rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5188/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=21045, q=535 ncpus=2)
task:udevd           state:R  running task     stack:25952 pid:5188  tgid:5188  ppid:1      task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7095
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:389 [inline]
 copy_pte_range mm/memory.c:1344 [inline]
 copy_pmd_range+0x75a1/0x8050 mm/memory.c:1405
 copy_pud_range mm/memory.c:1442 [inline]
 copy_p4d_range mm/memory.c:1466 [inline]
 copy_page_range+0xbe8/0x11f0 mm/memory.c:1552
 dup_mmap+0xf40/0x1d90 mm/mmap.c:1841
 dup_mm kernel/fork.c:1531 [inline]
 copy_mm+0x13b/0x4a0 kernel/fork.c:1583
 copy_process+0x18b6/0x3cd0 kernel/fork.c:2223
 kernel_clone+0x248/0x8e0 kernel/fork.c:2653
 __do_sys_clone kernel/fork.c:2794 [inline]
 __se_sys_clone kernel/fork.c:2778 [inline]
 __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2778
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f69e8cf1636
RSP: 002b:00007ffe07262620 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffe07262628 RCX: 00007f69e8cf1636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00005646fd156910 R08: 0000000000000000 R09: 00005646fd15e8e0
R10: 00007f69e9408b50 R11: 0000000000000246 R12: 00007ffe072629e0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10438 jiffies! g21045 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:27776 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 6609 Comm: vhost-6604 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:cmp_ex_search+0x4/0x80 lib/extable.c:92
Code: 41 5f 5d e9 a9 f3 6b f5 cc e8 f8 63 0b 00 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <41> 57 41 56 53 48 89 f3 49 89 fe 49 bf 00 00 00 00 00 fc ff df e8
RSP: 0018:ffffc90003ff76b8 EFLAGS: 00000296
RAX: ffffffff84ae71a7 RBX: 0000000000000001 RCX: ffff888057f59e80
RDX: 0000000000000000 RSI: ffffffff8e397778 RDI: ffffc90003ff7720
RBP: ffffffff8e397778 R08: ffffffff8ba44d80 R09: 1ffff11027fc7b12
R10: dffffc0000000000 R11: ffffffff8ba44d80 R12: ffffffff8e3959fc
R13: ffffc90003ff7720 R14: 000000000000000c R15: 00000000000004eb
FS:  00007f7f2f45b6c0(0000) GS:ffff888125454000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 000000004f3a3000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __inline_bsearch include/linux/bsearch.h:15 [inline]
 bsearch+0x50/0xc0 lib/bsearch.c:33
 search_extable+0x8f/0xd0 lib/extable.c:116
 search_kernel_exception_table kernel/extable.c:49 [inline]
 search_exception_tables+0x3a/0x60 kernel/extable.c:58
 fixup_exception+0xc1/0x20d0 arch/x86/mm/extable.c:319
 kernelmode_fixup_or_oops+0x68/0xf0 arch/x86/mm/fault.c:726
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:__get_user_2+0x14/0x30 arch/x86/lib/getuser.S:77
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 ba 00 f0 ff ff ff 7f 00 00 48 39 d0 48 0f 47 c2 0f 01 cb <0f> b7 10 31 c0 0f 01 ca e9 0a ea 61 f5 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003ff7a50 EFLAGS: 00050283
RAX: 0000000000000002 RBX: ffff8880295001e0 RCX: 0000000000000046
RDX: 00007ffffffff000 RSI: ffffffff8e16c434 RDI: ffffffff8c27d500
RBP: 0000000000000000 R08: ffffffff8216841f R09: ffff88813fe3d900
R10: dffffc0000000000 R11: fffffbfff2023ad7 R12: dffffc0000000000
R13: ffffc90003ff7c00 R14: ffff888029500290 R15: ffffc90003ff7a58
 vhost_get_avail_idx+0xe6/0x460 drivers/vhost/vhost.c:1527
 vhost_enable_notify+0x325/0x650 drivers/vhost/vhost.c:3240
 vhost_transport_do_send_pkt+0xfb1/0x13a0 drivers/vhost/vsock.c:128
 vhost_run_work_list+0x14d/0x1e0 drivers/vhost/vhost.c:454
 vhost_task_fn+0x2ef/0x4a0 kernel/vhost_task.c:49
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>