rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=4cd/1/0x4000000000000000 softirq=18354/18356 fqs=2100 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8617 (detected by 1, t=10505 jiffies, g=24129, q=1527) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8617 Comm: syz.4.1065 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:perf_swevent_overflow kernel/events/core.c:9591 [inline] RIP: 0010:perf_swevent_event+0x509/0x530 kernel/events/core.c:9629 Code: ff ff 89 c3 31 ff 89 c6 e8 14 94 e0 ff 49 ff cc 31 ff 4c 89 e6 e8 87 94 e0 ff 85 db 75 13 4d 85 e4 74 0e e8 99 90 e0 ff eb c5 92 90 e0 ff eb 0c e8 8b 90 e0 ff eb 05 e8 84 90 e0 ff 48 83 c4 RSP: 0018:ffffc90000007928 EFLAGS: 00000046 RAX: ffffffff81989035 RBX: 0000000000000000 RCX: ffff888027d83b80 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000007 R08: ffffffff8d89e36f R09: 1ffffffff1b13c6d R10: dffffc0000000000 R11: fffffbfff1b13c6e R12: 0000000000000000 R13: ffff8880610441a8 R14: ffff8880b90351c8 R15: ffffc90000007a00 FS: 00007f41400c86c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffdcb6ae00 CR3: 0000000055970000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600 Call Trace: perf_tp_event+0x383/0xbf0 kernel/events/core.c:10047 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021 perf_trace_preemptirq_template+0x2aa/0x360 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:ffs arch/x86/include/asm/bitops.h:297 [inline] RIP: 0010:handle_softirqs+0x1a9/0x830 kernel/softirq.c:564 Code: 24 78 44 89 64 24 28 0f b7 db 48 c7 c7 80 0f 2a 8a e8 5b 38 73 08 65 66 c7 05 61 57 ba 7e 00 00 e8 2c 0b 36 00 fb 89 5c 24 34 ff ff ff ff 0f bc 44 24 34 41 89 c5 41 ff c5 0f 85 d2 00 00 00 RSP: 0018:ffffc90000007e20 EFLAGS: 00000282 RAX: 9b487a734ee71d00 RBX: 0000000000000200 RCX: 9b487a734ee71d00 RDX: dffffc0000000000 RSI: ffffffff8a2b2780 RDI: ffffffff8a79f980 RBP: ffffc90000007f30 R08: ffff8880b903b30b R09: 1ffff11017207661 R10: dffffc0000000000 R11: ffffed1017207662 R12: 000000000000000a R13: 0000000000000000 R14: ffff888027d83b80 R15: dffffc0000000000 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:__rcu_read_unlock+0x73/0xd0 kernel/rcu/tree_plugin.h:422 Code: 84 c0 75 5f 41 83 3e 00 75 20 43 0f b6 04 3c 84 c0 75 3a 8b 03 3d 00 00 00 40 73 0a 5b 41 5c 41 5d 41 5e 41 5f c3 0f 0b eb f2 58 00 00 00 eb d9 89 d9 80 e1 07 80 c1 03 38 c1 7c ac 49 89 fe RSP: 0018:ffffc90003cafb60 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff888027d83fbc RCX: 0000000000080000 RDX: ffffc9000dec9000 RSI: 000000000007ffff RDI: ffff888027d83b80 RBP: 0000000000000001 R08: ffff8880b903b30b R09: 1ffff11017207661 R10: dffffc0000000000 R11: ffffed1017207662 R12: 1ffff11004fb07f7 R13: ffff88807c0a1818 R14: ffff888027d83fc0 R15: dffffc0000000000 rcu_read_unlock include/linux/rcupdate.h:772 [inline] bpf_percpu_hash_update+0x194/0x1d0 kernel/bpf/hashtab.c:2245 bpf_map_update_value+0x25e/0x650 kernel/bpf/syscall.c:198 generic_map_update_batch+0x52d/0x7d0 kernel/bpf/syscall.c:1430 bpf_map_do_batch+0x466/0x600 kernel/bpf/syscall.c:-1 __sys_bpf+0x671/0x6f0 kernel/bpf/syscall.c:-1 __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: 0033:0x7f4141e6e819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f41400c8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f41420e7fa0 RCX: 00007f4141e6e819 RDX: 0000000000000038 RSI: 00002000000006c0 RDI: 000000000000001a RBP: 00007f4141f04c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f41420e8038 R14: 00007f41420e7fa0 R15: 00007fff46a3d1d8 task:syz.4.1065 state:R running task stack:25008 pid: 8617 ppid: 4191 flags:0x0000400c Call Trace: