rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P13766/1:b..l rcu: (detected by 1, t=10503 jiffies, g=105461, q=790617 ncpus=2) task:syz.0.2394 state:R running task stack:24392 pid:13766 tgid:13763 ppid:5633 task_flags:0x400140 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5533 [inline] __schedule+0x17db/0x58f0 kernel/sched/core.c:7284 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7606 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x14f/0x920 kernel/entry/common.c:167 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:unwind_next_frame+0x11da/0x2550 arch/x86/kernel/unwind_orc.c:670 Code: 8b 54 24 08 4c 89 3b 43 0f b6 44 25 00 84 c0 0f 85 29 11 00 00 49 8d 46 36 c6 00 00 49 8d 5e 50 4c 8b 6c 24 18 48 8b 44 24 30 <42> 0f b6 04 20 84 c0 4c 8b 04 24 0f 85 46 0e 00 00 42 0f b6 44 25 RSP: 0018:ffffc900033dec08 EFLAGS: 00000246 RAX: 1ffffffff22247e0 RBX: ffffc900033ded58 RCX: 0000000000000000 RDX: ffffffff91123f00 RSI: 0000000000000000 RDI: ffffc900033ded68 RBP: 1ffffffff22247e0 R08: ffffc900033ded67 R09: 0000000000000000 R10: ffffc900033ded58 R11: fffff5200067bdad R12: dffffc0000000000 R13: ffffffff91123efc R14: ffffc900033ded08 R15: ffffc900033ded50 __unwind_start+0x514/0x660 arch/x86/kernel/unwind_orc.c:787 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 save_stack+0x122/0x230 mm/page_owner.c:183 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:359 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436 alloc_pages_mpol+0x21e/0x390 mm/mempolicy.c:2486 folio_alloc_mpol_noprof+0x39/0x160 mm/mempolicy.c:2505 shmem_alloc_folio mm/shmem.c:1936 [inline] shmem_alloc_and_add_folio+0x43e/0xf60 mm/shmem.c:1978 shmem_get_folio_gfp+0x5da/0x16d0 mm/shmem.c:2531 shmem_fault+0x179/0x390 mm/shmem.c:2732 __do_fault+0x138/0x2a0 mm/memory.c:5565 do_shared_fault mm/memory.c:6064 [inline] do_fault mm/memory.c:6138 [inline] do_pte_missing+0x684/0x34b0 mm/memory.c:4700 handle_pte_fault mm/memory.c:6558 [inline] __handle_mm_fault mm/memory.c:6707 [inline] handle_mm_fault+0x1a53/0x3750 mm/memory.c:6876 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1675/0x2750 mm/gup.c:1428 __get_user_pages_locked mm/gup.c:1692 [inline] faultin_page_range+0x26a/0x8f0 mm/gup.c:1912 madvise_populate mm/madvise.c:977 [inline] madvise_do_behavior+0x2e4/0x540 mm/madvise.c:1914 do_madvise+0x327/0x3a0 mm/madvise.c:2014 __do_sys_madvise mm/madvise.c:2023 [inline] __se_sys_madvise mm/madvise.c:2021 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2021 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f22d439e199 RSP: 002b:00007f22d527b028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f22d4626180 RCX: 00007f22d439e199 RDX: 0000000000000017 RSI: 0000000000600000 RDI: 0000200000000000 RBP: 00007f22d44358e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f22d4626218 R14: 00007f22d4626180 R15: 00007f22d474fa48