rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=15b4/1/0x4000000000000000 softirq=60562/60562 fqs=0 rcu: (detected by 0, t=10505 jiffies, g=84777, q=129 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 15974 Comm: syz.3.3248 Not tainted 6.11.0-rc5-syzkaller-00310-ge8784b0aef62 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:109 [inline] RIP: 0010:do_raw_spin_lock+0x122/0x370 kernel/locking/spinlock_debug.c:116 Code: 24 30 4c 8d 74 24 60 48 89 5c 24 18 8b 03 65 8b 0d ff a5 92 7e 39 c8 0f 84 21 01 00 00 4d 89 f5 49 c1 ed 03 41 0f b6 44 15 00 <84> c0 48 89 d3 0f 85 a2 01 00 00 c7 44 24 60 00 00 00 00 4c 89 e7 RSP: 0018:ffffc90000a18ba0 EFLAGS: 00000802 RAX: 0000000000000004 RBX: ffff8880273f72f0 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: 1ffff9200014317c RDI: ffff8880273f72e8 RBP: ffffc90000a18c80 R08: ffffffff93fa6a17 R09: 1ffffffff27f4d42 R10: dffffc0000000000 R11: fffffbfff27f4d43 R12: ffff8880273f72e8 R13: 1ffff92000143180 R14: ffffc90000a18c00 R15: 1ffff11004e7ee5e FS: 00007fa088bfb6c0(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000066e4e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: spin_lock include/linux/spinlock.h:351 [inline] advance_sched+0xab/0xca0 net/sched/sch_taprio.c:924 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 8e 98 3c f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 b3 ea a7 f5 65 8b 05 14 c1 48 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc9000c13fa20 EFLAGS: 00000206 RAX: 35966d6b2c16ac00 RBX: 1ffff92001827f48 RCX: ffffffff9a0fd903 RDX: dffffc0000000000 RSI: ffffffff8bead560 RDI: 0000000000000001 RBP: ffffc9000c13fab0 R08: ffffffff8ff7426f R09: 1ffffffff1fee84d R10: dffffc0000000000 R11: fffffbfff1fee84e R12: dffffc0000000000 R13: 1ffff92001827f44 R14: ffffc9000c13fa40 R15: 0000000000000246 timekeeping_inject_offset+0x4de/0x580 kernel/time/timekeeping.c:1521 do_adjtimex+0x515/0xab0 kernel/time/timekeeping.c:2574 do_clock_adjtime kernel/time/posix-timers.c:1159 [inline] __do_sys_clock_adjtime kernel/time/posix-timers.c:1171 [inline] __se_sys_clock_adjtime kernel/time/posix-timers.c:1162 [inline] __x64_sys_clock_adjtime+0x1e1/0x290 kernel/time/posix-timers.c:1162 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa087d79eb9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa088bfb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 00007fa087f15f80 RCX: 00007fa087d79eb9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00007fa087de793e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa087f15f80 R15: 00007ffebb452c78 rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g84777 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=90275 rcu: rcu_preempt kthread starved for 10505 jiffies! g84777 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:24912 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244