.c:441
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline]
RIP: 0010:rcu_is_watching+0x9/0xb0 kernel/rcu/tree.c:699
Code: f7 1f 09 48 c7 c7 40 89 13 8d 4c 89 f6 e8 ff 24 f6 02 e9 44 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 41 57 41 56 53 <65> ff 05 e8 65 92 7e e8 ab 0d 20 09 89 c3 83 f8 08 73 60 49 bf 00
RSP: 0018:ffffc900045cf660 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff81e80cc9 RCX: ffff88805ff30000
RDX: 0000000000000000 RSI: ffffffff8b1d3b80 RDI: ffffffff8b1d3b40
RBP: ffff88805c574054 R08: dffffc0000000000 R09: 1ffffffff223d6a0
R10: dffffc0000000000 R11: fffffbfff223d6a1 R12: dffffc0000000000
R13: ffffea00013e7d78 R14: 0000000000000001 R15: ffff88805c574010
 rcu_read_unlock include/linux/rcupdate.h:815 [inline]
 percpu_ref_get_many+0xb5/0x140 include/linux/percpu-refcount.h:209
 percpu_ref_get include/linux/percpu-refcount.h:222 [inline]
 css_get include/linux/cgroup_refcnt.h:11 [inline]
 uncharge_folio+0x1d9/0x6e0 mm/memcontrol.c:7263
 __mem_cgroup_uncharge_list+0xda/0x160 mm/memcontrol.c:7314
 mem_cgroup_uncharge_list include/linux/memcontrol.h:713 [inline]
 release_pages+0x2082/0x2300 mm/swap.c:1021
 __folio_batch_release+0x71/0xe0 mm/swap.c:1042
 folio_batch_release include/linux/pagevec.h:83 [inline]
 shmem_undo_range+0x5ff/0x1a80 mm/shmem.c:1026
 shmem_truncate_range mm/shmem.c:1135 [inline]
 shmem_evict_inode+0x285/0xa70 mm/shmem.c:1264
 evict+0x4b7/0x8a0 fs/inode.c:705
 do_unlinkat+0x38c/0x590 fs/namei.c:4453
 __do_sys_unlink fs/namei.c:4494 [inline]
 __se_sys_unlink fs/namei.c:4492 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4492
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5431f9d247
RSP: 002b:00007ffe749bd498 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5431f9d247
RDX: 00007ffe749bd4c0 RSI: 00007ffe749bd550 RDI: 00007ffe749bd550
RBP: 00007ffe749bd550 R08: 00007ffe749be550 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffe749be5e0
R13: 00007f54320344bb R14: 0000000000161fa0 R15: 00007ffe749be620
 </TASK>
rcu: rcu_preempt kthread starved for 10154 jiffies! g77297 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:25936 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6701
 schedule+0xbd/0x170 kernel/sched/core.c:6775
 schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
 rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pv_native_safe_halt+0xf/0x10 arch/x86/kernel/paravirt.c:148
Code: 89 18 02 c3 cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d 03 f6 36 00 fb f4 <c3> 66 0f 1f 00 55 41 57 41 56 41 54 53 50 8b 2f eb 2c 89 cb 80 f9
RSP: 0018:ffffc90000187de0 EFLAGS: 000002c6
RAX: e59560794ef81000 RBX: ffffffff81631d11 RCX: e59560794ef81000
RDX: 0000000000000001 RSI: ffffffff8acacce0 RDI: ffffffff8b1d3ba0
RBP: ffffc90000187f20 R08: ffff8880b8f36b6b R09: 1ffff110171e6d6d
R10: dffffc0000000000 R11: ffffed10171e6d6e R12: 1ffff92000030fc8
R13: dffffc0000000000 R14: 1ffff1100374d780 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4365c00020 CR3: 000000002f6f7000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:753
 default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
 cpuidle_idle_call kernel/sched/idle.c:178 [inline]
 do_idle+0x221/0x5c0 kernel/sched/idle.c:302
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:401
 start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323
 secondary_startup_64_no_verify+0x179/0x17b
 </TASK>