rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=7854/1/0x4000000000000000 softirq=29403/29403 fqs=0 rcu: (detected by 0, t=10506 jiffies, g=19073, q=151 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 7791 Comm: syz.1.488 Not tainted 6.15.0-syzkaller-09161-g0f70f5b08a47 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:debug_object_activate+0xb2/0x4c0 lib/debugobjects.c:806 Code: 24 68 48 c7 44 24 60 00 00 00 00 48 c7 44 24 50 00 00 00 00 48 c7 44 24 58 00 00 00 00 c7 44 24 60 05 00 00 00 48 89 74 24 70 <48> 89 74 24 18 75 4a 31 d2 48 b8 00 00 00 00 00 fc ff df 4d 8d 0c RSP: 0018:ffffc90000a08d20 EFLAGS: 00000002 RAX: 0000000000000000 RBX: ffff8880b8527d40 RCX: ffffffff81a8bc66 RDX: ffff88802ca64880 RSI: ffffffff8bafee80 RDI: ffff888062301340 RBP: ffffc90000a08e08 R08: 0000000000000001 R09: ffffc90000a08d40 R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff888062301340 R15: 1ffff920001411a8 FS: 00007f669aa4b6c0(0000) GS:ffff88812486e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6699c4db21 CR3: 000000005e1f3000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline] debug_activate kernel/time/hrtimer.c:484 [inline] enqueue_hrtimer+0x23/0x3b0 kernel/time/hrtimer.c:1088 __run_hrtimer kernel/time/hrtimer.c:1778 [inline] __hrtimer_run_queues+0x8ff/0xad0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x108/0x3f0 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050 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+0x31/0x80 kernel/locking/spinlock.c:194 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 a6 74 19 f6 48 89 df e8 8e c8 19 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 25 f0 09 f6 65 8b 05 2e 22 4c 08 85 c0 74 16 5b RSP: 0018:ffffc9000ce77ca8 EFLAGS: 00000246 RAX: 0000000000000002 RBX: ffff8880b8427c40 RCX: 0000000000000007 RDX: 0000000000000000 RSI: ffffffff8de06e7d RDI: ffffffff8c153200 RBP: 0000000000000283 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90a78757 R11: 0000000000000001 R12: 0000000000000004 R13: 1bc16d34833e6ab6 R14: dffffc0000000000 R15: ffff8880b8427c40 clock_was_set+0x599/0x870 kernel/time/hrtimer.c:972 do_settimeofday64+0x323/0x4d0 kernel/time/timekeeping.c:1407 do_sys_settimeofday64+0x1dc/0x260 kernel/time/time.c:195 __do_sys_clock_settime kernel/time/posix-timers.c:1132 [inline] __se_sys_clock_settime kernel/time/posix-timers.c:1116 [inline] __x64_sys_clock_settime+0x1c1/0x2a0 kernel/time/posix-timers.c:1116 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6699b8e969 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:00007f669aa4b038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3 RAX: ffffffffffffffda RBX: 00007f6699db5fa0 RCX: 00007f6699b8e969 RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000 RBP: 00007f6699c10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6699db5fa0 R15: 00007ffc427cf5a8 rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g19073 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=14366 rcu: rcu_preempt kthread starved for 10506 jiffies! g19073 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:27688 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5392 [inline] __schedule+0x116a/0x5de0 kernel/sched/core.c:6781 __schedule_loop kernel/sched/core.c:6859 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6874 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2054 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2256 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245