syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P976/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=15257, q=824753 ncpus=2)
task:kworker/0:2     state:R  running task     stack:26104 pid:976   tgid:976   ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events key_garbage_collector
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x116a/0x5de0 kernel/sched/core.c:6785
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7108
 irqentry_exit+0x36/0x90 kernel/entry/common.c:307
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:220 [inline]
RIP: 0010:unwind_next_frame+0x2a0/0x20a0 arch/x86/kernel/unwind_orc.c:494
Code: 28 89 74 24 20 44 89 5c 24 18 e8 0b 33 b8 00 48 8b 54 24 30 8b 4c 24 28 8b 74 24 20 44 8b 5c 24 18 89 cf 8b 14 95 e4 d9 f8 91 <48> 8d 04 7f 48 8d 84 00 fc 78 36 91 83 c2 01 48 3d e4 d9 f8 91 0f
RSP: 0018:ffffc90003b47580 EFLAGS: 00000246
RAX: 0000000000000007 RBX: 0000000000000001 RCX: 00000000000378ed
RDX: 00000000000378f9 RSI: 00000000000a84ac RDI: 00000000000378ed
RBP: ffffc90003b47638 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 000000000001230f R12: ffffc90003b47640
R13: ffffc90003b475f0 R14: ffffc90003b47625 R15: ffffffff82230f6c
 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 save_stack+0x160/0x1f0 mm/page_owner.c:156
 __reset_page_owner+0x84/0x1a0 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+0x7fe/0x1180 mm/page_alloc.c:2706
 discard_slab mm/slub.c:2717 [inline]
 __put_partials+0x16d/0x1c0 mm/slub.c:3186
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4148 [inline]
 slab_alloc_node mm/slub.c:4197 [inline]
 __kmalloc_cache_noprof+0x1f1/0x3e0 mm/slub.c:4354
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 assoc_array_gc+0x3dd/0x15b0 lib/assoc_array.c:1508
 keyring_gc+0x1b5/0x2e0 security/keys/keyring.c:1743
 key_garbage_collector+0x760/0x960 security/keys/gc.c:358
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>