rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (2 ticks this GP) idle=c6fc/1/0x4000000000000000 softirq=16547/16547 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=13889, q=356 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5977 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:_raw_spin_unlock_irqrestore+0x3b/0x110 kernel/locking/spinlock.c:193
Code: e4 e0 48 83 ec 60 48 89 f3 49 89 fe 65 48 8b 05 5b 99 42 07 48 89 44 24 48 48 c7 04 24 b3 8a b5 41 48 c7 44 24 08 2c 20 86 8d <48> c7 44 24 10 a0 a6 4e 8b 49 89 e7 49 c1 ef 03 48 b8 f1 f1 f1 f1
RSP: 0018:ffffc90000a08ca0 EFLAGS: 00000086
RAX: 7ddf1aa1d5544a00 RBX: 0000000000000806 RCX: 0000000000000001
RDX: 0000000000010000 RSI: 0000000000000806 RDI: ffff8880b8727ac0
RBP: ffffc90000a08d30 R08: ffffffff8f9e1177 R09: 1ffffffff1f3c22e
R10: dffffc0000000000 R11: fffffbfff1f3c22f R12: ffff888066d77340
R13: dffffc0000000000 R14: ffff8880b8727ac0 R15: 00000000fffffffd
FS:  0000555595386500(0000) GS:ffff888125e0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f507cb156c0 CR3: 000000007c286000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1773 [inline]
 __hrtimer_run_queues+0x408/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:118 [inline]
RIP: 0010:lock_release+0x5c/0x3e0 kernel/locking/lockdep.c:5881
Code: f8 08 0f 83 9a 02 00 00 89 c0 48 0f a3 05 4c 6e 00 0e 73 16 e8 a5 ea 08 00 84 c0 75 0d f6 05 b9 79 ea 0d 01 0f 84 ad 02 00 00 <83> 3d 4d 9e 00 0e 00 0f 84 44 02 00 00 65 8b 05 20 dd f3 10 85 c0
RSP: 0018:ffffc9000426f638 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff8880328292d0 RCX: 7ddf1aa1d5544a00
RDX: 0000000000000000 RSI: ffffffff8bc076c0 RDI: ffffffff8bc07680
RBP: ffffc9000426f7b8 R08: ffffffff8f9e1177 R09: 1ffffffff1f3c22e
R10: dffffc0000000000 R11: fffffbfff1f3c22f R12: 0000000000000000
R13: ffffffff8166dfa6 R14: ffff888032829338 R15: ffff8880328292d0
 __mutex_unlock_slowpath+0xcc/0x740 kernel/locking/mutex.c:922
 ldt_dup_context+0x336/0x3e0 arch/x86/kernel/ldt.c:482
 arch_dup_mmap arch/x86/include/asm/mmu_context.h:228 [inline]
 dup_mmap+0x1240/0x1b10 mm/mmap.c:1842
 dup_mm kernel/fork.c:1489 [inline]
 copy_mm+0x13c/0x4b0 kernel/fork.c:1541
 copy_process+0x1706/0x3c00 kernel/fork.c:2181
 kernel_clone+0x21e/0x840 kernel/fork.c:2609
 __do_sys_clone kernel/fork.c:2750 [inline]
 __se_sys_clone kernel/fork.c:2734 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2734
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f507bd85613
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007f507c10fca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f507bd85613
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555953867d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000049a3c R15: 00007f507c10fe40
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g13889 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=8049
rcu: rcu_preempt kthread starved for 10502 jiffies! g13889 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:27224 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>