rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=ea5/1/0x4000000000000000 softirq=194444/194445 fqs=5245 (t=10502 jiffies g=370045 q=1856) NMI backtrace for cpu 1 CPU: 1 PID: 14582 Comm: syz-executor.2 Not tainted 5.15.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline] check_cpu_stall kernel/rcu/tree_stall.h:711 [inline] rcu_pending kernel/rcu/tree.c:3880 [inline] rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2599 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:unwind_next_frame+0xcf1/0x1ce0 arch/x86/kernel/unwind_orc.c:540 Code: 28 84 c0 48 8b 4c 24 30 0f 84 33 07 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 4c 8b 64 24 60 48 c1 ea 03 80 3c 02 00 <0f> 85 98 0e 00 00 48 8b 14 24 4d 89 66 38 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc90000dc0148 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 1ffff920001b8031 RCX: ffffffff8de9996b RDX: 1ffff920001b804b RSI: ffffc90000dc0ff0 RDI: ffffc90000dc0ff0 RBP: 0000000000000002 R08: ffffffff8de99966 R09: 0000000000000001 R10: fffff520001b804f R11: 0000000000086089 R12: ffffc90000dc0ff8 R13: ffffc90000dc0255 R14: ffffc90000dc0220 R15: ffffffff8de9996a arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x83/0xb0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3213 [inline] slab_alloc mm/slub.c:3221 [inline] kmem_cache_alloc+0x209/0x390 mm/slub.c:3226 kmem_cache_zalloc include/linux/slab.h:711 [inline] fill_pool+0x264/0x5c0 lib/debugobjects.c:171 __debug_object_init+0x7a/0xd10 lib/debugobjects.c:565 debug_timer_init kernel/time/timer.c:724 [inline] debug_init kernel/time/timer.c:772 [inline] init_timer_key+0x2d/0x340 kernel/time/timer.c:816 neigh_alloc net/core/neighbour.c:417 [inline] ___neigh_create+0x44e/0x26b0 net/core/neighbour.c:583 ip6_finish_output2+0x1089/0x1500 net/ipv6/ip6_output.c:123 __ip6_finish_output net/ipv6/ip6_output.c:191 [inline] __ip6_finish_output+0x4c1/0x1050 net/ipv6/ip6_output.c:170 ip6_finish_output+0x32/0x200 net/ipv6/ip6_output.c:201 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x1e4/0x530 net/ipv6/ip6_output.c:224 dst_output include/net/dst.h:450 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ndisc_send_skb+0xa99/0x17f0 net/ipv6/ndisc.c:508 ndisc_send_rs+0x12e/0x6f0 net/ipv6/ndisc.c:702 addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3893 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__sanitizer_cov_trace_pc+0x50/0x60 kernel/kcov.c:203 Code: 35 8b 82 64 15 00 00 85 c0 74 2b 8b 82 40 15 00 00 83 f8 02 75 20 48 8b 8a 48 15 00 00 8b 92 44 15 00 00 48 8b 01 48 83 c0 01 <48> 39 c2 76 07 48 89 34 c1 48 89 01 c3 0f 1f 00 41 55 41 54 49 89 RSP: 0018:ffffc90018b4f768 EFLAGS: 00000206 RAX: 0000000000003c56 RBX: 0000000000000000 RCX: ffffc9000d45b000 RDX: 0000000000040000 RSI: ffffffff81adc99b RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff888073866ea3 R10: ffffffff81adc3bc R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 000ffffffffff000 R15: ffff888073866ea0 copy_pte_range mm/memory.c:1045 [inline] copy_pmd_range mm/memory.c:1156 [inline] copy_pud_range mm/memory.c:1193 [inline] copy_p4d_range mm/memory.c:1217 [inline] copy_page_range+0x131b/0x4420 mm/memory.c:1290 dup_mmap kernel/fork.c:610 [inline] dup_mm+0xa4e/0x13e0 kernel/fork.c:1453 copy_mm kernel/fork.c:1505 [inline] copy_process+0x6fdf/0x7590 kernel/fork.c:2194 kernel_clone+0xe7/0xac0 kernel/fork.c:2584 __do_sys_clone3+0x1ca/0x2e0 kernel/fork.c:2859 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f34cefc4ae9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f34cc53a188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007f34cf0d7f60 RCX: 00007f34cefc4ae9 RDX: 0000000000000000 RSI: 0000000000000058 RDI: 0000000020000840 RBP: 00007f34cf01ef25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f34cf60bb2f R14: 00007f34cc53a300 R15: 0000000000022000 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 84 c0 test %al,%al 2: 48 8b 4c 24 30 mov 0x30(%rsp),%rcx 7: 0f 84 33 07 00 00 je 0x740 d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 14: fc ff df 17: 48 8b 54 24 08 mov 0x8(%rsp),%rdx 1c: 4c 8b 64 24 60 mov 0x60(%rsp),%r12 21: 48 c1 ea 03 shr $0x3,%rdx 25: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) * 29: 0f 85 98 0e 00 00 jne 0xec7 <-- trapping instruction 2f: 48 8b 14 24 mov (%rsp),%rdx 33: 4d 89 66 38 mov %r12,0x38(%r14) 37: 48 rex.W 38: b8 00 00 00 00 mov $0x0,%eax 3d: 00 fc add %bh,%ah