rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=59a4/1/0x4000000000000000 softirq=15082/15084 fqs=2 rcu: (detected by 0, t=10502 jiffies, g=11949, q=1101 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 7006 Comm: syz-executor Not tainted 6.12.0-rc6-syzkaller-00110-gff7afaeca1a1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:kasan_check_range+0x1bf/0x290 mm/kasan/generic.c:189 Code: 48 85 ed 48 0f 49 dd 48 83 e3 f8 48 29 dd 74 12 41 80 3b 00 0f 85 a6 00 00 00 49 ff c3 48 ff cd 75 ee 5b 41 5c 41 5e 41 5f 5d cc cc cc cc 40 84 ed 75 5f f7 c5 00 ff 00 00 75 5c f7 c5 00 00 RSP: 0018:ffffc90000a18908 EFLAGS: 00000056 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81706081 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff94297800 RBP: 9feb8235be99f827 R08: ffffffff94297807 R09: 1ffffffff2852f00 R10: dffffc0000000000 R11: fffffbfff2852f01 R12: 0000000000000000 R13: ffff888054a228d8 R14: 1ffff1100a944525 R15: ffff888054a22928 FS: 0000555583d77500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5d39c27ae3 CR3: 00000000349d0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] hlock_class kernel/locking/lockdep.c:228 [inline] __lock_acquire+0x12a1/0x2050 kernel/locking/lockdep.c:5199 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:syscall_enter_from_user_mode_work include/linux/entry-common.h:167 [inline] RIP: 0010:syscall_enter_from_user_mode include/linux/entry-common.h:198 [inline] RIP: 0010:do_syscall_64+0xbc/0x230 arch/x86/entry/common.c:79 Code: ed 00 00 00 48 8b 7d 08 e8 f1 64 00 00 0f 1f 44 00 00 0f 1f 44 00 00 90 e8 a1 5c de f5 90 90 e8 4a 5c de f5 fb 49 8b 54 24 08 c2 3f 74 0e 4c 89 f7 4c 89 fe e8 84 52 c0 f5 49 89 c7 90 90 41 RSP: 0018:ffffc90002e5ff10 EFLAGS: 00000282 RAX: b21d9f4f4e3f3f00 RBX: ffffc90002e5ff10 RCX: ffffffff9a39e903 RDX: 0000000000000000 RSI: ffffffff8c0acac0 RDI: ffffffff8c6035a0 RBP: ffffc90002e5ff48 R08: ffffffff901bdc6f R09: 1ffffffff2037b8d R10: dffffc0000000000 R11: fffffbfff2037b8e R12: ffff888054a21e00 R13: 0000000000000000 R14: ffffc90002e5ff58 R15: 000000000000010a entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5d39b7dc97 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0a 01 00 00 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:00007ffdaff9e498 EFLAGS: 00000202 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5d39b7dc97 RDX: 00007f5d39bf2ad2 RSI: 00000000ffffff9c RDI: 00007ffdaff9e520 RBP: 00007ffdaff9e4cc R08: 0000000000000013 R09: 00007ffdaff9e1e7 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000032 R13: 0000000000019672 R14: 0000000000018906 R15: 00007ffdaff9e520 rcu: rcu_preempt kthread starved for 10498 jiffies! g11949 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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:25824 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x17fa/0x4bd0 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 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 7004 Comm: syz.1.467 Not tainted 6.12.0-rc6-syzkaller-00110-gff7afaeca1a1 #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 86 f3 0b 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 31 ef 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 15 ef RSP: 0018:ffffc90002def3e0 EFLAGS: 00000246 RAX: ffffffff8188eaeb RBX: 1ffff110170e8911 RCX: 0000000000040000 RDX: ffffc900046a2000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc90002def5e0 R08: ffffffff8188eaba R09: 1ffffffff2852f00 R10: dffffc0000000000 R11: fffffbfff2852f01 R12: dffffc0000000000 R13: ffff8880b8744888 R14: ffff8880b863fc40 R15: 0000000000000001 FS: 00007f8dddcce6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2f738a CR3: 000000002c560000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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:2085 [inline] text_poke_bp_batch+0x726/0xb30 arch/x86/kernel/alternative.c:2357 text_poke_bp+0xb0/0x100 arch/x86/kernel/alternative.c:2522 __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:317 [inline] tracepoint_add_func+0x918/0x9e0 kernel/tracepoint.c:358 tracepoint_probe_register_prio_may_exist+0x122/0x190 kernel/tracepoint.c:482 bpf_raw_tp_link_attach+0x48b/0x6e0 kernel/bpf/syscall.c:3849 bpf_raw_tracepoint_open+0x177/0x1f0 kernel/bpf/syscall.c:3880 __sys_bpf+0x3c0/0x810 kernel/bpf/syscall.c:5695 __do_sys_bpf kernel/bpf/syscall.c:5760 [inline] __se_sys_bpf kernel/bpf/syscall.c:5758 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5758 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: 0033:0x7f8ddcf7e719 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:00007f8dddcce038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f8ddd135f80 RCX: 00007f8ddcf7e719 RDX: 0000000000000010 RSI: 0000000020001580 RDI: 0000000000000011 RBP: 00007f8ddcff139e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8ddd135f80 R15: 00007ffee87bd6a8