rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (2 ticks this GP) idle=0d6c/1/0x4000000000000000 softirq=8244/8244 fqs=378
rcu: 	(detected by 0, t=10502 jiffies, g=10245, q=938 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 1044 Comm: kworker/u8:6 Not tainted 6.8.0-syzkaller-05204-g237bb5f7f7f5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:debug_object_activate+0x401/0x510 lib/debugobjects.c:743
Code: 7c 24 28 48 8b 74 24 20 e8 3c 77 ce 06 45 31 e4 48 c7 44 24 40 0e 36 e0 45 43 c7 04 2e 00 00 00 00 43 c7 44 2e 09 00 00 00 00 <66> 43 c7 44 2e 0d 00 00 43 c6 44 2e 0f 00 65 48 8b 04 25 28 00 00
RSP: 0018:ffffc90000a08c00 EFLAGS: 00000046
RAX: 147ae7ccecbdc000 RBX: 1ffff1100fddc598 RCX: 0000000000010002
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
RBP: ffffc90000a08d18 R08: ffffffff9472c7cb R09: 1ffffffff28e58f9
R10: dffffc0000000000 R11: fffffbfff28e58fa R12: 0000000000000000
R13: 1ffff92000141188 R14: dffffc0000000000 R15: ffff88807eee2cb0
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f206e97b208 CR3: 000000007b4a8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 debug_hrtimer_activate kernel/time/hrtimer.c:423 [inline]
 debug_activate kernel/time/hrtimer.c:478 [inline]
 enqueue_hrtimer+0x30/0x3a0 kernel/time/hrtimer.c:1090
 __run_hrtimer kernel/time/hrtimer.c:1709 [inline]
 __hrtimer_run_queues+0x6b5/0xd00 kernel/time/hrtimer.c:1756
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1818
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x107/0x3a0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_is_held_type+0x13b/0x190
Code: 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 42 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc900049469c0 EFLAGS: 00000206
RAX: 147ae7ccecbdc000 RBX: 0000000000000001 RCX: 0000000080000000
RDX: ffff8880218d0000 RSI: ffffffff8baad3a0 RDI: ffffffff8bfec660
RBP: 0000000000000005 R08: ffffffff81ca8b78 R09: 1ffffd40003b3d96
R10: dffffc0000000000 R11: fffff940003b3d97 R12: 0000000000000246
R13: ffff8880218d0000 R14: 00000000ffffffff R15: ffffffff8e131920
 xa_entry include/linux/xarray.h:1216 [inline]
 xas_reload+0x1a4/0x470 include/linux/xarray.h:1595
 find_get_entry mm/filemap.c:1976 [inline]
 filemap_get_folios_tag+0x3c8/0x900 mm/filemap.c:2211
 mpage_prepare_extent_to_map+0x589/0x1c20 fs/ext4/inode.c:2392
 ext4_do_writepages+0x122c/0x3ca0 fs/ext4/inode.c:2677
 ext4_writepages+0x204/0x3e0 fs/ext4/inode.c:2768
 do_writepages+0x3a4/0x670 mm/page-writeback.c:2553
 __writeback_single_inode+0x155/0xfd0 fs/fs-writeback.c:1650
 writeback_sb_inodes+0x8e4/0x1220 fs/fs-writeback.c:1941
 __writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2012
 wb_writeback+0x45b/0xc70 fs/fs-writeback.c:2119
 wb_check_old_data_flush fs/fs-writeback.c:2223 [inline]
 wb_do_writeback fs/fs-writeback.c:2276 [inline]
 wb_workfn+0xb7c/0x1070 fs/fs-writeback.c:2304
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 9740 jiffies! g10245 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=4708
rcu: rcu_preempt kthread starved for 9741 jiffies! g10245 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:25496 pid:16    tgid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x17d3/0x4a20 kernel/sched/core.c:6736
 __schedule_loop kernel/sched/core.c:6813 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6828
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2572
 rcu_gp_fqs_loop+0x2df/0x1370 kernel/rcu/tree.c:1663
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1862
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>