rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6228/3:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=17113, q=558 ncpus=2)
task:syz-executor    state:R  running task     stack:28504 pid:6228  tgid:6228  ppid:5950   task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x14ed/0x5040 kernel/sched/core.c:6866
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7050
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 filemap_map_pages+0x192d/0x1fd0 mm/filemap.c:3931
 do_fault_around mm/memory.c:5695 [inline]
 do_read_fault mm/memory.c:5728 [inline]
 do_fault mm/memory.c:5871 [inline]
 do_pte_missing+0x20b0/0x3330 mm/memory.c:4416
 handle_pte_fault mm/memory.c:6255 [inline]
 __handle_mm_fault mm/memory.c:6393 [inline]
 handle_mm_fault+0x1b26/0x32b0 mm/memory.c:6562
 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x71/0xd0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f8b05337b50
RSP: 002b:00007ffdb44d5008 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 00007f8b054157ac RSI: 0000000000000040 RDI: 00007ffdb44d50a0
RBP: 00007ffdb44d504c R08: 0000000000000000 R09: 00007f8b0611d6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 00000000000927c0 R14: 000000000002bc21 R15: 00007ffdb44d50a0
 </TASK>
rcu: rcu_preempt kthread starved for 10513 jiffies! g17113 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:27640 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x14ed/0x5040 kernel/sched/core.c:6866
 __schedule_loop kernel/sched/core.c:6948 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6963
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x11b0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9b/0x2d0 kernel/rcu/tree.c:2297
 kthread+0x389/0x480 kernel/kthread.c:467
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6226 Comm: vhost-6225 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__might_sleep+0x5/0xf0 kernel/sched/core.c:8748
Code: 0f 8c 3c ff ff ff 48 89 df e8 c7 4f 95 00 e9 2f ff ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <41> 57 41 56 41 55 41 54 53 50 49 bf 00 00 00 00 00 fc ff df 65 48
RSP: 0018:ffffc9000426f788 EFLAGS: 00000246
RAX: ffffffff820eeee3 RBX: ffff88807e763c80 RCX: 0000000000000000
RDX: ffff88807e763c80 RSI: 00000000000005fb RDI: ffffffff8c8244be
RBP: 00000000000005fb R08: ffffc9000426fc80 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100b1b52d5 R12: dffffc0000000000
R13: ffff888058da4c00 R14: ffffffff8c8244be R15: 0000000000000000
FS:  00007f06e6c106c0(0000) GS:ffff888125ac0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f828fc1af98 CR3: 00000000767c4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __might_fault+0x77/0x130 mm/memory.c:7154
 vhost_get_avail_idx+0xb7/0x470 drivers/vhost/vhost.c:1531
 vhost_get_vq_desc_n+0x162/0x29a0 drivers/vhost/vhost.c:2834
 vhost_get_vq_desc+0x40/0x60 drivers/vhost/vhost.c:2966
 vhost_vsock_handle_tx_kick+0x276/0xfe0 drivers/vhost/vsock.c:513
 vhost_run_work_list+0x14e/0x1e0 drivers/vhost/vhost.c:454
 vhost_task_fn+0x27c/0x430 kernel/vhost_task.c:49
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>