rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=e3fc/1/0x4000000000000000 softirq=7998/8007 fqs=1 rcu: (detected by 1, t=10502 jiffies, g=5481, q=110 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5024 Comm: syz-executor164 Not tainted 6.5.0-rc6-syzkaller-00036-g4853c74bd7ab #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:taprio_set_budgets+0x19d/0x360 net/sched/sch_taprio.c:680 Code: ff 7f e9 88 00 00 00 e8 51 bc ae f8 48 8b 6c 24 18 48 8b 1c 24 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 48 89 ef e8 39 8e 07 f9 48 69 6d 00 e8 03 00 00 48 89 df be RSP: 0018:ffffc90000007c30 EFLAGS: 00000046 RAX: 1ffff110288f2780 RBX: ffff88801ab532e0 RCX: dffffc0000000000 RDX: 0000000080010002 RSI: 0000000000010000 RDI: 0000000000000000 RBP: ffff888144793c00 R08: ffffffff88dcfbc6 R09: fffff52000000f80 R10: dffffc0000000000 R11: fffff52000000f80 R12: 0000000000000000 R13: ffff888144793c00 R14: ffff888144793c00 R15: 0000000000000000 FS: 00005555574c7380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000600 CR3: 0000000072d43000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: advance_sched+0x993/0xc80 net/sched/sch_taprio.c:988 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x59f/0xd10 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x396/0x980 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1098 [inline] __sysvec_apic_timer_interrupt+0x13f/0x480 arch/x86/kernel/apic/apic.c:1115 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1109 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 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 b5 1d f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 b3 09 98 f6 65 8b 05 d4 e0 3c 75 85 c0 74 3f 48 c7 04 24 0e 36 RSP: 0018:ffffc90003b7f900 EFLAGS: 00000206 RAX: d9a652a42c06e200 RBX: 1ffff9200076ff24 RCX: ffffffff816bdd8a RDX: dffffc0000000000 RSI: ffffffff8b0a97e0 RDI: 0000000000000001 RBP: ffffc90003b7f990 R08: ffffffff907b4307 R09: 1ffffffff20f6860 R10: dffffc0000000000 R11: fffffbfff20f6861 R12: dffffc0000000000 R13: 1ffff9200076ff20 R14: ffffc90003b7f920 R15: 0000000000000246 clock_was_set+0x6a1/0x830 kernel/time/hrtimer.c:972 timekeeping_inject_offset+0x663/0x710 kernel/time/timekeeping.c:1395 do_adjtimex+0x515/0xab0 kernel/time/timekeeping.c:2444 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+0x1e0/0x290 kernel/time/posix-timers.c:1162 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc1cb60fee9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd6c04a108 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fc1cb60fee9 RDX: 00007fc1cb60fee9 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000100000000 R10: 0000000100000000 R11: 0000000000000246 R12: 00007ffd6c04a160 R13: 0000000000000001 R14: 00007ffd6c04a160 R15: 0000000000000003 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.575 msecs rcu: rcu_preempt kthread starved for 10500 jiffies! g5481 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:26952 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6710 schedule+0xc3/0x180 kernel/sched/core.c:6786 schedule_timeout+0x1bd/0x310 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x2c6/0x1010 kernel/rcu/tree.c:1609 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1808 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 47 Comm: kworker/u4:3 Not tainted 6.5.0-rc6-syzkaller-00036-g4853c74bd7ab #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:225 Code: e0 15 00 00 83 fa 02 75 21 48 8b 91 e8 15 00 00 48 8b 32 48 8d 7e 01 8b 89 e4 15 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 0f 1f 00 f3 0f 1e fa 4c 8b 04 24 65 48 8b 15 a0 fc 77 7e 65 8b RSP: 0018:ffffc90000b87778 EFLAGS: 00000293 RAX: ffffffff8180a437 RBX: 1ffff1101730897d RCX: ffff888015ee5940 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000b87980 R08: ffffffff8180a402 R09: 1ffffffff20f6860 R10: dffffc0000000000 R11: fffffbfff20f6861 R12: ffff8880b9844be8 R13: ffff8880b993d0c8 R14: ffff8880b993d0c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555574c7650 CR3: 000000000d130000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: csd_lock_wait kernel/smp.c:296 [inline] smp_call_function_many_cond+0x1877/0x27d0 kernel/smp.c:835 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1003 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2001 [inline] text_poke_bp_batch+0x2d7/0x960 arch/x86/kernel/alternative.c:2211 text_poke_flush arch/x86/kernel/alternative.c:2402 [inline] text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:2409 arch_jump_label_transform_apply+0x17/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x132/0x250 kernel/jump_label.c:205 static_key_enable+0x1a/0x20 kernel/jump_label.c:218 toggle_allocation_gate+0xb5/0x250 mm/kfence/core.c:831 process_one_work+0x92c/0x12c0 kernel/workqueue.c:2600 worker_thread+0xa63/0x1210 kernel/workqueue.c:2751 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304