name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 18024 Comm: syz-executor2 Not tainted 4.16.0-rc7+ #372 ============================================ Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 WARNING: possible recursive locking detected 4.16.0-rc7+ #372 Not tainted Call Trace: -------------------------------------------- syz-executor7/18036 is trying to acquire lock: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 ( _xmit_ETHER#2 ){+.-.}, at: [<0000000067f3f5ab>] spin_lock include/linux/spinlock.h:310 [inline] ){+.-.}, at: [<0000000067f3f5ab>] __netif_tx_lock include/linux/netdevice.h:3561 [inline] ){+.-.}, at: [<0000000067f3f5ab>] sch_direct_xmit+0x361/0x1140 net/sched/sch_generic.c:325 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 but task is already holding lock: ( _xmit_ETHER#2 ){+.-.} , at: [<0000000067f3f5ab>] spin_lock include/linux/spinlock.h:310 [inline] , at: [<0000000067f3f5ab>] __netif_tx_lock include/linux/netdevice.h:3561 [inline] , at: [<0000000067f3f5ab>] sch_direct_xmit+0x361/0x1140 net/sched/sch_generic.c:325 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock( _xmit_ETHER#2 ); lock(_xmit_ETHER #2); *** DEADLOCK *** May be due to missing lock nesting notation 11 locks held by syz-executor7/18036: #0: (sk_lock-AF_INET6 ){+.+.}, at: [<00000000968fa333>] lock_sock include/net/sock.h:1464 [inline] ){+.+.}, at: [<00000000968fa333>] sctp_connect+0x23/0xf0 net/sctp/socket.c:4294 should_failslab+0xec/0x120 mm/failslab.c:32 #1: ( slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc_node mm/slab.c:3287 [inline] kmem_cache_alloc_node+0x56/0x760 mm/slab.c:3630 rcu_read_lock){....} __alloc_skb+0xf1/0x780 net/core/skbuff.c:193 , at: [<000000002cb2d6c7>] read_pnet include/net/net_namespace.h:280 [inline] , at: [<000000002cb2d6c7>] sock_net include/net/sock.h:2306 [inline] , at: [<000000002cb2d6c7>] ip_queue_xmit+0x9e/0x1920 net/ipv4/ip_output.c:429 #2: (rcu_read_lock_bh ){....}, at: [<00000000c48206fd>] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] ){....}, at: [<00000000c48206fd>] ip_finish_output2+0x2aa/0x1550 net/ipv4/ip_output.c:213 #3: ( rcu_read_lock_bh){....} , at: [<00000000065d212f>] __dev_queue_xmit+0x2fe/0x2fc0 net/core/dev.c:3491 #4: skb_segment+0x781/0x30a0 net/core/skbuff.c:3610 (rcu_read_lock ){....}, at: [<000000004d8fe5e8>] br_dev_xmit+0x11d/0x1550 net/bridge/br_device.c:43 #5: ( rcu_read_lock_bh){....} , at: [<00000000065d212f>] __dev_queue_xmit+0x2fe/0x2fc0 net/core/dev.c:3491 #6: (_xmit_ETHER #2){+.-.} , at: [<0000000067f3f5ab>] spin_lock include/linux/spinlock.h:310 [inline] , at: [<0000000067f3f5ab>] __netif_tx_lock include/linux/netdevice.h:3561 [inline] , at: [<0000000067f3f5ab>] sch_direct_xmit+0x361/0x1140 net/sched/sch_generic.c:325 #7: (rcu_read_lock_bh ){....}, at: [<00000000c48206fd>] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] ){....}, at: [<00000000c48206fd>] ip_finish_output2+0x2aa/0x1550 net/ipv4/ip_output.c:213 tcp_gso_segment+0x35c/0x16c0 net/ipv4/tcp_offload.c:101 #8: ( rcu_read_lock_bh tcp4_gso_segment+0x192/0x3c0 net/ipv4/tcp_offload.c:54 ){....}, at: [<00000000065d212f>] __dev_queue_xmit+0x2fe/0x2fc0 net/core/dev.c:3491 #9: ( inet_gso_segment+0x61e/0x11e0 net/ipv4/af_inet.c:1305 rcu_read_lock){....