rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-....: (1 GPs behind) idle=bfc4/1/0x4000000000000000 softirq=31314/31315 fqs=5250 rcu: hardirqs softirqs csw/system rcu: number: 8546054 0 0 rcu: cputime: 23753 0 0 ==> 52500(ms) rcu: (detected by 0, t=10502 jiffies, g=37441, q=1208 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10355 Comm: syz.2.1360 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:perf_tp_event+0x1463/0x1520 kernel/events/core.c:10405 Code: 08 4a 89 4c 38 10 4a 89 4c 38 18 4a 89 4c 38 20 48 c7 44 24 40 0e 36 e0 45 4a c7 04 38 00 00 00 00 4a c7 44 38 08 00 00 00 00 <4a> c7 44 38 10 00 00 00 00 4a c7 44 38 18 00 00 00 00 4a c7 44 38 RSP: 0000:ffffc9000ba6f900 EFLAGS: 00000046 RAX: 1ffff9200174df28 RBX: ffff8880b8f367cc RCX: f8f8f8f8f8f8f8f8 RDX: ffffc9000ce2a000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc9000ba6fb88 R08: ffffc9000ba6f6c7 R09: 1ffff9200174ded8 R10: dffffc0000000000 R11: fffff5200174ded9 R12: 0000000000000000 R13: ffffc9000ba6f988 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007fdc82c8c6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c27bac1 CR3: 000000005c81a000 CR4: 00000000003506e0 DR0: 0000000000000006 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_trace_run_bpf_submit+0xf4/0x1c0 kernel/events/core.c:10300 perf_trace_preemptirq_template+0x269/0x330 include/trace/events/preemptirq.h:14 trace_irq_enable+0xbb/0xe0 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:56 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723 RIP: 0010:preempt_schedule_irq+0xba/0x150 kernel/sched/core.c:7010 Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 6f bf 01 00 00 00 e8 51 d6 cd f6 e8 7c e3 fe f6 fb bf 01 00 00 00 f1 b4 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f RSP: 0000:ffffc9000ba6fda0 EFLAGS: 00000286 RAX: c998f32d7f806200 RBX: 0000000000000000 RCX: c998f32d7f806200 RDX: dffffc0000000000 RSI: ffffffff8acac9e0 RDI: 0000000000000001 RBP: ffffc9000ba6fe50 R08: ffffffff8e8b19af R09: 1ffffffff1d16335 R10: dffffc0000000000 R11: fffffbfff1d16336 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200174dfb4 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:692 RIP: 0010:exit_to_user_mode_loop+0x40/0x110 kernel/entry/common.c:164 Code: fb eb 1d e8 d2 a6 12 09 65 48 8b 05 ba dc 8f 7e 4c 8b 30 41 f7 c6 0e 30 02 00 0f 84 c4 00 00 00 e8 f5 ba 19 00 fb 41 f6 c6 08 <74> 05 e8 09 d2 1a 09 41 f7 c6 00 10 00 00 74 08 48 89 df e8 78 a0 RSP: 0000:ffffc9000ba6ff10 EFLAGS: 00000202 RAX: c998f32d7f806200 RBX: ffffc9000ba6ff58 RCX: c998f32d7f806200 RDX: dffffc0000000000 RSI: ffffffff8acac9e0 RDI: ffffffff8b1c8fa0 RBP: 0000000000000000 R08: ffffffff8e8b19af R09: 1ffffffff1d16335 R10: dffffc0000000000 R11: fffffbfff1d16336 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000008 R15: ffff88802d990000 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:315 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723 RIP: 0033:0x7fdc81d9cdd9 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:00007fdc82c8c028 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00007fdc82015fa0 RCX: 00007fdc81d9cdd9 RDX: 00002000000006c0 RSI: 0000000000005452 RDI: 0000000000000003 RBP: 00007fdc81e32d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdc82016038 R14: 00007fdc82015fa0 R15: 00007ffd95baca08