rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (2 ticks this GP) idle=caec/1/0x4000000000000000 softirq=19211/19211 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=13221, q=609 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5945 Comm: syz-executor Not tainted 6.16.0-rc2-next-20250618-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4880 [inline]
RIP: 0010:__lock_acquire+0x4d3/0xd20 kernel/locking/lockdep.c:5190
Code: c0 0a 00 00 00 0f 84 d7 04 00 00 44 3b bf e8 0a 00 00 0f 8d 04 01 00 00 49 63 df 48 8d 04 9b 4c 8d 3c c7 49 81 c7 10 0b 00 00 <eb> 1d 44 89 e0 48 ff c3 48 63 8f e8 0a 00 00 49 83 c7 28 41 89 c4
RSP: 0018:ffffc90000007ad0 EFLAGS: 00000082
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000ffffffff
RDX: 0000000000000002 RSI: 0000000000004000 RDI: ffff888034139e00
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff84c9ed1a
R10: ffffc90000007cb0 R11: fffff52000000f98 R12: ffffffffffffff02
R13: 0000000000000002 R14: ffff88803413a918 R15: ffff88803413a910
FS:  00005555855dd500(0000) GS:ffff888125c3d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005649db68d008 CR3: 0000000024eb2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162
 debug_object_deactivate+0x9a/0x250 lib/debugobjects.c:873
 debug_hrtimer_deactivate kernel/time/hrtimer.c:450 [inline]
 debug_deactivate+0x1d/0x200 kernel/time/hrtimer.c:490
 __run_hrtimer kernel/time/hrtimer.c:1729 [inline]
 __hrtimer_run_queues+0x2b0/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sock_sendmsg+0x54/0x270 net/socket.c:727
Code: 03 43 80 3c 2f 00 74 08 48 89 df e8 16 4a de f8 41 8b 56 28 4c 89 e7 4c 89 f6 e8 07 80 30 fb 89 c5 31 ff 89 c6 e8 ec 21 7a f8 <85> ed 74 0a e8 a3 1d 7a f8 e9 a7 00 00 00 4c 89 24 24 49 83 c4 20
RSP: 0018:ffffc900040cfc80 EFLAGS: 00000293
RAX: ffffffff89463994 RBX: ffffc900040cfdc8 RCX: 0000000000000000
RDX: ffff888034139e00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88807cd98000 R09: 0000000000000003
R10: 000000000000000a R11: 0000000000000000 R12: ffff888055cda400
R13: dffffc0000000000 R14: ffffc900040cfda0 R15: 1ffff92000819fb9
 __sys_sendto+0x3bd/0x520 net/socket.c:2226
 __do_sys_sendto net/socket.c:2233 [inline]
 __se_sys_sendto net/socket.c:2229 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2229
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7e099907bc
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffffb5a28c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f7e0a6e4620 RCX: 00007f7e099907bc
RDX: 0000000000000028 RSI: 00007f7e0a6e4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffffb5a2914 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f7e0a6e4670 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g13221 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=6128
rcu: rcu_preempt kthread starved for 10502 jiffies! g13221 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27128 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5313 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6696
 __schedule_loop kernel/sched/core.c:6774 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6789
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2060
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2262
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>