rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=2aec/1/0x4000000000000000 softirq=18476/18477 fqs=4363 rcu: hardirqs softirqs csw/system rcu: number: 1285957 0 0 rcu: cputime: 16453 36035 65 ==> 52490(ms) rcu: (t=10500 jiffies g=20589 q=1382 ncpus=2) CPU: 1 PID: 7396 Comm: syz.0.429 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:set_pcppage_migratetype mm/page_alloc.c:222 [inline] RIP: 0010:free_unref_page_prepare+0x33f/0x8e0 mm/page_alloc.c:2340 Code: 80 e7 3c 44 89 f9 49 d3 ee 41 83 e6 07 48 83 c3 20 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 04 2c 0c 00 4c 89 33 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 49 ff cf e9 07 RSP: 0018:ffffc900001f0858 EFLAGS: 00000246 RAX: 1ffffd40002ede44 RBX: ffffea000176f220 RCX: 0000000000000b34 RDX: 0000000000000000 RSI: 00000000000000ff RDI: ffffed100bb7a000 RBP: 0000000000000003 R08: dffffc0000000000 R09: 0000000000000000 R10: ffffed100bb79000 R11: fffffbfff21b28b9 R12: dffffc0000000000 R13: 0000000000000008 R14: 0000000000000000 R15: 0000000000000b34 FS: 00007fe9e3cf86c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 000000007e053000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429 napi_frag_unref include/linux/skbuff.h:3507 [inline] skb_release_data+0x49a/0x800 net/core/skbuff.c:985 skb_release_all net/core/skbuff.c:1057 [inline] __kfree_skb+0x57/0x70 net/core/skbuff.c:1071 tcp_write_queue_purge+0x143/0x2f0 net/ipv4/tcp.c:3003 tcp_done_with_error+0x43/0xc0 net/ipv4/tcp_input.c:4446 tcp_write_err net/ipv4/tcp_timer.c:72 [inline] tcp_write_timeout net/ipv4/tcp_timer.c:281 [inline] tcp_retransmit_timer+0x1c69/0x2fe0 net/ipv4/tcp_timer.c:576 tcp_write_timer+0x12a/0x280 net/ipv4/tcp_timer.c:709 call_timer_fn+0x16e/0x530 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x52d/0x7d0 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 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_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:generic_exec_single+0x476/0x4f0 kernel/smp.c:418 Code: 75 11 e8 cd e6 0a 00 48 85 db 75 16 e8 c3 e6 0a 00 eb 15 e8 bc e6 0a 00 e8 47 cd ec 08 48 85 db 74 ea e8 ad e6 0a 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 66 43 c7 44 2c RSP: 0018:ffffc900198afa00 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000080000 RDX: ffffc900051e9000 RSI: 0000000000002a28 RDI: 0000000000002a29 RBP: ffffc900198afad0 R08: ffffffff90d945ff R09: 1ffffffff21b28bf R10: dffffc0000000000 R11: fffffbfff21b28c0 R12: 1ffff92003315f44 R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92003315f65 smp_call_function_single+0x352/0x580 kernel/smp.c:647 task_function_call kernel/events/core.c:120 [inline] perf_install_in_context+0x591/0x8e0 kernel/events/core.c:2948 __do_sys_perf_event_open kernel/events/core.c:12915 [inline] __se_sys_perf_event_open+0x17fa/0x1c20 kernel/events/core.c:12567 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: 0033:0x7fe9e2d8f749 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:00007fe9e3cf8038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fe9e2fe5fa0 RCX: 00007fe9e2d8f749 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000100 RBP: 00007fe9e2e13f91 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe9e2fe6038 R14: 00007fe9e2fe5fa0 R15: 00007ffc172ebd48