rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10424 ticks this GP) idle=1334/1/0x4000000000000000 softirq=44974/44974 fqs=3314 rcu: hardirqs softirqs csw/system rcu: number: 1328364 0 0 rcu: cputime: 15342 37137 69 ==> 52480(ms) rcu: (t=10500 jiffies g=64857 q=727 ncpus=2) CPU: 1 PID: 12635 Comm: syz.2.1940 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 kernel/locking/spinlock.c:194 Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 eb 98 cb f6 65 8b 05 7c c0 72 75 85 c0 74 3c 48 c7 04 24 0e 36 RSP: 0018:ffffc900001ef7a0 EFLAGS: 00000206 RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: 1924c9ab67961500 RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: 0000000000000001 RBP: ffffc900001ef838 R08: ffffffff911c95cf R09: 1ffffffff22392b9 R10: dffffc0000000000 R11: fffffbfff22392ba R12: dffffc0000000000 R13: ffff88805baffd80 R14: ffffffff8d7f0340 R15: 1ffff9200003def4 FS: 00007f589c3f66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 0000000077a47000 CR4: 00000000003506e0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __stack_depot_save+0x560/0x630 lib/stackdepot.c:439 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_set_track+0x5f/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] kmem_cache_alloc_node+0x14c/0x320 mm/slub.c:3540 __alloc_skb+0x103/0x2c0 net/core/skbuff.c:643 alloc_skb include/linux/skbuff.h:1316 [inline] __tcp_send_ack+0xa1/0x5a0 net/ipv4/tcp_output.c:4113 tcp_validate_incoming+0xf13/0x2250 net/ipv4/tcp_input.c:5901 tcp_rcv_established+0x7de/0x1d20 net/ipv4/tcp_input.c:6166 tcp_v4_do_rcv+0x4ed/0xb80 net/ipv4/tcp_ipv4.c:1735 tcp_v4_rcv+0x23bf/0x2af0 net/ipv4/tcp_ipv4.c:2167 ip_protocol_deliver_rcu+0x20e/0x3f0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2ca/0x510 net/ipv4/ip_input.c:233 NF_HOOK+0x32d/0x3b0 include/linux/netfilter.h:304 dst_input include/net/dst.h:477 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline] ip_sublist_rcv+0xa4c/0xd70 net/ipv4/ip_input.c:639 ip_list_rcv+0x3f2/0x440 net/ipv4/ip_input.c:674 __netif_receive_skb_list_ptype net/core/dev.c:5689 [inline] __netif_receive_skb_list_core+0x583/0x750 net/core/dev.c:5737 __netif_receive_skb_list net/core/dev.c:5789 [inline] netif_receive_skb_list_internal+0x943/0xca0 net/core/dev.c:5880 gro_normal_list include/net/gro.h:451 [inline] gro_normal_one include/net/gro.h:464 [inline] napi_gro_complete+0x2db/0x6f0 net/core/gro.c:266 dev_gro_receive+0x19cd/0x22c0 net/core/gro.c:504 napi_gro_receive+0x381/0xb00 net/core/gro.c:607 receive_buf+0x2203/0x3820 drivers/net/virtio_net.c:1870 virtnet_receive drivers/net/virtio_net.c:2155 [inline] virtnet_poll+0x5dd/0x1280 drivers/net/virtio_net.c:2229 __napi_poll+0xc0/0x460 net/core/dev.c:6650 napi_poll net/core/dev.c:6717 [inline] net_rx_action+0x616/0xc40 net/core/dev.c:6853 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+0xd3/0x190 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: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 61 fb cc f6 e8 2c 0d 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: 0018:ffffc90019e8f880 EFLAGS: 00000282 RAX: 1924c9ab67961500 RBX: 0000000000000000 RCX: 1924c9ab67961500 RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: 0000000000000001 RBP: ffffc90019e8f920 R08: ffffffff911c95ff R09: 1ffffffff22392bf R10: dffffc0000000000 R11: fffffbfff22392c0 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920033d1f10 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:preempt_schedule_common+0xb8/0xc0 kernel/sched/core.c:6876 Code: 74 75 65 48 8b 1d 78 26 74 75 48 89 d8 48 c1 e8 03 42 80 3c 38 00 0f 84 67 ff ff ff 48 89 df e8 de db 4f f7 e9 5a ff ff ff 5b <41> 5e 41 5f c3 0f 1f 00 f3 0f 1e fa 55 48 89 e5 41 57 41 56 53 48 RSP: 0018:ffffc90019e8f9e8 EFLAGS: 00000246 RAX: 1ffff110052b7780 RBX: 1ffff920033d1f40 RCX: 1924c9ab67961500 RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffff8880295bd1f8 RBP: ffffc90019e8fa78 R08: ffffffff911c95ff R09: 1ffffffff22392bf R10: dffffc0000000000 R11: fffffbfff22392c0 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880295bd0c8 R15: dffffc0000000000 preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45 smp_call_function_single+0x48d/0x5a0 kernel/smp.c:652 task_function_call kernel/events/core.c:120 [inline] perf_install_in_context+0x5be/0x920 kernel/events/core.c:2959 __do_sys_perf_event_open kernel/events/core.c:12957 [inline] __se_sys_perf_event_open+0x1836/0x1c50 kernel/events/core.c:12609 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f589e19ce59 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:00007f589c3f6028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f589e415fa0 RCX: 00007f589e19ce59 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480 RBP: 00007f589e232d6f R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f589e416038 R14: 00007f589e415fa0 R15: 00007ffe88298da8