audit: type=1400 audit(1519089876.337:8): avc: denied { map } for pid=4120 comm="syz-execprog" path="/root/syzkaller-shm244545395" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:file_t:s0 tclass=file permissive=1 IPVS: ftp: loaded support on port[0] = 21 IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready ===================================== WARNING: bad unlock balance detected! 4.16.0-rc1+ #232 Not tainted ------------------------------------- syz-executor0/4127 is trying to release lock (rcu_read_lock_bh) at: [] rcu_read_unlock_bh include/linux/rcupdate.h:722 [inline] [] hashlimit_mt_common.isra.10+0x1beb/0x2610 net/netfilter/xt_hashlimit.c:777 but there are no more locks to release! other info that might help us debug this: 3 locks held by syz-executor0/4127: #0: ((&idev->mc_ifc_timer)){+.-.}, at: [<000000006860bd74>] lockdep_copy_map include/linux/lockdep.h:178 [inline] #0: ((&idev->mc_ifc_timer)){+.-.}, at: [<000000006860bd74>] call_timer_fn+0x1c6/0x820 kernel/time/timer.c:1316 #1: (rcu_read_lock){....}, at: [<00000000fd67366e>] read_pnet include/net/net_namespace.h:280 [inline] #1: (rcu_read_lock){....}, at: [<00000000fd67366e>] dev_net include/linux/netdevice.h:2056 [inline] #1: (rcu_read_lock){....}, at: [<00000000fd67366e>] mld_sendpack+0x180/0xe70 net/ipv6/mcast.c:1625 #2: (rcu_read_lock){....}, at: [<000000002f7c945e>] nf_hook.constprop.37+0x0/0x830 net/ipv6/mcast.c:2795 stack backtrace: CPU: 0 PID: 4127 Comm: syz-executor0 Not tainted 4.16.0-rc1+ #232 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_unlock_imbalance_bug+0x12f/0x140 kernel/locking/lockdep.c:3484 __lock_release kernel/locking/lockdep.c:3691 [inline] lock_release+0x6fe/0xa40 kernel/locking/lockdep.c:3939 rcu_lock_release include/linux/rcupdate.h:249 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:724 [inline] hashlimit_mt_common.isra.10+0x1c08/0x2610 net/netfilter/xt_hashlimit.c:777 hashlimit_mt+0x78/0x90 net/netfilter/xt_hashlimit.c:846 ip6t_do_table+0x98d/0x1a30 net/ipv6/netfilter/ip6_tables.c:319 ip6table_raw_hook+0x65/0x80 net/ipv6/netfilter/ip6table_raw.c:42 nf_hook_entry_hookfn include/linux/netfilter.h:120 [inline] nf_hook_slow+0xba/0x1a0 net/netfilter/core.c:483 nf_hook.constprop.37+0x3f6/0x830 include/linux/netfilter.h:243 NF_HOOK include/linux/netfilter.h:286 [inline] mld_sendpack+0x6c2/0xe70 net/ipv6/mcast.c:1658 mld_send_cr net/ipv6/mcast.c:1954 [inline] mld_ifc_timer_expire+0x3d9/0x770 net/ipv6/mcast.c:2451 call_timer_fn+0x228/0x820 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0x7ee/0xb70 kernel/time/timer.c:1666 run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 invoke_softirq kernel/softirq.c:365 [inline] irq_exit+0x1cc/0x200 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:541 [inline] smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline] RIP: 0010:lock_release+0x503/0xa40 kernel/locking/lockdep.c:3942 RSP: 0018:ffff8801ba25f2b0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff12 RAX: dffffc0000000000 RBX: ffff8801b4428380 RCX: 1ffff1003688517d RDX: 1ffffffff0d592cd RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffff8801ba25f3e0 R08: 0000000000000000 R09: 1ffff1003744be5f R10: ffff8801ba25f2c0 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8801b4428380 R14: ffff8801ba25f2f8 R15: 1ffff1003744be5b rcu_lock_release include/linux/rcupdate.h:249 [inline] rcu_read_unlock include/linux/rcupdate.h:686 [inline] __is_insn_slot_addr+0x225/0x330 kernel/kprobes.c:301 is_kprobe_optinsn_slot include/linux/kprobes.h:344 [inline] kernel_text_address+0x11b/0x140 kernel/extable.c:150 __kernel_text_address+0xd/0x40 kernel/extable.c:107 unwind_get_return_address+0x61/0xa0 arch/x86/kernel/unwind_frame.c:18 __save_stack_trace+0x7e/0xd0 arch/x86/kernel/stacktrace.c:45 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552 kmem_cache_alloc_node_trace+0x150/0x760 mm/slab.c:3650 kmalloc_node include/linux/slab.h:550 [inline] kzalloc_node include/linux/slab.h:712 [inline] __get_vm_area_node+0xae/0x340 mm/vmalloc.c:1402 __vmalloc_node_range+0xa3/0x650 mm/vmalloc.c:1754 __vmalloc_node mm/vmalloc.c:1804 [inline] __vmalloc_node_flags mm/vmalloc.c:1818 [inline] vzalloc+0x45/0x50 mm/vmalloc.c:1857 __do_replace+0xc2/0xa70 net/ipv6/netfilter/ip6_tables.c:1074 do_replace net/ipv6/netfilter/ip6_tables.c:1164 [inline] do_ip6t_set_ctl+0x40f/0x5f0 net/ipv6/netfilter/ip6_tables.c:1686 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0x10b/0x130 net/ipv6/ipv6_sockglue.c:927 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2979 SYSC_setsockopt net/socket.c:1850 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1829 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x26/0x9b RIP: 0033:0x45689a RSP: 002b:00007fff9c7eab38 EFLAGS: 00000202 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fff9c7eab60 RCX: 000000000045689a RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 00000000006fd6c0 R08: 00000000000002e8 R09: 0000000000004000 R10: 00000000006fc8e0 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000003 R14: 0000000000000029 R15: 00000000006fc940