rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=e6fc/1/0x4000000000000000 softirq=66692/66694 fqs=5 (detected by 0, t=10505 jiffies, g=84273, q=839 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 19408 Comm: syz-executor.4 Not tainted 6.1.55-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 RIP: 0010:do_raw_spin_lock+0x64/0x370 kernel/locking/spinlock_debug.c:113 Code: 40 b3 8a b5 41 48 c7 44 24 48 c9 9f 94 8c 48 c7 44 24 50 b0 97 6b 81 48 8d 74 24 40 48 c1 ee 03 48 b8 f1 f1 f1 f1 04 f3 f3 f3 <48> 89 f1 48 89 74 24 38 48 89 04 16 48 8d 5f 04 48 89 d8 48 c1 e8 RSP: 0018:ffffc900001e0a80 EFLAGS: 00000802 RAX: f3f3f304f1f1f1f1 RBX: 1ffff9200003c170 RCX: ffffffff816af3f5 RDX: dffffc0000000000 RSI: 1ffff9200003c158 RDI: ffffffff91f516f8 RBP: ffffc900001e0b50 R08: dffffc0000000000 R09: fffffbfff2092e45 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff91f516f8 R13: 1ffff9200003c16c R14: ffffffff91f516f8 R15: dffffc0000000000 FS: 00007f2d6c0926c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0944cffc02 CR3: 0000000042599000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline] _raw_spin_lock_irqsave+0xdd/0x120 kernel/locking/spinlock.c:162 debug_object_activate+0x16a/0x890 lib/debugobjects.c:706 debug_hrtimer_activate kernel/time/hrtimer.c:420 [inline] debug_activate kernel/time/hrtimer.c:475 [inline] enqueue_hrtimer+0x30/0x390 kernel/time/hrtimer.c:1084 __run_hrtimer kernel/time/hrtimer.c:1702 [inline] __hrtimer_run_queues+0x728/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x156/0x580 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:finish_task_switch+0x1d3/0x810 kernel/sched/core.c:5120 Code: 36 0b 00 48 83 c4 08 4c 89 f7 e8 68 30 00 00 0f 1f 44 00 00 4c 89 f7 e8 2b fd 33 09 e8 96 31 32 00 fb 49 8d bc 24 f8 15 00 00 <48> 89 f8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df 42 0f b6 04 28 RSP: 0018:ffffc9001571f8a8 EFLAGS: 00000286 RAX: 748eef88e455ae00 RBX: ffff888079b85974 RCX: ffffffff91c8f103 RDX: dffffc0000000000 RSI: ffffffff8aebe2a0 RDI: ffff8880378ad178 RBP: ffffc9001571f8f0 R08: dffffc0000000000 R09: ffffed10173273c1 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880378abb80 R13: 1ffff1101732756b R14: ffff8880b9939e00 R15: ffff8880b993ab58 context_switch kernel/sched/core.c:5244 [inline] __schedule+0x1435/0x4550 kernel/sched/core.c:6554 schedule+0xbf/0x180 kernel/sched/core.c:6630 futex_wait_queue+0x149/0x1d0 kernel/futex/waitwake.c:355 futex_wait+0x203/0x5c0 kernel/futex/waitwake.c:656 do_futex+0x3b5/0x490 kernel/futex/syscalls.c:106 __do_sys_futex kernel/futex/syscalls.c:183 [inline] __se_sys_futex+0x3d7/0x460 kernel/futex/syscalls.c:164 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f2d6b27cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2d6c092178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f2d6b39bf88 RCX: 00007f2d6b27cae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f2d6b39bf88 RBP: 00007f2d6b39bf80 R08: 00007f2d6c0926c0 R09: 00007f2d6c0926c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2d6b39bf8c R13: 000000000000000b R14: 00007ffc8e159470 R15: 00007ffc8e159558 rcu: rcu_preempt kthread starved for 10480 jiffies! g84273 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:25400 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5241 [inline] __schedule+0x142d/0x4550 kernel/sched/core.c:6554 schedule+0xbf/0x180 kernel/sched/core.c:6630 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1935 rcu_gp_fqs_loop+0x2c2/0x1010 kernel/rcu/tree.c:1661 rcu_gp_kthread+0xa3/0x3a0 kernel/rcu/tree.c:1860 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 PID: 19451 Comm: syz-executor.0 Not tainted 6.1.55-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 RIP: 0010:csd_lock_wait kernel/smp.c:413 [inline] RIP: 0010:smp_call_function_many_cond+0x1f62/0x33d0 kernel/smp.c:987 Code: 2f 44 89 ee 83 e6 01 31 ff e8 da 35 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 0a e8 65 32 0b 00 e9 1b ff ff ff f3 90 <42> 0f b6 04 2b 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 fe fe ff ff RSP: 0018:ffffc90015a1f240 EFLAGS: 00000246 RAX: ffffffff817f40cd RBX: 1ffff11017328031 RCX: 0000000000040000 RDX: ffffc90003ab1000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc90015a1f620 R08: ffffffff817f4096 R09: fffffbfff2092e45 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000800000000 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b9940188 FS: 00007fa6e6f6a6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31e21000 CR3: 000000001f5ad000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1155 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1316 [inline] text_poke_bp_batch+0x2bb/0x940 arch/x86/kernel/alternative.c:1516 text_poke_bp+0xc8/0x140 arch/x86/kernel/alternative.c:1753 __static_call_transform+0x333/0x560 arch/x86/kernel/static_call.c:109 arch_static_call_transform+0xcc/0x270 arch/x86/kernel/static_call.c:161 __static_call_update+0xd4/0x5c0 kernel/static_call_inline.c:136 tracepoint_update_call kernel/tracepoint.c:317 [inline] tracepoint_add_func+0x90c/0x9d0 kernel/tracepoint.c:358 tracepoint_probe_register_prio_may_exist+0x11e/0x190 kernel/tracepoint.c:482 bpf_raw_tp_link_attach+0x456/0x6b0 kernel/bpf/syscall.c:3335 bpf_raw_tracepoint_open+0x196/0x210 kernel/bpf/syscall.c:3362 __sys_bpf+0x4a7/0x6c0 kernel/bpf/syscall.c:5010 __do_sys_bpf kernel/bpf/syscall.c:5072 [inline] __se_sys_bpf kernel/bpf/syscall.c:5070 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5070 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa6e627cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa6e6f6a0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fa6e639bf80 RCX: 00007fa6e627cae9 RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000011 RBP: 00007fa6e62c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fa6e639bf80 R15: 00007ffdfacf67a8