rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (9664 ticks this GP) idle=7f6/1/0x4000000000000000 softirq=12941/12941 fqs=5175 (t=10500 jiffies g=13201 q=1054) NMI backtrace for cpu 0 CPU: 0 PID: 10792 Comm: syz-executor.1 Not tainted 5.10.0-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:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline] check_cpu_stall kernel/rcu/tree_stall.h:637 [inline] rcu_pending kernel/rcu/tree.c:3694 [inline] rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567 update_process_times+0x77/0xd0 kernel/time/timer.c:1709 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:kfree_skbmem+0xe7/0x1b0 net/core/skbuff.c:622 Code: af 77 83 fa 31 ff 89 de e8 f6 6f 83 fa 85 db 0f 84 a4 00 00 00 5b 5d 41 5c e9 95 77 83 fa e8 90 77 83 fa 48 8b 3d 19 b7 f7 03 <48> 89 ee e8 d1 ad c4 fa 5b 5d 41 5c e9 78 77 83 fa e8 73 77 83 fa RSP: 0018:ffffc90000007a90 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff86ec8c50 RDX: ffff88801ea41a40 RSI: ffffffff86ec8ce0 RDI: ffff8881406f3c80 RBP: ffff88802224b140 R08: 0000000000000001 R09: ffffffff8ebaf787 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: ffff888022038ac0 R14: ffff8881416ef000 R15: ffff888022038af0 __kfree_skb net/core/skbuff.c:679 [inline] kfree_skb net/core/skbuff.c:696 [inline] kfree_skb+0x140/0x3f0 net/core/skbuff.c:690 kfree_skb_list net/core/skbuff.c:705 [inline] skb_release_data+0x3ff/0x910 net/core/skbuff.c:607 skb_release_all net/core/skbuff.c:664 [inline] __kfree_skb net/core/skbuff.c:678 [inline] consume_skb net/core/skbuff.c:834 [inline] consume_skb+0xc2/0x160 net/core/skbuff.c:828 netlink_broadcast_filtered+0x35c/0xdc0 net/netlink/af_netlink.c:1514 netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1536 nlmsg_multicast include/net/netlink.h:1033 [inline] xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1116 [inline] xfrm_notify_sa_flush net/xfrm/xfrm_user.c:2858 [inline] xfrm_send_state_notify+0x91f/0x1ca0 net/xfrm/xfrm_user.c:2977 km_state_notify+0xbf/0x1e0 net/xfrm/xfrm_state.c:2174 km_state_expired net/xfrm/xfrm_state.c:2188 [inline] xfrm_timer_handler+0x844/0xbf0 net/xfrm/xfrm_state.c:600 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x693/0xea0 kernel/time/hrtimer.c:1583 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:debug_lockdep_rcu_enabled+0x23/0x30 kernel/rcu/update.c:278 Code: cc cc cc cc cc cc cc 8b 05 4a 14 07 04 85 c0 74 21 8b 05 1c 45 07 04 85 c0 74 17 65 48 8b 04 25 00 f0 01 00 8b 80 14 09 00 00 <85> c0 0f 94 c0 0f b6 c0 c3 cc cc cc cc 55 53 48 c7 c3 40 57 03 00 RSP: 0018:ffffc90018cc7690 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 1ffff92003198ed5 RCX: ffffffff81562ca8 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8cecae48 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8cecae4f R10: fffffbfff19d95c9 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888025a94618 R14: 0000000000000000 R15: 0000000000000000 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x2df/0x740 kernel/locking/lockdep.c:5408 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] zap_pte_range mm/memory.c:1211 [inline] zap_pmd_range mm/memory.c:1357 [inline] zap_pud_range mm/memory.c:1386 [inline] zap_p4d_range mm/memory.c:1407 [inline] unmap_page_range+0x7fe/0x2640 mm/memory.c:1428 unmap_single_vma+0x198/0x300 mm/memory.c:1473 unmap_vmas+0x168/0x2e0 mm/memory.c:1505 exit_mmap+0x2b1/0x530 mm/mmap.c:3220 __mmput+0x122/0x470 kernel/fork.c:1079 mmput+0x53/0x60 kernel/fork.c:1100 exit_mm kernel/exit.c:486 [inline] do_exit+0xa72/0x29b0 kernel/exit.c:796 do_group_exit+0x125/0x310 kernel/exit.c:906 get_signal+0x42a/0x1f10 kernel/signal.c:2758 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e159 Code: Unable to access opcode bytes at RIP 0x45e12f. RSP: 002b:00007f421deeac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: 0000000020ffc000 RBX: 0000000000000006 RCX: 000000000045e159 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffc000 RBP: 000000000119c080 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffc4c0865af R14: 00007f421deeb9c0 R15: 000000000119c034