rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P18992/1:b..l rcu: (detected by 1, t=10503 jiffies, g=94689, q=921 ncpus=2) task:syz.4.2825 state:R running task stack:25352 pid:18992 tgid:18990 ppid:14824 task_flags:0x40054c flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5392 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6781 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7104 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline] RIP: 0010:lock_release+0x4d/0x3e0 kernel/locking/lockdep.c:5882 Code: 24 28 0f 1f 44 00 00 65 8b 05 a3 dd fd 10 83 f8 08 0f 83 9a 02 00 00 89 c0 48 0f a3 05 4c 9e 02 0e 73 16 e8 e5 e1 08 00 84 c0 <75> 0d f6 05 20 8b ec 0d 01 0f 84 ad 02 00 00 83 3d 6d cf 02 0e 00 RSP: 0018:ffffc9000b587410 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffffff902e7a01 RCX: 11e1df3cdefea800 RDX: ffffc9000b587501 RSI: ffffffff8be27420 RDI: ffffffff8be273e0 RBP: dffffc0000000000 R08: ffffc9000b587ec0 R09: ffffc9000b587598 R10: dffffc0000000000 R11: fffff520016b0eb5 R12: ffffc9000b587ed0 R13: ffffffff81729e15 R14: ffffffff8e13f080 R15: ffffffff81729e15 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] class_rcu_destructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf5/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706 discard_slab mm/slub.c:2716 [inline] __put_partials+0x161/0x1c0 mm/slub.c:3185 put_cpu_partial+0x17c/0x250 mm/slub.c:3260 __slab_free+0x2f7/0x400 mm/slub.c:4512 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4203 taskstats_tgid_alloc kernel/taskstats.c:576 [inline] taskstats_exit+0x14a/0xa30 kernel/taskstats.c:615 do_exit+0x630/0x22e0 kernel/exit.c:940 do_group_exit+0x21c/0x2d0 kernel/exit.c:1104 get_signal+0x1286/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0b3e58e969 RSP: 002b:00007f0b3f478038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: 0000000000003a10 RBX: 00007f0b3e7b5fa0 RCX: 00007f0b3e58e969 RDX: 0000000000000002 RSI: 0000200000000840 RDI: 0000000000000006 RBP: 00007f0b3e610ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0b3e7b5fa0 R15: 00007ffff7316918