rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7442/1:b..l rcu: (detected by 0, t=10502 jiffies, g=15185, q=2957 ncpus=2) task:syz.1.392 state:R running task stack:23992 pid:7442 tgid:7441 ppid:5831 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7078 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:unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369 Code: c0 75 4b 83 3b 00 74 3a 48 83 c3 48 49 89 df 49 c1 ef 03 43 80 3c 37 00 74 08 48 89 df e8 6b 34 ba 00 48 8b 3b e8 43 72 1e 00 <85> c0 74 14 43 80 3c 37 00 74 08 48 89 df e8 50 34 ba 00 48 8b 03 RSP: 0018:ffffc9000500eb00 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffc9000500eb68 RCX: ffffffff91792000 RDX: ffffffff91942801 RSI: 0000000000000000 RDI: ffffffff821dc274 RBP: ffffc9000500ebb0 R08: ffffc9000500eb7f R09: ffffc9000500eb70 R10: dffffc0000000000 R11: fffff52000a01d70 R12: ffff888025a50000 R13: ffffffff818b3a20 R14: dffffc0000000000 R15: 1ffff92000a01d6d arch_stack_walk+0xfd/0x150 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 save_stack+0xfb/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x76/0x430 mm/page_owner.c:297 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_folios+0xe39/0x18b0 mm/page_alloc.c:2706 folios_put_refs+0x76c/0x860 mm/swap.c:962 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x593/0x1820 mm/shmem.c:1044 shmem_truncate_range mm/shmem.c:1156 [inline] shmem_evict_inode+0x29b/0xa80 mm/shmem.c:1284 evict+0x4ea/0x9a0 fs/inode.c:796 __dentry_kill+0x20d/0x630 fs/dcache.c:625 shrink_kill+0xa9/0x2c0 fs/dcache.c:1070 shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1097 shrink_dcache_parent+0xcb/0x3b0 do_one_tree+0x23/0xe0 fs/dcache.c:1560 shrink_dcache_for_umount+0xb4/0x180 fs/dcache.c:1577 generic_shutdown_super+0x6a/0x2d0 fs/super.c:620 kill_anon_super fs/super.c:1237 [inline] kill_litter_super+0x76/0xb0 fs/super.c:1247 deactivate_locked_super+0xc6/0x130 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373 task_work_run+0x251/0x310 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xa2a/0x28e0 kernel/exit.c:938 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 get_signal+0x16b2/0x1750 kernel/signal.c:3017 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe78f185d29 RSP: 002b:00007fe78fff9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: 0000000000018ff8 RBX: 00007fe78f375fa0 RCX: 00007fe78f185d29 RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000004 RBP: 00007fe78f201aa8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe78f375fa0 R15: 00007ffd011386e8