rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 ticks this GP) idle=067/1/0x4000000000000000 softirq=20666/20666 fqs=5246 (detected by 1, t=10502 jiffies, g=28169, q=1032) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9344 Comm: syz.0.1337 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:65 Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 RSP: 0018:ffffc90002e3e9b8 EFLAGS: 00000002 RAX: 0000000000000000 RBX: ffffc90002e3eb00 RCX: 0000000000000000 RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90002e3eb60 RBP: ffffc90002e3eb48 R08: dffffc0000000000 R09: ffffc90002e3eb50 R10: fffff520005c7d6c R11: 1ffff920005c7d6a R12: 1ffffffff1bdc685 R13: dffffc0000000000 R14: ffffc90002e3eb50 R15: ffffc90002e3eb35 FS: 00007fc693ab76c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000002 CR3: 0000000025624000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: unwind_next_frame+0xa3d/0x1d90 arch/x86/kernel/unwind_orc.c:547 perf_callchain_kernel+0x4eb/0x650 arch/x86/events/core.c:2783 get_perf_callchain+0x376/0x480 kernel/events/callchain.c:200 perf_callchain kernel/events/core.c:7606 [inline] perf_prepare_sample+0x352/0x1cb0 kernel/events/core.c:7633 __perf_event_output kernel/events/core.c:7802 [inline] perf_event_output_forward+0x146/0x280 kernel/events/core.c:7822 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515 perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021 perf_trace_preemptirq_template+0x2be/0x380 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ed 11 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc90002e3f420 EFLAGS: 00000206 RAX: 81572a0928cce400 RBX: 1ffff920005c7e88 RCX: 81572a0928cce400 RDX: dffffc0000000000 RSI: ffffffff8a0b1c60 RDI: ffffffff8a59e580 RBP: ffffc90002e3f4e8 R08: dffffc0000000000 R09: ffffed1017207662 R10: ffffed1017207662 R11: 1ffff11017207661 R12: ffffffff8c120c00 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] percpu_ref_put_many include/linux/percpu-refcount.h:324 [inline] percpu_ref_put+0xcc/0x150 include/linux/percpu-refcount.h:338 memcg_kmem_uncharge_page include/linux/memcontrol.h:1703 [inline] free_thread_stack+0xda/0x430 kernel/fork.c:283 release_task_stack kernel/fork.c:433 [inline] put_task_stack+0x97/0x140 kernel/fork.c:444 finish_task_switch+0x26f/0x640 kernel/sched/core.c:4961 context_switch kernel/sched/core.c:5052 [inline] __schedule+0x11c3/0x4390 kernel/sched/core.c:6395 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799 irqentry_exit+0x63/0x70 kernel/entry/common.c:432 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:memcg_slab_free_hook+0x127/0x1f0 mm/slab.h:360 Code: 44 29 eb 41 0f b6 cc 83 f9 20 73 68 44 89 e1 d3 eb 49 c1 ef 28 44 01 eb 41 0f b6 cf 83 f9 20 73 7c 44 89 f9 d3 eb 4d 8b 3c de <4d> 85 ff 4c 8b 64 24 18 4c 8b 6c 24 10 0f 84 35 ff ff ff 49 c7 04 RSP: 0018:ffffc90002e3f978 EFLAGS: 00000202 RAX: ffffea00017ec200 RBX: 0000000000000015 RCX: 0000000000000009 RDX: ffffea0000000000 RSI: 0000000000057be8 RDI: ffff88801684fdc0 RBP: 0000000000000000 R08: ffff88805fb08000 R09: 000000000017000e R10: fffffbfff1ad33a6 R11: 1ffffffff1ad33a5 R12: 0000000000000901 R13: 0000000000001a40 R14: ffff88805b7c9000 R15: ffff88807d1d4a00 do_slab_free mm/slub.c:3437 [inline] ___cache_free+0x63/0x120 mm/slub.c:3511 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc_trace+0x103/0x2a0 mm/slub.c:3250 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] btf_parse kernel/bpf/btf.c:4323 [inline] btf_new_fd+0x110/0x910 kernel/bpf/btf.c:5920 __sys_bpf+0x51c/0x670 kernel/bpf/syscall.c:4702 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline] __se_sys_bpf kernel/bpf/syscall.c:4759 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fc6958506c9 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:00007fc693ab7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fc695aa6fa0 RCX: 00007fc6958506c9 RDX: 0000000000000028 RSI: 0000200000000000 RDI: 0000000000000012 RBP: 00007fc6958d2f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc695aa7038 R14: 00007fc695aa6fa0 R15: 00007ffec4ede678