rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=5e94/1/0x4000000000000000 softirq=32309/32309 fqs=0 rcu: (detected by 0, t=10502 jiffies, g=35169, q=337 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 8672 Comm: syz.6.891 Not tainted 6.12.0-rc4-syzkaller-00281-g284a2f899676 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:mark_usage kernel/locking/lockdep.c:4611 [inline] RIP: 0010:__lock_acquire+0xbb2/0x2050 kernel/locking/lockdep.c:5156 Code: 7c 10 00 00 48 8b 44 24 18 83 38 00 74 75 4c 89 e7 48 89 ee ba 05 00 00 00 eb 51 85 c0 74 22 45 31 f6 4c 89 e7 48 89 ee 31 d2 69 65 00 00 48 ba 00 00 00 00 00 fc ff df 85 c0 0f 84 47 08 00 RSP: 0018:ffffc90000a18910 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 1ffff11004aaa16a RCX: 00000000000c4001 RDX: 0000000000000000 RSI: ffff888025550b30 RDI: ffff888025550000 RBP: ffff888025550b30 R08: ffffffff9429780f R09: 1ffffffff2852f01 R10: dffffc0000000000 R11: fffffbfff2852f02 R12: ffff888025550000 R13: ffff888025550ad8 R14: 0000000000000000 R15: ffff888025550b50 FS: 00007f378ab206c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f378ab1ff98 CR3: 000000007ff10000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 debug_object_activate+0x16d/0x510 lib/debugobjects.c:708 debug_hrtimer_activate kernel/time/hrtimer.c:423 [inline] debug_activate kernel/time/hrtimer.c:478 [inline] enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1085 __run_hrtimer kernel/time/hrtimer.c:1708 [inline] __hrtimer_run_queues+0x6cb/0xd50 kernel/time/hrtimer.c:1755 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 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 ee 53 33 f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 f3 0e 9b f5 65 8b 05 14 a7 3b 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc90003f17920 EFLAGS: 00000206 RAX: 46c2fe71fa785000 RBX: 1ffff920007e2f28 RCX: ffffffff8170cf8a RDX: dffffc0000000000 RSI: ffffffff8c0acb40 RDI: 0000000000000001 RBP: ffffc90003f179b0 R08: ffffffff94297807 R09: 1ffffffff2852f00 R10: dffffc0000000000 R11: fffffbfff2852f01 R12: dffffc0000000000 R13: 1ffff920007e2f24 R14: ffffc90003f17940 R15: 0000000000000246 clock_was_set+0x686/0x810 kernel/time/hrtimer.c:968 timekeeping_inject_offset+0x4e8/0x580 kernel/time/timekeeping.c:1524 do_adjtimex+0x51d/0xae0 kernel/time/timekeeping.c:2575 do_clock_adjtime kernel/time/posix-timers.c:1174 [inline] __do_sys_clock_adjtime kernel/time/posix-timers.c:1186 [inline] __se_sys_clock_adjtime kernel/time/posix-timers.c:1177 [inline] __x64_sys_clock_adjtime+0x1e1/0x290 kernel/time/posix-timers.c:1177 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: 0033:0x7f3789d7e719 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:00007f378ab20038 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 00007f3789f35f80 RCX: 00007f3789d7e719 RDX: 0000000000000000 RSI: 0000000020000480 RDI: 0000000000000000 RBP: 00007f3789df132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f3789f35f80 R15: 00007ffe24665748 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g35169 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=12476 rcu: rcu_preempt kthread starved for 10502 jiffies! g35169 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:25552 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x185a/0x4b70 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6782 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 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