rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=7914/1/0x4000000000000000 softirq=45314/45314 fqs=0 rcu: (detected by 1, t=10502 jiffies, g=59913, q=171 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 13850 Comm: syz.1.2692 Not tainted 6.11.0-rc2-syzkaller-00004-gb446a2dae984 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 RIP: 0010:__lock_acquire+0x1400/0x2040 Code: b6 04 10 84 c0 0f 85 b1 09 00 00 41 8b 45 00 ff c0 41 89 45 00 83 f8 30 0f 83 5e 02 00 00 3b 05 e6 17 df 11 0f 87 bd 02 00 00 <41> be 01 00 00 00 44 89 f0 48 81 c4 90 00 00 00 5b 41 5c 41 5d 41 RSP: 0018:ffffc900000077f0 EFLAGS: 00000097 RAX: 0000000000000002 RBX: ffff88802b9bc6d0 RCX: e3bcc02f69772500 RDX: dffffc0000000000 RSI: ffff88802b9bc708 RDI: ffff88802b9bbc00 RBP: 71a5d68fa1cc311c R08: ffffffff934ee807 R09: 1ffffffff269dd00 R10: dffffc0000000000 R11: fffffbfff269dd01 R12: 0000000000000000 R13: ffff88802b9bc6d8 R14: 0000000000000000 R15: ffff88802b9bc728 FS: 00007fd8a7e686c0(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020003c80 CR3: 000000002c7e8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 debug_objects_fill_pool+0x9f/0x9b0 lib/debugobjects.c:615 debug_object_activate+0x135/0x510 lib/debugobjects.c:705 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:1706 [inline] __hrtimer_run_queues+0x6cb/0xd50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5062 Code: c9 50 e8 d9 b6 0b 00 48 83 c4 08 4c 89 f7 e8 7d 38 00 00 e9 de 04 00 00 4c 89 f7 e8 20 4a 53 0a e8 0b d7 36 00 fb 48 8b 5d c0 <48> 8d bb f8 15 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc RSP: 0018:ffffc9000a777628 EFLAGS: 00000282 RAX: e3bcc02f69772500 RBX: ffff88802b9bbc00 RCX: ffffffff94ce6903 RDX: dffffc0000000000 RSI: ffffffff8bead560 RDI: ffffffff8c3f8940 RBP: ffffc9000a777670 R08: ffffffff8ff6956f R09: 1ffffffff1fed2ad R10: dffffc0000000000 R11: fffffbfff1fed2ae R12: 1ffff11017247eeb R13: dffffc0000000000 R14: ffff8880b923e9c0 R15: ffff8880b923f758 context_switch kernel/sched/core.c:5191 [inline] __schedule+0x17b6/0x4a10 kernel/sched/core.c:6529 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 RIP: 0010:_compound_head include/linux/page-flags.h:240 [inline] RIP: 0010:virt_to_folio include/linux/mm.h:1292 [inline] RIP: 0010:virt_to_slab mm/slab.h:206 [inline] RIP: 0010:__memcg_slab_post_alloc_hook+0x279/0x7e0 mm/memcontrol.c:3016 Code: 3d f6 42 ff 49 89 c6 49 c1 ee 06 49 83 e6 c0 48 b8 00 00 00 00 00 ea ff ff 4a 8d 5c 30 08 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <74> 08 48 89 df e8 bd cd f7 ff 48 8b 03 a8 01 0f 85 e0 02 00 00 48 RSP: 0018:ffffc9000a777a00 EFLAGS: 00000246 RAX: 1ffffd4000121441 RBX: ffffea000090a208 RCX: 0000000000040000 RDX: ffffc9000c37e000 RSI: 0000000000000683 RDI: 0000000000000684 RBP: ffffc9000a777aa8 R08: ffffffff8142b2ec R09: 1ffffffff1fed2ad R10: dffffc0000000000 R11: fffffbfff1fed2ae R12: ffffc9000a777aa8 R13: 1ffff920014eef55 R14: 000000000090a200 R15: dffffc0000000000 memcg_slab_post_alloc_hook mm/slub.c:2160 [inline] slab_post_alloc_hook mm/slub.c:3998 [inline] slab_alloc_node mm/slub.c:4037 [inline] __kmalloc_cache_noprof+0x1f4/0x2c0 mm/slub.c:4184 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] bpf_prog_alloc_no_stats+0xd8/0x4b0 kernel/bpf/core.c:108 bpf_prog_alloc+0x3a/0x1b0 kernel/bpf/core.c:145 bpf_prog_load+0x7f7/0x20f0 kernel/bpf/syscall.c:2818 __sys_bpf+0x4ee/0x810 kernel/bpf/syscall.c:5710 __do_sys_bpf kernel/bpf/syscall.c:5817 [inline] __se_sys_bpf kernel/bpf/syscall.c:5815 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5815 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: 0033:0x7fd8a71779f9 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:00007fd8a7e68048 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fd8a7306058 RCX: 00007fd8a71779f9 RDX: 0000000000000090 RSI: 00000000200000c0 RDI: 0000000000000005 RBP: 00007fd8a71e58ee R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fd8a7306058 R15: 00007ffd941ca7c8 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g59913 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=44736 rcu: rcu_preempt kthread starved for 10502 jiffies! g59913 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26448 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236 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