rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10497 ticks this GP) idle=b7b4/1/0x4000000000000000 softirq=13398/1478576 fqs=5242 rcu: hardirqs softirqs csw/system rcu: number: 2984253 737907 0 rcu: cputime: 2048 48452 1972 ==> 52500(ms) rcu: (t=10502 jiffies g=14209 q=2373 ncpus=2) CPU: 1 PID: 6386 Comm: syz.2.195 Not tainted 6.6.102-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:rb_event_length+0x14/0x3f0 kernel/trace/ring_buffer.c:197 Code: 80 e1 07 80 c1 03 38 c1 7c 9f 4c 89 f7 e8 c4 7c 55 00 eb 95 66 90 41 57 41 56 41 54 53 49 89 fe 49 bc 00 00 00 00 00 fc ff df 97 35 fe ff 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 8c RSP: 0018:ffffc900001f0470 EFLAGS: 00000202 RAX: ffffffff818890da RBX: 0000006bc05f5351 RCX: ffff88807dd25a00 RDX: 0000000000000100 RSI: ffffffff8cd79820 RDI: ffff88801ca71894 RBP: 0000000000000b04 R08: ffff88807dd25a00 R09: 0000000000000020 R10: 000000000000001f R11: 0000000000000100 R12: dffffc0000000000 R13: f800000000000000 R14: ffff88801ca71894 R15: 0000006bc05fbae9 FS: 00007f9a01b576c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c32a374 CR3: 0000000077ae8000 CR4: 00000000003506e0 Call Trace: check_buffer+0x542/0x950 kernel/trace/ring_buffer.c:3491 __rb_reserve_next+0x511/0xd50 kernel/trace/ring_buffer.c:3624 rb_reserve_next_event kernel/trace/ring_buffer.c:3759 [inline] ring_buffer_lock_reserve+0xae1/0xed0 kernel/trace/ring_buffer.c:3818 __trace_buffer_lock_reserve kernel/trace/trace.c:992 [inline] trace_event_buffer_lock_reserve+0x1d0/0x6e0 kernel/trace/trace.c:2902 trace_event_buffer_reserve+0x29b/0x3c0 kernel/trace/trace_events.c:661 do_trace_event_raw_event_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline] trace_event_raw_event_bpf_trace_printk+0x101/0x210 kernel/trace/bpf_trace.h:11 trace_bpf_trace_printk+0x142/0x1a0 kernel/trace/bpf_trace.h:11 ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline] bpf_trace_printk+0x11f/0x190 kernel/trace/bpf_trace.c:371 bpf_prog_9e1c00255e17e72e+0x38/0x3a bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline] __bpf_prog_run include/linux/filter.h:612 [inline] bpf_prog_run include/linux/filter.h:619 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline] bpf_trace_run1+0x1c9/0x3b0 kernel/trace/bpf_trace.c:2360 __bpf_trace_rcu_utilization+0xa2/0xe0 include/trace/events/rcu.h:27 trace_rcu_utilization+0x179/0x1a0 include/trace/events/rcu.h:27 rcu_core+0x1341/0x1720 kernel/rcu/tree.c:2475 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa1/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723 RIP: 0010:preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:7009 Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 63 bf 01 00 00 00 e8 4b da e5 f6 e8 46 5f 16 f7 fb bf 01 00 00 00 db b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc9001a2671e0 EFLAGS: 00000282 RAX: 524eecde05050b00 RBX: 0000000000000000 RCX: 524eecde05050b00 RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: 0000000000000001 RBP: ffffc9001a267280 R08: ffffffff90da3517 R09: 1ffffffff21b46a2 R10: dffffc0000000000 R11: fffffbfff21b46a3 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200344ce3c irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:lock_acquire+0x1f2/0x410 kernel/locking/lockdep.c:5758 Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 66 43 c7 44 3c 09 00 00 43 c6 44 3c 0b 00 RSP: 0018:ffffc9001a267340 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 524eecde05050b00 RDX: 0000000000000000 RSI: ffffffff8aaacb40 RDI: ffffffff8afc66c0 RBP: ffffc9001a267450 R08: dffffc0000000000 R09: 1ffffffff21b46a2 R10: dffffc0000000000 R11: fffffbfff21b46a3 R12: 1ffff9200344ce74 R13: ffffffff8ce27020 R14: 0000000000000246 R15: dffffc0000000000 fs_reclaim_acquire+0x98/0x100 mm/page_alloc.c:3587 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook+0x2a/0x310 mm/slab.h:714 slab_alloc_node mm/slub.c:3467 [inline] slab_alloc mm/slub.c:3493 [inline] __kmem_cache_alloc_lru mm/slub.c:3500 [inline] kmem_cache_alloc_lru+0x4d/0x2e0 mm/slub.c:3516 __d_alloc+0x31/0x730 fs/dcache.c:1773 d_alloc fs/dcache.c:1853 [inline] d_alloc_parallel+0xdd/0x1480 fs/dcache.c:2644 __lookup_slow+0x117/0x3b0 fs/namei.c:1679 lookup_slow+0x53/0x70 fs/namei.c:1711 walk_component fs/namei.c:2002 [inline] link_path_walk+0x970/0xe00 fs/namei.c:2329 path_openat+0x283/0x3190 fs/namei.c:3785 do_filp_open+0x1c5/0x3d0 fs/namei.c:3816 do_sys_openat2+0x12c/0x1c0 fs/open.c:1419 do_sys_open fs/open.c:1434 [inline] __do_sys_openat fs/open.c:1450 [inline] __se_sys_openat fs/open.c:1445 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1445 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f9a00d8d550 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 49 94 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 9c 94 02 00 8b 44 RSP: 002b:00007f9a01b56fe0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f9a00d8d550 RDX: 0000000000000002 RSI: 00007f9a00e120d3 RDI: 00000000ffffff9c RBP: 00007f9a00e120d3 R08: 0000000000000000 R09: 0000000000745d1e R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000000a R13: 00007f9a00fb6038 R14: 00007f9a00fb5fa0 R15: 00007ffda20b1dd8