} , at: [<000000004d8fe5e8>] br_dev_xmit+0x11d/0x1550 net/bridge/br_device.c:43 #10: skb_mac_gso_segment+0x34e/0x670 net/core/dev.c:2766 (rcu_read_lock_bh ){....}, at: [<00000000065d212f>] __dev_queue_xmit+0x2fe/0x2fc0 net/core/dev.c:3491 stack backtrace: __skb_gso_segment+0x363/0x810 net/core/dev.c:2839 skb_gso_segment include/linux/netdevice.h:4017 [inline] ip_finish_output_gso net/ipv4/ip_output.c:269 [inline] ip_finish_output+0x8a7/0xd60 net/ipv4/ip_output.c:312 NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip_output+0x1d2/0x860 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:443 [inline] ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124 ip_queue_xmit+0x8c0/0x1920 net/ipv4/ip_output.c:504 tcp_transmit_skb+0x1b12/0x3960 net/ipv4/tcp_output.c:1176 tcp_write_xmit+0x689/0x5470 net/ipv4/tcp_output.c:2394 __tcp_push_pending_frames+0xa0/0x250 net/ipv4/tcp_output.c:2567 tcp_push+0x547/0x780 net/ipv4/tcp.c:726 tcp_sendmsg_locked+0x289a/0x3c70 net/ipv4/tcp.c:1426 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1463 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 SYSC_sendto+0x361/0x5c0 net/socket.c:1747 SyS_sendto+0x40/0x50 net/socket.c:1715 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x454e79 RSP: 002b:00007fcc764cac68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fcc764cb6d4 RCX: 0000000000454e79 RDX: 0000000000000fff RSI: 00000000200003c0 RDI: 0000000000000018 RBP: 000000000072bea0 R08: 00000000200002c0 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000019 R13: 00000000000004f2 R14: 00000000006f9750 R15: 0000000000000003 CPU: 1 PID: 18036 Comm: syz-executor7 Not tainted 4.16.0-rc7+ #372 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+0x194/0x24d lib/dump_stack.c:53 print_deadlock_bug kernel/locking/lockdep.c:1761 [inline] check_deadlock kernel/locking/lockdep.c:1805 [inline] validate_chain kernel/locking/lockdep.c:2401 [inline] __lock_acquire+0xe8f/0x3e00 kernel/locking/lockdep.c:3431 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:310 [inline] __netif_tx_lock include/linux/netdevice.h:3561 [inline] sch_direct_xmit+0x361/0x1140 net/sched/sch_generic.c:325 qdisc_restart net/sched/sch_generic.c:393 [inline] __qdisc_run+0x57d/0x18e0 net/sched/sch_generic.c:401 __dev_xmit_skb net/core/dev.c:3217 [inline] __dev_queue_xmit+0xb8b/0x2fc0 net/core/dev.c:3525 dev_queue_xmit+0x17/0x20 net/core/dev.c:3590 br_dev_queue_push_xmit+0x196/0x5a0 net/bridge/br_forward.c:55 NF_HOOK include/linux/netfilter.h:288 [inline] br_forward_finish+0xc8/0x530 net/bridge/br_forward.c:67 NF_HOOK include/linux/netfilter.h:288 [inline] __br_forward+0x533/0xc80 net/bridge/br_forward.c:112 br_flood+0x665/0x770 net/bridge/br_forward.c:225 br_dev_xmit+0xa68/0x1550 net/bridge/br_device.c:87 __netdev_start_xmit include/linux/netdevice.h:4066 [inline] netdev_start_xmit include/linux/netdevice.h:4075 [inline] xmit_one net/core/dev.c:3026 [inline] dev_hard_start_xmit+0x24e/0xac0 net/core/dev.c:3042 __dev_queue_xmit+0x26bf/0x2fc0 net/core/dev.c:3557 dev_queue_xmit+0x17/0x20 net/core/dev.c:3590 neigh_hh_output include/net/neighbour.h:472 [inline] neigh_output