rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P50/1:b..l..
rcu: 	(detected by 0, t=10503 jiffies, g=37513, q=1019214 ncpus=2)
task:kworker/u8:3    state:R  running task     stack:19680 pid:50    tgid:50    ppid:2      task_flags:0x4248060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5820 kernel/sched/core.c:7382
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7662
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
 irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 70 a3 54 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 72 7d f9 12 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 4f b7 57 0a cc 48 8d 3d a7 86 dc
RSP: 0000:ffffc90000ba65c0 EFLAGS: 00000296
RAX: e7b6d32d7d166500 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000098a8991 RSI: ffffffff8e71beaa RDI: ffffffff8c6e0980
RBP: ffff88801c1b1f40 R08: ffffffff8178699f R09: 0000000000000000
R10: ffffc90000ba66f8 R11: ffffffff81b30cd0 R12: ffffffff8fd59d60
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 save_stack+0x122/0x230 mm/page_owner.c:183
 __reset_page_owner+0x73/0x2a0 mm/page_owner.c:338
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1401 [inline]
 __free_frozen_pages+0xc97/0xd90 mm/page_alloc.c:2952
 __slab_free+0x269/0x2c0 mm/slub.c:5926
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4720 [inline]
 slab_alloc_node mm/slub.c:5033 [inline]
 kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5047
 new_handle fs/jbd2/transaction.c:457 [inline]
 jbd2__journal_start+0x1db/0x5d0 fs/jbd2/transaction.c:491
 __ext4_journal_start_sb+0x205/0x780 fs/ext4/ext4_jbd2.c:122
 __ext4_journal_start fs/ext4/ext4_jbd2.h:238 [inline]
 ext4_do_writepages+0xf4c/0x4770 fs/ext4/inode.c:2920
 ext4_writepages+0x1fe/0x4e0 fs/ext4/inode.c:3032
 do_writepages+0x338/0x560 mm/page-writeback.c:2560
 __writeback_single_inode+0x136/0x1220 fs/fs-writeback.c:1800
 writeback_sb_inodes+0x9de/0x1af0 fs/fs-writeback.c:2111
 __writeback_inodes_wb+0x114/0x240 fs/fs-writeback.c:2187
 wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2298
 wb_check_old_data_flush fs/fs-writeback.c:2402 [inline]
 wb_do_writeback fs/fs-writeback.c:2481 [inline]
 wb_workfn+0xc92/0x10f0 fs/fs-writeback.c:2509
 process_one_work kernel/workqueue.c:3495 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>