rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (1 GPs behind) idle=0bb/1/0x4000000000000002 softirq=6372/6373 fqs=5248 (detected by 1, t=10502 jiffies, g=7033, q=1719) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4369 Comm: syz.0.21 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:native_apic_msr_eoi_write+0xb/0x10 arch/x86/include/asm/apic.h:214 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:ffffc900000076a0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffffff8be649c8 RCX: 000000000000080b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000b0 RBP: 0000000000000000 R08: ffffffff8ff3c008 R09: ffffffff8ff3c018 R10: ffffffff8ff3c010 R11: ffffffff8ff3c003 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fdd1b27b6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001040 CR3: 000000005c55b000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: apic_eoi arch/x86/include/asm/apic.h:400 [inline] ack_APIC_irq arch/x86/include/asm/apic.h:446 [inline] __sysvec_irq_work+0x51/0x240 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:713 RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674 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 d2 f6 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08 RSP: 0018:ffffc90000007780 EFLAGS: 00000206 RAX: 3090c3d67a3b4700 RBX: 1ffff92000000ef4 RCX: 3090c3d67a3b4700 RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffffffff8a7a5100 RBP: ffffc90000007860 R08: ffffffff910471c7 R09: 1ffffffff2208e38 R10: dffffc0000000000 R11: fffffbfff2208e39 R12: ffffffff8d123400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] ndisc_send_skb+0xd3b/0x1410 net/ipv6/ndisc.c:521 addrconf_rs_timer+0x367/0x640 net/ipv6/addrconf.c:3974 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648 expire_timers kernel/time/timer.c:1699 [inline] __run_timers+0x56c/0x810 kernel/time/timer.c:1970 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983 handle_softirqs+0x336/0x830 kernel/softirq.c:576 __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:unwind_get_return_address+0x64/0x80 arch/x86/kernel/unwind_orc.c:324 Code: 89 df e8 5f 58 89 00 48 8b 3b e8 37 a7 1a 00 85 c0 74 14 43 80 3c 37 00 74 08 48 89 df e8 44 58 89 00 48 8b 03 eb 02 31 c0 5b <41> 5e 41 5f c3 89 d9 80 e1 07 80 c1 03 38 c1 7c ad 48 89 df e8 13 RSP: 0018:ffffc9000332f830 EFLAGS: 00000246 RAX: ffffffff87e55d43 RBX: ffffc9000332f900 RCX: 0000000080000001 RDX: ffffc9000332f801 RSI: ffffc9000332fe28 RDI: ffffffff87e55d43 RBP: ffffc9000332f8d0 R08: ffffc9000332fe28 R09: ffffc9000332f898 R10: dffffc0000000000 R11: fffff52000665f15 R12: ffff88802af6d940 R13: ffff88814cd20780 R14: dffffc0000000000 R15: 1ffff92000665f12 arch_stack_walk+0xf2/0x140 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x92/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x15d/0x280 mm/slub.c:3238 sk_prot_alloc+0x57/0x210 net/core/sock.c:1859 sk_alloc+0x2f/0x310 net/core/sock.c:1921 tipc_sk_create+0xde/0x24e0 net/tipc/socket.c:488 __sock_create+0x473/0x910 net/socket.c:1496 sock_create net/socket.c:1552 [inline] __sys_socket+0xe2/0x170 net/socket.c:1594 __do_sys_socket net/socket.c:1603 [inline] __se_sys_socket net/socket.c:1601 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1601 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: 0033:0x7fdd1d024559 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:00007fdd1b27b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007fdd1d2aafa0 RCX: 00007fdd1d024559 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 000000000000001e RBP: 00007fdd1d0bbb20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdd1d2ab038 R14: 00007fdd1d2aafa0 R15: 00007ffca80a0698