include/net/neighbour.h:480 [inline] ip_finish_output2+0xf4d/0x1550 net/ipv4/ip_output.c:229 ip_finish_output+0x864/0xd60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip_mc_output+0x271/0x1350 net/ipv4/ip_output.c:390 dst_output include/net/dst.h:443 [inline] ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124 iptunnel_xmit+0x556/0x810 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0x177b/0x3550 net/ipv4/ip_tunnel.c:785 __gre_xmit+0x546/0x8b0 net/ipv4/ip_gre.c:449 erspan_xmit+0x779/0x22a0 net/ipv4/ip_gre.c:728 __netdev_start_xmit include/linux/netdevice.h:4066 [inline] netdev_start_xmit include/linux/netdevice.h:4075 [inline] xmit_one net/core/dev.c:3026 [inline] dev_hard_start_xmit+0x24e/0xac0 net/core/dev.c:3042 sch_direct_xmit+0x40d/0x1140 net/sched/sch_generic.c:327 qdisc_restart net/sched/sch_generic.c:393 [inline] __qdisc_run+0x57d/0x18e0 net/sched/sch_generic.c:401 __dev_xmit_skb net/core/dev.c:3217 [inline] __dev_queue_xmit+0xb8b/0x2fc0 net/core/dev.c:3525 dev_queue_xmit+0x17/0x20 net/core/dev.c:3590 br_dev_queue_push_xmit+0x196/0x5a0 net/bridge/br_forward.c:55 NF_HOOK include/linux/netfilter.h:288 [inline] br_forward_finish+0xc8/0x530 net/bridge/br_forward.c:67 NF_HOOK include/linux/netfilter.h:288 [inline] __br_forward+0x533/0xc80 net/bridge/br_forward.c:112 br_flood+0x665/0x770 net/bridge/br_forward.c:225 br_dev_xmit+0xa68/0x1550 net/bridge/br_device.c:87 __netdev_start_xmit include/linux/netdevice.h:4066 [inline] netdev_start_xmit include/linux/netdevice.h:4075 [inline] xmit_one net/core/dev.c:3026 [inline] dev_hard_start_xmit+0x24e/0xac0 net/core/dev.c:3042 __dev_queue_xmit+0x26bf/0x2fc0 net/core/dev.c:3557 dev_queue_xmit+0x17/0x20 net/core/dev.c:3590 neigh_resolve_output+0x5e2/0xa00 net/core/neighbour.c:1350 neigh_output include/net/neighbour.h:482 [inline] ip_finish_output2+0x91a/0x1550 net/ipv4/ip_output.c:229 ip_finish_output+0x864/0xd60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip_mc_output+0x271/0x1350 net/ipv4/ip_output.c:390 dst_output include/net/dst.h:443 [inline] ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124 ip_queue_xmit+0x8c0/0x1920 net/ipv4/ip_output.c:504 sctp_v4_xmit+0x108/0x140 net/sctp/protocol.c:992 sctp_packet_transmit+0x225e/0x3750 net/sctp/output.c:638 sctp_outq_flush+0xabb/0x4060 net/sctp/outqueue.c:911 sctp_outq_uncork+0x5a/0x70 net/sctp/outqueue.c:776 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1807 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1210 [inline] sctp_do_sm+0x4e0/0x6ed0 net/sctp/sm_sideeffect.c:1181 sctp_primitive_ASSOCIATE+0x9d/0xd0 net/sctp/primitive.c:88 __sctp_connect+0x829/0xca0 net/sctp/socket.c:1235 sctp_connect+0xb4/0xf0 net/sctp/socket.c:4307 inet_dgram_connect+0x16b/0x1f0 net/ipv4/af_inet.c:542 SYSC_connect+0x213/0x4a0 net/socket.c:1639 SyS_connect+0x24/0x30 net/socket.c:1620 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x454e79 RSP: 002b:00007ff8e2fb5c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007ff8e2fb66d4 RCX: 0000000000454e79 RDX: 000000000000001c RSI: 00000000200000c0 RDI: 0000000000000016 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000005a R14: 00000000006f2910 R15: 0000000000000000