rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=f9dc/1/0x4000000000000000 softirq=20460/20460 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=15613, q=1097 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6150 Comm: syz-execprog Not tainted 6.15.0-syzkaller-12425-g82cbd06f327f #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:146 [inline]
RIP: 0010:lock_acquire+0xee/0x360 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 4c 89 74 24 10 4d 89 fe 4c 8b 7c 24 30 fa 48 c7 c7 ca 07 99 8d e8 e9 9d c7 09 65 ff 05 e2 ba fe 10 <45> 31 c9 4c 89 7c 24 08 41 f7 c7 00 02 00 00 41 0f 94 c1 4c 89 ef
RSP: 0018:ffffc90000a08bd0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 645cab9a7fcd2000
RDX: 0000000000000000 RSI: ffffffff8d9907ca RDI: ffffffff8be28340
RBP: ffffffff89856d08 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100f299e5e R12: 0000000000000002
R13: ffffffff8e13f060 R14: 0000000000000000 R15: 0000000000000046
FS:  000000c000060098(0000) GS:ffff888125d55000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff4fc355e9c CR3: 00000000781ca000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 advance_sched+0xa14/0xc90 net/sched/sch_taprio.c:985
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x529/0xc60 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+0x108/0x410 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:pagefault_disabled include/linux/uaccess.h:284 [inline]
RIP: 0010:__might_fault+0x3e/0x130 mm/memory.c:6987
Code: bc 00 00 00 00 00 fc ff df e8 fe 11 b4 ff 65 48 8b 1c 25 08 b0 9c 92 4c 8d bb a4 17 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 20 <84> c0 0f 85 be 00 00 00 45 8b 3f 31 ff 44 89 fe e8 0d 16 b4 ff 45
RSP: 0018:ffffc90004aefd28 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: ffff888031608000 RCX: ffff888031608000
RDX: 0000000000000000 RSI: 00000000000000a2 RDI: ffffffff8be23b00
RBP: 00000000000000a2 R08: ffffc90004aefdaf R09: 0000000000000000
R10: ffffc90004aefda0 R11: fffff5200095dfb6 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff8be23b00 R15: ffff8880316097a4
 _inline_copy_from_user include/linux/uaccess.h:162 [inline]
 _copy_from_user+0x28/0xb0 lib/usercopy.c:18
 copy_from_user include/linux/uaccess.h:212 [inline]
 get_timespec64+0x8e/0x1a0 kernel/time/time.c:877
 __do_sys_nanosleep kernel/time/hrtimer.c:2173 [inline]
 __se_sys_nanosleep kernel/time/hrtimer.c:2168 [inline]
 __x64_sys_nanosleep+0xc5/0x290 kernel/time/hrtimer.c:2168
 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: 0033:0x474657
Code: 8b 44 24 20 b9 40 42 0f 00 f7 f1 48 89 04 24 b8 e8 03 00 00 f7 e2 48 89 44 24 08 48 89 e7 be 00 00 00 00 b8 23 00 00 00 0f 05 <48> 83 c4 10 5d c3 cc cc cc b8 ba 00 00 00 0f 05 89 44 24 08 c3 cc
RSP: 002b:000000c000043f18 EFLAGS: 00000202 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 0000000000474657
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000c000043f18
RBP: 000000c000043f28 R08: 0000000028904baa R09: 7fffffffffffffff
R10: 3fffffffffffffff R11: 0000000000000202 R12: 000000c000043f18
R13: 000000c000060008 R14: 000000c000006540 R15: 0fffffffffffffff
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g15613 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=4977
rcu: rcu_preempt kthread starved for 10502 jiffies! g15613 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:27128 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6878
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 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>