rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P15038/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=71021, q=437014 ncpus=2)
task:syz.6.2239      state:R  running task     stack:24312 pid:15038 tgid:15038 ppid:12225  task_flags:0x40044c flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7193
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:60 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:409 [inline]
RIP: 0010:deref_stack_reg+0xb9/0x230 arch/x86/kernel/unwind_orc.c:419
Code: ed 03 0f b6 44 35 00 84 c0 0f 85 3c 01 00 00 41 83 3f 00 0f 95 c0 4c 39 c3 0f 96 c1 20 c1 4d 39 c6 0f 97 c0 20 c8 3c 01 75 18 <49> 8d 40 08 48 39 d8 0f 97 c1 4c 39 f0 0f 96 c0 84 c1 0f 85 c3 00
RSP: 0018:ffffc9000bedf3e0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffc9000bed8000 RCX: 0000000000000001
RDX: ffffc9000bedf548 RSI: dffffc0000000000 RDI: ffffc9000bedf508
RBP: 1ffff920017dbea1 R08: ffffc9000bedf7b0 R09: 0000000000000000
R10: ffffc9000bedf558 R11: fffff520017dbead R12: 1ffff920017dbea2
R13: 1ffff920017dbea3 R14: ffffc9000bee0000 R15: ffffc9000bedf508
 unwind_next_frame+0x18cc/0x23d0 arch/x86/kernel/unwind_orc.c:-1
 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:165
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1406 [inline]
 __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2943
 discard_slab mm/slub.c:3346 [inline]
 __put_partials+0x146/0x170 mm/slub.c:3886
 put_cpu_partial+0x1f2/0x2d0 mm/slub.c:3961
 __slab_free+0x288/0x2a0 mm/slub.c:5956
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5267 [inline]
 kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5274
 taskstats_tgid_alloc kernel/taskstats.c:576 [inline]
 taskstats_exit+0x14a/0xa30 kernel/taskstats.c:615
 do_exit+0x830/0x25b0 kernel/exit.c:941
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1112
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2d0/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6f9038f783
RSP: 002b:00007fff883a2788 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: 00007f6f8ddf4000 RBX: 00007f6f905e63f8 RCX: 00007f6f9038f783
RDX: 0000000000000003 RSI: 0000000000400000 RDI: 00007f6f8ddf4000
RBP: 00007f6f905e6360 R08: 00000000000000dc R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f6f905e6360 R14: 0000000000001d32 R15: 0000000000000007
 </TASK>