IPv4: Oversized IP packet from 127.0.0.1 =============================== [ INFO: suspicious RCU usage. ] 4.9.100-ge14d1a3 #30 Not tainted ------------------------------- kernel/rcu/tree_plugin.h:672 Illegal synchronize_rcu() in RCU read-side critical section! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 0 3 locks held by syz-executor2/3869: #0: (tasklist_lock){.+.?..}, at: [] do_wait+0x392/0x950 kernel/exit.c:1562 #1: (rcu_read_lock){......}, at: [] INIT_LIST_HEAD include/linux/list.h:28 [inline] #1: (rcu_read_lock){......}, at: [] avc_compute_av+0xb0/0x610 security/selinux/avc.c:975 #2: (rcu_callback){......}, at: [] __rcu_reclaim kernel/rcu/rcu.h:108 [inline] #2: (rcu_callback){......}, at: [] rcu_do_batch kernel/rcu/tree.c:2789 [inline] #2: (rcu_callback){......}, at: [] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline] #2: (rcu_callback){......}, at: [] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline] #2: (rcu_callback){......}, at: [] rcu_process_callbacks+0x98e/0x12b0 kernel/rcu/tree.c:3037 stack backtrace: CPU: 1 PID: 3869 Comm: syz-executor2 Not tainted 4.9.100-ge14d1a3 #30 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801db307d60 ffffffff81eb0f09 ffff8801a63f8000 0000000000000000 0000000000000002 ffffffff83c6da00 ffff8801da1183d8 ffff8801db307d90 ffffffff81423f09 ffff8801da118280 ffff8801d8eacc48 ffff8801d8eac448 Call Trace: [ 1701.589189] [] __dump_stack lib/dump_stack.c:15 [inline] [ 1701.589189] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] lockdep_rcu_suspicious.cold.48+0x110/0x141 kernel/locking/lockdep.c:4455 [] synchronize_rcu+0x68/0x90 kernel/rcu/tree_plugin.h:669 [] __l2tp_session_unhash+0x38a/0x520 net/l2tp/l2tp_core.c:1796 [] l2tp_tunnel_closeall+0x1f7/0x350 net/l2tp/l2tp_core.c:1364 [] l2tp_tunnel_destruct+0x2f2/0x590 net/l2tp/l2tp_core.c:1324 [] __sk_destruct+0x55/0x590 net/core/sock.c:1428 [] __rcu_reclaim kernel/rcu/rcu.h:118 [inline] [] rcu_do_batch kernel/rcu/tree.c:2789 [inline] [] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline] [] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline] [] rcu_process_callbacks+0x8ae/0x12b0 kernel/rcu/tree.c:3037 [] __do_softirq+0x20b/0x937 kernel/softirq.c:284 [] invoke_softirq kernel/softirq.c:364 [inline] [] irq_exit+0x147/0x190 kernel/softirq.c:405 [] exiting_irq arch/x86/include/asm/apic.h:659 [inline] [] smp_apic_timer_interrupt+0x81/0xa0 arch/x86/kernel/apic/apic.c:960 [] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648 [ 1701.703201] [] ? arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline] [ 1701.703201] [] ? __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:162 [inline] [ 1701.703201] [] ? _raw_spin_unlock_irqrestore+0x5f/0x70 kernel/locking/spinlock.c:191 [] spin_unlock_irqrestore include/linux/spinlock.h:362 [inline] [] avc_reclaim_node security/selinux/avc.c:543 [inline] [] avc_alloc_node+0x289/0x3d0 security/selinux/avc.c:561 [] avc_insert security/selinux/avc.c:672 [inline] [] avc_compute_av+0x178/0x610 security/selinux/avc.c:978 [] avc_has_perm_noaudit security/selinux/avc.c:1114 [inline] [] avc_has_perm+0x364/0x4f0 security/selinux/avc.c:1148 [] task_has_perm+0x1fc/0x330 security/selinux/hooks.c:1615 [] selinux_task_wait+0x23/0x30 security/selinux/hooks.c:3954 [] security_task_wait+0x73/0xb0 security/security.c:1032 [] wait_consider_task+0x2a1/0x3630 kernel/exit.c:1381 [] do_wait_thread kernel/exit.c:1494 [inline] [] do_wait+0x423/0x950 kernel/exit.c:1565 [] SYSC_wait4 kernel/exit.c:1693 [inline] [] SyS_wait4+0x119/0x1d0 kernel/exit.c:1662 [] C_SYSC_wait4+0x237/0x280 kernel/compat.c:543 [] compat_SyS_wait4+0x2c/0x40 kernel/compat.c:536 [] sys32_waitpid+0x25/0x30 arch/x86/ia32/sys_ia32.c:172 [] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline] [] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387 [] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 ODEBUG: object ffff8801db307ce8 is NOT on stack ffff8801a5c00000, but annotated ------------[ cut here ]------------ WARNING: CPU: 1 PID: 3869 at lib/debugobjects.c:303 debug_object_is_on_stack lib/debugobjects.c:303 [inline] WARNING: CPU: 1 PID: 3869 at lib/debugobjects.c:303 __debug_object_init.cold.10+0x6b/0x2b0 lib/debugobjects.c:329