rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=dd4c/1/0x4000000000000000 softirq=74086/74087 fqs=71 rcu: (detected by 1, t=10502 jiffies, g=66189, q=512 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 13089 Comm: syz.9.2154 Not tainted 6.12.0-syzkaller-10553-gb86545e02e8c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1765 [inline] RIP: 0010:__hrtimer_run_queues+0x710/0xd50 kernel/time/hrtimer.c:1803 Code: 24 20 48 8b 74 24 60 42 0f b6 04 2e 84 c0 48 8b 54 24 18 0f 85 ca 01 00 00 ff 02 42 0f b6 04 2e 84 c0 0f 85 e4 01 00 00 ff 02 <48> 8b 44 24 68 42 80 3c 28 00 74 08 48 89 df e8 fc 57 7a 00 4c 39 RSP: 0018:ffffc90000007d40 EFLAGS: 00000012 RAX: 0000000000000000 RBX: ffff8880b862c9c8 RCX: dffffc0000000000 RDX: ffff8880b862c990 RSI: 1ffff110170c5932 RDI: ffff888065e77340 RBP: ffffc90000007ea0 R08: ffff888065e77357 R09: 0000000000000000 R10: ffff888065e77348 R11: ffffed100cbcee6b R12: 1ffff110170c593b R13: dffffc0000000000 R14: ffff888065e77340 R15: ffff8880b862c880 FS: 00007f01501c36c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3281eff8 CR3: 000000005d548000 CR4: 00000000003526f0 DR0: fffffffffffffffc DR1: 00000000000000fc DR2: 0000000000000002 DR3: 000000000000023f DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865 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 2e 5d 29 f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 e3 af 8f f5 65 8b 05 74 91 2f 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc9000419f8c0 EFLAGS: 00000206 RAX: 3d99bf5aed2d4800 RBX: 1ffff92000833f1c RCX: ffffffff9a3f7903 RDX: dffffc0000000000 RSI: ffffffff8c0ad980 RDI: 0000000000000001 RBP: ffffc9000419f958 R08: ffffffff901d3037 R09: 1ffffffff203a606 R10: dffffc0000000000 R11: fffffbfff203a607 R12: dffffc0000000000 R13: 1ffff92000833f18 R14: ffffc9000419f8e0 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] timerfd_clock_was_set+0x1e0/0x2f0 fs/timerfd.c:111 clock_was_set+0x78e/0x810 kernel/time/hrtimer.c:969 timekeeping_inject_offset+0x3d2/0x520 kernel/time/timekeeping.c:1480 do_adjtimex+0x5b1/0xb10 kernel/time/timekeeping.c:2579 do_clock_adjtime kernel/time/posix-timers.c:1165 [inline] __do_sys_clock_adjtime kernel/time/posix-timers.c:1177 [inline] __se_sys_clock_adjtime kernel/time/posix-timers.c:1168 [inline] __x64_sys_clock_adjtime+0x1e1/0x290 kernel/time/posix-timers.c:1168 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: 0033:0x7f014f380809 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:00007f01501c3058 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 00007f014f545fa0 RCX: 00007f014f380809 RDX: 0000000000000000 RSI: 0000000020000480 RDI: 0000000000000000 RBP: 00007f014f3f393e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f014f545fa0 R15: 00007ffc02a5b628 rcu: rcu_preempt kthread starved for 10353 jiffies! g66189 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:25976 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x17fb/0x4be0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 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 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 13095 Comm: syz.8.2156 Not tainted 6.12.0-syzkaller-10553-gb86545e02e8c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x19f3/0x2ca0 kernel/smp.c:884 Code: 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 36 ea 0b 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 e1 e5 0b 00 eb 38 f3 90 <42> 0f b6 04 23 84 c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 c5 e5 RSP: 0018:ffffc900041ef3e0 EFLAGS: 00000246 RAX: ffffffff8189fe6b RBX: 1ffff110170c8c65 RCX: 0000000000080000 RDX: ffffc900117a7000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc900041ef5e0 R08: ffffffff8189fe3a R09: 1ffffffff285e110 R10: dffffc0000000000 R11: fffffbfff285e111 R12: dffffc0000000000 R13: ffff8880b8646328 R14: ffff8880b873f940 R15: 0000000000000000 FS: 00007f1e6f9aa6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c31dff8 CR3: 000000004ff82000 CR4: 00000000003526f0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1051 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2114 [inline] text_poke_bp_batch+0x352/0xb30 arch/x86/kernel/alternative.c:2324 text_poke_bp+0xb0/0x100 arch/x86/kernel/alternative.c:2551 __static_call_transform+0x51a/0x810 arch/x86/kernel/static_call.c:111 arch_static_call_transform+0x141/0x380 arch/x86/kernel/static_call.c:163 __static_call_update+0xd8/0x5e0 kernel/static_call_inline.c:147 tracepoint_update_call kernel/tracepoint.c:271 [inline] tracepoint_add_func+0x925/0xaa0 kernel/tracepoint.c:312 tracepoint_probe_register_prio_may_exist+0x122/0x190 kernel/tracepoint.c:435 bpf_raw_tp_link_attach+0x4a3/0x700 kernel/bpf/syscall.c:3981 bpf_raw_tracepoint_open+0x177/0x1f0 kernel/bpf/syscall.c:4012 __sys_bpf+0x3c0/0x810 kernel/bpf/syscall.c:5832 __do_sys_bpf kernel/bpf/syscall.c:5897 [inline] __se_sys_bpf kernel/bpf/syscall.c:5895 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5895 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: 0033:0x7f1e6eb80809 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:00007f1e6f9aa058 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f1e6ed45fa0 RCX: 00007f1e6eb80809 RDX: 0000000000000010 RSI: 0000000020000180 RDI: 0000000000000011 RBP: 00007f1e6ebf393e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1e6ed45fa0 R15: 00007ffe44153608