rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7172/1:b..l rcu: (detected by 1, t=10502 jiffies, g=30425, q=223010 ncpus=2) task:syz.0.365 state:R running task stack:24568 pid:7172 tgid:7167 ppid:5855 task_flags:0x40044c flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5387 [inline] __schedule+0x17b4/0x5680 kernel/sched/core.c:7188 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7512 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline] irqentry_exit+0x14f/0x730 kernel/entry/common.c:164 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:867 [inline] RIP: 0010:percpu_ref_get_many+0xa7/0x140 include/linux/percpu-refcount.h:209 Code: bc 00 00 00 00 00 fc ff df 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 b4 f3 f6 ff 49 8b 07 a8 03 75 62 65 4c 01 30 14 42 7e 09 85 c0 74 3a e8 6b db 70 ff 84 c0 75 31 e8 02 42 7e RSP: 0018:ffffc9000200ee00 EFLAGS: 00000202 RAX: 0000607edaa764a8 RBX: ffffffff823a17e9 RCX: 0000000080000001 RDX: 00000000cdac3f13 RSI: ffffffff8c289cc0 RDI: ffffffff8c289c80 RBP: ffff8880372b63b0 R08: ffffffff823a17e9 R09: ffffffff8e95cce0 R10: dffffc0000000000 R11: fffff94000234b61 R12: dffffc0000000000 R13: ffffea00011a5b08 R14: 0000000000000001 R15: ffff8880372b6380 obj_cgroup_get_many include/linux/memcontrol.h:765 [inline] obj_cgroup_get include/linux/memcontrol.h:770 [inline] uncharge_folio+0x1ac/0x4b0 mm/memcontrol.c:5158 __mem_cgroup_uncharge_folios+0xfd/0x1d0 mm/memcontrol.c:5199 mem_cgroup_uncharge_folios include/linux/memcontrol.h:672 [inline] folios_put_refs+0x9f7/0xb40 mm/swap.c:1007 free_pages_and_swap_cache+0x2b9/0x490 mm/swap_state.c:401 __tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline] tlb_batch_pages_flush mm/mmu_gather.c:151 [inline] tlb_flush_mmu_free mm/mmu_gather.c:417 [inline] tlb_flush_mmu+0x6d3/0xa30 mm/mmu_gather.c:424 zap_pte_range mm/memory.c:1957 [inline] zap_pmd_range mm/memory.c:2004 [inline] zap_pud_range mm/memory.c:2032 [inline] zap_p4d_range mm/memory.c:2053 [inline] __zap_vma_range+0x3dc3/0x4b40 mm/memory.c:2093 unmap_vmas+0x379/0x530 mm/memory.c:2162 exit_mmap+0x280/0x9e0 mm/mmap.c:1300 __mmput+0x118/0x430 kernel/fork.c:1178 exit_mm+0x18e/0x250 kernel/exit.c:581 do_exit+0x6a2/0x22c0 kernel/exit.c:963 do_group_exit+0x21b/0x2d0 kernel/exit.c:1117 get_signal+0x1284/0x1330 kernel/signal.c:3037 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline] do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f172c39c819 RSP: 002b:00007f172d1ff0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f172c616188 RCX: 00007f172c39c819 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f172c616188 RBP: 00007f172c616180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f172c616218 R14: 00007f172c73f960 R15: 00007f172c73fa48