rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2667 jiffies s: 29917 root: 0x1/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 11851 Comm: syz.4.2401 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:native_apic_msr_eoi_write+0xb/0x10 arch/x86/include/asm/apic.h:212 Code: 8b 06 bf f0 03 00 00 89 de 5b 41 5e 41 5f ff e0 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b9 0b 08 00 00 31 c0 31 d2 0f 30 0f 1f 40 00 81 ff cf 00 00 00 7f 0c 83 ff 20 74 2a 83 ff 30 74 RSP: 0018:ffffc900000076f8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffffff8c650b30 RCX: 000000000000080b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000b0 RBP: 0000000000000000 R08: ffffffff8fa0b008 R09: ffffffff8fa0b018 R10: ffffffff8fa0b010 R11: ffffffff8fa0b003 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007f5ab4dd46c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6bd93e9e80 CR3: 0000000030d25000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: apic_eoi arch/x86/include/asm/apic.h:399 [inline] ack_APIC_irq arch/x86/include/asm/apic.h:445 [inline] __sysvec_irq_work+0x53/0x350 arch/x86/kernel/irq_work.c:19 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0x4a/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728 RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685 Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 e2 33 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc900000077e0 EFLAGS: 00000206 RAX: 834860341dd6ca00 RBX: 1ffff92000000f04 RCX: 834860341dd6ca00 RDX: dffffc0000000000 RSI: ffffffff8a8c1220 RDI: ffffffff8adf0f60 RBP: ffffc900000078c8 R08: ffffffff90af62ff R09: 1ffffffff215ec5f R10: dffffc0000000000 R11: fffffbfff215ec60 R12: 0000000000000246 R13: dffffc0000000000 R14: ffff8880b8e3b900 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:823 [inline] page_ext_put+0x91/0xb0 mm/page_ext.c:182 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1486 [inline] free_pcp_prepare mm/page_alloc.c:1536 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3508 __skb_frag_unref include/linux/skbuff.h:3491 [inline] skb_release_data+0x499/0x7c0 net/core/skbuff.c:785 skb_release_all net/core/skbuff.c:856 [inline] __kfree_skb+0x4c/0x60 net/core/skbuff.c:870 tcp_write_queue_purge+0x13f/0x2f0 net/ipv4/tcp.c:3122 tcp_done_with_error+0x3f/0xc0 net/ipv4/tcp_input.c:4408 tcp_write_err net/ipv4/tcp_timer.c:70 [inline] tcp_write_timeout net/ipv4/tcp_timer.c:273 [inline] tcp_retransmit_timer+0x1270/0x2790 net/ipv4/tcp_timer.c:547 tcp_write_timer+0x126/0x280 net/ipv4/tcp_timer.c:676 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x53e/0x800 kernel/time/timer.c:2023 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:free_pages_prepare mm/page_alloc.c:1485 [inline] RIP: 0010:free_pcp_prepare mm/page_alloc.c:1536 [inline] RIP: 0010:free_unref_page_prepare+0x24e/0x9a0 mm/page_alloc.c:3413 Code: e8 03 80 3c 28 00 74 08 48 89 df e8 2c 8b 0b 00 48 b8 00 00 00 fc 7f 00 80 ff 48 23 03 48 b9 00 00 00 00 00 f0 7f 00 48 09 c1 <48> 89 0b e9 52 06 00 00 e9 5e 06 00 00 48 b8 00 00 00 00 80 08 05 RSP: 0018:ffffc9000360fac8 EFLAGS: 00000206 RAX: 0080000000000000 RBX: ffffea00014a1400 RCX: 00fff00000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffea00014a1438 RBP: dffffc0000000000 R08: ffffea00014a1437 R09: 1ffffd4000294286 R10: dffffc0000000000 R11: fffff94000294287 R12: 0000000000000000 R13: 0000000000000003 R14: 0000000000000000 R15: ffffea00014a1434 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3508 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] kmem_cache_alloc_node+0x14d/0x320 mm/slub.c:3404 perf_event_alloc+0x154/0x21b0 kernel/events/core.c:11838 __do_sys_perf_event_open kernel/events/core.c:12486 [inline] __se_sys_perf_event_open+0x6fd/0x1ec0 kernel/events/core.c:12378 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5ab3f9c799 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:00007f5ab4dd4028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f5ab4216090 RCX: 00007f5ab3f9c799 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140 RBP: 00007f5ab4032c99 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5ab4216128 R14: 00007f5ab4216090 R15: 00007fffb57816e8